Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.357
1.357 ! djm 1: /* $OpenBSD: clientloop.c,v 1.356 2020/12/20 23:36:51 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) {
1.315 markus 691: if ((r = sshbuf_put(c->extended, errmsg,
692: strlen(errmsg))) != 0)
1.354 djm 693: fatal_fr(r, "sshbuf_put");
1.234 djm 694: } else
1.190 djm 695: error("%s", errmsg);
1.234 djm 696: if (cr->action == CONFIRM_TTY) {
697: /*
698: * If a TTY allocation error occurred, then arrange
699: * for the correct TTY to leave raw mode.
700: */
701: if (c->self == session_ident)
702: leave_raw_mode(0);
703: else
1.303 djm 704: mux_tty_alloc_failed(ssh, c);
1.234 djm 705: } else if (cr->action == CONFIRM_CLOSE) {
1.303 djm 706: chan_read_failed(ssh, c);
707: chan_write_failed(ssh, c);
1.190 djm 708: }
709: }
1.250 djm 710: free(cr);
1.190 djm 711: }
712:
713: static void
1.303 djm 714: client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx)
1.190 djm 715: {
1.250 djm 716: free(ctx);
1.190 djm 717: }
1.129 deraadt 718:
1.236 djm 719: void
1.303 djm 720: client_expect_confirm(struct ssh *ssh, int id, const char *request,
1.234 djm 721: enum confirm_action action)
1.190 djm 722: {
1.255 djm 723: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 724:
1.190 djm 725: cr->request_type = request;
1.234 djm 726: cr->action = action;
1.123 djm 727:
1.303 djm 728: channel_register_status_confirm(ssh, id, client_status_confirm,
1.190 djm 729: client_abandon_status_confirm, cr);
1.196 djm 730: }
731:
732: void
733: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
734: {
1.201 djm 735: struct global_confirm *gc, *last_gc;
1.196 djm 736:
737: /* Coalesce identical callbacks */
1.201 djm 738: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
739: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
740: if (++last_gc->ref_count >= INT_MAX)
1.354 djm 741: fatal_f("last_gc->ref_count = %d",
742: last_gc->ref_count);
1.196 djm 743: return;
744: }
745:
1.255 djm 746: gc = xcalloc(1, sizeof(*gc));
1.196 djm 747: gc->cb = cb;
748: gc->ctx = ctx;
749: gc->ref_count = 1;
750: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 751: }
752:
753: static void
1.303 djm 754: process_cmdline(struct ssh *ssh)
1.97 jakob 755: {
756: void (*handler)(int);
1.261 millert 757: char *s, *cmd;
758: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
759: struct Forward fwd;
1.97 jakob 760:
1.257 tedu 761: memset(&fwd, 0, sizeof(fwd));
1.183 djm 762:
1.233 djm 763: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.332 dtucker 764: handler = ssh_signal(SIGINT, SIG_IGN);
1.99 markus 765: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 766: if (s == NULL)
767: goto out;
1.256 deraadt 768: while (isspace((u_char)*s))
1.97 jakob 769: s++;
1.121 djm 770: if (*s == '-')
771: s++; /* Skip cmdline '-', if any */
1.120 dtucker 772: if (*s == '\0')
1.97 jakob 773: goto out;
1.121 djm 774:
1.122 djm 775: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 776: logit("Commands:");
1.164 djm 777: logit(" -L[bind_address:]port:host:hostport "
778: "Request local forward");
779: logit(" -R[bind_address:]port:host:hostport "
780: "Request remote forward");
1.204 stevesk 781: logit(" -D[bind_address:]port "
782: "Request dynamic forward");
1.237 markus 783: logit(" -KL[bind_address:]port "
784: "Cancel local forward");
1.165 stevesk 785: logit(" -KR[bind_address:]port "
1.164 djm 786: "Cancel remote forward");
1.237 markus 787: logit(" -KD[bind_address:]port "
788: "Cancel dynamic forward");
1.146 reyk 789: if (!options.permit_local_command)
790: goto out;
1.164 djm 791: logit(" !args "
792: "Execute local command");
1.146 reyk 793: goto out;
794: }
795:
796: if (*s == '!' && options.permit_local_command) {
797: s++;
798: ssh_local_cmd(s);
1.121 djm 799: goto out;
800: }
801:
802: if (*s == 'K') {
803: delete = 1;
804: s++;
805: }
1.204 stevesk 806: if (*s == 'L')
807: local = 1;
808: else if (*s == 'R')
809: remote = 1;
810: else if (*s == 'D')
811: dynamic = 1;
812: else {
1.109 itojun 813: logit("Invalid command.");
1.97 jakob 814: goto out;
815: }
1.204 stevesk 816:
1.256 deraadt 817: while (isspace((u_char)*++s))
1.179 tedu 818: ;
1.97 jakob 819:
1.217 djm 820: /* XXX update list of forwards in options */
1.121 djm 821: if (delete) {
1.261 millert 822: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
823: if (!parse_forward(&fwd, s, 1, 0)) {
824: logit("Bad forwarding close specification.");
1.121 djm 825: goto out;
826: }
1.237 markus 827: if (remote)
1.303 djm 828: ok = channel_request_rforward_cancel(ssh, &fwd) == 0;
1.237 markus 829: else if (dynamic)
1.303 djm 830: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 831: 0, &options.fwd_opts) > 0;
1.237 markus 832: else
1.303 djm 833: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 834: CHANNEL_CANCEL_PORT_STATIC,
835: &options.fwd_opts) > 0;
1.237 markus 836: if (!ok) {
1.290 dtucker 837: logit("Unknown port forwarding.");
1.237 markus 838: goto out;
839: }
840: logit("Canceled forwarding.");
1.121 djm 841: } else {
1.209 djm 842: if (!parse_forward(&fwd, s, dynamic, remote)) {
1.121 djm 843: logit("Bad forwarding specification.");
844: goto out;
845: }
1.204 stevesk 846: if (local || dynamic) {
1.303 djm 847: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 848: &options.fwd_opts)) {
1.121 djm 849: logit("Port forwarding failed.");
850: goto out;
851: }
1.135 djm 852: } else {
1.303 djm 853: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 854: logit("Port forwarding failed.");
855: goto out;
856: }
1.135 djm 857: }
1.121 djm 858: logit("Forwarding port.");
859: }
860:
1.97 jakob 861: out:
1.332 dtucker 862: ssh_signal(SIGINT, handler);
1.233 djm 863: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 864: free(cmd);
865: free(fwd.listen_host);
1.261 millert 866: free(fwd.listen_path);
1.250 djm 867: free(fwd.connect_host);
1.261 millert 868: free(fwd.connect_path);
1.97 jakob 869: }
870:
1.244 dtucker 871: /* reasons to suppress output of an escape command in help output */
872: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 873: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
874: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
875: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.244 dtucker 876: struct escape_help_text {
877: const char *cmd;
878: const char *text;
879: unsigned int flags;
880: };
881: static struct escape_help_text esc_txt[] = {
882: {".", "terminate session", SUPPRESS_MUXMASTER},
883: {".", "terminate connection (and any multiplexed sessions)",
884: SUPPRESS_MUXCLIENT},
1.292 djm 885: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.244 dtucker 886: {"C", "open a command line", SUPPRESS_MUXCLIENT},
1.292 djm 887: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 888: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 889: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
890: {"#", "list forwarded connections", SUPPRESS_NEVER},
891: {"&", "background ssh (when waiting for connections to terminate)",
892: SUPPRESS_MUXCLIENT},
893: {"?", "this message", SUPPRESS_NEVER},
894: };
895:
896: static void
1.315 markus 897: print_escape_help(struct sshbuf *b, int escape_char, int mux_client,
898: int using_stderr)
1.244 dtucker 899: {
900: unsigned int i, suppress_flags;
1.315 markus 901: int r;
1.244 dtucker 902:
1.315 markus 903: if ((r = sshbuf_putf(b,
904: "%c?\r\nSupported escape sequences:\r\n", escape_char)) != 0)
1.354 djm 905: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 906:
1.292 djm 907: suppress_flags =
1.244 dtucker 908: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
909: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
910: (using_stderr ? 0 : SUPPRESS_SYSLOG);
911:
912: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
913: if (esc_txt[i].flags & suppress_flags)
914: continue;
1.315 markus 915: if ((r = sshbuf_putf(b, " %c%-3s - %s\r\n",
916: escape_char, esc_txt[i].cmd, esc_txt[i].text)) != 0)
1.354 djm 917: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 918: }
919:
1.315 markus 920: if ((r = sshbuf_putf(b,
1.246 dtucker 921: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 922: "(Note that escapes are only recognized immediately after "
1.315 markus 923: "newline.)\r\n", escape_char, escape_char)) != 0)
1.354 djm 924: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 925: }
926:
1.314 djm 927: /*
1.296 naddy 928: * Process the characters one by one.
1.195 djm 929: */
1.77 itojun 930: static int
1.303 djm 931: process_escapes(struct ssh *ssh, Channel *c,
1.315 markus 932: struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr,
1.195 djm 933: char *buf, int len)
1.31 markus 934: {
935: pid_t pid;
1.315 markus 936: int r, bytes = 0;
1.42 markus 937: u_int i;
938: u_char ch;
1.31 markus 939: char *s;
1.294 djm 940: struct escape_filter_ctx *efc = c->filter_ctx == NULL ?
941: NULL : (struct escape_filter_ctx *)c->filter_ctx;
1.31 markus 942:
1.294 djm 943: if (c->filter_ctx == NULL)
944: return 0;
1.314 djm 945:
1.139 djm 946: if (len <= 0)
947: return (0);
948:
949: for (i = 0; i < (u_int)len; i++) {
1.31 markus 950: /* Get one character at a time. */
951: ch = buf[i];
952:
1.294 djm 953: if (efc->escape_pending) {
1.31 markus 954: /* We have previously seen an escape character. */
955: /* Clear the flag now. */
1.294 djm 956: efc->escape_pending = 0;
1.31 markus 957:
958: /* Process the escaped character. */
959: switch (ch) {
960: case '.':
961: /* Terminate the connection. */
1.315 markus 962: if ((r = sshbuf_putf(berr, "%c.\r\n",
963: efc->escape_char)) != 0)
1.354 djm 964: fatal_fr(r, "sshbuf_putf");
1.217 djm 965: if (c && c->ctl_chan != -1) {
1.303 djm 966: chan_read_failed(ssh, c);
967: chan_write_failed(ssh, c);
968: if (c->detach_user) {
969: c->detach_user(ssh,
970: c->self, NULL);
971: }
1.253 dtucker 972: c->type = SSH_CHANNEL_ABANDONED;
1.315 markus 973: sshbuf_reset(c->input);
1.303 djm 974: chan_ibuf_empty(ssh, c);
1.195 djm 975: return 0;
976: } else
977: quit_pending = 1;
1.31 markus 978: return -1;
979:
980: case 'Z' - 64:
1.195 djm 981: /* XXX support this for mux clients */
1.217 djm 982: if (c && c->ctl_chan != -1) {
1.245 dtucker 983: char b[16];
1.195 djm 984: noescape:
1.245 dtucker 985: if (ch == 'Z' - 64)
986: snprintf(b, sizeof b, "^Z");
987: else
988: snprintf(b, sizeof b, "%c", ch);
1.315 markus 989: if ((r = sshbuf_putf(berr,
1.245 dtucker 990: "%c%s escape not available to "
1.195 djm 991: "multiplexed sessions\r\n",
1.315 markus 992: efc->escape_char, b)) != 0)
1.354 djm 993: fatal_fr(r, "sshbuf_putf");
1.195 djm 994: continue;
995: }
1.197 djm 996: /* Suspend the program. Inform the user */
1.315 markus 997: if ((r = sshbuf_putf(berr,
998: "%c^Z [suspend ssh]\r\n",
999: efc->escape_char)) != 0)
1.354 djm 1000: fatal_fr(r, "sshbuf_putf");
1.31 markus 1001:
1002: /* Restore terminal modes and suspend. */
1003: client_suspend_self(bin, bout, berr);
1004:
1005: /* We have been continued. */
1006: continue;
1007:
1.111 markus 1008: case 'B':
1.315 markus 1009: if ((r = sshbuf_putf(berr,
1010: "%cB\r\n", efc->escape_char)) != 0)
1.354 djm 1011: fatal_fr(r, "sshbuf_putf");
1.303 djm 1012: channel_request_start(ssh, c->self, "break", 0);
1.315 markus 1013: if ((r = sshpkt_put_u32(ssh, 1000)) != 0 ||
1014: (r = sshpkt_send(ssh)) != 0)
1.354 djm 1015: fatal_fr(r, "send packet");
1.111 markus 1016: continue;
1017:
1.54 markus 1018: case 'R':
1.357 ! djm 1019: if (ssh->compat & SSH_BUG_NOREKEY)
1.292 djm 1020: logit("Server does not "
1021: "support re-keying");
1022: else
1023: need_rekeying = 1;
1.54 markus 1024: continue;
1025:
1.242 dtucker 1026: case 'V':
1027: /* FALLTHROUGH */
1028: case 'v':
1029: if (c && c->ctl_chan != -1)
1030: goto noescape;
1031: if (!log_is_on_stderr()) {
1.315 markus 1032: if ((r = sshbuf_putf(berr,
1.242 dtucker 1033: "%c%c [Logging to syslog]\r\n",
1.315 markus 1034: efc->escape_char, ch)) != 0)
1.354 djm 1035: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1036: continue;
1037: }
1038: if (ch == 'V' && options.log_level >
1039: SYSLOG_LEVEL_QUIET)
1040: log_change_level(--options.log_level);
1041: if (ch == 'v' && options.log_level <
1042: SYSLOG_LEVEL_DEBUG3)
1043: log_change_level(++options.log_level);
1.315 markus 1044: if ((r = sshbuf_putf(berr,
1.294 djm 1045: "%c%c [LogLevel %s]\r\n",
1046: efc->escape_char, ch,
1.315 markus 1047: log_level_name(options.log_level))) != 0)
1.354 djm 1048: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1049: continue;
1050:
1.31 markus 1051: case '&':
1.217 djm 1052: if (c && c->ctl_chan != -1)
1.195 djm 1053: goto noescape;
1.31 markus 1054: /*
1.197 djm 1055: * Detach the program (continue to serve
1056: * connections, but put in background and no
1057: * more new connections).
1.31 markus 1058: */
1059: /* Restore tty modes. */
1.233 djm 1060: leave_raw_mode(
1061: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1062:
1063: /* Stop listening for new connections. */
1.303 djm 1064: channel_stop_listening(ssh);
1.31 markus 1065:
1.354 djm 1066: if ((r = sshbuf_putf(berr, "%c& "
1067: "[backgrounded]\n", efc->escape_char)) != 0)
1068: fatal_fr(r, "sshbuf_putf");
1.31 markus 1069:
1070: /* Fork into background. */
1071: pid = fork();
1.326 deraadt 1072: if (pid == -1) {
1.31 markus 1073: error("fork: %.100s", strerror(errno));
1074: continue;
1075: }
1076: if (pid != 0) { /* This is the parent. */
1077: /* The parent just exits. */
1078: exit(0);
1079: }
1080: /* The child continues serving connections. */
1.292 djm 1081: /* fake EOF on stdin */
1.315 markus 1082: if ((r = sshbuf_put_u8(bin, 4)) != 0)
1.354 djm 1083: fatal_fr(r, "sshbuf_put_u8");
1.292 djm 1084: return -1;
1.31 markus 1085: case '?':
1.294 djm 1086: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1087: (c && c->ctl_chan != -1),
1088: log_is_on_stderr());
1.31 markus 1089: continue;
1090:
1091: case '#':
1.315 markus 1092: if ((r = sshbuf_putf(berr, "%c#\r\n",
1093: efc->escape_char)) != 0)
1.354 djm 1094: fatal_fr(r, "sshbuf_putf");
1.303 djm 1095: s = channel_open_message(ssh);
1.315 markus 1096: if ((r = sshbuf_put(berr, s, strlen(s))) != 0)
1.354 djm 1097: fatal_fr(r, "sshbuf_put");
1.250 djm 1098: free(s);
1.97 jakob 1099: continue;
1100:
1101: case 'C':
1.217 djm 1102: if (c && c->ctl_chan != -1)
1.206 djm 1103: goto noescape;
1.303 djm 1104: process_cmdline(ssh);
1.31 markus 1105: continue;
1106:
1107: default:
1.294 djm 1108: if (ch != efc->escape_char) {
1.315 markus 1109: if ((r = sshbuf_put_u8(bin,
1110: efc->escape_char)) != 0)
1.354 djm 1111: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1112: bytes++;
1113: }
1114: /* Escaped characters fall through here */
1115: break;
1116: }
1117: } else {
1118: /*
1.197 djm 1119: * The previous character was not an escape char.
1120: * Check if this is an escape.
1.31 markus 1121: */
1.294 djm 1122: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1123: /*
1124: * It is. Set the flag and continue to
1125: * next character.
1126: */
1.294 djm 1127: efc->escape_pending = 1;
1.31 markus 1128: continue;
1129: }
1130: }
1131:
1132: /*
1133: * Normal character. Record whether it was a newline,
1134: * and append it to the buffer.
1135: */
1136: last_was_cr = (ch == '\r' || ch == '\n');
1.315 markus 1137: if ((r = sshbuf_put_u8(bin, ch)) != 0)
1.354 djm 1138: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1139: bytes++;
1140: }
1141: return bytes;
1142: }
1143:
1.13 markus 1144: /*
1.15 markus 1145: * Get packets from the connection input buffer, and process them as long as
1146: * there are packets available.
1147: *
1148: * Any unknown packets received during the actual
1149: * session cause the session to terminate. This is
1150: * intended to make debugging easier since no
1151: * confirmations are sent. Any compatible protocol
1152: * extensions must be negotiated during the
1153: * preparatory phase.
1154: */
1155:
1.77 itojun 1156: static void
1.321 djm 1157: client_process_buffered_input_packets(struct ssh *ssh)
1.15 markus 1158: {
1.321 djm 1159: ssh_dispatch_run_fatal(ssh, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1160: }
1161:
1.31 markus 1162: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1163:
1.195 djm 1164: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1165: void *
1166: client_new_escape_filter_ctx(int escape_char)
1167: {
1168: struct escape_filter_ctx *ret;
1169:
1.255 djm 1170: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1171: ret->escape_pending = 0;
1172: ret->escape_char = escape_char;
1173: return (void *)ret;
1174: }
1175:
1.198 djm 1176: /* Free the escape filter context on channel free */
1177: void
1.303 djm 1178: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1179: {
1.250 djm 1180: free(ctx);
1.198 djm 1181: }
1182:
1.195 djm 1183: int
1.303 djm 1184: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1185: {
1.190 djm 1186: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1187: return 0;
1188:
1.303 djm 1189: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1190: buf, len);
1.30 markus 1191: }
1192:
1.77 itojun 1193: static void
1.303 djm 1194: client_channel_closed(struct ssh *ssh, int id, void *arg)
1.60 markus 1195: {
1.303 djm 1196: channel_cancel_cleanup(ssh, id);
1.60 markus 1197: session_closed = 1;
1.233 djm 1198: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1199: }
1200:
1.15 markus 1201: /*
1.13 markus 1202: * Implements the interactive session with the server. This is called after
1203: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1204: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1205: * used as an escape character for terminating or suspending the session.
1.13 markus 1206: */
1.20 markus 1207: int
1.303 djm 1208: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1209: int ssh2_chan_id)
1.1 deraadt 1210: {
1.46 markus 1211: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1212: double start_time, total_time;
1.284 djm 1213: int r, max_fd = 0, max_fd2 = 0, len;
1.200 markus 1214: u_int64_t ibytes, obytes;
1.130 avsm 1215: u_int nalloc = 0;
1.11 markus 1216:
1217: debug("Entering interactive session.");
1.277 semarie 1218:
1.278 semarie 1219: if (options.control_master &&
1.286 djm 1220: !option_clear_or_none(options.control_path)) {
1.278 semarie 1221: debug("pledge: id");
1.327 mestre 1222: if (pledge("stdio rpath wpath cpath unix inet dns recvfd sendfd proc exec id tty",
1.278 semarie 1223: NULL) == -1)
1.354 djm 1224: fatal_f("pledge(): %s", strerror(errno));
1.278 semarie 1225:
1226: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1227: debug("pledge: exec");
1228: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1229: NULL) == -1)
1.354 djm 1230: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1231:
1232: } else if (options.update_hostkeys) {
1233: debug("pledge: filesystem full");
1234: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1235: NULL) == -1)
1.354 djm 1236: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1237:
1.286 djm 1238: } else if (!option_clear_or_none(options.proxy_command) ||
1239: fork_after_authentication_flag) {
1.277 semarie 1240: debug("pledge: proc");
1241: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1.354 djm 1242: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1243:
1244: } else {
1245: debug("pledge: network");
1.300 mestre 1246: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.354 djm 1247: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1248: }
1.11 markus 1249:
1.307 dtucker 1250: start_time = monotime_double();
1.11 markus 1251:
1252: /* Initialize variables. */
1253: last_was_cr = 1;
1254: exit_status = -1;
1.320 djm 1255: connection_in = ssh_packet_get_connection_in(ssh);
1256: connection_out = ssh_packet_get_connection_out(ssh);
1.287 deraadt 1257: max_fd = MAXIMUM(connection_in, connection_out);
1.46 markus 1258:
1.11 markus 1259: quit_pending = 0;
1260:
1.315 markus 1261: /* Initialize buffer. */
1262: if ((stderr_buffer = sshbuf_new()) == NULL)
1.354 djm 1263: fatal_f("sshbuf_new failed");
1.11 markus 1264:
1.321 djm 1265: client_init_dispatch(ssh);
1.15 markus 1266:
1.105 markus 1267: /*
1268: * Set signal handlers, (e.g. to restore non-blocking mode)
1269: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1270: */
1.332 dtucker 1271: if (ssh_signal(SIGHUP, SIG_IGN) != SIG_IGN)
1272: ssh_signal(SIGHUP, signal_handler);
1273: if (ssh_signal(SIGINT, SIG_IGN) != SIG_IGN)
1274: ssh_signal(SIGINT, signal_handler);
1275: if (ssh_signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1276: ssh_signal(SIGQUIT, signal_handler);
1277: if (ssh_signal(SIGTERM, SIG_IGN) != SIG_IGN)
1278: ssh_signal(SIGTERM, signal_handler);
1279: ssh_signal(SIGWINCH, window_change_handler);
1.11 markus 1280:
1281: if (have_pty)
1.233 djm 1282: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1283:
1.292 djm 1284: session_ident = ssh2_chan_id;
1285: if (session_ident != -1) {
1286: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1287: channel_register_filter(ssh, session_ident,
1.292 djm 1288: client_simple_escape_filter, NULL,
1289: client_filter_cleanup,
1290: client_new_escape_filter_ctx(
1291: escape_char_arg));
1.232 djm 1292: }
1.303 djm 1293: channel_register_cleanup(ssh, session_ident,
1.292 djm 1294: client_channel_closed, 0);
1.48 markus 1295: }
1.345 dtucker 1296:
1297: schedule_server_alive_check();
1.30 markus 1298:
1.11 markus 1299: /* Main loop of the client for the interactive session mode. */
1300: while (!quit_pending) {
1301:
1.13 markus 1302: /* Process buffered packets sent by the server. */
1.321 djm 1303: client_process_buffered_input_packets(ssh);
1.11 markus 1304:
1.303 djm 1305: if (session_closed && !channel_still_open(ssh))
1.60 markus 1306: break;
1307:
1.303 djm 1308: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1309: debug("rekeying in progress");
1.284 djm 1310: } else if (need_rekeying) {
1311: /* manual rekey request */
1312: debug("need rekeying");
1.303 djm 1313: if ((r = kex_start_rekex(ssh)) != 0)
1.354 djm 1314: fatal_fr(r, "kex_start_rekex");
1.284 djm 1315: need_rekeying = 0;
1.56 markus 1316: } else {
1317: /*
1318: * Make packets from buffered channel data, and
1319: * enqueue them for sending to the server.
1320: */
1.320 djm 1321: if (ssh_packet_not_very_much_data_to_write(ssh))
1.303 djm 1322: channel_output_poll(ssh);
1.11 markus 1323:
1.56 markus 1324: /*
1325: * Check if the window size has changed, and buffer a
1326: * message about it to the server if so.
1327: */
1.303 djm 1328: client_check_window_change(ssh);
1.11 markus 1329:
1.56 markus 1330: if (quit_pending)
1331: break;
1332: }
1.13 markus 1333: /*
1334: * Wait until we have something to do (something becomes
1335: * available on one of the descriptors).
1336: */
1.81 markus 1337: max_fd2 = max_fd;
1.303 djm 1338: client_wait_until_can_do_something(ssh, &readset, &writeset,
1339: &max_fd2, &nalloc, ssh_packet_is_rekeying(ssh));
1.11 markus 1340:
1341: if (quit_pending)
1342: break;
1343:
1.56 markus 1344: /* Do channel operations unless rekeying in progress. */
1.303 djm 1345: if (!ssh_packet_is_rekeying(ssh))
1346: channel_after_select(ssh, readset, writeset);
1.11 markus 1347:
1.17 markus 1348: /* Buffer input from the connection. */
1.320 djm 1349: client_process_net_input(ssh, readset);
1.17 markus 1350:
1351: if (quit_pending)
1352: break;
1.11 markus 1353:
1.197 djm 1354: /*
1355: * Send as much buffered packet data as possible to the
1356: * sender.
1357: */
1.338 djm 1358: if (FD_ISSET(connection_out, writeset)) {
1359: if ((r = ssh_packet_write_poll(ssh)) != 0) {
1360: sshpkt_fatal(ssh, r,
1361: "%s: ssh_packet_write_poll", __func__);
1362: }
1363: }
1.222 djm 1364:
1365: /*
1366: * If we are a backgrounded control master, and the
1367: * timeout has expired without any active client
1368: * connections, then quit.
1369: */
1370: if (control_persist_exit_time > 0) {
1.251 dtucker 1371: if (monotime() >= control_persist_exit_time) {
1.222 djm 1372: debug("ControlPersist timeout expired");
1373: break;
1374: }
1375: }
1.11 markus 1376: }
1.250 djm 1377: free(readset);
1378: free(writeset);
1.11 markus 1379:
1380: /* Terminate the session. */
1381:
1382: /* Stop watching for window change. */
1.332 dtucker 1383: ssh_signal(SIGWINCH, SIG_DFL);
1.211 andreas 1384:
1.320 djm 1385: if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
1386: (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_BY_APPLICATION)) != 0 ||
1387: (r = sshpkt_put_cstring(ssh, "disconnected by user")) != 0 ||
1388: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* language tag */
1389: (r = sshpkt_send(ssh)) != 0 ||
1390: (r = ssh_packet_write_wait(ssh)) != 0)
1.354 djm 1391: fatal_fr(r, "send disconnect");
1.11 markus 1392:
1.303 djm 1393: channel_free_all(ssh);
1.11 markus 1394:
1.75 markus 1395: if (have_pty)
1.233 djm 1396: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.75 markus 1397:
1398: /* restore blocking io */
1399: if (!isatty(fileno(stdin)))
1400: unset_nonblock(fileno(stdin));
1401: if (!isatty(fileno(stdout)))
1402: unset_nonblock(fileno(stdout));
1403: if (!isatty(fileno(stderr)))
1404: unset_nonblock(fileno(stderr));
1.116 dtucker 1405:
1406: /*
1407: * If there was no shell or command requested, there will be no remote
1408: * exit status to be returned. In that case, clear error code if the
1409: * connection was deliberately terminated at this end.
1410: */
1411: if (no_shell_flag && received_signal == SIGTERM) {
1412: received_signal = 0;
1413: exit_status = 0;
1414: }
1.75 markus 1415:
1.301 dtucker 1416: if (received_signal) {
1417: verbose("Killed by signal %d.", (int) received_signal);
1418: cleanup_exit(0);
1419: }
1.75 markus 1420:
1.13 markus 1421: /*
1422: * In interactive mode (with pseudo tty) display a message indicating
1423: * that the connection has been closed.
1424: */
1.11 markus 1425: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1.315 markus 1426: if ((r = sshbuf_putf(stderr_buffer,
1427: "Connection to %.64s closed.\r\n", host)) != 0)
1.354 djm 1428: fatal_fr(r, "sshbuf_putf");
1.11 markus 1429: }
1.70 markus 1430:
1.11 markus 1431: /* Output any buffered data for stderr. */
1.315 markus 1432: if (sshbuf_len(stderr_buffer) > 0) {
1.230 djm 1433: len = atomicio(vwrite, fileno(stderr),
1.315 markus 1434: (u_char *)sshbuf_ptr(stderr_buffer),
1435: sshbuf_len(stderr_buffer));
1436: if (len < 0 || (u_int)len != sshbuf_len(stderr_buffer))
1.11 markus 1437: error("Write failed flushing stderr buffer.");
1.315 markus 1438: else if ((r = sshbuf_consume(stderr_buffer, len)) != 0)
1.354 djm 1439: fatal_fr(r, "sshbuf_consume");
1.11 markus 1440: }
1441:
1442: /* Clear and free any buffers. */
1.315 markus 1443: sshbuf_free(stderr_buffer);
1.11 markus 1444:
1445: /* Report bytes transferred, and transfer rates. */
1.307 dtucker 1446: total_time = monotime_double() - start_time;
1.320 djm 1447: ssh_packet_get_bytes(ssh, &ibytes, &obytes);
1.200 markus 1448: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1449: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1450: if (total_time > 0)
1.200 markus 1451: verbose("Bytes per second: sent %.1f, received %.1f",
1452: obytes / total_time, ibytes / total_time);
1.11 markus 1453: /* Return the exit status of the program. */
1454: debug("Exit status %d", exit_status);
1455: return exit_status;
1.15 markus 1456: }
1457:
1458: /*********/
1459:
1.77 itojun 1460: static Channel *
1.303 djm 1461: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1462: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1463: {
1.103 deraadt 1464: Channel *c = NULL;
1.289 markus 1465: struct sshbuf *b = NULL;
1.40 markus 1466: char *listen_address, *originator_address;
1.320 djm 1467: u_int listen_port, originator_port;
1.289 markus 1468: int r;
1.40 markus 1469:
1470: /* Get rest of the packet */
1.320 djm 1471: if ((r = sshpkt_get_cstring(ssh, &listen_address, NULL)) != 0 ||
1472: (r = sshpkt_get_u32(ssh, &listen_port)) != 0 ||
1473: (r = sshpkt_get_cstring(ssh, &originator_address, NULL)) != 0 ||
1474: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1475: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1476: fatal_fr(r, "parse packet");
1.40 markus 1477:
1.354 djm 1478: debug_f("listen %s port %d, originator %s port %d",
1.261 millert 1479: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1480:
1.320 djm 1481: if (listen_port > 0xffff)
1.354 djm 1482: error_f("invalid listen port");
1.320 djm 1483: else if (originator_port > 0xffff)
1.354 djm 1484: error_f("invalid originator port");
1.320 djm 1485: else {
1486: c = channel_connect_by_listen_address(ssh,
1487: listen_address, listen_port, "forwarded-tcpip",
1488: originator_address);
1489: }
1.40 markus 1490:
1.289 markus 1491: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1492: if ((b = sshbuf_new()) == NULL) {
1.354 djm 1493: error_f("alloc reply");
1.289 markus 1494: goto out;
1495: }
1496: /* reconstruct and send to muxclient */
1497: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1498: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1499: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1500: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1501: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1502: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1503: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1504: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1505: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1506: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1507: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.354 djm 1508: error_fr(r, "compose for muxclient");
1.289 markus 1509: goto out;
1510: }
1511: }
1512:
1513: out:
1514: sshbuf_free(b);
1.250 djm 1515: free(originator_address);
1516: free(listen_address);
1.40 markus 1517: return c;
1518: }
1519:
1.103 deraadt 1520: static Channel *
1.303 djm 1521: client_request_forwarded_streamlocal(struct ssh *ssh,
1522: const char *request_type, int rchan)
1.261 millert 1523: {
1524: Channel *c = NULL;
1525: char *listen_path;
1.320 djm 1526: int r;
1.261 millert 1527:
1528: /* Get the remote path. */
1.320 djm 1529: if ((r = sshpkt_get_cstring(ssh, &listen_path, NULL)) != 0 ||
1530: (r = sshpkt_get_string(ssh, NULL, NULL)) != 0 || /* reserved */
1531: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1532: fatal_fr(r, "parse packet");
1.261 millert 1533:
1.354 djm 1534: debug_f("request: %s", listen_path);
1.261 millert 1535:
1.303 djm 1536: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1537: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1538: free(listen_path);
1539: return c;
1540: }
1541:
1542: static Channel *
1.303 djm 1543: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1544: {
1545: Channel *c = NULL;
1546: char *originator;
1.321 djm 1547: u_int originator_port;
1.320 djm 1548: int r, sock;
1.40 markus 1549:
1550: if (!options.forward_x11) {
1551: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1552: error("Warning: this is probably a break-in attempt by a "
1553: "malicious server.");
1.221 djm 1554: return NULL;
1555: }
1.274 djm 1556: if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
1.221 djm 1557: verbose("Rejected X11 connection after ForwardX11Timeout "
1558: "expired");
1.40 markus 1559: return NULL;
1560: }
1.320 djm 1561: if ((r = sshpkt_get_cstring(ssh, &originator, NULL)) != 0 ||
1.321 djm 1562: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1.320 djm 1563: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1564: fatal_fr(r, "parse packet");
1.40 markus 1565: /* XXX check permission */
1.321 djm 1566: /* XXX range check originator port? */
1567: debug("client_request_x11: request from %s %u", originator,
1.47 markus 1568: originator_port);
1.250 djm 1569: free(originator);
1.303 djm 1570: sock = x11_connect_display(ssh);
1.67 markus 1571: if (sock < 0)
1572: return NULL;
1.303 djm 1573: c = channel_new(ssh, "x11",
1.67 markus 1574: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1575: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1576: c->force_drain = 1;
1.40 markus 1577: return c;
1578: }
1579:
1.103 deraadt 1580: static Channel *
1.303 djm 1581: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1582: {
1583: Channel *c = NULL;
1.262 djm 1584: int r, sock;
1.40 markus 1585:
1586: if (!options.forward_agent) {
1587: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1588: error("Warning: this is probably a break-in attempt by a "
1589: "malicious server.");
1.40 markus 1590: return NULL;
1591: }
1.330 djm 1592: if (forward_agent_sock_path == NULL) {
1593: r = ssh_get_authentication_socket(&sock);
1594: } else {
1595: r = ssh_get_authentication_socket_path(forward_agent_sock_path, &sock);
1596: }
1597: if (r != 0) {
1.262 djm 1598: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.354 djm 1599: debug_fr(r, "ssh_get_authentication_socket");
1.67 markus 1600: return NULL;
1.262 djm 1601: }
1.303 djm 1602: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1603: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1604: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1605: "authentication agent connection", 1);
1.82 markus 1606: c->force_drain = 1;
1.40 markus 1607: return c;
1.180 djm 1608: }
1609:
1.306 djm 1610: char *
1.303 djm 1611: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1.343 djm 1612: int local_tun, int remote_tun, channel_open_fn *cb, void *cbctx)
1.180 djm 1613: {
1614: Channel *c;
1.320 djm 1615: int r, fd;
1.306 djm 1616: char *ifname = NULL;
1.180 djm 1617:
1618: if (tun_mode == SSH_TUNMODE_NO)
1619: return 0;
1620:
1621: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1622:
1623: /* Open local tunnel device */
1.306 djm 1624: if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) {
1.180 djm 1625: error("Tunnel device open failed.");
1.306 djm 1626: return NULL;
1.180 djm 1627: }
1.306 djm 1628: debug("Tunnel forwarding using interface %s", ifname);
1.180 djm 1629:
1.303 djm 1630: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1631: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1632: c->datagram = 1;
1.343 djm 1633:
1634: if (cb != NULL)
1635: channel_register_open_confirm(ssh, c->self, cb, cbctx);
1.180 djm 1636:
1.320 djm 1637: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1638: (r = sshpkt_put_cstring(ssh, "tun@openssh.com")) != 0 ||
1639: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1640: (r = sshpkt_put_u32(ssh, c->local_window_max)) != 0 ||
1641: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1642: (r = sshpkt_put_u32(ssh, tun_mode)) != 0 ||
1643: (r = sshpkt_put_u32(ssh, remote_tun)) != 0 ||
1644: (r = sshpkt_send(ssh)) != 0)
1.321 djm 1645: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.180 djm 1646:
1.306 djm 1647: return ifname;
1.40 markus 1648: }
1649:
1.22 markus 1650: /* XXXX move to generic input handler */
1.264 markus 1651: static int
1.297 markus 1652: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1653: {
1654: Channel *c = NULL;
1.320 djm 1655: char *ctype = NULL;
1656: int r;
1657: u_int rchan;
1658: size_t len;
1659: u_int rmaxpack, rwindow;
1660:
1661: if ((r = sshpkt_get_cstring(ssh, &ctype, &len)) != 0 ||
1662: (r = sshpkt_get_u32(ssh, &rchan)) != 0 ||
1663: (r = sshpkt_get_u32(ssh, &rwindow)) != 0 ||
1664: (r = sshpkt_get_u32(ssh, &rmaxpack)) != 0)
1665: goto out;
1.22 markus 1666:
1.24 markus 1667: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1668: ctype, rchan, rwindow, rmaxpack);
1669:
1.40 markus 1670: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1671: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1672: rmaxpack);
1.261 millert 1673: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1674: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1675: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1676: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1677: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1678: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1679: }
1.289 markus 1680: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1681: debug3("proxied to downstream: %s", ctype);
1682: } else if (c != NULL) {
1.22 markus 1683: debug("confirm %s", ctype);
1684: c->remote_id = rchan;
1.304 djm 1685: c->have_remote_id = 1;
1.22 markus 1686: c->remote_window = rwindow;
1687: c->remote_maxpacket = rmaxpack;
1.69 markus 1688: if (c->type != SSH_CHANNEL_CONNECTING) {
1.320 djm 1689: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
1690: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1691: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1692: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1693: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1694: (r = sshpkt_send(ssh)) != 0)
1695: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.69 markus 1696: }
1.22 markus 1697: } else {
1698: debug("failure %s", ctype);
1.320 djm 1699: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE)) != 0 ||
1700: (r = sshpkt_put_u32(ssh, rchan)) != 0 ||
1701: (r = sshpkt_put_u32(ssh, SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED)) != 0 ||
1702: (r = sshpkt_put_cstring(ssh, "open failed")) != 0 ||
1703: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
1704: (r = sshpkt_send(ssh)) != 0)
1705: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.22 markus 1706: }
1.320 djm 1707: r = 0;
1708: out:
1.250 djm 1709: free(ctype);
1.320 djm 1710: return r;
1.22 markus 1711: }
1.267 djm 1712:
1.264 markus 1713: static int
1.297 markus 1714: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1715: {
1716: Channel *c = NULL;
1.320 djm 1717: char *rtype = NULL;
1718: u_char reply;
1719: u_int id, exitval;
1720: int r, success = 0;
1721:
1722: if ((r = sshpkt_get_u32(ssh, &id)) != 0)
1723: return r;
1724: if (id <= INT_MAX)
1725: c = channel_lookup(ssh, id);
1.297 markus 1726: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1727: return 0;
1.320 djm 1728: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
1729: (r = sshpkt_get_u8(ssh, &reply)) != 0)
1730: goto out;
1.48 markus 1731:
1.320 djm 1732: debug("client_input_channel_req: channel %u rtype %s reply %d",
1.48 markus 1733: id, rtype, reply);
1734:
1.320 djm 1735: if (c == NULL) {
1.197 djm 1736: error("client_input_channel_req: channel %d: "
1737: "unknown channel", id);
1.193 markus 1738: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1.320 djm 1739: if ((r = sshpkt_get_end(ssh)) != 0)
1740: goto out;
1.303 djm 1741: chan_rcvd_eow(ssh, c);
1.48 markus 1742: } else if (strcmp(rtype, "exit-status") == 0) {
1.320 djm 1743: if ((r = sshpkt_get_u32(ssh, &exitval)) != 0)
1744: goto out;
1.217 djm 1745: if (c->ctl_chan != -1) {
1.303 djm 1746: mux_exit_message(ssh, c, exitval);
1.215 djm 1747: success = 1;
1.320 djm 1748: } else if ((int)id == session_ident) {
1.215 djm 1749: /* Record exit value of local session */
1.123 djm 1750: success = 1;
1751: exit_status = exitval;
1.215 djm 1752: } else {
1.218 djm 1753: /* Probably for a mux channel that has already closed */
1.354 djm 1754: debug_f("no sink for exit-status on channel %d",
1755: id);
1.123 djm 1756: }
1.320 djm 1757: if ((r = sshpkt_get_end(ssh)) != 0)
1758: goto out;
1.48 markus 1759: }
1.259 djm 1760: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1761: if (!c->have_remote_id)
1.354 djm 1762: fatal_f("channel %d: no remote_id", c->self);
1.320 djm 1763: if ((r = sshpkt_start(ssh, success ?
1764: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE)) != 0 ||
1765: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1766: (r = sshpkt_send(ssh)) != 0)
1767: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.48 markus 1768: }
1.320 djm 1769: r = 0;
1770: out:
1.250 djm 1771: free(rtype);
1.320 djm 1772: return r;
1.48 markus 1773: }
1.267 djm 1774:
1.269 djm 1775: struct hostkeys_update_ctx {
1776: /* The hostname and (optionally) IP address string for the server */
1777: char *host_str, *ip_str;
1778:
1779: /*
1780: * Keys received from the server and a flag for each indicating
1781: * whether they already exist in known_hosts.
1.351 djm 1782: * keys_match is filled in by hostkeys_find() and later (for new
1.269 djm 1783: * keys) by client_global_hostkeys_private_confirm().
1784: */
1785: struct sshkey **keys;
1.351 djm 1786: u_int *keys_match; /* mask of HKF_MATCH_* from hostfile.h */
1787: int *keys_verified; /* flag for new keys verified by server */
1788: size_t nkeys, nnew, nincomplete; /* total, new keys, incomplete match */
1.269 djm 1789:
1790: /*
1791: * Keys that are in known_hosts, but were not present in the update
1792: * from the server (i.e. scheduled to be deleted).
1793: * Filled in by hostkeys_find().
1794: */
1795: struct sshkey **old_keys;
1796: size_t nold;
1.347 djm 1797:
1798: /* Various special cases. */
1.350 djm 1799: int complex_hostspec; /* wildcard or manual pattern-list host name */
1.347 djm 1800: int ca_available; /* saw CA key for this host */
1.352 djm 1801: int old_key_seen; /* saw old key with other name/addr */
1.353 djm 1802: int other_name_seen; /* saw key with other name/addr */
1.269 djm 1803: };
1804:
1805: static void
1806: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1807: {
1808: size_t i;
1809:
1810: if (ctx == NULL)
1811: return;
1812: for (i = 0; i < ctx->nkeys; i++)
1813: sshkey_free(ctx->keys[i]);
1814: free(ctx->keys);
1.351 djm 1815: free(ctx->keys_match);
1816: free(ctx->keys_verified);
1.269 djm 1817: for (i = 0; i < ctx->nold; i++)
1818: sshkey_free(ctx->old_keys[i]);
1819: free(ctx->old_keys);
1820: free(ctx->host_str);
1821: free(ctx->ip_str);
1822: free(ctx);
1823: }
1824:
1.350 djm 1825: /*
1826: * Returns non-zero if a known_hosts hostname list is not of a form that
1827: * can be handled by UpdateHostkeys. These include wildcard hostnames and
1828: * hostnames lists that do not follow the form host[,ip].
1829: */
1830: static int
1831: hostspec_is_complex(const char *hosts)
1832: {
1833: char *cp;
1834:
1835: /* wildcard */
1836: if (strchr(hosts, '*') != NULL || strchr(hosts, '?') != NULL)
1837: return 1;
1838: /* single host/ip = ok */
1839: if ((cp = strchr(hosts, ',')) == NULL)
1840: return 0;
1841: /* more than two entries on the line */
1842: if (strchr(cp + 1, ',') != NULL)
1843: return 1;
1844: /* XXX maybe parse cp+1 and ensure it is an IP? */
1845: return 0;
1846: }
1847:
1.352 djm 1848: /* callback to search for ctx->keys in known_hosts */
1.269 djm 1849: static int
1850: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
1851: {
1852: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1853: size_t i;
1854: struct sshkey **tmp;
1855:
1.353 djm 1856: if (l->key == NULL)
1.269 djm 1857: return 0;
1.353 djm 1858: if (l->status != HKF_STATUS_MATCHED) {
1859: /* Record if one of the keys appears on a non-matching line */
1860: for (i = 0; i < ctx->nkeys; i++) {
1861: if (sshkey_equal(l->key, ctx->keys[i])) {
1862: ctx->other_name_seen = 1;
1.354 djm 1863: debug3_f("found %s key under different "
1864: "name/addr at %s:%ld",
1.353 djm 1865: sshkey_ssh_name(ctx->keys[i]),
1866: l->path, l->linenum);
1867: return 0;
1868: }
1869: }
1870: return 0;
1871: }
1872: /* Don't proceed if revocation or CA markers are present */
1873: /* XXX relax this */
1874: if (l->marker != MRK_NONE) {
1.354 djm 1875: debug3_f("hostkeys file %s:%ld has CA/revocation marker",
1876: l->path, l->linenum);
1.353 djm 1877: ctx->complex_hostspec = 1;
1878: return 0;
1879: }
1880:
1.355 djm 1881: /* If CheckHostIP is enabled, then check for mismatched hostname/addr */
1882: if (ctx->ip_str != NULL && strchr(l->hosts, ',') != NULL) {
1883: if ((l->match & HKF_MATCH_HOST) == 0) {
1884: /* Record if address matched a different hostname. */
1885: ctx->other_name_seen = 1;
1886: debug3_f("found address %s against different hostname "
1887: "at %s:%ld", ctx->ip_str, l->path, l->linenum);
1888: return 0;
1889: } else if ((l->match & HKF_MATCH_IP) == 0) {
1890: /* Record if hostname matched a different address. */
1891: ctx->other_name_seen = 1;
1892: debug3_f("found hostname %s against different address "
1893: "at %s:%ld", ctx->host_str, l->path, l->linenum);
1894: }
1.353 djm 1895: }
1.269 djm 1896:
1.350 djm 1897: /*
1898: * UpdateHostkeys is skipped for wildcard host names and hostnames
1899: * that contain more than two entries (ssh never writes these).
1900: */
1901: if (hostspec_is_complex(l->hosts)) {
1.354 djm 1902: debug3_f("hostkeys file %s:%ld complex host specification",
1903: l->path, l->linenum);
1.350 djm 1904: ctx->complex_hostspec = 1;
1.347 djm 1905: return 0;
1906: }
1907:
1.269 djm 1908: /* Mark off keys we've already seen for this host */
1909: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 1910: if (!sshkey_equal(l->key, ctx->keys[i]))
1911: continue;
1.354 djm 1912: debug3_f("found %s key at %s:%ld",
1.351 djm 1913: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
1914: ctx->keys_match[i] |= l->match;
1915: return 0;
1.269 djm 1916: }
1917: /* This line contained a key that not offered by the server */
1.354 djm 1918: debug3_f("deprecated %s key at %s:%ld", sshkey_ssh_name(l->key),
1919: l->path, l->linenum);
1.299 deraadt 1920: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 1921: sizeof(*ctx->old_keys))) == NULL)
1.354 djm 1922: fatal_f("recallocarray failed nold = %zu", ctx->nold);
1.269 djm 1923: ctx->old_keys = tmp;
1924: ctx->old_keys[ctx->nold++] = l->key;
1925: l->key = NULL;
1926:
1927: return 0;
1928: }
1929:
1.352 djm 1930: /* callback to search for ctx->old_keys in known_hosts under other names */
1931: static int
1932: hostkeys_check_old(struct hostkey_foreach_line *l, void *_ctx)
1933: {
1934: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1935: size_t i;
1936: int hashed;
1937:
1938: /* only care about lines that *don't* match the active host spec */
1939: if (l->status == HKF_STATUS_MATCHED || l->key == NULL)
1940: return 0;
1941:
1942: hashed = l->match & (HKF_MATCH_HOST_HASHED|HKF_MATCH_IP_HASHED);
1943: for (i = 0; i < ctx->nold; i++) {
1944: if (!sshkey_equal(l->key, ctx->old_keys[i]))
1945: continue;
1.354 djm 1946: debug3_f("found deprecated %s key at %s:%ld as %s",
1.352 djm 1947: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum,
1948: hashed ? "[HASHED]" : l->hosts);
1949: ctx->old_key_seen = 1;
1950: break;
1951: }
1952: return 0;
1953: }
1954:
1955: /*
1956: * Check known_hosts files for deprecated keys under other names. Returns 0
1957: * on success or -1 on failure. Updates ctx->old_key_seen if deprecated keys
1958: * exist under names other than the active hostname/IP.
1959: */
1960: static int
1961: check_old_keys_othernames(struct hostkeys_update_ctx *ctx)
1962: {
1963: size_t i;
1964: int r;
1965:
1.354 djm 1966: debug2_f("checking for %zu deprecated keys", ctx->nold);
1.352 djm 1967: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 1968: debug3_f("searching %s for %s / %s",
1.352 djm 1969: options.user_hostfiles[i], ctx->host_str,
1970: ctx->ip_str ? ctx->ip_str : "(none)");
1971: if ((r = hostkeys_foreach(options.user_hostfiles[i],
1972: hostkeys_check_old, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 1973: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.352 djm 1974: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 1975: debug_f("hostkeys file %s does not exist",
1976: options.user_hostfiles[i]);
1.352 djm 1977: continue;
1978: }
1.354 djm 1979: error_fr(r, "hostkeys_foreach failed for %s",
1980: options.user_hostfiles[i]);
1.352 djm 1981: return -1;
1982: }
1983: }
1984: return 0;
1985: }
1986:
1.269 djm 1987: static void
1.337 djm 1988: hostkey_change_preamble(LogLevel loglevel)
1.269 djm 1989: {
1.336 djm 1990: do_log2(loglevel, "The server has updated its host keys.");
1991: do_log2(loglevel, "These changes were verified by the server's "
1992: "existing trusted key.");
1993: }
1994:
1995: static void
1996: update_known_hosts(struct hostkeys_update_ctx *ctx)
1997: {
1998: int r, was_raw = 0, first = 1;
1999: int asking = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK;
2000: LogLevel loglevel = asking ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1.269 djm 2001: char *fp, *response;
2002: size_t i;
1.333 djm 2003: struct stat sb;
1.269 djm 2004:
2005: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2006: if (!ctx->keys_verified[i])
1.269 djm 2007: continue;
2008: if ((fp = sshkey_fingerprint(ctx->keys[i],
2009: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2010: fatal_f("sshkey_fingerprint failed");
1.336 djm 2011: if (first && asking)
1.337 djm 2012: hostkey_change_preamble(loglevel);
1.269 djm 2013: do_log2(loglevel, "Learned new hostkey: %s %s",
2014: sshkey_type(ctx->keys[i]), fp);
1.336 djm 2015: first = 0;
1.269 djm 2016: free(fp);
2017: }
2018: for (i = 0; i < ctx->nold; i++) {
2019: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2020: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2021: fatal_f("sshkey_fingerprint failed");
1.336 djm 2022: if (first && asking)
1.337 djm 2023: hostkey_change_preamble(loglevel);
1.269 djm 2024: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2025: sshkey_type(ctx->old_keys[i]), fp);
1.336 djm 2026: first = 0;
1.269 djm 2027: free(fp);
2028: }
2029: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2030: if (get_saved_tio() != NULL) {
2031: leave_raw_mode(1);
2032: was_raw = 1;
2033: }
1.269 djm 2034: response = NULL;
2035: for (i = 0; !quit_pending && i < 3; i++) {
2036: free(response);
2037: response = read_passphrase("Accept updated hostkeys? "
2038: "(yes/no): ", RP_ECHO);
2039: if (strcasecmp(response, "yes") == 0)
2040: break;
2041: else if (quit_pending || response == NULL ||
2042: strcasecmp(response, "no") == 0) {
2043: options.update_hostkeys = 0;
2044: break;
2045: } else {
2046: do_log2(loglevel, "Please enter "
2047: "\"yes\" or \"no\"");
2048: }
2049: }
2050: if (quit_pending || i >= 3 || response == NULL)
2051: options.update_hostkeys = 0;
2052: free(response);
1.271 djm 2053: if (was_raw)
2054: enter_raw_mode(1);
1.269 djm 2055: }
1.333 djm 2056: if (options.update_hostkeys == 0)
2057: return;
1.269 djm 2058: /*
2059: * Now that all the keys are verified, we can go ahead and replace
2060: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2061: * cancel the operation).
2062: */
1.333 djm 2063: for (i = 0; i < options.num_user_hostfiles; i++) {
2064: /*
2065: * NB. keys are only added to hostfiles[0], for the rest we
2066: * just delete the hostname entries.
2067: */
2068: if (stat(options.user_hostfiles[i], &sb) != 0) {
2069: if (errno == ENOENT) {
1.354 djm 2070: debug_f("known hosts file %s does not "
2071: "exist", options.user_hostfiles[i]);
1.333 djm 2072: } else {
1.354 djm 2073: error_f("known hosts file %s "
2074: "inaccessible: %s",
2075: options.user_hostfiles[i], strerror(errno));
1.333 djm 2076: }
2077: continue;
2078: }
2079: if ((r = hostfile_replace_entries(options.user_hostfiles[i],
2080: ctx->host_str, ctx->ip_str,
2081: i == 0 ? ctx->keys : NULL, i == 0 ? ctx->nkeys : 0,
2082: options.hash_known_hosts, 0,
2083: options.fingerprint_hash)) != 0) {
1.354 djm 2084: error_fr(r, "hostfile_replace_entries failed for %s",
2085: options.user_hostfiles[i]);
1.333 djm 2086: }
2087: }
1.269 djm 2088: }
2089:
2090: static void
1.303 djm 2091: client_global_hostkeys_private_confirm(struct ssh *ssh, int type,
2092: u_int32_t seq, void *_ctx)
1.269 djm 2093: {
2094: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2095: size_t i, ndone;
2096: struct sshbuf *signdata;
1.309 djm 2097: int r, kexsigtype, use_kexsigtype;
1.269 djm 2098: const u_char *sig;
2099: size_t siglen;
2100:
2101: if (ctx->nnew == 0)
1.354 djm 2102: fatal_f("ctx->nnew == 0"); /* sanity */
1.269 djm 2103: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2104: error("Server failed to confirm ownership of "
2105: "private host keys");
2106: hostkeys_update_ctx_free(ctx);
2107: return;
2108: }
1.309 djm 2109: kexsigtype = sshkey_type_plain(
2110: sshkey_type_from_name(ssh->kex->hostkey_alg));
2111:
1.269 djm 2112: if ((signdata = sshbuf_new()) == NULL)
1.354 djm 2113: fatal_f("sshbuf_new failed");
1.269 djm 2114: /* Don't want to accidentally accept an unbound signature */
2115: if (ssh->kex->session_id_len == 0)
1.354 djm 2116: fatal_f("ssh->kex->session_id_len == 0");
1.269 djm 2117: /*
2118: * Expect a signature for each of the ctx->nnew private keys we
2119: * haven't seen before. They will be in the same order as the
1.351 djm 2120: * ctx->keys where the corresponding ctx->keys_match[i] == 0.
1.269 djm 2121: */
2122: for (ndone = i = 0; i < ctx->nkeys; i++) {
1.351 djm 2123: if (ctx->keys_match[i])
1.269 djm 2124: continue;
2125: /* Prepare data to be signed: session ID, unique string, key */
2126: sshbuf_reset(signdata);
1.270 djm 2127: if ( (r = sshbuf_put_cstring(signdata,
2128: "hostkeys-prove-00@openssh.com")) != 0 ||
2129: (r = sshbuf_put_string(signdata, ssh->kex->session_id,
1.269 djm 2130: ssh->kex->session_id_len)) != 0 ||
2131: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1.354 djm 2132: fatal_fr(r, "compose signdata");
1.269 djm 2133: /* Extract and verify signature */
2134: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1.354 djm 2135: error_fr(r, "parse sig");
1.269 djm 2136: goto out;
2137: }
1.309 djm 2138: /*
2139: * For RSA keys, prefer to use the signature type negotiated
2140: * during KEX to the default (SHA1).
2141: */
2142: use_kexsigtype = kexsigtype == KEY_RSA &&
2143: sshkey_type_plain(ctx->keys[i]->type) == KEY_RSA;
1.269 djm 2144: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1.308 djm 2145: sshbuf_ptr(signdata), sshbuf_len(signdata),
1.329 djm 2146: use_kexsigtype ? ssh->kex->hostkey_alg : NULL, 0,
2147: NULL)) != 0) {
1.354 djm 2148: error_f("server gave bad signature for %s key %zu",
2149: sshkey_type(ctx->keys[i]), i);
1.269 djm 2150: goto out;
2151: }
2152: /* Key is good. Mark it as 'seen' */
1.351 djm 2153: ctx->keys_verified[i] = 1;
1.269 djm 2154: ndone++;
2155: }
1.354 djm 2156: /* Shouldn't happen */
1.269 djm 2157: if (ndone != ctx->nnew)
1.354 djm 2158: fatal_f("ndone != ctx->nnew (%zu / %zu)", ndone, ctx->nnew);
1.320 djm 2159: if ((r = sshpkt_get_end(ssh)) != 0) {
1.354 djm 2160: error_f("protocol error");
1.320 djm 2161: goto out;
2162: }
1.269 djm 2163:
2164: /* Make the edits to known_hosts */
2165: update_known_hosts(ctx);
2166: out:
2167: hostkeys_update_ctx_free(ctx);
2168: }
2169:
1.267 djm 2170: /*
1.291 djm 2171: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
2172: * Made slightly less trivial by the multiple RSA signature algorithm names.
2173: */
2174: static int
2175: key_accepted_by_hostkeyalgs(const struct sshkey *key)
2176: {
2177: const char *ktype = sshkey_ssh_name(key);
1.331 dtucker 2178: const char *hostkeyalgs = options.hostkeyalgorithms;
1.291 djm 2179:
2180: if (key == NULL || key->type == KEY_UNSPEC)
2181: return 0;
2182: if (key->type == KEY_RSA &&
2183: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
2184: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
2185: return 1;
2186: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
2187: }
2188:
2189: /*
1.270 djm 2190: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2191: * the server's hostkeys. The keys are checked against the user's
2192: * HostkeyAlgorithms preference before they are accepted.
2193: */
2194: static int
1.321 djm 2195: client_input_hostkeys(struct ssh *ssh)
1.267 djm 2196: {
2197: const u_char *blob = NULL;
1.269 djm 2198: size_t i, len = 0;
1.267 djm 2199: struct sshbuf *buf = NULL;
1.269 djm 2200: struct sshkey *key = NULL, **tmp;
2201: int r;
2202: char *fp;
1.267 djm 2203: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2204: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2205: struct hostkeys_update_ctx *ctx = NULL;
1.351 djm 2206: u_int want;
1.267 djm 2207:
2208: if (hostkeys_seen)
1.354 djm 2209: fatal_f("server already sent hostkeys");
1.269 djm 2210: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
2211: options.batch_mode)
2212: return 1; /* won't ask in batchmode, so don't even try */
1.267 djm 2213: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
2214: return 1;
1.272 djm 2215:
2216: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2217: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2218: sshkey_free(key);
2219: key = NULL;
1.269 djm 2220: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
1.354 djm 2221: error_fr(r, "parse key");
1.269 djm 2222: goto out;
2223: }
1.270 djm 2224: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
1.354 djm 2225: do_log2_fr(r, r == SSH_ERR_KEY_TYPE_UNKNOWN ?
1.335 djm 2226: SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_ERROR,
1.354 djm 2227: "convert key");
1.335 djm 2228: continue;
1.270 djm 2229: }
1.267 djm 2230: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2231: SSH_FP_DEFAULT);
1.354 djm 2232: debug3_f("received %s key %s", sshkey_type(key), fp);
1.267 djm 2233: free(fp);
1.275 markus 2234:
1.291 djm 2235: if (!key_accepted_by_hostkeyalgs(key)) {
1.354 djm 2236: debug3_f("%s key not permitted by "
2237: "HostkeyAlgorithms", sshkey_ssh_name(key));
1.267 djm 2238: continue;
2239: }
1.269 djm 2240: /* Skip certs */
2241: if (sshkey_is_cert(key)) {
1.354 djm 2242: debug3_f("%s key is a certificate; skipping",
2243: sshkey_ssh_name(key));
1.269 djm 2244: continue;
2245: }
2246: /* Ensure keys are unique */
2247: for (i = 0; i < ctx->nkeys; i++) {
2248: if (sshkey_equal(key, ctx->keys[i])) {
1.354 djm 2249: error_f("received duplicated %s host key",
2250: sshkey_ssh_name(key));
1.269 djm 2251: goto out;
2252: }
2253: }
2254: /* Key is good, record it */
1.299 deraadt 2255: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2256: sizeof(*ctx->keys))) == NULL)
1.354 djm 2257: fatal_f("recallocarray failed nkeys = %zu",
2258: ctx->nkeys);
1.269 djm 2259: ctx->keys = tmp;
2260: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2261: key = NULL;
2262: }
2263:
1.269 djm 2264: if (ctx->nkeys == 0) {
1.354 djm 2265: debug_f("server sent no hostkeys");
1.267 djm 2266: goto out;
2267: }
1.270 djm 2268:
1.351 djm 2269: if ((ctx->keys_match = calloc(ctx->nkeys,
2270: sizeof(*ctx->keys_match))) == NULL ||
2271: (ctx->keys_verified = calloc(ctx->nkeys,
2272: sizeof(*ctx->keys_verified))) == NULL)
1.354 djm 2273: fatal_f("calloc failed");
1.267 djm 2274:
1.268 djm 2275: get_hostfile_hostname_ipaddr(host,
2276: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2277: options.port, &ctx->host_str,
2278: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2279:
1.269 djm 2280: /* Find which keys we already know about. */
1.333 djm 2281: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 2282: debug_f("searching %s for %s / %s",
1.339 dtucker 2283: options.user_hostfiles[i], ctx->host_str,
1.340 dtucker 2284: ctx->ip_str ? ctx->ip_str : "(none)");
1.333 djm 2285: if ((r = hostkeys_foreach(options.user_hostfiles[i],
2286: hostkeys_find, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 2287: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.333 djm 2288: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 2289: debug_f("hostkeys file %s does not exist",
2290: options.user_hostfiles[i]);
1.333 djm 2291: continue;
2292: }
1.354 djm 2293: error_fr(r, "hostkeys_foreach failed for %s",
2294: options.user_hostfiles[i]);
1.333 djm 2295: goto out;
2296: }
1.267 djm 2297: }
2298:
1.269 djm 2299: /* Figure out if we have any new keys to add */
1.351 djm 2300: ctx->nnew = ctx->nincomplete = 0;
2301: want = HKF_MATCH_HOST | ( options.check_host_ip ? HKF_MATCH_IP : 0);
1.269 djm 2302: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2303: if (ctx->keys_match[i] == 0)
1.269 djm 2304: ctx->nnew++;
1.351 djm 2305: if ((ctx->keys_match[i] & want) != want)
2306: ctx->nincomplete++;
1.269 djm 2307: }
2308:
1.354 djm 2309: debug3_f("%zu server keys: %zu new, %zu retained, "
2310: "%zu incomplete match. %zu to remove", ctx->nkeys, ctx->nnew,
2311: ctx->nkeys - ctx->nnew - ctx->nincomplete,
1.351 djm 2312: ctx->nincomplete, ctx->nold);
1.269 djm 2313:
1.353 djm 2314: if (ctx->nnew == 0 && ctx->nold == 0) {
1.354 djm 2315: debug_f("no new or deprecated keys from server");
1.353 djm 2316: goto out;
2317: }
2318:
2319: /* Various reasons why we cannot proceed with the update */
2320: if (ctx->complex_hostspec) {
1.354 djm 2321: debug_f("CA/revocation marker, manual host list or wildcard "
2322: "host pattern found, skipping UserKnownHostsFile update");
1.353 djm 2323: goto out;
2324: }
2325: if (ctx->other_name_seen) {
1.354 djm 2326: debug_f("host key found matching a different name/address, "
2327: "skipping UserKnownHostsFile update");
1.347 djm 2328: goto out;
1.352 djm 2329: }
2330: /*
2331: * If removing keys, check whether they appear under different
2332: * names/addresses and refuse to proceed if they do. This avoids
2333: * cases such as hosts with multiple names becoming inconsistent
2334: * with regards to CheckHostIP entries.
2335: * XXX UpdateHostkeys=force to override this (and other) checks?
2336: */
2337: if (ctx->nold != 0) {
2338: if (check_old_keys_othernames(ctx) != 0)
2339: goto out; /* error already logged */
2340: if (ctx->old_key_seen) {
1.354 djm 2341: debug_f("key(s) for %s%s%s exist under other names; "
2342: "skipping UserKnownHostsFile update",
1.352 djm 2343: ctx->host_str, ctx->ip_str == NULL ? "" : ",",
2344: ctx->ip_str == NULL ? "" : ctx->ip_str);
2345: goto out;
2346: }
2347: }
2348:
1.353 djm 2349: if (ctx->nnew == 0) {
1.351 djm 2350: /*
2351: * We have some keys to remove or fix matching for.
2352: * We can proceed to do this without requiring a fresh proof
2353: * from the server.
2354: */
1.269 djm 2355: update_known_hosts(ctx);
1.353 djm 2356: goto out;
2357: }
2358: /*
2359: * We have received previously-unseen keys from the server.
2360: * Ask the server to confirm ownership of the private halves.
2361: */
1.354 djm 2362: debug3_f("asking server to prove ownership for %zu keys", ctx->nnew);
1.353 djm 2363: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2364: (r = sshpkt_put_cstring(ssh,
2365: "hostkeys-prove-00@openssh.com")) != 0 ||
2366: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
1.354 djm 2367: fatal_fr(r, "prepare hostkeys-prove");
1.353 djm 2368: if ((buf = sshbuf_new()) == NULL)
1.354 djm 2369: fatal_f("sshbuf_new");
1.353 djm 2370: for (i = 0; i < ctx->nkeys; i++) {
2371: if (ctx->keys_match[i])
2372: continue;
2373: sshbuf_reset(buf);
2374: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0 ||
1.354 djm 2375: (r = sshpkt_put_stringb(ssh, buf)) != 0)
2376: fatal_fr(r, "assemble hostkeys-prove");
1.269 djm 2377: }
1.353 djm 2378: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2379: fatal_fr(r, "send hostkeys-prove");
1.353 djm 2380: client_register_global_confirm(
2381: client_global_hostkeys_private_confirm, ctx);
2382: ctx = NULL; /* will be freed in callback */
1.269 djm 2383:
1.267 djm 2384: /* Success */
2385: out:
1.269 djm 2386: hostkeys_update_ctx_free(ctx);
1.267 djm 2387: sshkey_free(key);
2388: sshbuf_free(buf);
1.269 djm 2389: /*
2390: * NB. Return success for all cases. The server doesn't need to know
2391: * what the client does with its hosts file.
2392: */
2393: return 1;
1.267 djm 2394: }
2395:
1.264 markus 2396: static int
1.297 markus 2397: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2398: {
2399: char *rtype;
1.320 djm 2400: u_char want_reply;
2401: int r, success = 0;
1.95 markus 2402:
1.320 djm 2403: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
2404: (r = sshpkt_get_u8(ssh, &want_reply)) != 0)
2405: goto out;
1.117 markus 2406: debug("client_input_global_request: rtype %s want_reply %d",
2407: rtype, want_reply);
1.270 djm 2408: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.321 djm 2409: success = client_input_hostkeys(ssh);
1.95 markus 2410: if (want_reply) {
1.320 djm 2411: if ((r = sshpkt_start(ssh, success ? SSH2_MSG_REQUEST_SUCCESS :
2412: SSH2_MSG_REQUEST_FAILURE)) != 0 ||
2413: (r = sshpkt_send(ssh)) != 0 ||
2414: (r = ssh_packet_write_wait(ssh)) != 0)
2415: goto out;
1.95 markus 2416: }
1.320 djm 2417: r = 0;
2418: out:
1.250 djm 2419: free(rtype);
1.320 djm 2420: return r;
1.95 markus 2421: }
1.22 markus 2422:
1.354 djm 2423: static void
2424: client_send_env(struct ssh *ssh, int id, const char *name, const char *val)
2425: {
2426: int r;
2427:
2428: debug("channel %d: setting env %s = \"%s\"", id, name, val);
2429: channel_request_start(ssh, id, "env", 0);
2430: if ((r = sshpkt_put_cstring(ssh, name)) != 0 ||
2431: (r = sshpkt_put_cstring(ssh, val)) != 0 ||
2432: (r = sshpkt_send(ssh)) != 0)
2433: fatal_fr(r, "send setenv");
2434: }
2435:
1.123 djm 2436: void
1.303 djm 2437: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.315 markus 2438: const char *term, struct termios *tiop, int in_fd, struct sshbuf *cmd,
2439: char **env)
1.123 djm 2440: {
1.320 djm 2441: int i, j, matched, len, r;
1.313 djm 2442: char *name, *val;
1.132 djm 2443: Channel *c = NULL;
1.123 djm 2444:
1.354 djm 2445: debug2_f("id %d", id);
1.123 djm 2446:
1.303 djm 2447: if ((c = channel_lookup(ssh, id)) == NULL)
1.354 djm 2448: fatal_f("channel %d: unknown channel", id);
1.224 djm 2449:
1.320 djm 2450: ssh_packet_set_interactive(ssh, want_tty,
1.224 djm 2451: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2452:
1.123 djm 2453: if (want_tty) {
2454: struct winsize ws;
2455:
2456: /* Store window size in the packet. */
1.326 deraadt 2457: if (ioctl(in_fd, TIOCGWINSZ, &ws) == -1)
1.123 djm 2458: memset(&ws, 0, sizeof(ws));
2459:
1.303 djm 2460: channel_request_start(ssh, id, "pty-req", 1);
2461: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.320 djm 2462: if ((r = sshpkt_put_cstring(ssh, term != NULL ? term : ""))
2463: != 0 ||
2464: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 ||
2465: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 ||
2466: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 ||
2467: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0)
1.354 djm 2468: fatal_fr(r, "build pty-req");
1.194 djm 2469: if (tiop == NULL)
2470: tiop = get_saved_tio();
1.316 markus 2471: ssh_tty_make_modes(ssh, -1, tiop);
1.320 djm 2472: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2473: fatal_fr(r, "send pty-req");
1.123 djm 2474: /* XXX wait for reply */
1.132 djm 2475: c->client_tty = 1;
1.123 djm 2476: }
2477:
2478: /* Transfer any environment variables from client to server */
1.126 djm 2479: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2480: debug("Sending environment.");
1.126 djm 2481: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2482: /* Split */
1.126 djm 2483: name = xstrdup(env[i]);
1.123 djm 2484: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2485: free(name);
1.123 djm 2486: continue;
2487: }
2488: *val++ = '\0';
2489:
2490: matched = 0;
2491: for (j = 0; j < options.num_send_env; j++) {
2492: if (match_pattern(name, options.send_env[j])) {
2493: matched = 1;
2494: break;
2495: }
2496: }
2497: if (!matched) {
2498: debug3("Ignored env %s", name);
1.250 djm 2499: free(name);
1.123 djm 2500: continue;
2501: }
1.354 djm 2502: client_send_env(ssh, id, name, val);
1.250 djm 2503: free(name);
1.123 djm 2504: }
1.313 djm 2505: }
2506: for (i = 0; i < options.num_setenv; i++) {
2507: /* Split */
2508: name = xstrdup(options.setenv[i]);
2509: if ((val = strchr(name, '=')) == NULL) {
2510: free(name);
2511: continue;
2512: }
2513: *val++ = '\0';
1.354 djm 2514: client_send_env(ssh, id, name, val);
1.313 djm 2515: free(name);
1.123 djm 2516: }
2517:
1.315 markus 2518: len = sshbuf_len(cmd);
1.123 djm 2519: if (len > 0) {
2520: if (len > 900)
2521: len = 900;
2522: if (want_subsystem) {
1.190 djm 2523: debug("Sending subsystem: %.*s",
1.315 markus 2524: len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2525: channel_request_start(ssh, id, "subsystem", 1);
2526: client_expect_confirm(ssh, id, "subsystem",
2527: CONFIRM_CLOSE);
1.123 djm 2528: } else {
1.190 djm 2529: debug("Sending command: %.*s",
1.315 markus 2530: len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2531: channel_request_start(ssh, id, "exec", 1);
2532: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2533: }
1.320 djm 2534: if ((r = sshpkt_put_stringb(ssh, cmd)) != 0 ||
2535: (r = sshpkt_send(ssh)) != 0)
1.354 djm 2536: fatal_fr(r, "send command");
1.123 djm 2537: } else {
1.303 djm 2538: channel_request_start(ssh, id, "shell", 1);
2539: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.354 djm 2540: if ((r = sshpkt_send(ssh)) != 0)
2541: fatal_fr(r, "send shell");
1.123 djm 2542: }
2543: }
2544:
1.77 itojun 2545: static void
1.321 djm 2546: client_init_dispatch(struct ssh *ssh)
1.16 markus 2547: {
1.321 djm 2548: ssh_dispatch_init(ssh, &dispatch_protocol_error);
1.100 markus 2549:
1.321 djm 2550: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2551: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2552: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2553: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2554: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2555: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2556: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2557: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2558: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2559: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2560: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2561: ssh_dispatch_set(ssh, SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2562:
2563: /* rekeying */
1.321 djm 2564: ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2565:
2566: /* global request reply messages */
1.321 djm 2567: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2568: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2569: }
2570:
2571: void
2572: client_stop_mux(void)
2573: {
2574: if (options.control_path != NULL && muxserver_sock != -1)
2575: unlink(options.control_path);
2576: /*
1.247 dtucker 2577: * If we are in persist mode, or don't have a shell, signal that we
2578: * should close when all active channels are closed.
1.232 djm 2579: */
1.247 dtucker 2580: if (options.control_persist || no_shell_flag) {
1.232 djm 2581: session_closed = 1;
1.235 djm 2582: setproctitle("[stopped mux]");
2583: }
1.113 markus 2584: }
2585:
2586: /* client specific fatal cleanup */
2587: void
1.114 markus 2588: cleanup_exit(int i)
1.113 markus 2589: {
1.233 djm 2590: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.192 djm 2591: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2592: unlink(options.control_path);
1.223 djm 2593: ssh_kill_proxy_command();
1.114 markus 2594: _exit(i);
1.1 deraadt 2595: }