Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.361
1.361 ! djm 1: /* $OpenBSD: clientloop.c,v 1.360 2021/04/30 04:29:53 djm Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
1.152 stevesk 62:
1.175 deraadt 63: #include <sys/types.h>
1.152 stevesk 64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/stat.h>
1.166 stevesk 66: #include <sys/socket.h>
1.171 stevesk 67: #include <sys/time.h>
1.189 djm 68: #include <sys/queue.h>
1.150 stevesk 69:
1.155 stevesk 70: #include <ctype.h>
1.168 stevesk 71: #include <errno.h>
1.151 stevesk 72: #include <paths.h>
1.153 stevesk 73: #include <signal.h>
1.174 stevesk 74: #include <stdio.h>
1.173 stevesk 75: #include <stdlib.h>
1.170 stevesk 76: #include <string.h>
1.328 deraadt 77: #include <stdarg.h>
1.150 stevesk 78: #include <termios.h>
1.175 deraadt 79: #include <pwd.h>
1.169 stevesk 80: #include <unistd.h>
1.266 deraadt 81: #include <limits.h>
1.1 deraadt 82:
1.175 deraadt 83: #include "xmalloc.h"
1.45 markus 84: #include "ssh.h"
85: #include "ssh2.h"
1.1 deraadt 86: #include "packet.h"
1.315 markus 87: #include "sshbuf.h"
1.15 markus 88: #include "compat.h"
1.74 markus 89: #include "channels.h"
1.15 markus 90: #include "dispatch.h"
1.317 markus 91: #include "sshkey.h"
1.175 deraadt 92: #include "cipher.h"
1.54 markus 93: #include "kex.h"
1.275 markus 94: #include "myproposal.h"
1.45 markus 95: #include "log.h"
1.261 millert 96: #include "misc.h"
1.45 markus 97: #include "readconf.h"
98: #include "clientloop.h"
1.147 djm 99: #include "sshconnect.h"
1.40 markus 100: #include "authfd.h"
1.45 markus 101: #include "atomicio.h"
1.118 deraadt 102: #include "sshpty.h"
1.123 djm 103: #include "match.h"
104: #include "msg.h"
1.262 djm 105: #include "ssherr.h"
1.267 djm 106: #include "hostfile.h"
1.319 djm 107:
1.39 markus 108: /* import options */
109: extern Options options;
110:
1.1 deraadt 111: /* Flag indicating that stdin should be redirected from /dev/null. */
112: extern int stdin_null_flag;
113:
1.116 dtucker 114: /* Flag indicating that no shell has been requested */
115: extern int no_shell_flag;
116:
1.286 djm 117: /* Flag indicating that ssh should daemonise after authentication is complete */
118: extern int fork_after_authentication_flag;
119:
1.123 djm 120: /* Control socket */
1.217 djm 121: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 122:
1.13 markus 123: /*
124: * Name of the host we are connecting to. This is the name given on the
1.324 jmc 125: * command line, or the Hostname specified for the user-supplied name in a
1.13 markus 126: * configuration file.
127: */
1.1 deraadt 128: extern char *host;
129:
1.13 markus 130: /*
1.330 djm 131: * If this field is not NULL, the ForwardAgent socket is this path and different
132: * instead of SSH_AUTH_SOCK.
133: */
134: extern char *forward_agent_sock_path;
135:
136: /*
1.13 markus 137: * Flag to indicate that we have received a window change signal which has
138: * not yet been processed. This will cause a message indicating the new
139: * window size to be sent to the server a little later. This is volatile
140: * because this is updated in a signal handler.
141: */
1.88 markus 142: static volatile sig_atomic_t received_window_change_signal = 0;
143: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 144:
1.222 djm 145: /* Time when backgrounded control master using ControlPersist should exit */
146: static time_t control_persist_exit_time = 0;
147:
1.1 deraadt 148: /* Common data for the client loop code. */
1.217 djm 149: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.11 markus 150: static int last_was_cr; /* Last character was a newline. */
1.197 djm 151: static int exit_status; /* Used to store the command exit status. */
1.315 markus 152: static struct sshbuf *stderr_buffer; /* Used for final exit message. */
1.11 markus 153: static int connection_in; /* Connection to server (input). */
154: static int connection_out; /* Connection to server (output). */
1.56 markus 155: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 156: static int session_closed; /* In SSH2: login session closed. */
1.274 djm 157: static u_int x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.345 dtucker 158: static time_t server_alive_time; /* Time to do server_alive_check */
1.1 deraadt 159:
1.321 djm 160: static void client_init_dispatch(struct ssh *ssh);
1.16 markus 161: int session_ident = -1;
162:
1.195 djm 163: /* Track escape per proto2 channel */
164: struct escape_filter_ctx {
165: int escape_pending;
166: int escape_char;
167: };
168:
169: /* Context for channel confirmation replies */
1.190 djm 170: struct channel_reply_ctx {
171: const char *request_type;
1.234 djm 172: int id;
173: enum confirm_action action;
1.190 djm 174: };
175:
1.196 djm 176: /* Global request success/failure callbacks */
1.303 djm 177: /* XXX move to struct ssh? */
1.196 djm 178: struct global_confirm {
179: TAILQ_ENTRY(global_confirm) entry;
180: global_confirm_cb *cb;
181: void *ctx;
182: int ref_count;
183: };
184: TAILQ_HEAD(global_confirms, global_confirm);
185: static struct global_confirms global_confirms =
186: TAILQ_HEAD_INITIALIZER(global_confirms);
187:
1.315 markus 188: void ssh_process_session2_setup(int, int, int, struct sshbuf *);
1.123 djm 189:
1.13 markus 190: /*
191: * Signal handler for the window change signal (SIGWINCH). This just sets a
192: * flag indicating that the window has changed.
193: */
1.157 deraadt 194: /*ARGSUSED */
1.77 itojun 195: static void
1.11 markus 196: window_change_handler(int sig)
1.1 deraadt 197: {
1.11 markus 198: received_window_change_signal = 1;
1.1 deraadt 199: }
200:
1.13 markus 201: /*
202: * Signal handler for signals that cause the program to terminate. These
203: * signals must be trapped to restore terminal modes.
204: */
1.157 deraadt 205: /*ARGSUSED */
1.77 itojun 206: static void
1.11 markus 207: signal_handler(int sig)
1.1 deraadt 208: {
1.75 markus 209: received_signal = sig;
210: quit_pending = 1;
1.1 deraadt 211: }
212:
1.13 markus 213: /*
1.222 djm 214: * Sets control_persist_exit_time to the absolute time when the
215: * backgrounded control master should exit due to expiry of the
216: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
217: * control master process, or if there is no ControlPersist timeout.
218: */
219: static void
1.303 djm 220: set_control_persist_exit_time(struct ssh *ssh)
1.222 djm 221: {
222: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 223: || options.control_persist_timeout == 0) {
1.222 djm 224: /* not using a ControlPersist timeout */
225: control_persist_exit_time = 0;
1.303 djm 226: } else if (channel_still_open(ssh)) {
1.222 djm 227: /* some client connections are still open */
228: if (control_persist_exit_time > 0)
1.354 djm 229: debug2_f("cancel scheduled exit");
1.222 djm 230: control_persist_exit_time = 0;
231: } else if (control_persist_exit_time <= 0) {
232: /* a client connection has recently closed */
1.251 dtucker 233: control_persist_exit_time = monotime() +
1.222 djm 234: (time_t)options.control_persist_timeout;
1.354 djm 235: debug2_f("schedule exit in %d seconds",
1.222 djm 236: options.control_persist_timeout);
237: }
238: /* else we are already counting down to the timeout */
239: }
240:
1.238 dtucker 241: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
242: static int
243: client_x11_display_valid(const char *display)
244: {
245: size_t i, dlen;
246:
1.279 djm 247: if (display == NULL)
248: return 0;
249:
1.238 dtucker 250: dlen = strlen(display);
251: for (i = 0; i < dlen; i++) {
1.256 deraadt 252: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 253: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
254: debug("Invalid character '%c' in DISPLAY", display[i]);
255: return 0;
256: }
257: }
258: return 1;
259: }
260:
1.274 djm 261: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
262: #define X11_TIMEOUT_SLACK 60
1.279 djm 263: int
1.303 djm 264: client_x11_get_proto(struct ssh *ssh, const char *display,
265: const char *xauth_path, u_int trusted, u_int timeout,
266: char **_proto, char **_data)
1.138 djm 267: {
1.318 djm 268: char *cmd, line[512], xdisplay[512];
1.279 djm 269: char xauthfile[PATH_MAX], xauthdir[PATH_MAX];
1.138 djm 270: static char proto[512], data[512];
271: FILE *f;
1.288 tedu 272: int got_data = 0, generated = 0, do_unlink = 0, r;
1.138 djm 273: struct stat st;
1.274 djm 274: u_int now, x11_timeout_real;
1.138 djm 275:
276: *_proto = proto;
277: *_data = data;
1.279 djm 278: proto[0] = data[0] = xauthfile[0] = xauthdir[0] = '\0';
1.138 djm 279:
1.279 djm 280: if (!client_x11_display_valid(display)) {
1.283 millert 281: if (display != NULL)
282: logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
283: display);
1.279 djm 284: return -1;
285: }
286: if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
1.138 djm 287: debug("No xauth program.");
1.279 djm 288: xauth_path = NULL;
289: }
290:
291: if (xauth_path != NULL) {
1.138 djm 292: /*
293: * Handle FamilyLocal case where $DISPLAY does
294: * not match an authorization entry. For this we
295: * just try "xauth list unix:displaynum.screennum".
296: * XXX: "localhost" match to determine FamilyLocal
297: * is not perfect.
298: */
299: if (strncmp(display, "localhost:", 10) == 0) {
1.279 djm 300: if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
301: display + 10)) < 0 ||
302: (size_t)r >= sizeof(xdisplay)) {
1.354 djm 303: error_f("display name too long");
1.279 djm 304: return -1;
305: }
1.138 djm 306: display = xdisplay;
307: }
308: if (trusted == 0) {
1.274 djm 309: /*
1.279 djm 310: * Generate an untrusted X11 auth cookie.
311: *
1.274 djm 312: * The authentication cookie should briefly outlive
313: * ssh's willingness to forward X11 connections to
314: * avoid nasty fail-open behaviour in the X server.
315: */
1.279 djm 316: mktemp_proto(xauthdir, sizeof(xauthdir));
317: if (mkdtemp(xauthdir) == NULL) {
1.354 djm 318: error_f("mkdtemp: %s", strerror(errno));
1.279 djm 319: return -1;
320: }
321: do_unlink = 1;
322: if ((r = snprintf(xauthfile, sizeof(xauthfile),
323: "%s/xauthfile", xauthdir)) < 0 ||
324: (size_t)r >= sizeof(xauthfile)) {
1.354 djm 325: error_f("xauthfile path too long");
1.279 djm 326: rmdir(xauthdir);
327: return -1;
328: }
329:
1.318 djm 330: if (timeout == 0) {
331: /* auth doesn't time out */
332: xasprintf(&cmd, "%s -f %s generate %s %s "
333: "untrusted 2>%s",
334: xauth_path, xauthfile, display,
335: SSH_X11_PROTO, _PATH_DEVNULL);
336: } else {
337: /* Add some slack to requested expiry */
338: if (timeout < UINT_MAX - X11_TIMEOUT_SLACK)
339: x11_timeout_real = timeout +
340: X11_TIMEOUT_SLACK;
341: else {
342: /* Don't overflow on long timeouts */
343: x11_timeout_real = UINT_MAX;
344: }
345: xasprintf(&cmd, "%s -f %s generate %s %s "
346: "untrusted timeout %u 2>%s",
347: xauth_path, xauthfile, display,
348: SSH_X11_PROTO, x11_timeout_real,
349: _PATH_DEVNULL);
350: }
1.354 djm 351: debug2_f("xauth command: %s", cmd);
1.318 djm 352:
353: if (timeout != 0 && x11_refuse_time == 0) {
1.279 djm 354: now = monotime() + 1;
355: if (UINT_MAX - timeout < now)
356: x11_refuse_time = UINT_MAX;
357: else
358: x11_refuse_time = now + timeout;
1.303 djm 359: channel_set_x11_refuse_time(ssh,
360: x11_refuse_time);
1.138 djm 361: }
1.279 djm 362: if (system(cmd) == 0)
363: generated = 1;
1.318 djm 364: free(cmd);
1.138 djm 365: }
1.181 markus 366:
367: /*
368: * When in untrusted mode, we read the cookie only if it was
369: * successfully generated as an untrusted one in the step
370: * above.
371: */
372: if (trusted || generated) {
1.318 djm 373: xasprintf(&cmd,
1.181 markus 374: "%s %s%s list %s 2>" _PATH_DEVNULL,
375: xauth_path,
376: generated ? "-f " : "" ,
377: generated ? xauthfile : "",
378: display);
379: debug2("x11_get_proto: %s", cmd);
380: f = popen(cmd, "r");
381: if (f && fgets(line, sizeof(line), f) &&
382: sscanf(line, "%*s %511s %511s", proto, data) == 2)
383: got_data = 1;
384: if (f)
385: pclose(f);
1.318 djm 386: free(cmd);
1.279 djm 387: }
1.138 djm 388: }
389:
390: if (do_unlink) {
391: unlink(xauthfile);
392: rmdir(xauthdir);
393: }
394:
1.279 djm 395: /* Don't fall back to fake X11 data for untrusted forwarding */
396: if (!trusted && !got_data) {
397: error("Warning: untrusted X11 forwarding setup failed: "
398: "xauth key data not generated");
399: return -1;
400: }
401:
1.138 djm 402: /*
403: * If we didn't get authentication data, just make up some
404: * data. The forwarding code will check the validity of the
405: * response anyway, and substitute this data. The X11
406: * server, however, will ignore this fake data and use
407: * whatever authentication mechanisms it was using otherwise
408: * for the local connection.
409: */
410: if (!got_data) {
1.288 tedu 411: u_int8_t rnd[16];
412: u_int i;
1.138 djm 413:
414: logit("Warning: No xauth data; "
415: "using fake authentication data for X11 forwarding.");
416: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.288 tedu 417: arc4random_buf(rnd, sizeof(rnd));
418: for (i = 0; i < sizeof(rnd); i++) {
1.138 djm 419: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.288 tedu 420: rnd[i]);
1.138 djm 421: }
422: }
1.279 djm 423:
424: return 0;
1.1 deraadt 425: }
426:
1.13 markus 427: /*
428: * Checks if the client window has changed, and sends a packet about it to
429: * the server if so. The actual change is detected elsewhere (by a software
430: * interrupt on Unix); this just checks the flag and sends a message if
431: * appropriate.
432: */
1.1 deraadt 433:
1.77 itojun 434: static void
1.303 djm 435: client_check_window_change(struct ssh *ssh)
1.1 deraadt 436: {
1.292 djm 437: if (!received_window_change_signal)
1.16 markus 438: return;
439: received_window_change_signal = 0;
1.354 djm 440: debug2_f("changed");
1.303 djm 441: channel_send_window_changes(ssh);
1.1 deraadt 442: }
443:
1.264 markus 444: static int
1.297 markus 445: client_global_request_reply(int type, u_int32_t seq, struct ssh *ssh)
1.117 markus 446: {
1.196 djm 447: struct global_confirm *gc;
448:
449: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 450: return 0;
1.196 djm 451: if (gc->cb != NULL)
1.303 djm 452: gc->cb(ssh, type, seq, gc->ctx);
1.196 djm 453: if (--gc->ref_count <= 0) {
454: TAILQ_REMOVE(&global_confirms, gc, entry);
1.342 jsg 455: freezero(gc, sizeof(*gc));
1.196 djm 456: }
457:
1.320 djm 458: ssh_packet_set_alive_timeouts(ssh, 0);
1.264 markus 459: return 0;
1.117 markus 460: }
461:
462: static void
1.345 dtucker 463: schedule_server_alive_check(void)
464: {
465: if (options.server_alive_interval > 0)
466: server_alive_time = monotime() + options.server_alive_interval;
467: }
468:
469: static void
1.320 djm 470: server_alive_check(struct ssh *ssh)
1.117 markus 471: {
1.320 djm 472: int r;
473:
474: if (ssh_packet_inc_alive_timeouts(ssh) > options.server_alive_count_max) {
1.228 djm 475: logit("Timeout, server %s not responding.", host);
1.176 markus 476: cleanup_exit(255);
477: }
1.320 djm 478: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
479: (r = sshpkt_put_cstring(ssh, "keepalive@openssh.com")) != 0 ||
480: (r = sshpkt_put_u8(ssh, 1)) != 0 || /* boolean: want reply */
481: (r = sshpkt_send(ssh)) != 0)
1.354 djm 482: fatal_fr(r, "send packet");
1.196 djm 483: /* Insert an empty placeholder to maintain ordering */
484: client_register_global_confirm(NULL, NULL);
1.345 dtucker 485: schedule_server_alive_check();
1.117 markus 486: }
487:
1.13 markus 488: /*
489: * Waits until the client can do something (some data becomes available on
490: * one of the file descriptors).
491: */
1.77 itojun 492: static void
1.303 djm 493: client_wait_until_can_do_something(struct ssh *ssh,
494: fd_set **readsetp, fd_set **writesetp,
1.130 avsm 495: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 496: {
1.117 markus 497: struct timeval tv, *tvp;
1.222 djm 498: int timeout_secs;
1.345 dtucker 499: time_t minwait_secs = 0, now = monotime();
1.315 markus 500: int r, ret;
1.117 markus 501:
1.46 markus 502: /* Add any selections by the channel mechanism. */
1.321 djm 503: channel_prepare_select(ssh, readsetp, writesetp, maxfdp,
1.302 djm 504: nallocp, &minwait_secs);
1.11 markus 505:
1.292 djm 506: /* channel_prepare_select could have closed the last channel */
1.303 djm 507: if (session_closed && !channel_still_open(ssh) &&
1.320 djm 508: !ssh_packet_have_data_to_write(ssh)) {
1.292 djm 509: /* clear mask since we did not call select() */
510: memset(*readsetp, 0, *nallocp);
511: memset(*writesetp, 0, *nallocp);
512: return;
1.16 markus 513: }
1.11 markus 514:
1.294 djm 515: FD_SET(connection_in, *readsetp);
516:
1.11 markus 517: /* Select server connection if have data to write to the server. */
1.320 djm 518: if (ssh_packet_have_data_to_write(ssh))
1.46 markus 519: FD_SET(connection_out, *writesetp);
1.11 markus 520:
1.13 markus 521: /*
522: * Wait for something to happen. This will suspend the process until
523: * some selected descriptor can be read, written, or has some other
1.222 djm 524: * event pending, or a timeout expires.
1.13 markus 525: */
1.11 markus 526:
1.222 djm 527: timeout_secs = INT_MAX; /* we use INT_MAX to mean no timeout */
1.345 dtucker 528: if (options.server_alive_interval > 0)
529: timeout_secs = MAXIMUM(server_alive_time - now, 0);
1.292 djm 530: if (options.rekey_interval > 0 && !rekeying)
1.320 djm 531: timeout_secs = MINIMUM(timeout_secs,
532: ssh_packet_get_rekey_timeout(ssh));
1.303 djm 533: set_control_persist_exit_time(ssh);
1.222 djm 534: if (control_persist_exit_time > 0) {
1.287 deraadt 535: timeout_secs = MINIMUM(timeout_secs,
1.249 dtucker 536: control_persist_exit_time - now);
1.222 djm 537: if (timeout_secs < 0)
538: timeout_secs = 0;
539: }
1.239 djm 540: if (minwait_secs != 0)
1.287 deraadt 541: timeout_secs = MINIMUM(timeout_secs, (int)minwait_secs);
1.222 djm 542: if (timeout_secs == INT_MAX)
1.117 markus 543: tvp = NULL;
1.129 deraadt 544: else {
1.222 djm 545: tv.tv_sec = timeout_secs;
1.117 markus 546: tv.tv_usec = 0;
547: tvp = &tv;
548: }
1.222 djm 549:
1.117 markus 550: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
1.326 deraadt 551: if (ret == -1) {
1.51 markus 552: /*
553: * We have to clear the select masks, because we return.
554: * We have to return, because the mainloop checks for the flags
555: * set by the signal handlers.
556: */
1.87 markus 557: memset(*readsetp, 0, *nallocp);
558: memset(*writesetp, 0, *nallocp);
1.11 markus 559: if (errno == EINTR)
560: return;
561: /* Note: we might still have data in the buffers. */
1.315 markus 562: if ((r = sshbuf_putf(stderr_buffer,
563: "select: %s\r\n", strerror(errno))) != 0)
1.354 djm 564: fatal_fr(r, "sshbuf_putf");
1.11 markus 565: quit_pending = 1;
1.345 dtucker 566: } else if (options.server_alive_interval > 0 && !FD_ISSET(connection_in,
567: *readsetp) && monotime() >= server_alive_time)
1.249 dtucker 568: /*
1.345 dtucker 569: * ServerAlive check is needed. We can't rely on the select
570: * timing out since traffic on the client side such as port
571: * forwards can keep waking it up.
1.249 dtucker 572: */
1.345 dtucker 573: server_alive_check(ssh);
1.11 markus 574: }
575:
1.77 itojun 576: static void
1.315 markus 577: client_suspend_self(struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr)
1.1 deraadt 578: {
1.11 markus 579: /* Flush stdout and stderr buffers. */
1.315 markus 580: if (sshbuf_len(bout) > 0)
581: atomicio(vwrite, fileno(stdout), sshbuf_mutable_ptr(bout),
582: sshbuf_len(bout));
583: if (sshbuf_len(berr) > 0)
584: atomicio(vwrite, fileno(stderr), sshbuf_mutable_ptr(berr),
585: sshbuf_len(berr));
1.11 markus 586:
1.233 djm 587: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 588:
1.305 djm 589: sshbuf_reset(bin);
590: sshbuf_reset(bout);
591: sshbuf_reset(berr);
1.11 markus 592:
593: /* Send the suspend signal to the program itself. */
594: kill(getpid(), SIGTSTP);
595:
1.132 djm 596: /* Reset window sizes in case they have changed */
597: received_window_change_signal = 1;
1.11 markus 598:
1.233 djm 599: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 600: }
601:
1.77 itojun 602: static void
1.320 djm 603: client_process_net_input(struct ssh *ssh, fd_set *readset)
1.11 markus 604: {
1.17 markus 605: char buf[8192];
1.315 markus 606: int r, len;
1.11 markus 607:
1.13 markus 608: /*
609: * Read input from the server, and add any such data to the buffer of
610: * the packet subsystem.
611: */
1.11 markus 612: if (FD_ISSET(connection_in, readset)) {
1.345 dtucker 613: schedule_server_alive_check();
1.11 markus 614: /* Read as much as possible. */
1.280 markus 615: len = read(connection_in, buf, sizeof(buf));
616: if (len == 0) {
1.197 djm 617: /*
618: * Received EOF. The remote host has closed the
619: * connection.
620: */
1.315 markus 621: if ((r = sshbuf_putf(stderr_buffer,
1.197 djm 622: "Connection to %.300s closed by remote host.\r\n",
1.315 markus 623: host)) != 0)
1.354 djm 624: fatal_fr(r, "sshbuf_putf");
1.1 deraadt 625: quit_pending = 1;
626: return;
1.11 markus 627: }
1.13 markus 628: /*
629: * There is a kernel bug on Solaris that causes select to
630: * sometimes wake up even though there is no data available.
631: */
1.326 deraadt 632: if (len == -1 && (errno == EAGAIN || errno == EINTR))
1.11 markus 633: len = 0;
634:
1.326 deraadt 635: if (len == -1) {
1.197 djm 636: /*
637: * An error has encountered. Perhaps there is a
638: * network problem.
639: */
1.315 markus 640: if ((r = sshbuf_putf(stderr_buffer,
1.197 djm 641: "Read from remote host %.300s: %.100s\r\n",
1.315 markus 642: host, strerror(errno))) != 0)
1.354 djm 643: fatal_fr(r, "sshbuf_putf");
1.11 markus 644: quit_pending = 1;
645: return;
646: }
1.320 djm 647: ssh_packet_process_incoming(ssh, buf, len);
1.11 markus 648: }
1.17 markus 649: }
1.16 markus 650:
1.97 jakob 651: static void
1.303 djm 652: client_status_confirm(struct ssh *ssh, int type, Channel *c, void *ctx)
1.123 djm 653: {
1.190 djm 654: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
655: char errmsg[256];
1.315 markus 656: int r, tochan;
1.190 djm 657:
1.234 djm 658: /*
659: * If a TTY was explicitly requested, then a failure to allocate
660: * one is fatal.
661: */
662: if (cr->action == CONFIRM_TTY &&
663: (options.request_tty == REQUEST_TTY_FORCE ||
664: options.request_tty == REQUEST_TTY_YES))
665: cr->action = CONFIRM_CLOSE;
666:
1.312 djm 667: /* XXX suppress on mux _client_ quietmode */
1.190 djm 668: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 669: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 670:
671: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
672: debug2("%s request accepted on channel %d",
673: cr->request_type, c->self);
674: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
675: if (tochan) {
676: snprintf(errmsg, sizeof(errmsg),
677: "%s request failed\r\n", cr->request_type);
678: } else {
679: snprintf(errmsg, sizeof(errmsg),
680: "%s request failed on channel %d",
681: cr->request_type, c->self);
682: }
683: /* If error occurred on primary session channel, then exit */
1.234 djm 684: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 685: fatal("%s", errmsg);
1.234 djm 686: /*
687: * If error occurred on mux client, append to
688: * their stderr.
689: */
690: if (tochan) {
1.360 djm 691: debug3_f("channel %d: mux request: %s", c->self,
692: cr->request_type);
1.315 markus 693: if ((r = sshbuf_put(c->extended, errmsg,
694: strlen(errmsg))) != 0)
1.354 djm 695: fatal_fr(r, "sshbuf_put");
1.234 djm 696: } else
1.190 djm 697: error("%s", errmsg);
1.234 djm 698: if (cr->action == CONFIRM_TTY) {
699: /*
700: * If a TTY allocation error occurred, then arrange
701: * for the correct TTY to leave raw mode.
702: */
703: if (c->self == session_ident)
704: leave_raw_mode(0);
705: else
1.303 djm 706: mux_tty_alloc_failed(ssh, c);
1.234 djm 707: } else if (cr->action == CONFIRM_CLOSE) {
1.303 djm 708: chan_read_failed(ssh, c);
709: chan_write_failed(ssh, c);
1.190 djm 710: }
711: }
1.250 djm 712: free(cr);
1.190 djm 713: }
714:
715: static void
1.303 djm 716: client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx)
1.190 djm 717: {
1.250 djm 718: free(ctx);
1.190 djm 719: }
1.129 deraadt 720:
1.236 djm 721: void
1.303 djm 722: client_expect_confirm(struct ssh *ssh, int id, const char *request,
1.234 djm 723: enum confirm_action action)
1.190 djm 724: {
1.255 djm 725: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 726:
1.190 djm 727: cr->request_type = request;
1.234 djm 728: cr->action = action;
1.123 djm 729:
1.303 djm 730: channel_register_status_confirm(ssh, id, client_status_confirm,
1.190 djm 731: client_abandon_status_confirm, cr);
1.196 djm 732: }
733:
734: void
735: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
736: {
1.201 djm 737: struct global_confirm *gc, *last_gc;
1.196 djm 738:
739: /* Coalesce identical callbacks */
1.201 djm 740: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
741: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
742: if (++last_gc->ref_count >= INT_MAX)
1.354 djm 743: fatal_f("last_gc->ref_count = %d",
744: last_gc->ref_count);
1.196 djm 745: return;
746: }
747:
1.255 djm 748: gc = xcalloc(1, sizeof(*gc));
1.196 djm 749: gc->cb = cb;
750: gc->ctx = ctx;
751: gc->ref_count = 1;
752: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 753: }
754:
755: static void
1.303 djm 756: process_cmdline(struct ssh *ssh)
1.97 jakob 757: {
758: void (*handler)(int);
1.261 millert 759: char *s, *cmd;
760: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
761: struct Forward fwd;
1.97 jakob 762:
1.257 tedu 763: memset(&fwd, 0, sizeof(fwd));
1.183 djm 764:
1.233 djm 765: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.332 dtucker 766: handler = ssh_signal(SIGINT, SIG_IGN);
1.99 markus 767: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 768: if (s == NULL)
769: goto out;
1.256 deraadt 770: while (isspace((u_char)*s))
1.97 jakob 771: s++;
1.121 djm 772: if (*s == '-')
773: s++; /* Skip cmdline '-', if any */
1.120 dtucker 774: if (*s == '\0')
1.97 jakob 775: goto out;
1.121 djm 776:
1.122 djm 777: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 778: logit("Commands:");
1.164 djm 779: logit(" -L[bind_address:]port:host:hostport "
780: "Request local forward");
781: logit(" -R[bind_address:]port:host:hostport "
782: "Request remote forward");
1.204 stevesk 783: logit(" -D[bind_address:]port "
784: "Request dynamic forward");
1.237 markus 785: logit(" -KL[bind_address:]port "
786: "Cancel local forward");
1.165 stevesk 787: logit(" -KR[bind_address:]port "
1.164 djm 788: "Cancel remote forward");
1.237 markus 789: logit(" -KD[bind_address:]port "
790: "Cancel dynamic forward");
1.146 reyk 791: if (!options.permit_local_command)
792: goto out;
1.164 djm 793: logit(" !args "
794: "Execute local command");
1.146 reyk 795: goto out;
796: }
797:
798: if (*s == '!' && options.permit_local_command) {
799: s++;
800: ssh_local_cmd(s);
1.121 djm 801: goto out;
802: }
803:
804: if (*s == 'K') {
805: delete = 1;
806: s++;
807: }
1.204 stevesk 808: if (*s == 'L')
809: local = 1;
810: else if (*s == 'R')
811: remote = 1;
812: else if (*s == 'D')
813: dynamic = 1;
814: else {
1.109 itojun 815: logit("Invalid command.");
1.97 jakob 816: goto out;
817: }
1.204 stevesk 818:
1.256 deraadt 819: while (isspace((u_char)*++s))
1.179 tedu 820: ;
1.97 jakob 821:
1.217 djm 822: /* XXX update list of forwards in options */
1.121 djm 823: if (delete) {
1.261 millert 824: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
825: if (!parse_forward(&fwd, s, 1, 0)) {
826: logit("Bad forwarding close specification.");
1.121 djm 827: goto out;
828: }
1.237 markus 829: if (remote)
1.303 djm 830: ok = channel_request_rforward_cancel(ssh, &fwd) == 0;
1.237 markus 831: else if (dynamic)
1.303 djm 832: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 833: 0, &options.fwd_opts) > 0;
1.237 markus 834: else
1.303 djm 835: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 836: CHANNEL_CANCEL_PORT_STATIC,
837: &options.fwd_opts) > 0;
1.237 markus 838: if (!ok) {
1.290 dtucker 839: logit("Unknown port forwarding.");
1.237 markus 840: goto out;
841: }
842: logit("Canceled forwarding.");
1.121 djm 843: } else {
1.209 djm 844: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 845: logit("Bad forwarding specification.");
846: goto out;
847: }
1.204 stevesk 848: if (local || dynamic) {
1.303 djm 849: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 850: &options.fwd_opts)) {
1.121 djm 851: logit("Port forwarding failed.");
852: goto out;
853: }
1.135 djm 854: } else {
1.303 djm 855: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 856: logit("Port forwarding failed.");
857: goto out;
858: }
1.135 djm 859: }
1.121 djm 860: logit("Forwarding port.");
861: }
862:
1.97 jakob 863: out:
1.332 dtucker 864: ssh_signal(SIGINT, handler);
1.233 djm 865: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 866: free(cmd);
867: free(fwd.listen_host);
1.261 millert 868: free(fwd.listen_path);
1.250 djm 869: free(fwd.connect_host);
1.261 millert 870: free(fwd.connect_path);
1.97 jakob 871: }
872:
1.244 dtucker 873: /* reasons to suppress output of an escape command in help output */
874: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 875: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
876: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
877: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.244 dtucker 878: struct escape_help_text {
879: const char *cmd;
880: const char *text;
881: unsigned int flags;
882: };
883: static struct escape_help_text esc_txt[] = {
884: {".", "terminate session", SUPPRESS_MUXMASTER},
885: {".", "terminate connection (and any multiplexed sessions)",
886: SUPPRESS_MUXCLIENT},
1.292 djm 887: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.244 dtucker 888: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1.292 djm 889: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 890: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 891: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
892: {"#", "list forwarded connections", SUPPRESS_NEVER},
893: {"&", "background ssh (when waiting for connections to terminate)",
894: SUPPRESS_MUXCLIENT},
895: {"?", "this message", SUPPRESS_NEVER},
896: };
897:
898: static void
1.315 markus 899: print_escape_help(struct sshbuf *b, int escape_char, int mux_client,
900: int using_stderr)
1.244 dtucker 901: {
902: unsigned int i, suppress_flags;
1.315 markus 903: int r;
1.244 dtucker 904:
1.315 markus 905: if ((r = sshbuf_putf(b,
906: "%c?\r\nSupported escape sequences:\r\n", escape_char)) != 0)
1.354 djm 907: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 908:
1.292 djm 909: suppress_flags =
1.244 dtucker 910: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
911: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
912: (using_stderr ? 0 : SUPPRESS_SYSLOG);
913:
914: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
915: if (esc_txt[i].flags & suppress_flags)
916: continue;
1.315 markus 917: if ((r = sshbuf_putf(b, " %c%-3s - %s\r\n",
918: escape_char, esc_txt[i].cmd, esc_txt[i].text)) != 0)
1.354 djm 919: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 920: }
921:
1.315 markus 922: if ((r = sshbuf_putf(b,
1.246 dtucker 923: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 924: "(Note that escapes are only recognized immediately after "
1.315 markus 925: "newline.)\r\n", escape_char, escape_char)) != 0)
1.354 djm 926: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 927: }
928:
1.314 djm 929: /*
1.296 naddy 930: * Process the characters one by one.
1.195 djm 931: */
1.77 itojun 932: static int
1.303 djm 933: process_escapes(struct ssh *ssh, Channel *c,
1.315 markus 934: struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr,
1.195 djm 935: char *buf, int len)
1.31 markus 936: {
937: pid_t pid;
1.315 markus 938: int r, bytes = 0;
1.42 markus 939: u_int i;
940: u_char ch;
1.31 markus 941: char *s;
1.294 djm 942: struct escape_filter_ctx *efc = c->filter_ctx == NULL ?
943: NULL : (struct escape_filter_ctx *)c->filter_ctx;
1.31 markus 944:
1.294 djm 945: if (c->filter_ctx == NULL)
946: return 0;
1.314 djm 947:
1.139 djm 948: if (len <= 0)
949: return (0);
950:
951: for (i = 0; i < (u_int)len; i++) {
1.31 markus 952: /* Get one character at a time. */
953: ch = buf[i];
954:
1.294 djm 955: if (efc->escape_pending) {
1.31 markus 956: /* We have previously seen an escape character. */
957: /* Clear the flag now. */
1.294 djm 958: efc->escape_pending = 0;
1.31 markus 959:
960: /* Process the escaped character. */
961: switch (ch) {
962: case '.':
963: /* Terminate the connection. */
1.315 markus 964: if ((r = sshbuf_putf(berr, "%c.\r\n",
965: efc->escape_char)) != 0)
1.354 djm 966: fatal_fr(r, "sshbuf_putf");
1.217 djm 967: if (c && c->ctl_chan != -1) {
1.303 djm 968: chan_read_failed(ssh, c);
969: chan_write_failed(ssh, c);
970: if (c->detach_user) {
971: c->detach_user(ssh,
972: c->self, NULL);
973: }
1.253 dtucker 974: c->type = SSH_CHANNEL_ABANDONED;
1.315 markus 975: sshbuf_reset(c->input);
1.303 djm 976: chan_ibuf_empty(ssh, c);
1.195 djm 977: return 0;
978: } else
979: quit_pending = 1;
1.31 markus 980: return -1;
981:
982: case 'Z' - 64:
1.195 djm 983: /* XXX support this for mux clients */
1.217 djm 984: if (c && c->ctl_chan != -1) {
1.245 dtucker 985: char b[16];
1.195 djm 986: noescape:
1.245 dtucker 987: if (ch == 'Z' - 64)
988: snprintf(b, sizeof b, "^Z");
989: else
990: snprintf(b, sizeof b, "%c", ch);
1.315 markus 991: if ((r = sshbuf_putf(berr,
1.245 dtucker 992: "%c%s escape not available to "
1.195 djm 993: "multiplexed sessions\r\n",
1.315 markus 994: efc->escape_char, b)) != 0)
1.354 djm 995: fatal_fr(r, "sshbuf_putf");
1.195 djm 996: continue;
997: }
1.197 djm 998: /* Suspend the program. Inform the user */
1.315 markus 999: if ((r = sshbuf_putf(berr,
1000: "%c^Z [suspend ssh]\r\n",
1001: efc->escape_char)) != 0)
1.354 djm 1002: fatal_fr(r, "sshbuf_putf");
1.31 markus 1003:
1004: /* Restore terminal modes and suspend. */
1005: client_suspend_self(bin, bout, berr);
1006:
1007: /* We have been continued. */
1008: continue;
1009:
1.111 markus 1010: case 'B':
1.315 markus 1011: if ((r = sshbuf_putf(berr,
1012: "%cB\r\n", efc->escape_char)) != 0)
1.354 djm 1013: fatal_fr(r, "sshbuf_putf");
1.303 djm 1014: channel_request_start(ssh, c->self, "break", 0);
1.315 markus 1015: if ((r = sshpkt_put_u32(ssh, 1000)) != 0 ||
1016: (r = sshpkt_send(ssh)) != 0)
1.354 djm 1017: fatal_fr(r, "send packet");
1.111 markus 1018: continue;
1019:
1.54 markus 1020: case 'R':
1.357 djm 1021: if (ssh->compat & SSH_BUG_NOREKEY)
1.292 djm 1022: logit("Server does not "
1023: "support re-keying");
1024: else
1025: need_rekeying = 1;
1.54 markus 1026: continue;
1027:
1.242 dtucker 1028: case 'V':
1029: /* FALLTHROUGH */
1030: case 'v':
1031: if (c && c->ctl_chan != -1)
1032: goto noescape;
1033: if (!log_is_on_stderr()) {
1.315 markus 1034: if ((r = sshbuf_putf(berr,
1.242 dtucker 1035: "%c%c [Logging to syslog]\r\n",
1.315 markus 1036: efc->escape_char, ch)) != 0)
1.354 djm 1037: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1038: continue;
1039: }
1040: if (ch == 'V' && options.log_level >
1041: SYSLOG_LEVEL_QUIET)
1042: log_change_level(--options.log_level);
1043: if (ch == 'v' && options.log_level <
1044: SYSLOG_LEVEL_DEBUG3)
1045: log_change_level(++options.log_level);
1.315 markus 1046: if ((r = sshbuf_putf(berr,
1.294 djm 1047: "%c%c [LogLevel %s]\r\n",
1048: efc->escape_char, ch,
1.315 markus 1049: log_level_name(options.log_level))) != 0)
1.354 djm 1050: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1051: continue;
1052:
1.31 markus 1053: case '&':
1.217 djm 1054: if (c && c->ctl_chan != -1)
1.195 djm 1055: goto noescape;
1.31 markus 1056: /*
1.197 djm 1057: * Detach the program (continue to serve
1058: * connections, but put in background and no
1059: * more new connections).
1.31 markus 1060: */
1061: /* Restore tty modes. */
1.233 djm 1062: leave_raw_mode(
1063: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1064:
1065: /* Stop listening for new connections. */
1.303 djm 1066: channel_stop_listening(ssh);
1.31 markus 1067:
1.354 djm 1068: if ((r = sshbuf_putf(berr, "%c& "
1069: "[backgrounded]\n", efc->escape_char)) != 0)
1070: fatal_fr(r, "sshbuf_putf");
1.31 markus 1071:
1072: /* Fork into background. */
1073: pid = fork();
1.326 deraadt 1074: if (pid == -1) {
1.31 markus 1075: error("fork: %.100s", strerror(errno));
1076: continue;
1077: }
1078: if (pid != 0) { /* This is the parent. */
1079: /* The parent just exits. */
1080: exit(0);
1081: }
1082: /* The child continues serving connections. */
1.292 djm 1083: /* fake EOF on stdin */
1.315 markus 1084: if ((r = sshbuf_put_u8(bin, 4)) != 0)
1.354 djm 1085: fatal_fr(r, "sshbuf_put_u8");
1.292 djm 1086: return -1;
1.31 markus 1087: case '?':
1.294 djm 1088: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1089: (c && c->ctl_chan != -1),
1090: log_is_on_stderr());
1.31 markus 1091: continue;
1092:
1093: case '#':
1.315 markus 1094: if ((r = sshbuf_putf(berr, "%c#\r\n",
1095: efc->escape_char)) != 0)
1.354 djm 1096: fatal_fr(r, "sshbuf_putf");
1.303 djm 1097: s = channel_open_message(ssh);
1.315 markus 1098: if ((r = sshbuf_put(berr, s, strlen(s))) != 0)
1.354 djm 1099: fatal_fr(r, "sshbuf_put");
1.250 djm 1100: free(s);
1.97 jakob 1101: continue;
1102:
1103: case 'C':
1.217 djm 1104: if (c && c->ctl_chan != -1)
1.206 djm 1105: goto noescape;
1.303 djm 1106: process_cmdline(ssh);
1.31 markus 1107: continue;
1108:
1109: default:
1.294 djm 1110: if (ch != efc->escape_char) {
1.315 markus 1111: if ((r = sshbuf_put_u8(bin,
1112: efc->escape_char)) != 0)
1.354 djm 1113: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1114: bytes++;
1115: }
1116: /* Escaped characters fall through here */
1117: break;
1118: }
1119: } else {
1120: /*
1.197 djm 1121: * The previous character was not an escape char.
1122: * Check if this is an escape.
1.31 markus 1123: */
1.294 djm 1124: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1125: /*
1126: * It is. Set the flag and continue to
1127: * next character.
1128: */
1.294 djm 1129: efc->escape_pending = 1;
1.31 markus 1130: continue;
1131: }
1132: }
1133:
1134: /*
1135: * Normal character. Record whether it was a newline,
1136: * and append it to the buffer.
1137: */
1138: last_was_cr = (ch == '\r' || ch == '\n');
1.315 markus 1139: if ((r = sshbuf_put_u8(bin, ch)) != 0)
1.354 djm 1140: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1141: bytes++;
1142: }
1143: return bytes;
1144: }
1145:
1.13 markus 1146: /*
1.15 markus 1147: * Get packets from the connection input buffer, and process them as long as
1148: * there are packets available.
1149: *
1150: * Any unknown packets received during the actual
1151: * session cause the session to terminate. This is
1152: * intended to make debugging easier since no
1153: * confirmations are sent. Any compatible protocol
1154: * extensions must be negotiated during the
1155: * preparatory phase.
1156: */
1157:
1.77 itojun 1158: static void
1.321 djm 1159: client_process_buffered_input_packets(struct ssh *ssh)
1.15 markus 1160: {
1.321 djm 1161: ssh_dispatch_run_fatal(ssh, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1162: }
1163:
1.31 markus 1164: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1165:
1.195 djm 1166: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1167: void *
1168: client_new_escape_filter_ctx(int escape_char)
1169: {
1170: struct escape_filter_ctx *ret;
1171:
1.255 djm 1172: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1173: ret->escape_pending = 0;
1174: ret->escape_char = escape_char;
1175: return (void *)ret;
1176: }
1177:
1.198 djm 1178: /* Free the escape filter context on channel free */
1179: void
1.303 djm 1180: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1181: {
1.250 djm 1182: free(ctx);
1.198 djm 1183: }
1184:
1.195 djm 1185: int
1.303 djm 1186: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1187: {
1.190 djm 1188: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1189: return 0;
1190:
1.303 djm 1191: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1192: buf, len);
1.30 markus 1193: }
1194:
1.77 itojun 1195: static void
1.303 djm 1196: client_channel_closed(struct ssh *ssh, int id, void *arg)
1.60 markus 1197: {
1.303 djm 1198: channel_cancel_cleanup(ssh, id);
1.60 markus 1199: session_closed = 1;
1.233 djm 1200: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1201: }
1202:
1.15 markus 1203: /*
1.13 markus 1204: * Implements the interactive session with the server. This is called after
1205: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1206: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1207: * used as an escape character for terminating or suspending the session.
1.13 markus 1208: */
1.20 markus 1209: int
1.303 djm 1210: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1211: int ssh2_chan_id)
1.1 deraadt 1212: {
1.46 markus 1213: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1214: double start_time, total_time;
1.284 djm 1215: int r, max_fd = 0, max_fd2 = 0, len;
1.200 markus 1216: u_int64_t ibytes, obytes;
1.130 avsm 1217: u_int nalloc = 0;
1.11 markus 1218:
1219: debug("Entering interactive session.");
1.277 semarie 1220:
1.278 semarie 1221: if (options.control_master &&
1.286 djm 1222: !option_clear_or_none(options.control_path)) {
1.278 semarie 1223: debug("pledge: id");
1.327 mestre 1224: if (pledge("stdio rpath wpath cpath unix inet dns recvfd sendfd proc exec id tty",
1.278 semarie 1225: NULL) == -1)
1.354 djm 1226: fatal_f("pledge(): %s", strerror(errno));
1.278 semarie 1227:
1228: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1229: debug("pledge: exec");
1230: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1231: NULL) == -1)
1.354 djm 1232: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1233:
1234: } else if (options.update_hostkeys) {
1235: debug("pledge: filesystem full");
1236: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1237: NULL) == -1)
1.354 djm 1238: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1239:
1.286 djm 1240: } else if (!option_clear_or_none(options.proxy_command) ||
1241: fork_after_authentication_flag) {
1.277 semarie 1242: debug("pledge: proc");
1243: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1.354 djm 1244: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1245:
1246: } else {
1247: debug("pledge: network");
1.300 mestre 1248: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.354 djm 1249: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1250: }
1.11 markus 1251:
1.307 dtucker 1252: start_time = monotime_double();
1.11 markus 1253:
1254: /* Initialize variables. */
1255: last_was_cr = 1;
1256: exit_status = -1;
1.320 djm 1257: connection_in = ssh_packet_get_connection_in(ssh);
1258: connection_out = ssh_packet_get_connection_out(ssh);
1.287 deraadt 1259: max_fd = MAXIMUM(connection_in, connection_out);
1.46 markus 1260:
1.11 markus 1261: quit_pending = 0;
1262:
1.315 markus 1263: /* Initialize buffer. */
1264: if ((stderr_buffer = sshbuf_new()) == NULL)
1.354 djm 1265: fatal_f("sshbuf_new failed");
1.11 markus 1266:
1.321 djm 1267: client_init_dispatch(ssh);
1.15 markus 1268:
1.105 markus 1269: /*
1270: * Set signal handlers, (e.g. to restore non-blocking mode)
1271: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1272: */
1.332 dtucker 1273: if (ssh_signal(SIGHUP, SIG_IGN) != SIG_IGN)
1274: ssh_signal(SIGHUP, signal_handler);
1275: if (ssh_signal(SIGINT, SIG_IGN) != SIG_IGN)
1276: ssh_signal(SIGINT, signal_handler);
1277: if (ssh_signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1278: ssh_signal(SIGQUIT, signal_handler);
1279: if (ssh_signal(SIGTERM, SIG_IGN) != SIG_IGN)
1280: ssh_signal(SIGTERM, signal_handler);
1281: ssh_signal(SIGWINCH, window_change_handler);
1.11 markus 1282:
1283: if (have_pty)
1.233 djm 1284: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1285:
1.292 djm 1286: session_ident = ssh2_chan_id;
1287: if (session_ident != -1) {
1288: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1289: channel_register_filter(ssh, session_ident,
1.292 djm 1290: client_simple_escape_filter, NULL,
1291: client_filter_cleanup,
1292: client_new_escape_filter_ctx(
1293: escape_char_arg));
1.232 djm 1294: }
1.303 djm 1295: channel_register_cleanup(ssh, session_ident,
1.292 djm 1296: client_channel_closed, 0);
1.48 markus 1297: }
1.345 dtucker 1298:
1299: schedule_server_alive_check();
1.30 markus 1300:
1.11 markus 1301: /* Main loop of the client for the interactive session mode. */
1302: while (!quit_pending) {
1303:
1.13 markus 1304: /* Process buffered packets sent by the server. */
1.321 djm 1305: client_process_buffered_input_packets(ssh);
1.11 markus 1306:
1.303 djm 1307: if (session_closed && !channel_still_open(ssh))
1.60 markus 1308: break;
1309:
1.303 djm 1310: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1311: debug("rekeying in progress");
1.284 djm 1312: } else if (need_rekeying) {
1313: /* manual rekey request */
1314: debug("need rekeying");
1.303 djm 1315: if ((r = kex_start_rekex(ssh)) != 0)
1.354 djm 1316: fatal_fr(r, "kex_start_rekex");
1.284 djm 1317: need_rekeying = 0;
1.56 markus 1318: } else {
1319: /*
1320: * Make packets from buffered channel data, and
1321: * enqueue them for sending to the server.
1322: */
1.320 djm 1323: if (ssh_packet_not_very_much_data_to_write(ssh))
1.303 djm 1324: channel_output_poll(ssh);
1.11 markus 1325:
1.56 markus 1326: /*
1327: * Check if the window size has changed, and buffer a
1328: * message about it to the server if so.
1329: */
1.303 djm 1330: client_check_window_change(ssh);
1.11 markus 1331:
1.56 markus 1332: if (quit_pending)
1333: break;
1334: }
1.13 markus 1335: /*
1336: * Wait until we have something to do (something becomes
1337: * available on one of the descriptors).
1338: */
1.81 markus 1339: max_fd2 = max_fd;
1.303 djm 1340: client_wait_until_can_do_something(ssh, &readset, &writeset,
1341: &max_fd2, &nalloc, ssh_packet_is_rekeying(ssh));
1.11 markus 1342:
1343: if (quit_pending)
1344: break;
1345:
1.56 markus 1346: /* Do channel operations unless rekeying in progress. */
1.303 djm 1347: if (!ssh_packet_is_rekeying(ssh))
1348: channel_after_select(ssh, readset, writeset);
1.11 markus 1349:
1.17 markus 1350: /* Buffer input from the connection. */
1.320 djm 1351: client_process_net_input(ssh, readset);
1.17 markus 1352:
1353: if (quit_pending)
1354: break;
1.11 markus 1355:
1.197 djm 1356: /*
1357: * Send as much buffered packet data as possible to the
1358: * sender.
1359: */
1.338 djm 1360: if (FD_ISSET(connection_out, writeset)) {
1361: if ((r = ssh_packet_write_poll(ssh)) != 0) {
1362: sshpkt_fatal(ssh, r,
1363: "%s: ssh_packet_write_poll", __func__);
1364: }
1365: }
1.222 djm 1366:
1367: /*
1368: * If we are a backgrounded control master, and the
1369: * timeout has expired without any active client
1370: * connections, then quit.
1371: */
1372: if (control_persist_exit_time > 0) {
1.251 dtucker 1373: if (monotime() >= control_persist_exit_time) {
1.222 djm 1374: debug("ControlPersist timeout expired");
1375: break;
1376: }
1377: }
1.11 markus 1378: }
1.250 djm 1379: free(readset);
1380: free(writeset);
1.11 markus 1381:
1382: /* Terminate the session. */
1383:
1384: /* Stop watching for window change. */
1.332 dtucker 1385: ssh_signal(SIGWINCH, SIG_DFL);
1.211 andreas 1386:
1.320 djm 1387: if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
1388: (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_BY_APPLICATION)) != 0 ||
1389: (r = sshpkt_put_cstring(ssh, "disconnected by user")) != 0 ||
1390: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* language tag */
1391: (r = sshpkt_send(ssh)) != 0 ||
1392: (r = ssh_packet_write_wait(ssh)) != 0)
1.354 djm 1393: fatal_fr(r, "send disconnect");
1.11 markus 1394:
1.303 djm 1395: channel_free_all(ssh);
1.11 markus 1396:
1.75 markus 1397: if (have_pty)
1.233 djm 1398: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1399:
1400: /* restore blocking io */
1401: if (!isatty(fileno(stdin)))
1402: unset_nonblock(fileno(stdin));
1403: if (!isatty(fileno(stdout)))
1404: unset_nonblock(fileno(stdout));
1405: if (!isatty(fileno(stderr)))
1406: unset_nonblock(fileno(stderr));
1.116 dtucker 1407:
1408: /*
1409: * If there was no shell or command requested, there will be no remote
1410: * exit status to be returned. In that case, clear error code if the
1411: * connection was deliberately terminated at this end.
1412: */
1413: if (no_shell_flag && received_signal == SIGTERM) {
1414: received_signal = 0;
1415: exit_status = 0;
1416: }
1.75 markus 1417:
1.301 dtucker 1418: if (received_signal) {
1419: verbose("Killed by signal %d.", (int) received_signal);
1.359 djm 1420: cleanup_exit(255);
1.301 dtucker 1421: }
1.75 markus 1422:
1.13 markus 1423: /*
1424: * In interactive mode (with pseudo tty) display a message indicating
1425: * that the connection has been closed.
1426: */
1.11 markus 1427: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.315 markus 1428: if ((r = sshbuf_putf(stderr_buffer,
1429: "Connection to %.64s closed.\r\n", host)) != 0)
1.354 djm 1430: fatal_fr(r, "sshbuf_putf");
1.11 markus 1431: }
1.70 markus 1432:
1.11 markus 1433: /* Output any buffered data for stderr. */
1.315 markus 1434: if (sshbuf_len(stderr_buffer) > 0) {
1.230 djm 1435: len = atomicio(vwrite, fileno(stderr),
1.315 markus 1436: (u_char *)sshbuf_ptr(stderr_buffer),
1437: sshbuf_len(stderr_buffer));
1438: if (len < 0 || (u_int)len != sshbuf_len(stderr_buffer))
1.11 markus 1439: error("Write failed flushing stderr buffer.");
1.315 markus 1440: else if ((r = sshbuf_consume(stderr_buffer, len)) != 0)
1.354 djm 1441: fatal_fr(r, "sshbuf_consume");
1.11 markus 1442: }
1443:
1444: /* Clear and free any buffers. */
1.315 markus 1445: sshbuf_free(stderr_buffer);
1.11 markus 1446:
1447: /* Report bytes transferred, and transfer rates. */
1.307 dtucker 1448: total_time = monotime_double() - start_time;
1.320 djm 1449: ssh_packet_get_bytes(ssh, &ibytes, &obytes);
1.200 markus 1450: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1451: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1452: if (total_time > 0)
1.200 markus 1453: verbose("Bytes per second: sent %.1f, received %.1f",
1454: obytes / total_time, ibytes / total_time);
1.11 markus 1455: /* Return the exit status of the program. */
1456: debug("Exit status %d", exit_status);
1457: return exit_status;
1.15 markus 1458: }
1459:
1460: /*********/
1461:
1.77 itojun 1462: static Channel *
1.303 djm 1463: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1464: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1465: {
1.103 deraadt 1466: Channel *c = NULL;
1.289 markus 1467: struct sshbuf *b = NULL;
1.40 markus 1468: char *listen_address, *originator_address;
1.320 djm 1469: u_int listen_port, originator_port;
1.289 markus 1470: int r;
1.40 markus 1471:
1472: /* Get rest of the packet */
1.320 djm 1473: if ((r = sshpkt_get_cstring(ssh, &listen_address, NULL)) != 0 ||
1474: (r = sshpkt_get_u32(ssh, &listen_port)) != 0 ||
1475: (r = sshpkt_get_cstring(ssh, &originator_address, NULL)) != 0 ||
1476: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1477: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1478: fatal_fr(r, "parse packet");
1.40 markus 1479:
1.354 djm 1480: debug_f("listen %s port %d, originator %s port %d",
1.261 millert 1481: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1482:
1.320 djm 1483: if (listen_port > 0xffff)
1.354 djm 1484: error_f("invalid listen port");
1.320 djm 1485: else if (originator_port > 0xffff)
1.354 djm 1486: error_f("invalid originator port");
1.320 djm 1487: else {
1488: c = channel_connect_by_listen_address(ssh,
1489: listen_address, listen_port, "forwarded-tcpip",
1490: originator_address);
1491: }
1.40 markus 1492:
1.289 markus 1493: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1494: if ((b = sshbuf_new()) == NULL) {
1.354 djm 1495: error_f("alloc reply");
1.289 markus 1496: goto out;
1497: }
1498: /* reconstruct and send to muxclient */
1499: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1500: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1501: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1502: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1503: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1504: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1505: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1506: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1507: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1508: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1509: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.354 djm 1510: error_fr(r, "compose for muxclient");
1.289 markus 1511: goto out;
1512: }
1513: }
1514:
1515: out:
1516: sshbuf_free(b);
1.250 djm 1517: free(originator_address);
1518: free(listen_address);
1.40 markus 1519: return c;
1520: }
1521:
1.103 deraadt 1522: static Channel *
1.303 djm 1523: client_request_forwarded_streamlocal(struct ssh *ssh,
1524: const char *request_type, int rchan)
1.261 millert 1525: {
1526: Channel *c = NULL;
1527: char *listen_path;
1.320 djm 1528: int r;
1.261 millert 1529:
1530: /* Get the remote path. */
1.320 djm 1531: if ((r = sshpkt_get_cstring(ssh, &listen_path, NULL)) != 0 ||
1532: (r = sshpkt_get_string(ssh, NULL, NULL)) != 0 || /* reserved */
1533: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1534: fatal_fr(r, "parse packet");
1.261 millert 1535:
1.354 djm 1536: debug_f("request: %s", listen_path);
1.261 millert 1537:
1.303 djm 1538: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1539: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1540: free(listen_path);
1541: return c;
1542: }
1543:
1544: static Channel *
1.303 djm 1545: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1546: {
1547: Channel *c = NULL;
1548: char *originator;
1.321 djm 1549: u_int originator_port;
1.320 djm 1550: int r, sock;
1.40 markus 1551:
1552: if (!options.forward_x11) {
1553: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1554: error("Warning: this is probably a break-in attempt by a "
1555: "malicious server.");
1.221 djm 1556: return NULL;
1557: }
1.274 djm 1558: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1559: verbose("Rejected X11 connection after ForwardX11Timeout "
1560: "expired");
1.40 markus 1561: return NULL;
1562: }
1.320 djm 1563: if ((r = sshpkt_get_cstring(ssh, &originator, NULL)) != 0 ||
1.321 djm 1564: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1.320 djm 1565: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1566: fatal_fr(r, "parse packet");
1.40 markus 1567: /* XXX check permission */
1.321 djm 1568: /* XXX range check originator port? */
1569: debug("client_request_x11: request from %s %u", originator,
1.47 markus 1570: originator_port);
1.250 djm 1571: free(originator);
1.303 djm 1572: sock = x11_connect_display(ssh);
1.67 markus 1573: if (sock < 0)
1574: return NULL;
1.303 djm 1575: c = channel_new(ssh, "x11",
1.67 markus 1576: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1577: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1578: c->force_drain = 1;
1.40 markus 1579: return c;
1580: }
1581:
1.103 deraadt 1582: static Channel *
1.303 djm 1583: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1584: {
1585: Channel *c = NULL;
1.262 djm 1586: int r, sock;
1.40 markus 1587:
1588: if (!options.forward_agent) {
1589: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1590: error("Warning: this is probably a break-in attempt by a "
1591: "malicious server.");
1.40 markus 1592: return NULL;
1593: }
1.330 djm 1594: if (forward_agent_sock_path == NULL) {
1595: r = ssh_get_authentication_socket(&sock);
1596: } else {
1597: r = ssh_get_authentication_socket_path(forward_agent_sock_path, &sock);
1598: }
1599: if (r != 0) {
1.262 djm 1600: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.354 djm 1601: debug_fr(r, "ssh_get_authentication_socket");
1.67 markus 1602: return NULL;
1.262 djm 1603: }
1.303 djm 1604: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1605: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1606: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1607: "authentication agent connection", 1);
1.82 markus 1608: c->force_drain = 1;
1.40 markus 1609: return c;
1.180 djm 1610: }
1611:
1.306 djm 1612: char *
1.303 djm 1613: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1.343 djm 1614: int local_tun, int remote_tun, channel_open_fn *cb, void *cbctx)
1.180 djm 1615: {
1616: Channel *c;
1.320 djm 1617: int r, fd;
1.306 djm 1618: char *ifname = NULL;
1.180 djm 1619:
1620: if (tun_mode == SSH_TUNMODE_NO)
1621: return 0;
1622:
1623: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1624:
1625: /* Open local tunnel device */
1.306 djm 1626: if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) {
1.180 djm 1627: error("Tunnel device open failed.");
1.306 djm 1628: return NULL;
1.180 djm 1629: }
1.306 djm 1630: debug("Tunnel forwarding using interface %s", ifname);
1.180 djm 1631:
1.303 djm 1632: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1633: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1634: c->datagram = 1;
1.343 djm 1635:
1636: if (cb != NULL)
1637: channel_register_open_confirm(ssh, c->self, cb, cbctx);
1.180 djm 1638:
1.320 djm 1639: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1640: (r = sshpkt_put_cstring(ssh, "tun@openssh.com")) != 0 ||
1641: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1642: (r = sshpkt_put_u32(ssh, c->local_window_max)) != 0 ||
1643: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1644: (r = sshpkt_put_u32(ssh, tun_mode)) != 0 ||
1645: (r = sshpkt_put_u32(ssh, remote_tun)) != 0 ||
1646: (r = sshpkt_send(ssh)) != 0)
1.321 djm 1647: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.180 djm 1648:
1.306 djm 1649: return ifname;
1.40 markus 1650: }
1651:
1.22 markus 1652: /* XXXX move to generic input handler */
1.264 markus 1653: static int
1.297 markus 1654: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1655: {
1656: Channel *c = NULL;
1.320 djm 1657: char *ctype = NULL;
1658: int r;
1659: u_int rchan;
1660: size_t len;
1661: u_int rmaxpack, rwindow;
1662:
1663: if ((r = sshpkt_get_cstring(ssh, &ctype, &len)) != 0 ||
1664: (r = sshpkt_get_u32(ssh, &rchan)) != 0 ||
1665: (r = sshpkt_get_u32(ssh, &rwindow)) != 0 ||
1666: (r = sshpkt_get_u32(ssh, &rmaxpack)) != 0)
1667: goto out;
1.22 markus 1668:
1.24 markus 1669: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1670: ctype, rchan, rwindow, rmaxpack);
1671:
1.40 markus 1672: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1673: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1674: rmaxpack);
1.261 millert 1675: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1676: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1677: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1678: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1679: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1680: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1681: }
1.289 markus 1682: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1683: debug3("proxied to downstream: %s", ctype);
1684: } else if (c != NULL) {
1.22 markus 1685: debug("confirm %s", ctype);
1686: c->remote_id = rchan;
1.304 djm 1687: c->have_remote_id = 1;
1.22 markus 1688: c->remote_window = rwindow;
1689: c->remote_maxpacket = rmaxpack;
1.69 markus 1690: if (c->type != SSH_CHANNEL_CONNECTING) {
1.320 djm 1691: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
1692: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1693: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1694: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1695: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1696: (r = sshpkt_send(ssh)) != 0)
1697: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.69 markus 1698: }
1.22 markus 1699: } else {
1700: debug("failure %s", ctype);
1.320 djm 1701: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE)) != 0 ||
1702: (r = sshpkt_put_u32(ssh, rchan)) != 0 ||
1703: (r = sshpkt_put_u32(ssh, SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED)) != 0 ||
1704: (r = sshpkt_put_cstring(ssh, "open failed")) != 0 ||
1705: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
1706: (r = sshpkt_send(ssh)) != 0)
1707: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.22 markus 1708: }
1.320 djm 1709: r = 0;
1710: out:
1.250 djm 1711: free(ctype);
1.320 djm 1712: return r;
1.22 markus 1713: }
1.267 djm 1714:
1.264 markus 1715: static int
1.297 markus 1716: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1717: {
1718: Channel *c = NULL;
1.320 djm 1719: char *rtype = NULL;
1720: u_char reply;
1721: u_int id, exitval;
1722: int r, success = 0;
1723:
1724: if ((r = sshpkt_get_u32(ssh, &id)) != 0)
1725: return r;
1726: if (id <= INT_MAX)
1727: c = channel_lookup(ssh, id);
1.297 markus 1728: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1729: return 0;
1.320 djm 1730: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
1731: (r = sshpkt_get_u8(ssh, &reply)) != 0)
1732: goto out;
1.48 markus 1733:
1.320 djm 1734: debug("client_input_channel_req: channel %u rtype %s reply %d",
1.48 markus 1735: id, rtype, reply);
1736:
1.320 djm 1737: if (c == NULL) {
1.197 djm 1738: error("client_input_channel_req: channel %d: "
1739: "unknown channel", id);
1.193 markus 1740: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1.320 djm 1741: if ((r = sshpkt_get_end(ssh)) != 0)
1742: goto out;
1.303 djm 1743: chan_rcvd_eow(ssh, c);
1.48 markus 1744: } else if (strcmp(rtype, "exit-status") == 0) {
1.320 djm 1745: if ((r = sshpkt_get_u32(ssh, &exitval)) != 0)
1746: goto out;
1.217 djm 1747: if (c->ctl_chan != -1) {
1.303 djm 1748: mux_exit_message(ssh, c, exitval);
1.215 djm 1749: success = 1;
1.320 djm 1750: } else if ((int)id == session_ident) {
1.215 djm 1751: /* Record exit value of local session */
1.123 djm 1752: success = 1;
1753: exit_status = exitval;
1.215 djm 1754: } else {
1.218 djm 1755: /* Probably for a mux channel that has already closed */
1.354 djm 1756: debug_f("no sink for exit-status on channel %d",
1757: id);
1.123 djm 1758: }
1.320 djm 1759: if ((r = sshpkt_get_end(ssh)) != 0)
1760: goto out;
1.48 markus 1761: }
1.259 djm 1762: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1763: if (!c->have_remote_id)
1.354 djm 1764: fatal_f("channel %d: no remote_id", c->self);
1.320 djm 1765: if ((r = sshpkt_start(ssh, success ?
1766: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE)) != 0 ||
1767: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1768: (r = sshpkt_send(ssh)) != 0)
1769: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.48 markus 1770: }
1.320 djm 1771: r = 0;
1772: out:
1.250 djm 1773: free(rtype);
1.320 djm 1774: return r;
1.48 markus 1775: }
1.267 djm 1776:
1.269 djm 1777: struct hostkeys_update_ctx {
1778: /* The hostname and (optionally) IP address string for the server */
1779: char *host_str, *ip_str;
1780:
1781: /*
1782: * Keys received from the server and a flag for each indicating
1783: * whether they already exist in known_hosts.
1.351 djm 1784: * keys_match is filled in by hostkeys_find() and later (for new
1.269 djm 1785: * keys) by client_global_hostkeys_private_confirm().
1786: */
1787: struct sshkey **keys;
1.351 djm 1788: u_int *keys_match; /* mask of HKF_MATCH_* from hostfile.h */
1789: int *keys_verified; /* flag for new keys verified by server */
1790: size_t nkeys, nnew, nincomplete; /* total, new keys, incomplete match */
1.269 djm 1791:
1792: /*
1793: * Keys that are in known_hosts, but were not present in the update
1794: * from the server (i.e. scheduled to be deleted).
1795: * Filled in by hostkeys_find().
1796: */
1797: struct sshkey **old_keys;
1798: size_t nold;
1.347 djm 1799:
1800: /* Various special cases. */
1.350 djm 1801: int complex_hostspec; /* wildcard or manual pattern-list host name */
1.347 djm 1802: int ca_available; /* saw CA key for this host */
1.352 djm 1803: int old_key_seen; /* saw old key with other name/addr */
1.353 djm 1804: int other_name_seen; /* saw key with other name/addr */
1.269 djm 1805: };
1806:
1807: static void
1808: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1809: {
1810: size_t i;
1811:
1812: if (ctx == NULL)
1813: return;
1814: for (i = 0; i < ctx->nkeys; i++)
1815: sshkey_free(ctx->keys[i]);
1816: free(ctx->keys);
1.351 djm 1817: free(ctx->keys_match);
1818: free(ctx->keys_verified);
1.269 djm 1819: for (i = 0; i < ctx->nold; i++)
1820: sshkey_free(ctx->old_keys[i]);
1821: free(ctx->old_keys);
1822: free(ctx->host_str);
1823: free(ctx->ip_str);
1824: free(ctx);
1825: }
1826:
1.350 djm 1827: /*
1828: * Returns non-zero if a known_hosts hostname list is not of a form that
1829: * can be handled by UpdateHostkeys. These include wildcard hostnames and
1830: * hostnames lists that do not follow the form host[,ip].
1831: */
1832: static int
1833: hostspec_is_complex(const char *hosts)
1834: {
1835: char *cp;
1836:
1837: /* wildcard */
1838: if (strchr(hosts, '*') != NULL || strchr(hosts, '?') != NULL)
1839: return 1;
1840: /* single host/ip = ok */
1841: if ((cp = strchr(hosts, ',')) == NULL)
1842: return 0;
1843: /* more than two entries on the line */
1844: if (strchr(cp + 1, ',') != NULL)
1845: return 1;
1846: /* XXX maybe parse cp+1 and ensure it is an IP? */
1847: return 0;
1848: }
1849:
1.352 djm 1850: /* callback to search for ctx->keys in known_hosts */
1.269 djm 1851: static int
1852: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
1853: {
1854: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1855: size_t i;
1856: struct sshkey **tmp;
1857:
1.353 djm 1858: if (l->key == NULL)
1.269 djm 1859: return 0;
1.353 djm 1860: if (l->status != HKF_STATUS_MATCHED) {
1861: /* Record if one of the keys appears on a non-matching line */
1862: for (i = 0; i < ctx->nkeys; i++) {
1863: if (sshkey_equal(l->key, ctx->keys[i])) {
1864: ctx->other_name_seen = 1;
1.354 djm 1865: debug3_f("found %s key under different "
1866: "name/addr at %s:%ld",
1.353 djm 1867: sshkey_ssh_name(ctx->keys[i]),
1868: l->path, l->linenum);
1869: return 0;
1870: }
1871: }
1872: return 0;
1873: }
1874: /* Don't proceed if revocation or CA markers are present */
1875: /* XXX relax this */
1876: if (l->marker != MRK_NONE) {
1.354 djm 1877: debug3_f("hostkeys file %s:%ld has CA/revocation marker",
1878: l->path, l->linenum);
1.353 djm 1879: ctx->complex_hostspec = 1;
1880: return 0;
1881: }
1882:
1.355 djm 1883: /* If CheckHostIP is enabled, then check for mismatched hostname/addr */
1884: if (ctx->ip_str != NULL && strchr(l->hosts, ',') != NULL) {
1885: if ((l->match & HKF_MATCH_HOST) == 0) {
1886: /* Record if address matched a different hostname. */
1887: ctx->other_name_seen = 1;
1888: debug3_f("found address %s against different hostname "
1889: "at %s:%ld", ctx->ip_str, l->path, l->linenum);
1890: return 0;
1891: } else if ((l->match & HKF_MATCH_IP) == 0) {
1892: /* Record if hostname matched a different address. */
1893: ctx->other_name_seen = 1;
1894: debug3_f("found hostname %s against different address "
1895: "at %s:%ld", ctx->host_str, l->path, l->linenum);
1896: }
1.353 djm 1897: }
1.269 djm 1898:
1.350 djm 1899: /*
1900: * UpdateHostkeys is skipped for wildcard host names and hostnames
1901: * that contain more than two entries (ssh never writes these).
1902: */
1903: if (hostspec_is_complex(l->hosts)) {
1.354 djm 1904: debug3_f("hostkeys file %s:%ld complex host specification",
1905: l->path, l->linenum);
1.350 djm 1906: ctx->complex_hostspec = 1;
1.347 djm 1907: return 0;
1908: }
1909:
1.269 djm 1910: /* Mark off keys we've already seen for this host */
1911: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 1912: if (!sshkey_equal(l->key, ctx->keys[i]))
1913: continue;
1.354 djm 1914: debug3_f("found %s key at %s:%ld",
1.351 djm 1915: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
1916: ctx->keys_match[i] |= l->match;
1917: return 0;
1.269 djm 1918: }
1919: /* This line contained a key that not offered by the server */
1.354 djm 1920: debug3_f("deprecated %s key at %s:%ld", sshkey_ssh_name(l->key),
1921: l->path, l->linenum);
1.299 deraadt 1922: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 1923: sizeof(*ctx->old_keys))) == NULL)
1.354 djm 1924: fatal_f("recallocarray failed nold = %zu", ctx->nold);
1.269 djm 1925: ctx->old_keys = tmp;
1926: ctx->old_keys[ctx->nold++] = l->key;
1927: l->key = NULL;
1928:
1929: return 0;
1930: }
1931:
1.352 djm 1932: /* callback to search for ctx->old_keys in known_hosts under other names */
1933: static int
1934: hostkeys_check_old(struct hostkey_foreach_line *l, void *_ctx)
1935: {
1936: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1937: size_t i;
1938: int hashed;
1939:
1940: /* only care about lines that *don't* match the active host spec */
1941: if (l->status == HKF_STATUS_MATCHED || l->key == NULL)
1942: return 0;
1943:
1944: hashed = l->match & (HKF_MATCH_HOST_HASHED|HKF_MATCH_IP_HASHED);
1945: for (i = 0; i < ctx->nold; i++) {
1946: if (!sshkey_equal(l->key, ctx->old_keys[i]))
1947: continue;
1.354 djm 1948: debug3_f("found deprecated %s key at %s:%ld as %s",
1.352 djm 1949: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum,
1950: hashed ? "[HASHED]" : l->hosts);
1951: ctx->old_key_seen = 1;
1952: break;
1953: }
1954: return 0;
1955: }
1956:
1957: /*
1958: * Check known_hosts files for deprecated keys under other names. Returns 0
1959: * on success or -1 on failure. Updates ctx->old_key_seen if deprecated keys
1960: * exist under names other than the active hostname/IP.
1961: */
1962: static int
1963: check_old_keys_othernames(struct hostkeys_update_ctx *ctx)
1964: {
1965: size_t i;
1966: int r;
1967:
1.354 djm 1968: debug2_f("checking for %zu deprecated keys", ctx->nold);
1.352 djm 1969: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 1970: debug3_f("searching %s for %s / %s",
1.352 djm 1971: options.user_hostfiles[i], ctx->host_str,
1972: ctx->ip_str ? ctx->ip_str : "(none)");
1973: if ((r = hostkeys_foreach(options.user_hostfiles[i],
1974: hostkeys_check_old, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 1975: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.352 djm 1976: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 1977: debug_f("hostkeys file %s does not exist",
1978: options.user_hostfiles[i]);
1.352 djm 1979: continue;
1980: }
1.354 djm 1981: error_fr(r, "hostkeys_foreach failed for %s",
1982: options.user_hostfiles[i]);
1.352 djm 1983: return -1;
1984: }
1985: }
1986: return 0;
1987: }
1988:
1.269 djm 1989: static void
1.337 djm 1990: hostkey_change_preamble(LogLevel loglevel)
1.269 djm 1991: {
1.336 djm 1992: do_log2(loglevel, "The server has updated its host keys.");
1993: do_log2(loglevel, "These changes were verified by the server's "
1994: "existing trusted key.");
1995: }
1996:
1997: static void
1998: update_known_hosts(struct hostkeys_update_ctx *ctx)
1999: {
2000: int r, was_raw = 0, first = 1;
2001: int asking = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK;
2002: LogLevel loglevel = asking ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1.269 djm 2003: char *fp, *response;
2004: size_t i;
1.333 djm 2005: struct stat sb;
1.269 djm 2006:
2007: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2008: if (!ctx->keys_verified[i])
1.269 djm 2009: continue;
2010: if ((fp = sshkey_fingerprint(ctx->keys[i],
2011: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2012: fatal_f("sshkey_fingerprint failed");
1.336 djm 2013: if (first && asking)
1.337 djm 2014: hostkey_change_preamble(loglevel);
1.269 djm 2015: do_log2(loglevel, "Learned new hostkey: %s %s",
2016: sshkey_type(ctx->keys[i]), fp);
1.336 djm 2017: first = 0;
1.269 djm 2018: free(fp);
2019: }
2020: for (i = 0; i < ctx->nold; i++) {
2021: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2022: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2023: fatal_f("sshkey_fingerprint failed");
1.336 djm 2024: if (first && asking)
1.337 djm 2025: hostkey_change_preamble(loglevel);
1.269 djm 2026: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2027: sshkey_type(ctx->old_keys[i]), fp);
1.336 djm 2028: first = 0;
1.269 djm 2029: free(fp);
2030: }
2031: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2032: if (get_saved_tio() != NULL) {
2033: leave_raw_mode(1);
2034: was_raw = 1;
2035: }
1.269 djm 2036: response = NULL;
2037: for (i = 0; !quit_pending && i < 3; i++) {
2038: free(response);
2039: response = read_passphrase("Accept updated hostkeys? "
2040: "(yes/no): ", RP_ECHO);
2041: if (strcasecmp(response, "yes") == 0)
2042: break;
2043: else if (quit_pending || response == NULL ||
2044: strcasecmp(response, "no") == 0) {
2045: options.update_hostkeys = 0;
2046: break;
2047: } else {
2048: do_log2(loglevel, "Please enter "
2049: "\"yes\" or \"no\"");
2050: }
2051: }
2052: if (quit_pending || i >= 3 || response == NULL)
2053: options.update_hostkeys = 0;
2054: free(response);
1.271 djm 2055: if (was_raw)
2056: enter_raw_mode(1);
1.269 djm 2057: }
1.333 djm 2058: if (options.update_hostkeys == 0)
2059: return;
1.269 djm 2060: /*
2061: * Now that all the keys are verified, we can go ahead and replace
2062: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2063: * cancel the operation).
2064: */
1.333 djm 2065: for (i = 0; i < options.num_user_hostfiles; i++) {
2066: /*
2067: * NB. keys are only added to hostfiles[0], for the rest we
2068: * just delete the hostname entries.
2069: */
2070: if (stat(options.user_hostfiles[i], &sb) != 0) {
2071: if (errno == ENOENT) {
1.354 djm 2072: debug_f("known hosts file %s does not "
2073: "exist", options.user_hostfiles[i]);
1.333 djm 2074: } else {
1.354 djm 2075: error_f("known hosts file %s "
2076: "inaccessible: %s",
2077: options.user_hostfiles[i], strerror(errno));
1.333 djm 2078: }
2079: continue;
2080: }
2081: if ((r = hostfile_replace_entries(options.user_hostfiles[i],
2082: ctx->host_str, ctx->ip_str,
2083: i == 0 ? ctx->keys : NULL, i == 0 ? ctx->nkeys : 0,
2084: options.hash_known_hosts, 0,
2085: options.fingerprint_hash)) != 0) {
1.354 djm 2086: error_fr(r, "hostfile_replace_entries failed for %s",
2087: options.user_hostfiles[i]);
1.333 djm 2088: }
2089: }
1.269 djm 2090: }
2091:
2092: static void
1.303 djm 2093: client_global_hostkeys_private_confirm(struct ssh *ssh, int type,
2094: u_int32_t seq, void *_ctx)
1.269 djm 2095: {
2096: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2097: size_t i, ndone;
2098: struct sshbuf *signdata;
1.309 djm 2099: int r, kexsigtype, use_kexsigtype;
1.269 djm 2100: const u_char *sig;
2101: size_t siglen;
2102:
2103: if (ctx->nnew == 0)
1.354 djm 2104: fatal_f("ctx->nnew == 0"); /* sanity */
1.269 djm 2105: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2106: error("Server failed to confirm ownership of "
2107: "private host keys");
2108: hostkeys_update_ctx_free(ctx);
2109: return;
2110: }
1.309 djm 2111: kexsigtype = sshkey_type_plain(
2112: sshkey_type_from_name(ssh->kex->hostkey_alg));
2113:
1.269 djm 2114: if ((signdata = sshbuf_new()) == NULL)
1.354 djm 2115: fatal_f("sshbuf_new failed");
1.269 djm 2116: /*
2117: * Expect a signature for each of the ctx->nnew private keys we
2118: * haven't seen before. They will be in the same order as the
1.351 djm 2119: * ctx->keys where the corresponding ctx->keys_match[i] == 0.
1.269 djm 2120: */
2121: for (ndone = i = 0; i < ctx->nkeys; i++) {
1.351 djm 2122: if (ctx->keys_match[i])
1.269 djm 2123: continue;
2124: /* Prepare data to be signed: session ID, unique string, key */
2125: sshbuf_reset(signdata);
1.270 djm 2126: if ( (r = sshbuf_put_cstring(signdata,
2127: "hostkeys-prove-00@openssh.com")) != 0 ||
1.358 djm 2128: (r = sshbuf_put_stringb(signdata,
2129: ssh->kex->session_id)) != 0 ||
1.269 djm 2130: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1.354 djm 2131: fatal_fr(r, "compose signdata");
1.269 djm 2132: /* Extract and verify signature */
2133: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1.354 djm 2134: error_fr(r, "parse sig");
1.269 djm 2135: goto out;
2136: }
1.309 djm 2137: /*
2138: * For RSA keys, prefer to use the signature type negotiated
2139: * during KEX to the default (SHA1).
2140: */
2141: use_kexsigtype = kexsigtype == KEY_RSA &&
2142: sshkey_type_plain(ctx->keys[i]->type) == KEY_RSA;
1.361 ! djm 2143: debug3_f("verify %s key %zu using %s sigalg",
! 2144: sshkey_type(ctx->keys[i]), i,
! 2145: use_kexsigtype ? ssh->kex->hostkey_alg : NULL);
1.269 djm 2146: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1.308 djm 2147: sshbuf_ptr(signdata), sshbuf_len(signdata),
1.329 djm 2148: use_kexsigtype ? ssh->kex->hostkey_alg : NULL, 0,
2149: NULL)) != 0) {
1.361 ! djm 2150: error_fr(r, "server gave bad signature for %s key %zu",
1.354 djm 2151: sshkey_type(ctx->keys[i]), i);
1.269 djm 2152: goto out;
2153: }
2154: /* Key is good. Mark it as 'seen' */
1.351 djm 2155: ctx->keys_verified[i] = 1;
1.269 djm 2156: ndone++;
2157: }
1.354 djm 2158: /* Shouldn't happen */
1.269 djm 2159: if (ndone != ctx->nnew)
1.354 djm 2160: fatal_f("ndone != ctx->nnew (%zu / %zu)", ndone, ctx->nnew);
1.320 djm 2161: if ((r = sshpkt_get_end(ssh)) != 0) {
1.354 djm 2162: error_f("protocol error");
1.320 djm 2163: goto out;
2164: }
1.269 djm 2165:
2166: /* Make the edits to known_hosts */
2167: update_known_hosts(ctx);
2168: out:
2169: hostkeys_update_ctx_free(ctx);
2170: }
2171:
1.267 djm 2172: /*
1.291 djm 2173: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
2174: * Made slightly less trivial by the multiple RSA signature algorithm names.
2175: */
2176: static int
2177: key_accepted_by_hostkeyalgs(const struct sshkey *key)
2178: {
2179: const char *ktype = sshkey_ssh_name(key);
1.331 dtucker 2180: const char *hostkeyalgs = options.hostkeyalgorithms;
1.291 djm 2181:
2182: if (key == NULL || key->type == KEY_UNSPEC)
2183: return 0;
2184: if (key->type == KEY_RSA &&
2185: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
2186: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
2187: return 1;
2188: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
2189: }
2190:
2191: /*
1.270 djm 2192: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2193: * the server's hostkeys. The keys are checked against the user's
2194: * HostkeyAlgorithms preference before they are accepted.
2195: */
2196: static int
1.321 djm 2197: client_input_hostkeys(struct ssh *ssh)
1.267 djm 2198: {
2199: const u_char *blob = NULL;
1.269 djm 2200: size_t i, len = 0;
1.267 djm 2201: struct sshbuf *buf = NULL;
1.269 djm 2202: struct sshkey *key = NULL, **tmp;
2203: int r;
2204: char *fp;
1.267 djm 2205: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2206: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2207: struct hostkeys_update_ctx *ctx = NULL;
1.351 djm 2208: u_int want;
1.267 djm 2209:
2210: if (hostkeys_seen)
1.354 djm 2211: fatal_f("server already sent hostkeys");
1.269 djm 2212: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2213: options.batch_mode)
2214: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2215: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2216: return 1;
1.272 djm 2217:
2218: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2219: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2220: sshkey_free(key);
2221: key = NULL;
1.269 djm 2222: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
1.354 djm 2223: error_fr(r, "parse key");
1.269 djm 2224: goto out;
2225: }
1.270 djm 2226: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
1.354 djm 2227: do_log2_fr(r, r == SSH_ERR_KEY_TYPE_UNKNOWN ?
1.335 djm 2228: SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_ERROR,
1.354 djm 2229: "convert key");
1.335 djm 2230: continue;
1.270 djm 2231: }
1.267 djm 2232: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2233: SSH_FP_DEFAULT);
1.354 djm 2234: debug3_f("received %s key %s", sshkey_type(key), fp);
1.267 djm 2235: free(fp);
1.275 markus 2236:
1.291 djm 2237: if (!key_accepted_by_hostkeyalgs(key)) {
1.354 djm 2238: debug3_f("%s key not permitted by "
2239: "HostkeyAlgorithms", sshkey_ssh_name(key));
1.267 djm 2240: continue;
2241: }
1.269 djm 2242: /* Skip certs */
2243: if (sshkey_is_cert(key)) {
1.354 djm 2244: debug3_f("%s key is a certificate; skipping",
2245: sshkey_ssh_name(key));
1.269 djm 2246: continue;
2247: }
2248: /* Ensure keys are unique */
2249: for (i = 0; i < ctx->nkeys; i++) {
2250: if (sshkey_equal(key, ctx->keys[i])) {
1.354 djm 2251: error_f("received duplicated %s host key",
2252: sshkey_ssh_name(key));
1.269 djm 2253: goto out;
2254: }
2255: }
2256: /* Key is good, record it */
1.299 deraadt 2257: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2258: sizeof(*ctx->keys))) == NULL)
1.354 djm 2259: fatal_f("recallocarray failed nkeys = %zu",
2260: ctx->nkeys);
1.269 djm 2261: ctx->keys = tmp;
2262: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2263: key = NULL;
2264: }
2265:
1.269 djm 2266: if (ctx->nkeys == 0) {
1.354 djm 2267: debug_f("server sent no hostkeys");
1.267 djm 2268: goto out;
2269: }
1.270 djm 2270:
1.351 djm 2271: if ((ctx->keys_match = calloc(ctx->nkeys,
2272: sizeof(*ctx->keys_match))) == NULL ||
2273: (ctx->keys_verified = calloc(ctx->nkeys,
2274: sizeof(*ctx->keys_verified))) == NULL)
1.354 djm 2275: fatal_f("calloc failed");
1.267 djm 2276:
1.268 djm 2277: get_hostfile_hostname_ipaddr(host,
2278: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2279: options.port, &ctx->host_str,
2280: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2281:
1.269 djm 2282: /* Find which keys we already know about. */
1.333 djm 2283: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 2284: debug_f("searching %s for %s / %s",
1.339 dtucker 2285: options.user_hostfiles[i], ctx->host_str,
1.340 dtucker 2286: ctx->ip_str ? ctx->ip_str : "(none)");
1.333 djm 2287: if ((r = hostkeys_foreach(options.user_hostfiles[i],
2288: hostkeys_find, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 2289: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.333 djm 2290: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 2291: debug_f("hostkeys file %s does not exist",
2292: options.user_hostfiles[i]);
1.333 djm 2293: continue;
2294: }
1.354 djm 2295: error_fr(r, "hostkeys_foreach failed for %s",
2296: options.user_hostfiles[i]);
1.333 djm 2297: goto out;
2298: }
1.267 djm 2299: }
2300:
1.269 djm 2301: /* Figure out if we have any new keys to add */
1.351 djm 2302: ctx->nnew = ctx->nincomplete = 0;
2303: want = HKF_MATCH_HOST | ( options.check_host_ip ? HKF_MATCH_IP : 0);
1.269 djm 2304: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2305: if (ctx->keys_match[i] == 0)
1.269 djm 2306: ctx->nnew++;
1.351 djm 2307: if ((ctx->keys_match[i] & want) != want)
2308: ctx->nincomplete++;
1.269 djm 2309: }
2310:
1.354 djm 2311: debug3_f("%zu server keys: %zu new, %zu retained, "
2312: "%zu incomplete match. %zu to remove", ctx->nkeys, ctx->nnew,
2313: ctx->nkeys - ctx->nnew - ctx->nincomplete,
1.351 djm 2314: ctx->nincomplete, ctx->nold);
1.269 djm 2315:
1.353 djm 2316: if (ctx->nnew == 0 && ctx->nold == 0) {
1.354 djm 2317: debug_f("no new or deprecated keys from server");
1.353 djm 2318: goto out;
2319: }
2320:
2321: /* Various reasons why we cannot proceed with the update */
2322: if (ctx->complex_hostspec) {
1.354 djm 2323: debug_f("CA/revocation marker, manual host list or wildcard "
2324: "host pattern found, skipping UserKnownHostsFile update");
1.353 djm 2325: goto out;
2326: }
2327: if (ctx->other_name_seen) {
1.354 djm 2328: debug_f("host key found matching a different name/address, "
2329: "skipping UserKnownHostsFile update");
1.347 djm 2330: goto out;
1.352 djm 2331: }
2332: /*
2333: * If removing keys, check whether they appear under different
2334: * names/addresses and refuse to proceed if they do. This avoids
2335: * cases such as hosts with multiple names becoming inconsistent
2336: * with regards to CheckHostIP entries.
2337: * XXX UpdateHostkeys=force to override this (and other) checks?
2338: */
2339: if (ctx->nold != 0) {
2340: if (check_old_keys_othernames(ctx) != 0)
2341: goto out; /* error already logged */
2342: if (ctx->old_key_seen) {
1.354 djm 2343: debug_f("key(s) for %s%s%s exist under other names; "
2344: "skipping UserKnownHostsFile update",
1.352 djm 2345: ctx->host_str, ctx->ip_str == NULL ? "" : ",",
2346: ctx->ip_str == NULL ? "" : ctx->ip_str);
2347: goto out;
2348: }
2349: }
2350:
1.353 djm 2351: if (ctx->nnew == 0) {
1.351 djm 2352: /*
2353: * We have some keys to remove or fix matching for.
2354: * We can proceed to do this without requiring a fresh proof
2355: * from the server.
2356: */
1.269 djm 2357: update_known_hosts(ctx);
1.353 djm 2358: goto out;
2359: }
2360: /*
2361: * We have received previously-unseen keys from the server.
2362: * Ask the server to confirm ownership of the private halves.
2363: */
1.354 djm 2364: debug3_f("asking server to prove ownership for %zu keys", ctx->nnew);
1.353 djm 2365: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2366: (r = sshpkt_put_cstring(ssh,
2367: "hostkeys-prove-00@openssh.com")) != 0 ||
2368: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
1.354 djm 2369: fatal_fr(r, "prepare hostkeys-prove");
1.353 djm 2370: if ((buf = sshbuf_new()) == NULL)
1.354 djm 2371: fatal_f("sshbuf_new");
1.353 djm 2372: for (i = 0; i < ctx->nkeys; i++) {
2373: if (ctx->keys_match[i])
2374: continue;
2375: sshbuf_reset(buf);
2376: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0 ||
1.354 djm 2377: (r = sshpkt_put_stringb(ssh, buf)) != 0)
2378: fatal_fr(r, "assemble hostkeys-prove");
1.269 djm 2379: }
1.353 djm 2380: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2381: fatal_fr(r, "send hostkeys-prove");
1.353 djm 2382: client_register_global_confirm(
2383: client_global_hostkeys_private_confirm, ctx);
2384: ctx = NULL; /* will be freed in callback */
1.269 djm 2385:
1.267 djm 2386: /* Success */
2387: out:
1.269 djm 2388: hostkeys_update_ctx_free(ctx);
1.267 djm 2389: sshkey_free(key);
2390: sshbuf_free(buf);
1.269 djm 2391: /*
2392: * NB. Return success for all cases. The server doesn't need to know
2393: * what the client does with its hosts file.
2394: */
2395: return 1;
1.267 djm 2396: }
2397:
1.264 markus 2398: static int
1.297 markus 2399: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2400: {
2401: char *rtype;
1.320 djm 2402: u_char want_reply;
2403: int r, success = 0;
1.95 markus 2404:
1.320 djm 2405: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
2406: (r = sshpkt_get_u8(ssh, &want_reply)) != 0)
2407: goto out;
1.117 markus 2408: debug("client_input_global_request: rtype %s want_reply %d",
2409: rtype, want_reply);
1.270 djm 2410: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.321 djm 2411: success = client_input_hostkeys(ssh);
1.95 markus 2412: if (want_reply) {
1.320 djm 2413: if ((r = sshpkt_start(ssh, success ? SSH2_MSG_REQUEST_SUCCESS :
2414: SSH2_MSG_REQUEST_FAILURE)) != 0 ||
2415: (r = sshpkt_send(ssh)) != 0 ||
2416: (r = ssh_packet_write_wait(ssh)) != 0)
2417: goto out;
1.95 markus 2418: }
1.320 djm 2419: r = 0;
2420: out:
1.250 djm 2421: free(rtype);
1.320 djm 2422: return r;
1.95 markus 2423: }
1.22 markus 2424:
1.354 djm 2425: static void
2426: client_send_env(struct ssh *ssh, int id, const char *name, const char *val)
2427: {
2428: int r;
2429:
2430: debug("channel %d: setting env %s = \"%s\"", id, name, val);
2431: channel_request_start(ssh, id, "env", 0);
2432: if ((r = sshpkt_put_cstring(ssh, name)) != 0 ||
2433: (r = sshpkt_put_cstring(ssh, val)) != 0 ||
2434: (r = sshpkt_send(ssh)) != 0)
2435: fatal_fr(r, "send setenv");
2436: }
2437:
1.123 djm 2438: void
1.303 djm 2439: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.315 markus 2440: const char *term, struct termios *tiop, int in_fd, struct sshbuf *cmd,
2441: char **env)
1.123 djm 2442: {
1.320 djm 2443: int i, j, matched, len, r;
1.313 djm 2444: char *name, *val;
1.132 djm 2445: Channel *c = NULL;
1.123 djm 2446:
1.354 djm 2447: debug2_f("id %d", id);
1.123 djm 2448:
1.303 djm 2449: if ((c = channel_lookup(ssh, id)) == NULL)
1.354 djm 2450: fatal_f("channel %d: unknown channel", id);
1.224 djm 2451:
1.320 djm 2452: ssh_packet_set_interactive(ssh, want_tty,
1.224 djm 2453: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2454:
1.123 djm 2455: if (want_tty) {
2456: struct winsize ws;
2457:
2458: /* Store window size in the packet. */
1.326 deraadt 2459: if (ioctl(in_fd, TIOCGWINSZ, &ws) == -1)
1.123 djm 2460: memset(&ws, 0, sizeof(ws));
2461:
1.303 djm 2462: channel_request_start(ssh, id, "pty-req", 1);
2463: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.320 djm 2464: if ((r = sshpkt_put_cstring(ssh, term != NULL ? term : ""))
2465: != 0 ||
2466: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 ||
2467: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 ||
2468: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 ||
2469: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0)
1.354 djm 2470: fatal_fr(r, "build pty-req");
1.194 djm 2471: if (tiop == NULL)
2472: tiop = get_saved_tio();
1.316 markus 2473: ssh_tty_make_modes(ssh, -1, tiop);
1.320 djm 2474: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2475: fatal_fr(r, "send pty-req");
1.123 djm 2476: /* XXX wait for reply */
1.132 djm 2477: c->client_tty = 1;
1.123 djm 2478: }
2479:
2480: /* Transfer any environment variables from client to server */
1.126 djm 2481: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2482: debug("Sending environment.");
1.126 djm 2483: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2484: /* Split */
1.126 djm 2485: name = xstrdup(env[i]);
1.123 djm 2486: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2487: free(name);
1.123 djm 2488: continue;
2489: }
2490: *val++ = '\0';
2491:
2492: matched = 0;
2493: for (j = 0; j < options.num_send_env; j++) {
2494: if (match_pattern(name, options.send_env[j])) {
2495: matched = 1;
2496: break;
2497: }
2498: }
2499: if (!matched) {
2500: debug3("Ignored env %s", name);
1.250 djm 2501: free(name);
1.123 djm 2502: continue;
2503: }
1.354 djm 2504: client_send_env(ssh, id, name, val);
1.250 djm 2505: free(name);
1.123 djm 2506: }
1.313 djm 2507: }
2508: for (i = 0; i < options.num_setenv; i++) {
2509: /* Split */
2510: name = xstrdup(options.setenv[i]);
2511: if ((val = strchr(name, '=')) == NULL) {
2512: free(name);
2513: continue;
2514: }
2515: *val++ = '\0';
1.354 djm 2516: client_send_env(ssh, id, name, val);
1.313 djm 2517: free(name);
1.123 djm 2518: }
2519:
1.315 markus 2520: len = sshbuf_len(cmd);
1.123 djm 2521: if (len > 0) {
2522: if (len > 900)
2523: len = 900;
2524: if (want_subsystem) {
1.190 djm 2525: debug("Sending subsystem: %.*s",
1.315 markus 2526: len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2527: channel_request_start(ssh, id, "subsystem", 1);
2528: client_expect_confirm(ssh, id, "subsystem",
2529: CONFIRM_CLOSE);
1.123 djm 2530: } else {
1.190 djm 2531: debug("Sending command: %.*s",
1.315 markus 2532: len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2533: channel_request_start(ssh, id, "exec", 1);
2534: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2535: }
1.320 djm 2536: if ((r = sshpkt_put_stringb(ssh, cmd)) != 0 ||
2537: (r = sshpkt_send(ssh)) != 0)
1.354 djm 2538: fatal_fr(r, "send command");
1.123 djm 2539: } else {
1.303 djm 2540: channel_request_start(ssh, id, "shell", 1);
2541: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.354 djm 2542: if ((r = sshpkt_send(ssh)) != 0)
2543: fatal_fr(r, "send shell");
1.123 djm 2544: }
2545: }
2546:
1.77 itojun 2547: static void
1.321 djm 2548: client_init_dispatch(struct ssh *ssh)
1.16 markus 2549: {
1.321 djm 2550: ssh_dispatch_init(ssh, &dispatch_protocol_error);
1.100 markus 2551:
1.321 djm 2552: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2553: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2554: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2555: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2556: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2557: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2558: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2559: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2560: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2561: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2562: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2563: ssh_dispatch_set(ssh, SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2564:
2565: /* rekeying */
1.321 djm 2566: ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2567:
2568: /* global request reply messages */
1.321 djm 2569: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2570: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2571: }
2572:
2573: void
2574: client_stop_mux(void)
2575: {
2576: if (options.control_path != NULL && muxserver_sock != -1)
2577: unlink(options.control_path);
2578: /*
1.247 dtucker 2579: * If we are in persist mode, or don't have a shell, signal that we
2580: * should close when all active channels are closed.
1.232 djm 2581: */
1.247 dtucker 2582: if (options.control_persist || no_shell_flag) {
1.232 djm 2583: session_closed = 1;
1.235 djm 2584: setproctitle("[stopped mux]");
2585: }
1.113 markus 2586: }
2587:
2588: /* client specific fatal cleanup */
2589: void
1.114 markus 2590: cleanup_exit(int i)
1.113 markus 2591: {
1.233 djm 2592: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.192 djm 2593: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2594: unlink(options.control_path);
1.223 djm 2595: ssh_kill_proxy_command();
1.114 markus 2596: _exit(i);
1.1 deraadt 2597: }
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