Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.390
1.390 ! guenther 1: /* $OpenBSD: clientloop.c,v 1.389 2023/03/03 09:48:51 dtucker Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
1.152 stevesk 62:
1.175 deraadt 63: #include <sys/types.h>
1.152 stevesk 64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/stat.h>
1.166 stevesk 66: #include <sys/socket.h>
1.171 stevesk 67: #include <sys/time.h>
1.189 djm 68: #include <sys/queue.h>
1.150 stevesk 69:
1.155 stevesk 70: #include <ctype.h>
1.168 stevesk 71: #include <errno.h>
1.151 stevesk 72: #include <paths.h>
1.374 djm 73: #include <poll.h>
1.153 stevesk 74: #include <signal.h>
1.174 stevesk 75: #include <stdio.h>
1.173 stevesk 76: #include <stdlib.h>
1.170 stevesk 77: #include <string.h>
1.328 deraadt 78: #include <stdarg.h>
1.150 stevesk 79: #include <termios.h>
1.175 deraadt 80: #include <pwd.h>
1.169 stevesk 81: #include <unistd.h>
1.266 deraadt 82: #include <limits.h>
1.1 deraadt 83:
1.175 deraadt 84: #include "xmalloc.h"
1.45 markus 85: #include "ssh.h"
86: #include "ssh2.h"
1.1 deraadt 87: #include "packet.h"
1.315 markus 88: #include "sshbuf.h"
1.15 markus 89: #include "compat.h"
1.74 markus 90: #include "channels.h"
1.15 markus 91: #include "dispatch.h"
1.317 markus 92: #include "sshkey.h"
1.175 deraadt 93: #include "cipher.h"
1.54 markus 94: #include "kex.h"
1.275 markus 95: #include "myproposal.h"
1.45 markus 96: #include "log.h"
1.261 millert 97: #include "misc.h"
1.45 markus 98: #include "readconf.h"
99: #include "clientloop.h"
1.147 djm 100: #include "sshconnect.h"
1.40 markus 101: #include "authfd.h"
1.45 markus 102: #include "atomicio.h"
1.118 deraadt 103: #include "sshpty.h"
1.123 djm 104: #include "match.h"
105: #include "msg.h"
1.262 djm 106: #include "ssherr.h"
1.267 djm 107: #include "hostfile.h"
1.319 djm 108:
1.375 djm 109: /* Permitted RSA signature algorithms for UpdateHostkeys proofs */
110: #define HOSTKEY_PROOF_RSA_ALGS "rsa-sha2-512,rsa-sha2-256"
111:
1.39 markus 112: /* import options */
113: extern Options options;
1.1 deraadt 114:
1.123 djm 115: /* Control socket */
1.217 djm 116: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 117:
1.13 markus 118: /*
119: * Name of the host we are connecting to. This is the name given on the
1.324 jmc 120: * command line, or the Hostname specified for the user-supplied name in a
1.13 markus 121: * configuration file.
122: */
1.1 deraadt 123: extern char *host;
124:
1.13 markus 125: /*
1.330 djm 126: * If this field is not NULL, the ForwardAgent socket is this path and different
127: * instead of SSH_AUTH_SOCK.
128: */
129: extern char *forward_agent_sock_path;
130:
131: /*
1.13 markus 132: * Flag to indicate that we have received a window change signal which has
133: * not yet been processed. This will cause a message indicating the new
134: * window size to be sent to the server a little later. This is volatile
135: * because this is updated in a signal handler.
136: */
1.88 markus 137: static volatile sig_atomic_t received_window_change_signal = 0;
138: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 139:
1.222 djm 140: /* Time when backgrounded control master using ControlPersist should exit */
141: static time_t control_persist_exit_time = 0;
142:
1.1 deraadt 143: /* Common data for the client loop code. */
1.217 djm 144: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.11 markus 145: static int last_was_cr; /* Last character was a newline. */
1.197 djm 146: static int exit_status; /* Used to store the command exit status. */
1.315 markus 147: static struct sshbuf *stderr_buffer; /* Used for final exit message. */
1.11 markus 148: static int connection_in; /* Connection to server (input). */
149: static int connection_out; /* Connection to server (output). */
1.56 markus 150: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 151: static int session_closed; /* In SSH2: login session closed. */
1.388 dtucker 152: static time_t x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.345 dtucker 153: static time_t server_alive_time; /* Time to do server_alive_check */
1.384 djm 154: static int hostkeys_update_complete;
155: static int session_setup_complete;
1.1 deraadt 156:
1.321 djm 157: static void client_init_dispatch(struct ssh *ssh);
1.16 markus 158: int session_ident = -1;
159:
1.195 djm 160: /* Track escape per proto2 channel */
161: struct escape_filter_ctx {
162: int escape_pending;
163: int escape_char;
164: };
165:
166: /* Context for channel confirmation replies */
1.190 djm 167: struct channel_reply_ctx {
168: const char *request_type;
1.234 djm 169: int id;
170: enum confirm_action action;
1.190 djm 171: };
172:
1.196 djm 173: /* Global request success/failure callbacks */
1.303 djm 174: /* XXX move to struct ssh? */
1.196 djm 175: struct global_confirm {
176: TAILQ_ENTRY(global_confirm) entry;
177: global_confirm_cb *cb;
178: void *ctx;
179: int ref_count;
180: };
181: TAILQ_HEAD(global_confirms, global_confirm);
182: static struct global_confirms global_confirms =
183: TAILQ_HEAD_INITIALIZER(global_confirms);
184:
1.315 markus 185: void ssh_process_session2_setup(int, int, int, struct sshbuf *);
1.377 djm 186: static void quit_message(const char *fmt, ...)
187: __attribute__((__format__ (printf, 1, 2)));
188:
189: static void
190: quit_message(const char *fmt, ...)
191: {
192: char *msg;
193: va_list args;
194: int r;
195:
196: va_start(args, fmt);
197: xvasprintf(&msg, fmt, args);
198: va_end(args);
199:
200: if ((r = sshbuf_putf(stderr_buffer, "%s\r\n", msg)) != 0)
201: fatal_fr(r, "sshbuf_putf");
202: quit_pending = 1;
203: }
1.123 djm 204:
1.13 markus 205: /*
206: * Signal handler for the window change signal (SIGWINCH). This just sets a
207: * flag indicating that the window has changed.
208: */
1.77 itojun 209: static void
1.11 markus 210: window_change_handler(int sig)
1.1 deraadt 211: {
1.11 markus 212: received_window_change_signal = 1;
1.1 deraadt 213: }
214:
1.13 markus 215: /*
216: * Signal handler for signals that cause the program to terminate. These
217: * signals must be trapped to restore terminal modes.
218: */
1.77 itojun 219: static void
1.11 markus 220: signal_handler(int sig)
1.1 deraadt 221: {
1.75 markus 222: received_signal = sig;
223: quit_pending = 1;
1.1 deraadt 224: }
225:
1.13 markus 226: /*
1.222 djm 227: * Sets control_persist_exit_time to the absolute time when the
228: * backgrounded control master should exit due to expiry of the
229: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
230: * control master process, or if there is no ControlPersist timeout.
231: */
232: static void
1.303 djm 233: set_control_persist_exit_time(struct ssh *ssh)
1.222 djm 234: {
235: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 236: || options.control_persist_timeout == 0) {
1.222 djm 237: /* not using a ControlPersist timeout */
238: control_persist_exit_time = 0;
1.303 djm 239: } else if (channel_still_open(ssh)) {
1.222 djm 240: /* some client connections are still open */
241: if (control_persist_exit_time > 0)
1.354 djm 242: debug2_f("cancel scheduled exit");
1.222 djm 243: control_persist_exit_time = 0;
244: } else if (control_persist_exit_time <= 0) {
245: /* a client connection has recently closed */
1.251 dtucker 246: control_persist_exit_time = monotime() +
1.222 djm 247: (time_t)options.control_persist_timeout;
1.354 djm 248: debug2_f("schedule exit in %d seconds",
1.222 djm 249: options.control_persist_timeout);
250: }
251: /* else we are already counting down to the timeout */
252: }
253:
1.238 dtucker 254: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
255: static int
256: client_x11_display_valid(const char *display)
257: {
258: size_t i, dlen;
259:
1.279 djm 260: if (display == NULL)
261: return 0;
262:
1.238 dtucker 263: dlen = strlen(display);
264: for (i = 0; i < dlen; i++) {
1.256 deraadt 265: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 266: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
267: debug("Invalid character '%c' in DISPLAY", display[i]);
268: return 0;
269: }
270: }
271: return 1;
272: }
273:
1.274 djm 274: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
275: #define X11_TIMEOUT_SLACK 60
1.279 djm 276: int
1.303 djm 277: client_x11_get_proto(struct ssh *ssh, const char *display,
278: const char *xauth_path, u_int trusted, u_int timeout,
279: char **_proto, char **_data)
1.138 djm 280: {
1.318 djm 281: char *cmd, line[512], xdisplay[512];
1.279 djm 282: char xauthfile[PATH_MAX], xauthdir[PATH_MAX];
1.138 djm 283: static char proto[512], data[512];
284: FILE *f;
1.288 tedu 285: int got_data = 0, generated = 0, do_unlink = 0, r;
1.138 djm 286: struct stat st;
1.274 djm 287: u_int now, x11_timeout_real;
1.138 djm 288:
289: *_proto = proto;
290: *_data = data;
1.279 djm 291: proto[0] = data[0] = xauthfile[0] = xauthdir[0] = '\0';
1.138 djm 292:
1.279 djm 293: if (!client_x11_display_valid(display)) {
1.283 millert 294: if (display != NULL)
295: logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
296: display);
1.279 djm 297: return -1;
298: }
299: if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
1.138 djm 300: debug("No xauth program.");
1.279 djm 301: xauth_path = NULL;
302: }
303:
304: if (xauth_path != NULL) {
1.138 djm 305: /*
306: * Handle FamilyLocal case where $DISPLAY does
307: * not match an authorization entry. For this we
308: * just try "xauth list unix:displaynum.screennum".
309: * XXX: "localhost" match to determine FamilyLocal
310: * is not perfect.
311: */
312: if (strncmp(display, "localhost:", 10) == 0) {
1.279 djm 313: if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
314: display + 10)) < 0 ||
315: (size_t)r >= sizeof(xdisplay)) {
1.354 djm 316: error_f("display name too long");
1.279 djm 317: return -1;
318: }
1.138 djm 319: display = xdisplay;
320: }
321: if (trusted == 0) {
1.274 djm 322: /*
1.279 djm 323: * Generate an untrusted X11 auth cookie.
324: *
1.274 djm 325: * The authentication cookie should briefly outlive
326: * ssh's willingness to forward X11 connections to
327: * avoid nasty fail-open behaviour in the X server.
328: */
1.279 djm 329: mktemp_proto(xauthdir, sizeof(xauthdir));
330: if (mkdtemp(xauthdir) == NULL) {
1.354 djm 331: error_f("mkdtemp: %s", strerror(errno));
1.279 djm 332: return -1;
333: }
334: do_unlink = 1;
335: if ((r = snprintf(xauthfile, sizeof(xauthfile),
336: "%s/xauthfile", xauthdir)) < 0 ||
337: (size_t)r >= sizeof(xauthfile)) {
1.354 djm 338: error_f("xauthfile path too long");
1.279 djm 339: rmdir(xauthdir);
340: return -1;
341: }
342:
1.318 djm 343: if (timeout == 0) {
344: /* auth doesn't time out */
345: xasprintf(&cmd, "%s -f %s generate %s %s "
346: "untrusted 2>%s",
347: xauth_path, xauthfile, display,
348: SSH_X11_PROTO, _PATH_DEVNULL);
349: } else {
350: /* Add some slack to requested expiry */
351: if (timeout < UINT_MAX - X11_TIMEOUT_SLACK)
352: x11_timeout_real = timeout +
353: X11_TIMEOUT_SLACK;
354: else {
355: /* Don't overflow on long timeouts */
356: x11_timeout_real = UINT_MAX;
357: }
358: xasprintf(&cmd, "%s -f %s generate %s %s "
359: "untrusted timeout %u 2>%s",
360: xauth_path, xauthfile, display,
361: SSH_X11_PROTO, x11_timeout_real,
362: _PATH_DEVNULL);
363: }
1.354 djm 364: debug2_f("xauth command: %s", cmd);
1.318 djm 365:
366: if (timeout != 0 && x11_refuse_time == 0) {
1.279 djm 367: now = monotime() + 1;
1.388 dtucker 368: if (SSH_TIME_T_MAX - timeout < now)
369: x11_refuse_time = SSH_TIME_T_MAX;
1.279 djm 370: else
371: x11_refuse_time = now + timeout;
1.303 djm 372: channel_set_x11_refuse_time(ssh,
373: x11_refuse_time);
1.138 djm 374: }
1.279 djm 375: if (system(cmd) == 0)
376: generated = 1;
1.318 djm 377: free(cmd);
1.138 djm 378: }
1.181 markus 379:
380: /*
381: * When in untrusted mode, we read the cookie only if it was
382: * successfully generated as an untrusted one in the step
383: * above.
384: */
385: if (trusted || generated) {
1.318 djm 386: xasprintf(&cmd,
1.181 markus 387: "%s %s%s list %s 2>" _PATH_DEVNULL,
388: xauth_path,
389: generated ? "-f " : "" ,
390: generated ? xauthfile : "",
391: display);
392: debug2("x11_get_proto: %s", cmd);
393: f = popen(cmd, "r");
394: if (f && fgets(line, sizeof(line), f) &&
395: sscanf(line, "%*s %511s %511s", proto, data) == 2)
396: got_data = 1;
397: if (f)
398: pclose(f);
1.318 djm 399: free(cmd);
1.279 djm 400: }
1.138 djm 401: }
402:
403: if (do_unlink) {
404: unlink(xauthfile);
405: rmdir(xauthdir);
406: }
407:
1.279 djm 408: /* Don't fall back to fake X11 data for untrusted forwarding */
409: if (!trusted && !got_data) {
410: error("Warning: untrusted X11 forwarding setup failed: "
411: "xauth key data not generated");
412: return -1;
413: }
414:
1.138 djm 415: /*
416: * If we didn't get authentication data, just make up some
417: * data. The forwarding code will check the validity of the
418: * response anyway, and substitute this data. The X11
419: * server, however, will ignore this fake data and use
420: * whatever authentication mechanisms it was using otherwise
421: * for the local connection.
422: */
423: if (!got_data) {
1.288 tedu 424: u_int8_t rnd[16];
425: u_int i;
1.138 djm 426:
427: logit("Warning: No xauth data; "
428: "using fake authentication data for X11 forwarding.");
429: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.288 tedu 430: arc4random_buf(rnd, sizeof(rnd));
431: for (i = 0; i < sizeof(rnd); i++) {
1.138 djm 432: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.288 tedu 433: rnd[i]);
1.138 djm 434: }
435: }
1.279 djm 436:
437: return 0;
1.1 deraadt 438: }
439:
1.13 markus 440: /*
441: * Checks if the client window has changed, and sends a packet about it to
442: * the server if so. The actual change is detected elsewhere (by a software
443: * interrupt on Unix); this just checks the flag and sends a message if
444: * appropriate.
445: */
1.1 deraadt 446:
1.77 itojun 447: static void
1.303 djm 448: client_check_window_change(struct ssh *ssh)
1.1 deraadt 449: {
1.292 djm 450: if (!received_window_change_signal)
1.16 markus 451: return;
452: received_window_change_signal = 0;
1.354 djm 453: debug2_f("changed");
1.303 djm 454: channel_send_window_changes(ssh);
1.1 deraadt 455: }
456:
1.264 markus 457: static int
1.297 markus 458: client_global_request_reply(int type, u_int32_t seq, struct ssh *ssh)
1.117 markus 459: {
1.196 djm 460: struct global_confirm *gc;
461:
462: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 463: return 0;
1.196 djm 464: if (gc->cb != NULL)
1.303 djm 465: gc->cb(ssh, type, seq, gc->ctx);
1.196 djm 466: if (--gc->ref_count <= 0) {
467: TAILQ_REMOVE(&global_confirms, gc, entry);
1.342 jsg 468: freezero(gc, sizeof(*gc));
1.196 djm 469: }
470:
1.320 djm 471: ssh_packet_set_alive_timeouts(ssh, 0);
1.264 markus 472: return 0;
1.117 markus 473: }
474:
475: static void
1.345 dtucker 476: schedule_server_alive_check(void)
477: {
478: if (options.server_alive_interval > 0)
479: server_alive_time = monotime() + options.server_alive_interval;
480: }
481:
482: static void
1.320 djm 483: server_alive_check(struct ssh *ssh)
1.117 markus 484: {
1.320 djm 485: int r;
486:
487: if (ssh_packet_inc_alive_timeouts(ssh) > options.server_alive_count_max) {
1.228 djm 488: logit("Timeout, server %s not responding.", host);
1.176 markus 489: cleanup_exit(255);
490: }
1.320 djm 491: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
492: (r = sshpkt_put_cstring(ssh, "keepalive@openssh.com")) != 0 ||
493: (r = sshpkt_put_u8(ssh, 1)) != 0 || /* boolean: want reply */
494: (r = sshpkt_send(ssh)) != 0)
1.354 djm 495: fatal_fr(r, "send packet");
1.196 djm 496: /* Insert an empty placeholder to maintain ordering */
497: client_register_global_confirm(NULL, NULL);
1.345 dtucker 498: schedule_server_alive_check();
1.117 markus 499: }
500:
1.13 markus 501: /*
502: * Waits until the client can do something (some data becomes available on
503: * one of the file descriptors).
504: */
1.77 itojun 505: static void
1.374 djm 506: client_wait_until_can_do_something(struct ssh *ssh, struct pollfd **pfdp,
507: u_int *npfd_allocp, u_int *npfd_activep, int rekeying,
508: int *conn_in_readyp, int *conn_out_readyp)
1.11 markus 509: {
1.386 djm 510: struct timespec timeout;
1.377 djm 511: int ret;
1.374 djm 512: u_int p;
1.117 markus 513:
1.374 djm 514: *conn_in_readyp = *conn_out_readyp = 0;
1.11 markus 515:
1.374 djm 516: /* Prepare channel poll. First two pollfd entries are reserved */
1.386 djm 517: ptimeout_init(&timeout);
518: channel_prepare_poll(ssh, pfdp, npfd_allocp, npfd_activep, 2, &timeout);
1.374 djm 519: if (*npfd_activep < 2)
520: fatal_f("bad npfd %u", *npfd_activep); /* shouldn't happen */
521:
522: /* channel_prepare_poll could have closed the last channel */
1.303 djm 523: if (session_closed && !channel_still_open(ssh) &&
1.320 djm 524: !ssh_packet_have_data_to_write(ssh)) {
1.374 djm 525: /* clear events since we did not call poll() */
526: for (p = 0; p < *npfd_activep; p++)
527: (*pfdp)[p].revents = 0;
1.292 djm 528: return;
1.16 markus 529: }
1.11 markus 530:
1.374 djm 531: /* Monitor server connection on reserved pollfd entries */
532: (*pfdp)[0].fd = connection_in;
533: (*pfdp)[0].events = POLLIN;
534: (*pfdp)[1].fd = connection_out;
535: (*pfdp)[1].events = ssh_packet_have_data_to_write(ssh) ? POLLOUT : 0;
1.11 markus 536:
1.13 markus 537: /*
538: * Wait for something to happen. This will suspend the process until
1.374 djm 539: * some polled descriptor can be read, written, or has some other
1.222 djm 540: * event pending, or a timeout expires.
1.13 markus 541: */
1.386 djm 542: set_control_persist_exit_time(ssh);
543: if (control_persist_exit_time > 0)
544: ptimeout_deadline_monotime(&timeout, control_persist_exit_time);
1.345 dtucker 545: if (options.server_alive_interval > 0)
1.386 djm 546: ptimeout_deadline_monotime(&timeout, server_alive_time);
547: if (options.rekey_interval > 0 && !rekeying) {
548: ptimeout_deadline_sec(&timeout,
1.320 djm 549: ssh_packet_get_rekey_timeout(ssh));
1.386 djm 550: }
1.374 djm 551:
1.386 djm 552: ret = poll(*pfdp, *npfd_activep, ptimeout_get_ms(&timeout));
1.222 djm 553:
1.326 deraadt 554: if (ret == -1) {
1.51 markus 555: /*
1.374 djm 556: * We have to clear the events because we return.
1.51 markus 557: * We have to return, because the mainloop checks for the flags
558: * set by the signal handlers.
559: */
1.374 djm 560: for (p = 0; p < *npfd_activep; p++)
561: (*pfdp)[p].revents = 0;
1.11 markus 562: if (errno == EINTR)
563: return;
564: /* Note: we might still have data in the buffers. */
1.377 djm 565: quit_message("poll: %s", strerror(errno));
1.374 djm 566: return;
567: }
568:
569: *conn_in_readyp = (*pfdp)[0].revents != 0;
570: *conn_out_readyp = (*pfdp)[1].revents != 0;
571:
572: if (options.server_alive_interval > 0 && !*conn_in_readyp &&
573: monotime() >= server_alive_time) {
1.249 dtucker 574: /*
1.374 djm 575: * ServerAlive check is needed. We can't rely on the poll
1.345 dtucker 576: * timing out since traffic on the client side such as port
577: * forwards can keep waking it up.
1.249 dtucker 578: */
1.345 dtucker 579: server_alive_check(ssh);
1.374 djm 580: }
1.11 markus 581: }
582:
1.77 itojun 583: static void
1.315 markus 584: client_suspend_self(struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr)
1.1 deraadt 585: {
1.11 markus 586: /* Flush stdout and stderr buffers. */
1.315 markus 587: if (sshbuf_len(bout) > 0)
588: atomicio(vwrite, fileno(stdout), sshbuf_mutable_ptr(bout),
589: sshbuf_len(bout));
590: if (sshbuf_len(berr) > 0)
591: atomicio(vwrite, fileno(stderr), sshbuf_mutable_ptr(berr),
592: sshbuf_len(berr));
1.11 markus 593:
1.233 djm 594: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 595:
1.305 djm 596: sshbuf_reset(bin);
597: sshbuf_reset(bout);
598: sshbuf_reset(berr);
1.11 markus 599:
600: /* Send the suspend signal to the program itself. */
601: kill(getpid(), SIGTSTP);
602:
1.132 djm 603: /* Reset window sizes in case they have changed */
604: received_window_change_signal = 1;
1.11 markus 605:
1.233 djm 606: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 607: }
608:
1.77 itojun 609: static void
1.374 djm 610: client_process_net_input(struct ssh *ssh)
1.11 markus 611: {
1.378 djm 612: int r;
1.11 markus 613:
1.13 markus 614: /*
615: * Read input from the server, and add any such data to the buffer of
616: * the packet subsystem.
617: */
1.374 djm 618: schedule_server_alive_check();
1.378 djm 619: if ((r = ssh_packet_process_read(ssh, connection_in)) == 0)
620: return; /* success */
621: if (r == SSH_ERR_SYSTEM_ERROR) {
622: if (errno == EAGAIN || errno == EINTR)
623: return;
624: if (errno == EPIPE) {
625: quit_message("Connection to %s closed by remote host.",
626: host);
627: return;
628: }
1.11 markus 629: }
1.378 djm 630: quit_message("Read from remote host %s: %s", host, ssh_err(r));
1.17 markus 631: }
1.16 markus 632:
1.97 jakob 633: static void
1.303 djm 634: client_status_confirm(struct ssh *ssh, int type, Channel *c, void *ctx)
1.123 djm 635: {
1.190 djm 636: struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
637: char errmsg[256];
1.315 markus 638: int r, tochan;
1.190 djm 639:
1.234 djm 640: /*
641: * If a TTY was explicitly requested, then a failure to allocate
642: * one is fatal.
643: */
644: if (cr->action == CONFIRM_TTY &&
645: (options.request_tty == REQUEST_TTY_FORCE ||
646: options.request_tty == REQUEST_TTY_YES))
647: cr->action = CONFIRM_CLOSE;
648:
1.312 djm 649: /* XXX suppress on mux _client_ quietmode */
1.190 djm 650: tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
1.217 djm 651: c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
1.190 djm 652:
653: if (type == SSH2_MSG_CHANNEL_SUCCESS) {
654: debug2("%s request accepted on channel %d",
655: cr->request_type, c->self);
656: } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
657: if (tochan) {
658: snprintf(errmsg, sizeof(errmsg),
659: "%s request failed\r\n", cr->request_type);
660: } else {
661: snprintf(errmsg, sizeof(errmsg),
662: "%s request failed on channel %d",
663: cr->request_type, c->self);
664: }
665: /* If error occurred on primary session channel, then exit */
1.234 djm 666: if (cr->action == CONFIRM_CLOSE && c->self == session_ident)
1.190 djm 667: fatal("%s", errmsg);
1.234 djm 668: /*
669: * If error occurred on mux client, append to
670: * their stderr.
671: */
672: if (tochan) {
1.360 djm 673: debug3_f("channel %d: mux request: %s", c->self,
674: cr->request_type);
1.315 markus 675: if ((r = sshbuf_put(c->extended, errmsg,
676: strlen(errmsg))) != 0)
1.354 djm 677: fatal_fr(r, "sshbuf_put");
1.234 djm 678: } else
1.190 djm 679: error("%s", errmsg);
1.234 djm 680: if (cr->action == CONFIRM_TTY) {
681: /*
682: * If a TTY allocation error occurred, then arrange
683: * for the correct TTY to leave raw mode.
684: */
685: if (c->self == session_ident)
686: leave_raw_mode(0);
687: else
1.303 djm 688: mux_tty_alloc_failed(ssh, c);
1.234 djm 689: } else if (cr->action == CONFIRM_CLOSE) {
1.303 djm 690: chan_read_failed(ssh, c);
691: chan_write_failed(ssh, c);
1.190 djm 692: }
693: }
1.250 djm 694: free(cr);
1.190 djm 695: }
696:
697: static void
1.303 djm 698: client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx)
1.190 djm 699: {
1.250 djm 700: free(ctx);
1.190 djm 701: }
1.129 deraadt 702:
1.236 djm 703: void
1.303 djm 704: client_expect_confirm(struct ssh *ssh, int id, const char *request,
1.234 djm 705: enum confirm_action action)
1.190 djm 706: {
1.255 djm 707: struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr));
1.123 djm 708:
1.190 djm 709: cr->request_type = request;
1.234 djm 710: cr->action = action;
1.123 djm 711:
1.303 djm 712: channel_register_status_confirm(ssh, id, client_status_confirm,
1.190 djm 713: client_abandon_status_confirm, cr);
1.196 djm 714: }
715:
716: void
717: client_register_global_confirm(global_confirm_cb *cb, void *ctx)
718: {
1.201 djm 719: struct global_confirm *gc, *last_gc;
1.196 djm 720:
721: /* Coalesce identical callbacks */
1.201 djm 722: last_gc = TAILQ_LAST(&global_confirms, global_confirms);
723: if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
724: if (++last_gc->ref_count >= INT_MAX)
1.354 djm 725: fatal_f("last_gc->ref_count = %d",
726: last_gc->ref_count);
1.196 djm 727: return;
728: }
729:
1.255 djm 730: gc = xcalloc(1, sizeof(*gc));
1.196 djm 731: gc->cb = cb;
732: gc->ctx = ctx;
733: gc->ref_count = 1;
734: TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
1.123 djm 735: }
736:
1.384 djm 737: /*
738: * Returns non-zero if the client is able to handle a hostkeys-00@openssh.com
739: * hostkey update request.
740: */
741: static int
742: can_update_hostkeys(void)
743: {
744: if (hostkeys_update_complete)
745: return 0;
746: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK &&
747: options.batch_mode)
748: return 0; /* won't ask in batchmode, so don't even try */
749: if (!options.update_hostkeys || options.num_user_hostfiles <= 0)
750: return 0;
751: return 1;
752: }
753:
1.385 dtucker 754: static void
755: client_repledge(void)
1.384 djm 756: {
757: debug3_f("enter");
758:
759: /* Might be able to tighten pledge now that session is established */
760: if (options.control_master || options.control_path != NULL ||
761: options.forward_x11 || options.fork_after_authentication ||
762: can_update_hostkeys() ||
763: (session_ident != -1 && !session_setup_complete)) {
764: /* Can't tighten */
765: return;
766: }
767: /*
768: * LocalCommand and UpdateHostkeys have finished, so can get rid of
769: * filesystem.
770: *
771: * XXX protocol allows a server can to change hostkeys during the
772: * connection at rekey time that could trigger a hostkeys update
773: * but AFAIK no implementations support this. Could improve by
774: * forcing known_hosts to be read-only or via unveil(2).
775: */
776: if (options.num_local_forwards != 0 ||
777: options.num_remote_forwards != 0 ||
778: options.num_permitted_remote_opens != 0 ||
779: options.enable_escape_commandline != 0) {
780: /* rfwd needs inet */
781: debug("pledge: network");
782: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
783: fatal_f("pledge(): %s", strerror(errno));
784: } else if (options.forward_agent != 0) {
785: /* agent forwarding needs to open $SSH_AUTH_SOCK at will */
786: debug("pledge: agent");
787: if (pledge("stdio unix proc tty", NULL) == -1)
788: fatal_f("pledge(): %s", strerror(errno));
789: } else {
790: debug("pledge: fork");
791: if (pledge("stdio proc tty", NULL) == -1)
792: fatal_f("pledge(): %s", strerror(errno));
793: }
794: /* XXX further things to do:
795: *
796: * - might be able to get rid of proc if we kill ~^Z
797: * - ssh -N (no session)
798: * - stdio forwarding
799: * - sessions without tty
800: */
801: }
802:
1.123 djm 803: static void
1.303 djm 804: process_cmdline(struct ssh *ssh)
1.97 jakob 805: {
806: void (*handler)(int);
1.261 millert 807: char *s, *cmd;
808: int ok, delete = 0, local = 0, remote = 0, dynamic = 0;
809: struct Forward fwd;
1.97 jakob 810:
1.257 tedu 811: memset(&fwd, 0, sizeof(fwd));
1.183 djm 812:
1.233 djm 813: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.332 dtucker 814: handler = ssh_signal(SIGINT, SIG_IGN);
1.99 markus 815: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 816: if (s == NULL)
817: goto out;
1.256 deraadt 818: while (isspace((u_char)*s))
1.97 jakob 819: s++;
1.121 djm 820: if (*s == '-')
821: s++; /* Skip cmdline '-', if any */
1.120 dtucker 822: if (*s == '\0')
1.97 jakob 823: goto out;
1.121 djm 824:
1.122 djm 825: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 826: logit("Commands:");
1.164 djm 827: logit(" -L[bind_address:]port:host:hostport "
828: "Request local forward");
829: logit(" -R[bind_address:]port:host:hostport "
830: "Request remote forward");
1.204 stevesk 831: logit(" -D[bind_address:]port "
832: "Request dynamic forward");
1.237 markus 833: logit(" -KL[bind_address:]port "
834: "Cancel local forward");
1.165 stevesk 835: logit(" -KR[bind_address:]port "
1.164 djm 836: "Cancel remote forward");
1.237 markus 837: logit(" -KD[bind_address:]port "
838: "Cancel dynamic forward");
1.146 reyk 839: if (!options.permit_local_command)
840: goto out;
1.164 djm 841: logit(" !args "
842: "Execute local command");
1.146 reyk 843: goto out;
844: }
845:
846: if (*s == '!' && options.permit_local_command) {
847: s++;
848: ssh_local_cmd(s);
1.121 djm 849: goto out;
850: }
851:
852: if (*s == 'K') {
853: delete = 1;
854: s++;
855: }
1.204 stevesk 856: if (*s == 'L')
857: local = 1;
858: else if (*s == 'R')
859: remote = 1;
860: else if (*s == 'D')
861: dynamic = 1;
862: else {
1.109 itojun 863: logit("Invalid command.");
1.97 jakob 864: goto out;
865: }
1.204 stevesk 866:
1.256 deraadt 867: while (isspace((u_char)*++s))
1.179 tedu 868: ;
1.97 jakob 869:
1.217 djm 870: /* XXX update list of forwards in options */
1.121 djm 871: if (delete) {
1.261 millert 872: /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */
873: if (!parse_forward(&fwd, s, 1, 0)) {
874: logit("Bad forwarding close specification.");
1.121 djm 875: goto out;
876: }
1.237 markus 877: if (remote)
1.303 djm 878: ok = channel_request_rforward_cancel(ssh, &fwd) == 0;
1.237 markus 879: else if (dynamic)
1.303 djm 880: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 881: 0, &options.fwd_opts) > 0;
1.237 markus 882: else
1.303 djm 883: ok = channel_cancel_lport_listener(ssh, &fwd,
1.261 millert 884: CHANNEL_CANCEL_PORT_STATIC,
885: &options.fwd_opts) > 0;
1.237 markus 886: if (!ok) {
1.290 dtucker 887: logit("Unknown port forwarding.");
1.237 markus 888: goto out;
889: }
890: logit("Canceled forwarding.");
1.121 djm 891: } else {
1.382 dtucker 892: /* -R specs can be both dynamic or not, so check both. */
893: if (remote) {
894: if (!parse_forward(&fwd, s, 0, remote) &&
895: !parse_forward(&fwd, s, 1, remote)) {
896: logit("Bad remote forwarding specification.");
897: goto out;
898: }
899: } else if (!parse_forward(&fwd, s, dynamic, remote)) {
900: logit("Bad local forwarding specification.");
1.121 djm 901: goto out;
902: }
1.204 stevesk 903: if (local || dynamic) {
1.303 djm 904: if (!channel_setup_local_fwd_listener(ssh, &fwd,
1.261 millert 905: &options.fwd_opts)) {
1.121 djm 906: logit("Port forwarding failed.");
907: goto out;
908: }
1.135 djm 909: } else {
1.303 djm 910: if (channel_request_remote_forwarding(ssh, &fwd) < 0) {
1.167 markus 911: logit("Port forwarding failed.");
912: goto out;
913: }
1.135 djm 914: }
1.121 djm 915: logit("Forwarding port.");
916: }
917:
1.97 jakob 918: out:
1.332 dtucker 919: ssh_signal(SIGINT, handler);
1.233 djm 920: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.250 djm 921: free(cmd);
922: free(fwd.listen_host);
1.261 millert 923: free(fwd.listen_path);
1.250 djm 924: free(fwd.connect_host);
1.261 millert 925: free(fwd.connect_path);
1.97 jakob 926: }
927:
1.244 dtucker 928: /* reasons to suppress output of an escape command in help output */
929: #define SUPPRESS_NEVER 0 /* never suppress, always show */
1.292 djm 930: #define SUPPRESS_MUXCLIENT 1 /* don't show in mux client sessions */
931: #define SUPPRESS_MUXMASTER 2 /* don't show in mux master sessions */
932: #define SUPPRESS_SYSLOG 4 /* don't show when logging to syslog */
1.383 djm 933: #define SUPPRESS_NOCMDLINE 8 /* don't show when cmdline disabled*/
1.244 dtucker 934: struct escape_help_text {
935: const char *cmd;
936: const char *text;
937: unsigned int flags;
938: };
939: static struct escape_help_text esc_txt[] = {
940: {".", "terminate session", SUPPRESS_MUXMASTER},
941: {".", "terminate connection (and any multiplexed sessions)",
942: SUPPRESS_MUXCLIENT},
1.292 djm 943: {"B", "send a BREAK to the remote system", SUPPRESS_NEVER},
1.383 djm 944: {"C", "open a command line", SUPPRESS_MUXCLIENT|SUPPRESS_NOCMDLINE},
1.292 djm 945: {"R", "request rekey", SUPPRESS_NEVER},
1.246 dtucker 946: {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT},
1.244 dtucker 947: {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT},
948: {"#", "list forwarded connections", SUPPRESS_NEVER},
949: {"&", "background ssh (when waiting for connections to terminate)",
950: SUPPRESS_MUXCLIENT},
951: {"?", "this message", SUPPRESS_NEVER},
952: };
953:
954: static void
1.315 markus 955: print_escape_help(struct sshbuf *b, int escape_char, int mux_client,
956: int using_stderr)
1.244 dtucker 957: {
958: unsigned int i, suppress_flags;
1.315 markus 959: int r;
1.244 dtucker 960:
1.315 markus 961: if ((r = sshbuf_putf(b,
962: "%c?\r\nSupported escape sequences:\r\n", escape_char)) != 0)
1.354 djm 963: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 964:
1.292 djm 965: suppress_flags =
1.244 dtucker 966: (mux_client ? SUPPRESS_MUXCLIENT : 0) |
967: (mux_client ? 0 : SUPPRESS_MUXMASTER) |
1.383 djm 968: (using_stderr ? 0 : SUPPRESS_SYSLOG) |
969: (options.enable_escape_commandline == 0 ? SUPPRESS_NOCMDLINE : 0);
1.244 dtucker 970:
971: for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) {
972: if (esc_txt[i].flags & suppress_flags)
973: continue;
1.315 markus 974: if ((r = sshbuf_putf(b, " %c%-3s - %s\r\n",
975: escape_char, esc_txt[i].cmd, esc_txt[i].text)) != 0)
1.354 djm 976: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 977: }
978:
1.315 markus 979: if ((r = sshbuf_putf(b,
1.246 dtucker 980: " %c%c - send the escape character by typing it twice\r\n"
1.244 dtucker 981: "(Note that escapes are only recognized immediately after "
1.315 markus 982: "newline.)\r\n", escape_char, escape_char)) != 0)
1.354 djm 983: fatal_fr(r, "sshbuf_putf");
1.244 dtucker 984: }
985:
1.314 djm 986: /*
1.296 naddy 987: * Process the characters one by one.
1.195 djm 988: */
1.77 itojun 989: static int
1.303 djm 990: process_escapes(struct ssh *ssh, Channel *c,
1.315 markus 991: struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr,
1.195 djm 992: char *buf, int len)
1.31 markus 993: {
994: pid_t pid;
1.315 markus 995: int r, bytes = 0;
1.42 markus 996: u_int i;
997: u_char ch;
1.31 markus 998: char *s;
1.294 djm 999: struct escape_filter_ctx *efc = c->filter_ctx == NULL ?
1000: NULL : (struct escape_filter_ctx *)c->filter_ctx;
1.31 markus 1001:
1.294 djm 1002: if (c->filter_ctx == NULL)
1003: return 0;
1.314 djm 1004:
1.139 djm 1005: if (len <= 0)
1006: return (0);
1007:
1008: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1009: /* Get one character at a time. */
1010: ch = buf[i];
1011:
1.294 djm 1012: if (efc->escape_pending) {
1.31 markus 1013: /* We have previously seen an escape character. */
1014: /* Clear the flag now. */
1.294 djm 1015: efc->escape_pending = 0;
1.31 markus 1016:
1017: /* Process the escaped character. */
1018: switch (ch) {
1019: case '.':
1020: /* Terminate the connection. */
1.315 markus 1021: if ((r = sshbuf_putf(berr, "%c.\r\n",
1022: efc->escape_char)) != 0)
1.354 djm 1023: fatal_fr(r, "sshbuf_putf");
1.217 djm 1024: if (c && c->ctl_chan != -1) {
1.387 djm 1025: channel_force_close(ssh, c, 1);
1.195 djm 1026: return 0;
1027: } else
1028: quit_pending = 1;
1.31 markus 1029: return -1;
1030:
1031: case 'Z' - 64:
1.195 djm 1032: /* XXX support this for mux clients */
1.217 djm 1033: if (c && c->ctl_chan != -1) {
1.245 dtucker 1034: char b[16];
1.195 djm 1035: noescape:
1.245 dtucker 1036: if (ch == 'Z' - 64)
1037: snprintf(b, sizeof b, "^Z");
1038: else
1039: snprintf(b, sizeof b, "%c", ch);
1.315 markus 1040: if ((r = sshbuf_putf(berr,
1.245 dtucker 1041: "%c%s escape not available to "
1.195 djm 1042: "multiplexed sessions\r\n",
1.315 markus 1043: efc->escape_char, b)) != 0)
1.354 djm 1044: fatal_fr(r, "sshbuf_putf");
1.195 djm 1045: continue;
1046: }
1.197 djm 1047: /* Suspend the program. Inform the user */
1.315 markus 1048: if ((r = sshbuf_putf(berr,
1049: "%c^Z [suspend ssh]\r\n",
1050: efc->escape_char)) != 0)
1.354 djm 1051: fatal_fr(r, "sshbuf_putf");
1.31 markus 1052:
1053: /* Restore terminal modes and suspend. */
1054: client_suspend_self(bin, bout, berr);
1055:
1056: /* We have been continued. */
1057: continue;
1058:
1.111 markus 1059: case 'B':
1.315 markus 1060: if ((r = sshbuf_putf(berr,
1061: "%cB\r\n", efc->escape_char)) != 0)
1.354 djm 1062: fatal_fr(r, "sshbuf_putf");
1.303 djm 1063: channel_request_start(ssh, c->self, "break", 0);
1.315 markus 1064: if ((r = sshpkt_put_u32(ssh, 1000)) != 0 ||
1065: (r = sshpkt_send(ssh)) != 0)
1.354 djm 1066: fatal_fr(r, "send packet");
1.111 markus 1067: continue;
1068:
1.54 markus 1069: case 'R':
1.357 djm 1070: if (ssh->compat & SSH_BUG_NOREKEY)
1.292 djm 1071: logit("Server does not "
1072: "support re-keying");
1073: else
1074: need_rekeying = 1;
1.54 markus 1075: continue;
1076:
1.242 dtucker 1077: case 'V':
1078: /* FALLTHROUGH */
1079: case 'v':
1080: if (c && c->ctl_chan != -1)
1081: goto noescape;
1082: if (!log_is_on_stderr()) {
1.315 markus 1083: if ((r = sshbuf_putf(berr,
1.242 dtucker 1084: "%c%c [Logging to syslog]\r\n",
1.315 markus 1085: efc->escape_char, ch)) != 0)
1.354 djm 1086: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1087: continue;
1088: }
1089: if (ch == 'V' && options.log_level >
1090: SYSLOG_LEVEL_QUIET)
1091: log_change_level(--options.log_level);
1092: if (ch == 'v' && options.log_level <
1093: SYSLOG_LEVEL_DEBUG3)
1094: log_change_level(++options.log_level);
1.315 markus 1095: if ((r = sshbuf_putf(berr,
1.294 djm 1096: "%c%c [LogLevel %s]\r\n",
1097: efc->escape_char, ch,
1.315 markus 1098: log_level_name(options.log_level))) != 0)
1.354 djm 1099: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1100: continue;
1101:
1.31 markus 1102: case '&':
1.217 djm 1103: if (c && c->ctl_chan != -1)
1.195 djm 1104: goto noescape;
1.31 markus 1105: /*
1.197 djm 1106: * Detach the program (continue to serve
1107: * connections, but put in background and no
1108: * more new connections).
1.31 markus 1109: */
1110: /* Restore tty modes. */
1.233 djm 1111: leave_raw_mode(
1112: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1113:
1114: /* Stop listening for new connections. */
1.303 djm 1115: channel_stop_listening(ssh);
1.31 markus 1116:
1.354 djm 1117: if ((r = sshbuf_putf(berr, "%c& "
1118: "[backgrounded]\n", efc->escape_char)) != 0)
1119: fatal_fr(r, "sshbuf_putf");
1.31 markus 1120:
1121: /* Fork into background. */
1122: pid = fork();
1.326 deraadt 1123: if (pid == -1) {
1.31 markus 1124: error("fork: %.100s", strerror(errno));
1125: continue;
1126: }
1127: if (pid != 0) { /* This is the parent. */
1128: /* The parent just exits. */
1129: exit(0);
1130: }
1131: /* The child continues serving connections. */
1.292 djm 1132: /* fake EOF on stdin */
1.315 markus 1133: if ((r = sshbuf_put_u8(bin, 4)) != 0)
1.354 djm 1134: fatal_fr(r, "sshbuf_put_u8");
1.292 djm 1135: return -1;
1.31 markus 1136: case '?':
1.294 djm 1137: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1138: (c && c->ctl_chan != -1),
1139: log_is_on_stderr());
1.31 markus 1140: continue;
1141:
1142: case '#':
1.315 markus 1143: if ((r = sshbuf_putf(berr, "%c#\r\n",
1144: efc->escape_char)) != 0)
1.354 djm 1145: fatal_fr(r, "sshbuf_putf");
1.303 djm 1146: s = channel_open_message(ssh);
1.315 markus 1147: if ((r = sshbuf_put(berr, s, strlen(s))) != 0)
1.354 djm 1148: fatal_fr(r, "sshbuf_put");
1.250 djm 1149: free(s);
1.97 jakob 1150: continue;
1151:
1152: case 'C':
1.217 djm 1153: if (c && c->ctl_chan != -1)
1.206 djm 1154: goto noescape;
1.383 djm 1155: if (options.enable_escape_commandline == 0) {
1156: if ((r = sshbuf_putf(berr,
1157: "commandline disabled\r\n")) != 0)
1158: fatal_fr(r, "sshbuf_putf");
1159: continue;
1160: }
1.303 djm 1161: process_cmdline(ssh);
1.31 markus 1162: continue;
1163:
1164: default:
1.294 djm 1165: if (ch != efc->escape_char) {
1.315 markus 1166: if ((r = sshbuf_put_u8(bin,
1167: efc->escape_char)) != 0)
1.354 djm 1168: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1169: bytes++;
1170: }
1171: /* Escaped characters fall through here */
1172: break;
1173: }
1174: } else {
1175: /*
1.197 djm 1176: * The previous character was not an escape char.
1177: * Check if this is an escape.
1.31 markus 1178: */
1.294 djm 1179: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1180: /*
1181: * It is. Set the flag and continue to
1182: * next character.
1183: */
1.294 djm 1184: efc->escape_pending = 1;
1.31 markus 1185: continue;
1186: }
1187: }
1188:
1189: /*
1190: * Normal character. Record whether it was a newline,
1191: * and append it to the buffer.
1192: */
1193: last_was_cr = (ch == '\r' || ch == '\n');
1.315 markus 1194: if ((r = sshbuf_put_u8(bin, ch)) != 0)
1.354 djm 1195: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1196: bytes++;
1197: }
1198: return bytes;
1199: }
1200:
1.13 markus 1201: /*
1.15 markus 1202: * Get packets from the connection input buffer, and process them as long as
1203: * there are packets available.
1204: *
1205: * Any unknown packets received during the actual
1206: * session cause the session to terminate. This is
1207: * intended to make debugging easier since no
1208: * confirmations are sent. Any compatible protocol
1209: * extensions must be negotiated during the
1210: * preparatory phase.
1211: */
1212:
1.77 itojun 1213: static void
1.321 djm 1214: client_process_buffered_input_packets(struct ssh *ssh)
1.15 markus 1215: {
1.321 djm 1216: ssh_dispatch_run_fatal(ssh, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1217: }
1218:
1.31 markus 1219: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1220:
1.195 djm 1221: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1222: void *
1223: client_new_escape_filter_ctx(int escape_char)
1224: {
1225: struct escape_filter_ctx *ret;
1226:
1.255 djm 1227: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1228: ret->escape_pending = 0;
1229: ret->escape_char = escape_char;
1230: return (void *)ret;
1231: }
1232:
1.198 djm 1233: /* Free the escape filter context on channel free */
1234: void
1.303 djm 1235: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1236: {
1.250 djm 1237: free(ctx);
1.198 djm 1238: }
1239:
1.195 djm 1240: int
1.303 djm 1241: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1242: {
1.190 djm 1243: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1244: return 0;
1245:
1.303 djm 1246: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1247: buf, len);
1.30 markus 1248: }
1249:
1.77 itojun 1250: static void
1.387 djm 1251: client_channel_closed(struct ssh *ssh, int id, int force, void *arg)
1.60 markus 1252: {
1.303 djm 1253: channel_cancel_cleanup(ssh, id);
1.60 markus 1254: session_closed = 1;
1.233 djm 1255: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1256: }
1257:
1.15 markus 1258: /*
1.13 markus 1259: * Implements the interactive session with the server. This is called after
1260: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1261: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1262: * used as an escape character for terminating or suspending the session.
1.13 markus 1263: */
1.20 markus 1264: int
1.303 djm 1265: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1266: int ssh2_chan_id)
1.1 deraadt 1267: {
1.374 djm 1268: struct pollfd *pfd = NULL;
1269: u_int npfd_alloc = 0, npfd_active = 0;
1.11 markus 1270: double start_time, total_time;
1.374 djm 1271: int r, len;
1.200 markus 1272: u_int64_t ibytes, obytes;
1.374 djm 1273: int conn_in_ready, conn_out_ready;
1.11 markus 1274:
1275: debug("Entering interactive session.");
1.384 djm 1276: session_ident = ssh2_chan_id;
1.277 semarie 1277:
1.278 semarie 1278: if (options.control_master &&
1.286 djm 1279: !option_clear_or_none(options.control_path)) {
1.278 semarie 1280: debug("pledge: id");
1.327 mestre 1281: if (pledge("stdio rpath wpath cpath unix inet dns recvfd sendfd proc exec id tty",
1.278 semarie 1282: NULL) == -1)
1.354 djm 1283: fatal_f("pledge(): %s", strerror(errno));
1.278 semarie 1284:
1285: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1286: debug("pledge: exec");
1287: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1288: NULL) == -1)
1.354 djm 1289: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1290:
1291: } else if (options.update_hostkeys) {
1.373 jsg 1292: debug("pledge: filesystem");
1.277 semarie 1293: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1294: NULL) == -1)
1.354 djm 1295: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1296:
1.286 djm 1297: } else if (!option_clear_or_none(options.proxy_command) ||
1.369 djm 1298: options.fork_after_authentication) {
1.277 semarie 1299: debug("pledge: proc");
1300: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1.354 djm 1301: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1302:
1303: } else {
1304: debug("pledge: network");
1.300 mestre 1305: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.354 djm 1306: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1307: }
1.11 markus 1308:
1.384 djm 1309: /* might be able to tighten now */
1310: client_repledge();
1311:
1.307 dtucker 1312: start_time = monotime_double();
1.11 markus 1313:
1314: /* Initialize variables. */
1315: last_was_cr = 1;
1316: exit_status = -1;
1.320 djm 1317: connection_in = ssh_packet_get_connection_in(ssh);
1318: connection_out = ssh_packet_get_connection_out(ssh);
1.46 markus 1319:
1.11 markus 1320: quit_pending = 0;
1321:
1.315 markus 1322: /* Initialize buffer. */
1323: if ((stderr_buffer = sshbuf_new()) == NULL)
1.354 djm 1324: fatal_f("sshbuf_new failed");
1.11 markus 1325:
1.321 djm 1326: client_init_dispatch(ssh);
1.15 markus 1327:
1.105 markus 1328: /*
1329: * Set signal handlers, (e.g. to restore non-blocking mode)
1330: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1331: */
1.332 dtucker 1332: if (ssh_signal(SIGHUP, SIG_IGN) != SIG_IGN)
1333: ssh_signal(SIGHUP, signal_handler);
1334: if (ssh_signal(SIGINT, SIG_IGN) != SIG_IGN)
1335: ssh_signal(SIGINT, signal_handler);
1336: if (ssh_signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1337: ssh_signal(SIGQUIT, signal_handler);
1338: if (ssh_signal(SIGTERM, SIG_IGN) != SIG_IGN)
1339: ssh_signal(SIGTERM, signal_handler);
1340: ssh_signal(SIGWINCH, window_change_handler);
1.11 markus 1341:
1342: if (have_pty)
1.233 djm 1343: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1344:
1.292 djm 1345: if (session_ident != -1) {
1346: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1347: channel_register_filter(ssh, session_ident,
1.292 djm 1348: client_simple_escape_filter, NULL,
1349: client_filter_cleanup,
1350: client_new_escape_filter_ctx(
1351: escape_char_arg));
1.232 djm 1352: }
1.303 djm 1353: channel_register_cleanup(ssh, session_ident,
1.292 djm 1354: client_channel_closed, 0);
1.48 markus 1355: }
1.345 dtucker 1356:
1357: schedule_server_alive_check();
1.30 markus 1358:
1.11 markus 1359: /* Main loop of the client for the interactive session mode. */
1360: while (!quit_pending) {
1361:
1.13 markus 1362: /* Process buffered packets sent by the server. */
1.321 djm 1363: client_process_buffered_input_packets(ssh);
1.11 markus 1364:
1.303 djm 1365: if (session_closed && !channel_still_open(ssh))
1.60 markus 1366: break;
1367:
1.303 djm 1368: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1369: debug("rekeying in progress");
1.284 djm 1370: } else if (need_rekeying) {
1371: /* manual rekey request */
1372: debug("need rekeying");
1.303 djm 1373: if ((r = kex_start_rekex(ssh)) != 0)
1.354 djm 1374: fatal_fr(r, "kex_start_rekex");
1.284 djm 1375: need_rekeying = 0;
1.56 markus 1376: } else {
1377: /*
1378: * Make packets from buffered channel data, and
1379: * enqueue them for sending to the server.
1380: */
1.320 djm 1381: if (ssh_packet_not_very_much_data_to_write(ssh))
1.303 djm 1382: channel_output_poll(ssh);
1.11 markus 1383:
1.56 markus 1384: /*
1385: * Check if the window size has changed, and buffer a
1386: * message about it to the server if so.
1387: */
1.303 djm 1388: client_check_window_change(ssh);
1.11 markus 1389:
1.56 markus 1390: if (quit_pending)
1391: break;
1392: }
1.13 markus 1393: /*
1394: * Wait until we have something to do (something becomes
1395: * available on one of the descriptors).
1396: */
1.374 djm 1397: client_wait_until_can_do_something(ssh, &pfd, &npfd_alloc,
1398: &npfd_active, ssh_packet_is_rekeying(ssh),
1399: &conn_in_ready, &conn_out_ready);
1.11 markus 1400:
1401: if (quit_pending)
1402: break;
1403:
1.379 djm 1404: /* Do channel operations. */
1405: channel_after_poll(ssh, pfd, npfd_active);
1.11 markus 1406:
1.17 markus 1407: /* Buffer input from the connection. */
1.374 djm 1408: if (conn_in_ready)
1409: client_process_net_input(ssh);
1.17 markus 1410:
1411: if (quit_pending)
1412: break;
1.367 djm 1413:
1414: /* A timeout may have triggered rekeying */
1415: if ((r = ssh_packet_check_rekey(ssh)) != 0)
1416: fatal_fr(r, "cannot start rekeying");
1.11 markus 1417:
1.197 djm 1418: /*
1419: * Send as much buffered packet data as possible to the
1420: * sender.
1421: */
1.374 djm 1422: if (conn_out_ready) {
1.338 djm 1423: if ((r = ssh_packet_write_poll(ssh)) != 0) {
1424: sshpkt_fatal(ssh, r,
1425: "%s: ssh_packet_write_poll", __func__);
1426: }
1427: }
1.222 djm 1428:
1429: /*
1430: * If we are a backgrounded control master, and the
1431: * timeout has expired without any active client
1432: * connections, then quit.
1433: */
1434: if (control_persist_exit_time > 0) {
1.251 dtucker 1435: if (monotime() >= control_persist_exit_time) {
1.222 djm 1436: debug("ControlPersist timeout expired");
1437: break;
1438: }
1439: }
1.11 markus 1440: }
1.374 djm 1441: free(pfd);
1.11 markus 1442:
1443: /* Terminate the session. */
1444:
1445: /* Stop watching for window change. */
1.332 dtucker 1446: ssh_signal(SIGWINCH, SIG_DFL);
1.211 andreas 1447:
1.320 djm 1448: if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
1449: (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_BY_APPLICATION)) != 0 ||
1450: (r = sshpkt_put_cstring(ssh, "disconnected by user")) != 0 ||
1451: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* language tag */
1452: (r = sshpkt_send(ssh)) != 0 ||
1453: (r = ssh_packet_write_wait(ssh)) != 0)
1.354 djm 1454: fatal_fr(r, "send disconnect");
1.11 markus 1455:
1.303 djm 1456: channel_free_all(ssh);
1.11 markus 1457:
1.75 markus 1458: if (have_pty)
1.233 djm 1459: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.116 dtucker 1460:
1461: /*
1462: * If there was no shell or command requested, there will be no remote
1463: * exit status to be returned. In that case, clear error code if the
1464: * connection was deliberately terminated at this end.
1465: */
1.370 djm 1466: if (options.session_type == SESSION_TYPE_NONE &&
1467: received_signal == SIGTERM) {
1.116 dtucker 1468: received_signal = 0;
1469: exit_status = 0;
1470: }
1.75 markus 1471:
1.301 dtucker 1472: if (received_signal) {
1473: verbose("Killed by signal %d.", (int) received_signal);
1.359 djm 1474: cleanup_exit(255);
1.301 dtucker 1475: }
1.75 markus 1476:
1.13 markus 1477: /*
1478: * In interactive mode (with pseudo tty) display a message indicating
1479: * that the connection has been closed.
1480: */
1.377 djm 1481: if (have_pty && options.log_level >= SYSLOG_LEVEL_INFO)
1482: quit_message("Connection to %s closed.", host);
1.70 markus 1483:
1.11 markus 1484: /* Output any buffered data for stderr. */
1.315 markus 1485: if (sshbuf_len(stderr_buffer) > 0) {
1.230 djm 1486: len = atomicio(vwrite, fileno(stderr),
1.315 markus 1487: (u_char *)sshbuf_ptr(stderr_buffer),
1488: sshbuf_len(stderr_buffer));
1489: if (len < 0 || (u_int)len != sshbuf_len(stderr_buffer))
1.11 markus 1490: error("Write failed flushing stderr buffer.");
1.315 markus 1491: else if ((r = sshbuf_consume(stderr_buffer, len)) != 0)
1.354 djm 1492: fatal_fr(r, "sshbuf_consume");
1.11 markus 1493: }
1494:
1495: /* Clear and free any buffers. */
1.315 markus 1496: sshbuf_free(stderr_buffer);
1.11 markus 1497:
1498: /* Report bytes transferred, and transfer rates. */
1.307 dtucker 1499: total_time = monotime_double() - start_time;
1.320 djm 1500: ssh_packet_get_bytes(ssh, &ibytes, &obytes);
1.200 markus 1501: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1502: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1503: if (total_time > 0)
1.200 markus 1504: verbose("Bytes per second: sent %.1f, received %.1f",
1505: obytes / total_time, ibytes / total_time);
1.11 markus 1506: /* Return the exit status of the program. */
1507: debug("Exit status %d", exit_status);
1508: return exit_status;
1.15 markus 1509: }
1510:
1511: /*********/
1512:
1.77 itojun 1513: static Channel *
1.303 djm 1514: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1515: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1516: {
1.103 deraadt 1517: Channel *c = NULL;
1.289 markus 1518: struct sshbuf *b = NULL;
1.40 markus 1519: char *listen_address, *originator_address;
1.320 djm 1520: u_int listen_port, originator_port;
1.289 markus 1521: int r;
1.40 markus 1522:
1523: /* Get rest of the packet */
1.320 djm 1524: if ((r = sshpkt_get_cstring(ssh, &listen_address, NULL)) != 0 ||
1525: (r = sshpkt_get_u32(ssh, &listen_port)) != 0 ||
1526: (r = sshpkt_get_cstring(ssh, &originator_address, NULL)) != 0 ||
1527: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1528: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1529: fatal_fr(r, "parse packet");
1.40 markus 1530:
1.354 djm 1531: debug_f("listen %s port %d, originator %s port %d",
1.261 millert 1532: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1533:
1.320 djm 1534: if (listen_port > 0xffff)
1.354 djm 1535: error_f("invalid listen port");
1.320 djm 1536: else if (originator_port > 0xffff)
1.354 djm 1537: error_f("invalid originator port");
1.320 djm 1538: else {
1539: c = channel_connect_by_listen_address(ssh,
1540: listen_address, listen_port, "forwarded-tcpip",
1541: originator_address);
1542: }
1.40 markus 1543:
1.289 markus 1544: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1545: if ((b = sshbuf_new()) == NULL) {
1.354 djm 1546: error_f("alloc reply");
1.289 markus 1547: goto out;
1548: }
1549: /* reconstruct and send to muxclient */
1550: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1551: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1552: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1553: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1554: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1555: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1556: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1557: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1558: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1559: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1560: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.354 djm 1561: error_fr(r, "compose for muxclient");
1.289 markus 1562: goto out;
1563: }
1564: }
1565:
1566: out:
1567: sshbuf_free(b);
1.250 djm 1568: free(originator_address);
1569: free(listen_address);
1.40 markus 1570: return c;
1571: }
1572:
1.103 deraadt 1573: static Channel *
1.303 djm 1574: client_request_forwarded_streamlocal(struct ssh *ssh,
1575: const char *request_type, int rchan)
1.261 millert 1576: {
1577: Channel *c = NULL;
1578: char *listen_path;
1.320 djm 1579: int r;
1.261 millert 1580:
1581: /* Get the remote path. */
1.320 djm 1582: if ((r = sshpkt_get_cstring(ssh, &listen_path, NULL)) != 0 ||
1583: (r = sshpkt_get_string(ssh, NULL, NULL)) != 0 || /* reserved */
1584: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1585: fatal_fr(r, "parse packet");
1.261 millert 1586:
1.354 djm 1587: debug_f("request: %s", listen_path);
1.261 millert 1588:
1.303 djm 1589: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1590: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1591: free(listen_path);
1592: return c;
1593: }
1594:
1595: static Channel *
1.303 djm 1596: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1597: {
1598: Channel *c = NULL;
1599: char *originator;
1.321 djm 1600: u_int originator_port;
1.320 djm 1601: int r, sock;
1.40 markus 1602:
1603: if (!options.forward_x11) {
1604: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1605: error("Warning: this is probably a break-in attempt by a "
1606: "malicious server.");
1.221 djm 1607: return NULL;
1608: }
1.388 dtucker 1609: if (x11_refuse_time != 0 && monotime() >= x11_refuse_time) {
1.221 djm 1610: verbose("Rejected X11 connection after ForwardX11Timeout "
1611: "expired");
1.40 markus 1612: return NULL;
1613: }
1.320 djm 1614: if ((r = sshpkt_get_cstring(ssh, &originator, NULL)) != 0 ||
1.321 djm 1615: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1.320 djm 1616: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1617: fatal_fr(r, "parse packet");
1.40 markus 1618: /* XXX check permission */
1.321 djm 1619: /* XXX range check originator port? */
1620: debug("client_request_x11: request from %s %u", originator,
1.47 markus 1621: originator_port);
1.250 djm 1622: free(originator);
1.303 djm 1623: sock = x11_connect_display(ssh);
1.67 markus 1624: if (sock < 0)
1625: return NULL;
1.303 djm 1626: c = channel_new(ssh, "x11",
1.67 markus 1627: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1628: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1629: c->force_drain = 1;
1.40 markus 1630: return c;
1631: }
1632:
1.103 deraadt 1633: static Channel *
1.303 djm 1634: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1635: {
1636: Channel *c = NULL;
1.262 djm 1637: int r, sock;
1.40 markus 1638:
1639: if (!options.forward_agent) {
1640: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1641: error("Warning: this is probably a break-in attempt by a "
1642: "malicious server.");
1.40 markus 1643: return NULL;
1644: }
1.330 djm 1645: if (forward_agent_sock_path == NULL) {
1646: r = ssh_get_authentication_socket(&sock);
1647: } else {
1648: r = ssh_get_authentication_socket_path(forward_agent_sock_path, &sock);
1649: }
1650: if (r != 0) {
1.262 djm 1651: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.354 djm 1652: debug_fr(r, "ssh_get_authentication_socket");
1.67 markus 1653: return NULL;
1.262 djm 1654: }
1.372 djm 1655: if ((r = ssh_agent_bind_hostkey(sock, ssh->kex->initial_hostkey,
1656: ssh->kex->session_id, ssh->kex->initial_sig, 1)) == 0)
1657: debug_f("bound agent to hostkey");
1658: else
1659: debug2_fr(r, "ssh_agent_bind_hostkey");
1660:
1.303 djm 1661: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1662: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1663: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1664: "authentication agent connection", 1);
1.82 markus 1665: c->force_drain = 1;
1.40 markus 1666: return c;
1.180 djm 1667: }
1668:
1.306 djm 1669: char *
1.303 djm 1670: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1.343 djm 1671: int local_tun, int remote_tun, channel_open_fn *cb, void *cbctx)
1.180 djm 1672: {
1673: Channel *c;
1.320 djm 1674: int r, fd;
1.306 djm 1675: char *ifname = NULL;
1.180 djm 1676:
1677: if (tun_mode == SSH_TUNMODE_NO)
1678: return 0;
1679:
1680: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1681:
1682: /* Open local tunnel device */
1.306 djm 1683: if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) {
1.180 djm 1684: error("Tunnel device open failed.");
1.306 djm 1685: return NULL;
1.180 djm 1686: }
1.306 djm 1687: debug("Tunnel forwarding using interface %s", ifname);
1.180 djm 1688:
1.303 djm 1689: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1690: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1691: c->datagram = 1;
1.343 djm 1692:
1693: if (cb != NULL)
1694: channel_register_open_confirm(ssh, c->self, cb, cbctx);
1.180 djm 1695:
1.320 djm 1696: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1697: (r = sshpkt_put_cstring(ssh, "tun@openssh.com")) != 0 ||
1698: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1699: (r = sshpkt_put_u32(ssh, c->local_window_max)) != 0 ||
1700: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1701: (r = sshpkt_put_u32(ssh, tun_mode)) != 0 ||
1702: (r = sshpkt_put_u32(ssh, remote_tun)) != 0 ||
1703: (r = sshpkt_send(ssh)) != 0)
1.321 djm 1704: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.180 djm 1705:
1.306 djm 1706: return ifname;
1.40 markus 1707: }
1708:
1.22 markus 1709: /* XXXX move to generic input handler */
1.264 markus 1710: static int
1.297 markus 1711: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1712: {
1713: Channel *c = NULL;
1.320 djm 1714: char *ctype = NULL;
1715: int r;
1716: u_int rchan;
1717: size_t len;
1718: u_int rmaxpack, rwindow;
1719:
1720: if ((r = sshpkt_get_cstring(ssh, &ctype, &len)) != 0 ||
1721: (r = sshpkt_get_u32(ssh, &rchan)) != 0 ||
1722: (r = sshpkt_get_u32(ssh, &rwindow)) != 0 ||
1723: (r = sshpkt_get_u32(ssh, &rmaxpack)) != 0)
1724: goto out;
1.22 markus 1725:
1.24 markus 1726: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1727: ctype, rchan, rwindow, rmaxpack);
1728:
1.40 markus 1729: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1730: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1731: rmaxpack);
1.261 millert 1732: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1733: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1734: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1735: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1736: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1737: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1738: }
1.289 markus 1739: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1740: debug3("proxied to downstream: %s", ctype);
1741: } else if (c != NULL) {
1.22 markus 1742: debug("confirm %s", ctype);
1743: c->remote_id = rchan;
1.304 djm 1744: c->have_remote_id = 1;
1.22 markus 1745: c->remote_window = rwindow;
1746: c->remote_maxpacket = rmaxpack;
1.69 markus 1747: if (c->type != SSH_CHANNEL_CONNECTING) {
1.320 djm 1748: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
1749: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1750: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1751: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1752: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1753: (r = sshpkt_send(ssh)) != 0)
1754: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.69 markus 1755: }
1.22 markus 1756: } else {
1757: debug("failure %s", ctype);
1.320 djm 1758: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE)) != 0 ||
1759: (r = sshpkt_put_u32(ssh, rchan)) != 0 ||
1760: (r = sshpkt_put_u32(ssh, SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED)) != 0 ||
1761: (r = sshpkt_put_cstring(ssh, "open failed")) != 0 ||
1762: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
1763: (r = sshpkt_send(ssh)) != 0)
1764: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.22 markus 1765: }
1.320 djm 1766: r = 0;
1767: out:
1.250 djm 1768: free(ctype);
1.320 djm 1769: return r;
1.22 markus 1770: }
1.267 djm 1771:
1.264 markus 1772: static int
1.297 markus 1773: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1774: {
1775: Channel *c = NULL;
1.320 djm 1776: char *rtype = NULL;
1777: u_char reply;
1778: u_int id, exitval;
1779: int r, success = 0;
1780:
1781: if ((r = sshpkt_get_u32(ssh, &id)) != 0)
1782: return r;
1783: if (id <= INT_MAX)
1784: c = channel_lookup(ssh, id);
1.297 markus 1785: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1786: return 0;
1.320 djm 1787: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
1788: (r = sshpkt_get_u8(ssh, &reply)) != 0)
1789: goto out;
1.48 markus 1790:
1.320 djm 1791: debug("client_input_channel_req: channel %u rtype %s reply %d",
1.48 markus 1792: id, rtype, reply);
1793:
1.320 djm 1794: if (c == NULL) {
1.197 djm 1795: error("client_input_channel_req: channel %d: "
1796: "unknown channel", id);
1.193 markus 1797: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1.320 djm 1798: if ((r = sshpkt_get_end(ssh)) != 0)
1799: goto out;
1.303 djm 1800: chan_rcvd_eow(ssh, c);
1.48 markus 1801: } else if (strcmp(rtype, "exit-status") == 0) {
1.320 djm 1802: if ((r = sshpkt_get_u32(ssh, &exitval)) != 0)
1803: goto out;
1.217 djm 1804: if (c->ctl_chan != -1) {
1.303 djm 1805: mux_exit_message(ssh, c, exitval);
1.215 djm 1806: success = 1;
1.320 djm 1807: } else if ((int)id == session_ident) {
1.215 djm 1808: /* Record exit value of local session */
1.123 djm 1809: success = 1;
1810: exit_status = exitval;
1.215 djm 1811: } else {
1.218 djm 1812: /* Probably for a mux channel that has already closed */
1.354 djm 1813: debug_f("no sink for exit-status on channel %d",
1814: id);
1.123 djm 1815: }
1.320 djm 1816: if ((r = sshpkt_get_end(ssh)) != 0)
1817: goto out;
1.48 markus 1818: }
1.259 djm 1819: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1820: if (!c->have_remote_id)
1.354 djm 1821: fatal_f("channel %d: no remote_id", c->self);
1.320 djm 1822: if ((r = sshpkt_start(ssh, success ?
1823: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE)) != 0 ||
1824: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1825: (r = sshpkt_send(ssh)) != 0)
1826: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.48 markus 1827: }
1.320 djm 1828: r = 0;
1829: out:
1.250 djm 1830: free(rtype);
1.320 djm 1831: return r;
1.48 markus 1832: }
1.267 djm 1833:
1.269 djm 1834: struct hostkeys_update_ctx {
1835: /* The hostname and (optionally) IP address string for the server */
1836: char *host_str, *ip_str;
1837:
1838: /*
1839: * Keys received from the server and a flag for each indicating
1840: * whether they already exist in known_hosts.
1.351 djm 1841: * keys_match is filled in by hostkeys_find() and later (for new
1.381 djm 1842: * keys) by client_global_hostkeys_prove_confirm().
1.269 djm 1843: */
1844: struct sshkey **keys;
1.351 djm 1845: u_int *keys_match; /* mask of HKF_MATCH_* from hostfile.h */
1846: int *keys_verified; /* flag for new keys verified by server */
1847: size_t nkeys, nnew, nincomplete; /* total, new keys, incomplete match */
1.269 djm 1848:
1849: /*
1850: * Keys that are in known_hosts, but were not present in the update
1851: * from the server (i.e. scheduled to be deleted).
1852: * Filled in by hostkeys_find().
1853: */
1854: struct sshkey **old_keys;
1855: size_t nold;
1.347 djm 1856:
1857: /* Various special cases. */
1.350 djm 1858: int complex_hostspec; /* wildcard or manual pattern-list host name */
1.347 djm 1859: int ca_available; /* saw CA key for this host */
1.352 djm 1860: int old_key_seen; /* saw old key with other name/addr */
1.353 djm 1861: int other_name_seen; /* saw key with other name/addr */
1.269 djm 1862: };
1863:
1864: static void
1865: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1866: {
1867: size_t i;
1868:
1869: if (ctx == NULL)
1870: return;
1871: for (i = 0; i < ctx->nkeys; i++)
1872: sshkey_free(ctx->keys[i]);
1873: free(ctx->keys);
1.351 djm 1874: free(ctx->keys_match);
1875: free(ctx->keys_verified);
1.269 djm 1876: for (i = 0; i < ctx->nold; i++)
1877: sshkey_free(ctx->old_keys[i]);
1878: free(ctx->old_keys);
1879: free(ctx->host_str);
1880: free(ctx->ip_str);
1881: free(ctx);
1882: }
1883:
1.350 djm 1884: /*
1885: * Returns non-zero if a known_hosts hostname list is not of a form that
1886: * can be handled by UpdateHostkeys. These include wildcard hostnames and
1887: * hostnames lists that do not follow the form host[,ip].
1888: */
1889: static int
1890: hostspec_is_complex(const char *hosts)
1891: {
1892: char *cp;
1893:
1894: /* wildcard */
1895: if (strchr(hosts, '*') != NULL || strchr(hosts, '?') != NULL)
1896: return 1;
1897: /* single host/ip = ok */
1898: if ((cp = strchr(hosts, ',')) == NULL)
1899: return 0;
1900: /* more than two entries on the line */
1901: if (strchr(cp + 1, ',') != NULL)
1902: return 1;
1903: /* XXX maybe parse cp+1 and ensure it is an IP? */
1904: return 0;
1905: }
1906:
1.352 djm 1907: /* callback to search for ctx->keys in known_hosts */
1.269 djm 1908: static int
1909: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
1910: {
1911: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1912: size_t i;
1913: struct sshkey **tmp;
1914:
1.353 djm 1915: if (l->key == NULL)
1.269 djm 1916: return 0;
1.353 djm 1917: if (l->status != HKF_STATUS_MATCHED) {
1918: /* Record if one of the keys appears on a non-matching line */
1919: for (i = 0; i < ctx->nkeys; i++) {
1920: if (sshkey_equal(l->key, ctx->keys[i])) {
1921: ctx->other_name_seen = 1;
1.354 djm 1922: debug3_f("found %s key under different "
1923: "name/addr at %s:%ld",
1.353 djm 1924: sshkey_ssh_name(ctx->keys[i]),
1925: l->path, l->linenum);
1926: return 0;
1927: }
1928: }
1929: return 0;
1930: }
1931: /* Don't proceed if revocation or CA markers are present */
1932: /* XXX relax this */
1933: if (l->marker != MRK_NONE) {
1.354 djm 1934: debug3_f("hostkeys file %s:%ld has CA/revocation marker",
1935: l->path, l->linenum);
1.353 djm 1936: ctx->complex_hostspec = 1;
1937: return 0;
1938: }
1939:
1.355 djm 1940: /* If CheckHostIP is enabled, then check for mismatched hostname/addr */
1941: if (ctx->ip_str != NULL && strchr(l->hosts, ',') != NULL) {
1942: if ((l->match & HKF_MATCH_HOST) == 0) {
1943: /* Record if address matched a different hostname. */
1944: ctx->other_name_seen = 1;
1945: debug3_f("found address %s against different hostname "
1946: "at %s:%ld", ctx->ip_str, l->path, l->linenum);
1947: return 0;
1948: } else if ((l->match & HKF_MATCH_IP) == 0) {
1949: /* Record if hostname matched a different address. */
1950: ctx->other_name_seen = 1;
1951: debug3_f("found hostname %s against different address "
1952: "at %s:%ld", ctx->host_str, l->path, l->linenum);
1953: }
1.353 djm 1954: }
1.269 djm 1955:
1.350 djm 1956: /*
1957: * UpdateHostkeys is skipped for wildcard host names and hostnames
1958: * that contain more than two entries (ssh never writes these).
1959: */
1960: if (hostspec_is_complex(l->hosts)) {
1.354 djm 1961: debug3_f("hostkeys file %s:%ld complex host specification",
1962: l->path, l->linenum);
1.350 djm 1963: ctx->complex_hostspec = 1;
1.347 djm 1964: return 0;
1965: }
1966:
1.269 djm 1967: /* Mark off keys we've already seen for this host */
1968: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 1969: if (!sshkey_equal(l->key, ctx->keys[i]))
1970: continue;
1.354 djm 1971: debug3_f("found %s key at %s:%ld",
1.351 djm 1972: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
1973: ctx->keys_match[i] |= l->match;
1974: return 0;
1.269 djm 1975: }
1976: /* This line contained a key that not offered by the server */
1.354 djm 1977: debug3_f("deprecated %s key at %s:%ld", sshkey_ssh_name(l->key),
1978: l->path, l->linenum);
1.299 deraadt 1979: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 1980: sizeof(*ctx->old_keys))) == NULL)
1.354 djm 1981: fatal_f("recallocarray failed nold = %zu", ctx->nold);
1.269 djm 1982: ctx->old_keys = tmp;
1983: ctx->old_keys[ctx->nold++] = l->key;
1984: l->key = NULL;
1985:
1986: return 0;
1987: }
1988:
1.352 djm 1989: /* callback to search for ctx->old_keys in known_hosts under other names */
1990: static int
1991: hostkeys_check_old(struct hostkey_foreach_line *l, void *_ctx)
1992: {
1993: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1994: size_t i;
1995: int hashed;
1996:
1997: /* only care about lines that *don't* match the active host spec */
1998: if (l->status == HKF_STATUS_MATCHED || l->key == NULL)
1999: return 0;
2000:
2001: hashed = l->match & (HKF_MATCH_HOST_HASHED|HKF_MATCH_IP_HASHED);
2002: for (i = 0; i < ctx->nold; i++) {
2003: if (!sshkey_equal(l->key, ctx->old_keys[i]))
2004: continue;
1.354 djm 2005: debug3_f("found deprecated %s key at %s:%ld as %s",
1.364 djm 2006: sshkey_ssh_name(ctx->old_keys[i]), l->path, l->linenum,
1.352 djm 2007: hashed ? "[HASHED]" : l->hosts);
2008: ctx->old_key_seen = 1;
2009: break;
2010: }
2011: return 0;
2012: }
2013:
2014: /*
2015: * Check known_hosts files for deprecated keys under other names. Returns 0
2016: * on success or -1 on failure. Updates ctx->old_key_seen if deprecated keys
2017: * exist under names other than the active hostname/IP.
2018: */
2019: static int
2020: check_old_keys_othernames(struct hostkeys_update_ctx *ctx)
2021: {
2022: size_t i;
2023: int r;
2024:
1.354 djm 2025: debug2_f("checking for %zu deprecated keys", ctx->nold);
1.352 djm 2026: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 2027: debug3_f("searching %s for %s / %s",
1.352 djm 2028: options.user_hostfiles[i], ctx->host_str,
2029: ctx->ip_str ? ctx->ip_str : "(none)");
2030: if ((r = hostkeys_foreach(options.user_hostfiles[i],
2031: hostkeys_check_old, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 2032: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.352 djm 2033: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 2034: debug_f("hostkeys file %s does not exist",
2035: options.user_hostfiles[i]);
1.352 djm 2036: continue;
2037: }
1.354 djm 2038: error_fr(r, "hostkeys_foreach failed for %s",
2039: options.user_hostfiles[i]);
1.352 djm 2040: return -1;
2041: }
2042: }
2043: return 0;
2044: }
2045:
1.269 djm 2046: static void
1.337 djm 2047: hostkey_change_preamble(LogLevel loglevel)
1.269 djm 2048: {
1.336 djm 2049: do_log2(loglevel, "The server has updated its host keys.");
2050: do_log2(loglevel, "These changes were verified by the server's "
2051: "existing trusted key.");
2052: }
2053:
2054: static void
2055: update_known_hosts(struct hostkeys_update_ctx *ctx)
2056: {
2057: int r, was_raw = 0, first = 1;
2058: int asking = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK;
2059: LogLevel loglevel = asking ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1.269 djm 2060: char *fp, *response;
2061: size_t i;
1.333 djm 2062: struct stat sb;
1.269 djm 2063:
2064: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2065: if (!ctx->keys_verified[i])
1.269 djm 2066: continue;
2067: if ((fp = sshkey_fingerprint(ctx->keys[i],
2068: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2069: fatal_f("sshkey_fingerprint failed");
1.336 djm 2070: if (first && asking)
1.337 djm 2071: hostkey_change_preamble(loglevel);
1.269 djm 2072: do_log2(loglevel, "Learned new hostkey: %s %s",
2073: sshkey_type(ctx->keys[i]), fp);
1.336 djm 2074: first = 0;
1.269 djm 2075: free(fp);
2076: }
2077: for (i = 0; i < ctx->nold; i++) {
2078: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2079: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2080: fatal_f("sshkey_fingerprint failed");
1.336 djm 2081: if (first && asking)
1.337 djm 2082: hostkey_change_preamble(loglevel);
1.269 djm 2083: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2084: sshkey_type(ctx->old_keys[i]), fp);
1.336 djm 2085: first = 0;
1.269 djm 2086: free(fp);
2087: }
2088: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2089: if (get_saved_tio() != NULL) {
2090: leave_raw_mode(1);
2091: was_raw = 1;
2092: }
1.269 djm 2093: response = NULL;
2094: for (i = 0; !quit_pending && i < 3; i++) {
2095: free(response);
2096: response = read_passphrase("Accept updated hostkeys? "
2097: "(yes/no): ", RP_ECHO);
1.389 dtucker 2098: if (response != NULL && strcasecmp(response, "yes") == 0)
1.269 djm 2099: break;
2100: else if (quit_pending || response == NULL ||
2101: strcasecmp(response, "no") == 0) {
2102: options.update_hostkeys = 0;
2103: break;
2104: } else {
2105: do_log2(loglevel, "Please enter "
2106: "\"yes\" or \"no\"");
2107: }
2108: }
2109: if (quit_pending || i >= 3 || response == NULL)
2110: options.update_hostkeys = 0;
2111: free(response);
1.271 djm 2112: if (was_raw)
2113: enter_raw_mode(1);
1.269 djm 2114: }
1.333 djm 2115: if (options.update_hostkeys == 0)
2116: return;
1.269 djm 2117: /*
2118: * Now that all the keys are verified, we can go ahead and replace
2119: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2120: * cancel the operation).
2121: */
1.333 djm 2122: for (i = 0; i < options.num_user_hostfiles; i++) {
2123: /*
2124: * NB. keys are only added to hostfiles[0], for the rest we
2125: * just delete the hostname entries.
2126: */
2127: if (stat(options.user_hostfiles[i], &sb) != 0) {
2128: if (errno == ENOENT) {
1.354 djm 2129: debug_f("known hosts file %s does not "
2130: "exist", options.user_hostfiles[i]);
1.333 djm 2131: } else {
1.354 djm 2132: error_f("known hosts file %s "
2133: "inaccessible: %s",
2134: options.user_hostfiles[i], strerror(errno));
1.333 djm 2135: }
2136: continue;
2137: }
2138: if ((r = hostfile_replace_entries(options.user_hostfiles[i],
2139: ctx->host_str, ctx->ip_str,
2140: i == 0 ? ctx->keys : NULL, i == 0 ? ctx->nkeys : 0,
2141: options.hash_known_hosts, 0,
2142: options.fingerprint_hash)) != 0) {
1.354 djm 2143: error_fr(r, "hostfile_replace_entries failed for %s",
2144: options.user_hostfiles[i]);
1.333 djm 2145: }
2146: }
1.269 djm 2147: }
2148:
2149: static void
1.381 djm 2150: client_global_hostkeys_prove_confirm(struct ssh *ssh, int type,
1.303 djm 2151: u_int32_t seq, void *_ctx)
1.269 djm 2152: {
2153: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2154: size_t i, ndone;
2155: struct sshbuf *signdata;
1.375 djm 2156: int r, plaintype;
1.269 djm 2157: const u_char *sig;
1.375 djm 2158: const char *rsa_kexalg = NULL;
2159: char *alg = NULL;
1.269 djm 2160: size_t siglen;
2161:
2162: if (ctx->nnew == 0)
1.354 djm 2163: fatal_f("ctx->nnew == 0"); /* sanity */
1.269 djm 2164: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2165: error("Server failed to confirm ownership of "
2166: "private host keys");
2167: hostkeys_update_ctx_free(ctx);
2168: return;
2169: }
1.375 djm 2170: if (sshkey_type_plain(sshkey_type_from_name(
2171: ssh->kex->hostkey_alg)) == KEY_RSA)
2172: rsa_kexalg = ssh->kex->hostkey_alg;
1.269 djm 2173: if ((signdata = sshbuf_new()) == NULL)
1.354 djm 2174: fatal_f("sshbuf_new failed");
1.269 djm 2175: /*
2176: * Expect a signature for each of the ctx->nnew private keys we
2177: * haven't seen before. They will be in the same order as the
1.351 djm 2178: * ctx->keys where the corresponding ctx->keys_match[i] == 0.
1.269 djm 2179: */
2180: for (ndone = i = 0; i < ctx->nkeys; i++) {
1.351 djm 2181: if (ctx->keys_match[i])
1.269 djm 2182: continue;
1.375 djm 2183: plaintype = sshkey_type_plain(ctx->keys[i]->type);
1.269 djm 2184: /* Prepare data to be signed: session ID, unique string, key */
2185: sshbuf_reset(signdata);
1.270 djm 2186: if ( (r = sshbuf_put_cstring(signdata,
2187: "hostkeys-prove-00@openssh.com")) != 0 ||
1.358 djm 2188: (r = sshbuf_put_stringb(signdata,
2189: ssh->kex->session_id)) != 0 ||
1.269 djm 2190: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1.354 djm 2191: fatal_fr(r, "compose signdata");
1.269 djm 2192: /* Extract and verify signature */
2193: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1.354 djm 2194: error_fr(r, "parse sig");
1.269 djm 2195: goto out;
2196: }
1.375 djm 2197: if ((r = sshkey_get_sigtype(sig, siglen, &alg)) != 0) {
2198: error_fr(r, "server gave unintelligible signature "
2199: "for %s key %zu", sshkey_type(ctx->keys[i]), i);
2200: goto out;
2201: }
1.309 djm 2202: /*
1.375 djm 2203: * Special case for RSA keys: if a RSA hostkey was negotiated,
2204: * then use its signature type for verification of RSA hostkey
2205: * proofs. Otherwise, accept only RSA-SHA256/512 signatures.
1.309 djm 2206: */
1.375 djm 2207: if (plaintype == KEY_RSA && rsa_kexalg == NULL &&
2208: match_pattern_list(alg, HOSTKEY_PROOF_RSA_ALGS, 0) != 1) {
2209: debug_f("server used untrusted RSA signature algorithm "
2210: "%s for key %zu, disregarding", alg, i);
2211: free(alg);
2212: /* zap the key from the list */
2213: sshkey_free(ctx->keys[i]);
2214: ctx->keys[i] = NULL;
2215: ndone++;
2216: continue;
2217: }
2218: debug3_f("verify %s key %zu using sigalg %s",
2219: sshkey_type(ctx->keys[i]), i, alg);
2220: free(alg);
1.269 djm 2221: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1.308 djm 2222: sshbuf_ptr(signdata), sshbuf_len(signdata),
1.375 djm 2223: plaintype == KEY_RSA ? rsa_kexalg : NULL, 0, NULL)) != 0) {
1.361 djm 2224: error_fr(r, "server gave bad signature for %s key %zu",
1.354 djm 2225: sshkey_type(ctx->keys[i]), i);
1.269 djm 2226: goto out;
2227: }
2228: /* Key is good. Mark it as 'seen' */
1.351 djm 2229: ctx->keys_verified[i] = 1;
1.269 djm 2230: ndone++;
2231: }
1.354 djm 2232: /* Shouldn't happen */
1.269 djm 2233: if (ndone != ctx->nnew)
1.354 djm 2234: fatal_f("ndone != ctx->nnew (%zu / %zu)", ndone, ctx->nnew);
1.320 djm 2235: if ((r = sshpkt_get_end(ssh)) != 0) {
1.354 djm 2236: error_f("protocol error");
1.320 djm 2237: goto out;
2238: }
1.269 djm 2239:
2240: /* Make the edits to known_hosts */
2241: update_known_hosts(ctx);
2242: out:
2243: hostkeys_update_ctx_free(ctx);
1.384 djm 2244: hostkeys_update_complete = 1;
2245: client_repledge();
1.269 djm 2246: }
2247:
1.267 djm 2248: /*
1.291 djm 2249: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
2250: * Made slightly less trivial by the multiple RSA signature algorithm names.
2251: */
2252: static int
2253: key_accepted_by_hostkeyalgs(const struct sshkey *key)
2254: {
2255: const char *ktype = sshkey_ssh_name(key);
1.331 dtucker 2256: const char *hostkeyalgs = options.hostkeyalgorithms;
1.291 djm 2257:
2258: if (key == NULL || key->type == KEY_UNSPEC)
2259: return 0;
2260: if (key->type == KEY_RSA &&
2261: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
2262: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
2263: return 1;
2264: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
2265: }
2266:
2267: /*
1.270 djm 2268: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2269: * the server's hostkeys. The keys are checked against the user's
2270: * HostkeyAlgorithms preference before they are accepted.
2271: */
2272: static int
1.321 djm 2273: client_input_hostkeys(struct ssh *ssh)
1.267 djm 2274: {
2275: const u_char *blob = NULL;
1.269 djm 2276: size_t i, len = 0;
1.267 djm 2277: struct sshbuf *buf = NULL;
1.269 djm 2278: struct sshkey *key = NULL, **tmp;
1.384 djm 2279: int r, prove_sent = 0;
1.269 djm 2280: char *fp;
1.267 djm 2281: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2282: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2283: struct hostkeys_update_ctx *ctx = NULL;
1.351 djm 2284: u_int want;
1.267 djm 2285:
2286: if (hostkeys_seen)
1.354 djm 2287: fatal_f("server already sent hostkeys");
1.384 djm 2288: if (!can_update_hostkeys())
1.267 djm 2289: return 1;
1.384 djm 2290: hostkeys_seen = 1;
1.272 djm 2291:
2292: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2293: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2294: sshkey_free(key);
2295: key = NULL;
1.269 djm 2296: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
1.354 djm 2297: error_fr(r, "parse key");
1.269 djm 2298: goto out;
2299: }
1.270 djm 2300: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
1.354 djm 2301: do_log2_fr(r, r == SSH_ERR_KEY_TYPE_UNKNOWN ?
1.335 djm 2302: SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_ERROR,
1.354 djm 2303: "convert key");
1.335 djm 2304: continue;
1.270 djm 2305: }
1.267 djm 2306: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2307: SSH_FP_DEFAULT);
1.354 djm 2308: debug3_f("received %s key %s", sshkey_type(key), fp);
1.267 djm 2309: free(fp);
1.275 markus 2310:
1.291 djm 2311: if (!key_accepted_by_hostkeyalgs(key)) {
1.354 djm 2312: debug3_f("%s key not permitted by "
2313: "HostkeyAlgorithms", sshkey_ssh_name(key));
1.267 djm 2314: continue;
2315: }
1.269 djm 2316: /* Skip certs */
2317: if (sshkey_is_cert(key)) {
1.354 djm 2318: debug3_f("%s key is a certificate; skipping",
2319: sshkey_ssh_name(key));
1.269 djm 2320: continue;
2321: }
2322: /* Ensure keys are unique */
2323: for (i = 0; i < ctx->nkeys; i++) {
2324: if (sshkey_equal(key, ctx->keys[i])) {
1.354 djm 2325: error_f("received duplicated %s host key",
2326: sshkey_ssh_name(key));
1.269 djm 2327: goto out;
2328: }
2329: }
2330: /* Key is good, record it */
1.299 deraadt 2331: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2332: sizeof(*ctx->keys))) == NULL)
1.354 djm 2333: fatal_f("recallocarray failed nkeys = %zu",
2334: ctx->nkeys);
1.269 djm 2335: ctx->keys = tmp;
2336: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2337: key = NULL;
2338: }
2339:
1.269 djm 2340: if (ctx->nkeys == 0) {
1.354 djm 2341: debug_f("server sent no hostkeys");
1.267 djm 2342: goto out;
2343: }
1.270 djm 2344:
1.351 djm 2345: if ((ctx->keys_match = calloc(ctx->nkeys,
2346: sizeof(*ctx->keys_match))) == NULL ||
2347: (ctx->keys_verified = calloc(ctx->nkeys,
2348: sizeof(*ctx->keys_verified))) == NULL)
1.354 djm 2349: fatal_f("calloc failed");
1.267 djm 2350:
1.268 djm 2351: get_hostfile_hostname_ipaddr(host,
2352: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2353: options.port, &ctx->host_str,
2354: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2355:
1.269 djm 2356: /* Find which keys we already know about. */
1.333 djm 2357: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 2358: debug_f("searching %s for %s / %s",
1.339 dtucker 2359: options.user_hostfiles[i], ctx->host_str,
1.340 dtucker 2360: ctx->ip_str ? ctx->ip_str : "(none)");
1.333 djm 2361: if ((r = hostkeys_foreach(options.user_hostfiles[i],
2362: hostkeys_find, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 2363: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.333 djm 2364: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 2365: debug_f("hostkeys file %s does not exist",
2366: options.user_hostfiles[i]);
1.333 djm 2367: continue;
2368: }
1.354 djm 2369: error_fr(r, "hostkeys_foreach failed for %s",
2370: options.user_hostfiles[i]);
1.333 djm 2371: goto out;
2372: }
1.267 djm 2373: }
2374:
1.269 djm 2375: /* Figure out if we have any new keys to add */
1.351 djm 2376: ctx->nnew = ctx->nincomplete = 0;
2377: want = HKF_MATCH_HOST | ( options.check_host_ip ? HKF_MATCH_IP : 0);
1.269 djm 2378: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2379: if (ctx->keys_match[i] == 0)
1.269 djm 2380: ctx->nnew++;
1.351 djm 2381: if ((ctx->keys_match[i] & want) != want)
2382: ctx->nincomplete++;
1.269 djm 2383: }
2384:
1.354 djm 2385: debug3_f("%zu server keys: %zu new, %zu retained, "
2386: "%zu incomplete match. %zu to remove", ctx->nkeys, ctx->nnew,
2387: ctx->nkeys - ctx->nnew - ctx->nincomplete,
1.351 djm 2388: ctx->nincomplete, ctx->nold);
1.269 djm 2389:
1.353 djm 2390: if (ctx->nnew == 0 && ctx->nold == 0) {
1.354 djm 2391: debug_f("no new or deprecated keys from server");
1.353 djm 2392: goto out;
2393: }
2394:
2395: /* Various reasons why we cannot proceed with the update */
2396: if (ctx->complex_hostspec) {
1.354 djm 2397: debug_f("CA/revocation marker, manual host list or wildcard "
2398: "host pattern found, skipping UserKnownHostsFile update");
1.353 djm 2399: goto out;
2400: }
2401: if (ctx->other_name_seen) {
1.354 djm 2402: debug_f("host key found matching a different name/address, "
2403: "skipping UserKnownHostsFile update");
1.347 djm 2404: goto out;
1.352 djm 2405: }
2406: /*
2407: * If removing keys, check whether they appear under different
2408: * names/addresses and refuse to proceed if they do. This avoids
2409: * cases such as hosts with multiple names becoming inconsistent
2410: * with regards to CheckHostIP entries.
2411: * XXX UpdateHostkeys=force to override this (and other) checks?
2412: */
2413: if (ctx->nold != 0) {
2414: if (check_old_keys_othernames(ctx) != 0)
2415: goto out; /* error already logged */
2416: if (ctx->old_key_seen) {
1.354 djm 2417: debug_f("key(s) for %s%s%s exist under other names; "
2418: "skipping UserKnownHostsFile update",
1.352 djm 2419: ctx->host_str, ctx->ip_str == NULL ? "" : ",",
2420: ctx->ip_str == NULL ? "" : ctx->ip_str);
2421: goto out;
2422: }
2423: }
2424:
1.353 djm 2425: if (ctx->nnew == 0) {
1.351 djm 2426: /*
2427: * We have some keys to remove or fix matching for.
2428: * We can proceed to do this without requiring a fresh proof
2429: * from the server.
2430: */
1.269 djm 2431: update_known_hosts(ctx);
1.353 djm 2432: goto out;
2433: }
2434: /*
2435: * We have received previously-unseen keys from the server.
2436: * Ask the server to confirm ownership of the private halves.
2437: */
1.354 djm 2438: debug3_f("asking server to prove ownership for %zu keys", ctx->nnew);
1.353 djm 2439: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2440: (r = sshpkt_put_cstring(ssh,
2441: "hostkeys-prove-00@openssh.com")) != 0 ||
2442: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
1.354 djm 2443: fatal_fr(r, "prepare hostkeys-prove");
1.353 djm 2444: if ((buf = sshbuf_new()) == NULL)
1.354 djm 2445: fatal_f("sshbuf_new");
1.353 djm 2446: for (i = 0; i < ctx->nkeys; i++) {
2447: if (ctx->keys_match[i])
2448: continue;
2449: sshbuf_reset(buf);
2450: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0 ||
1.354 djm 2451: (r = sshpkt_put_stringb(ssh, buf)) != 0)
2452: fatal_fr(r, "assemble hostkeys-prove");
1.269 djm 2453: }
1.353 djm 2454: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2455: fatal_fr(r, "send hostkeys-prove");
1.353 djm 2456: client_register_global_confirm(
1.381 djm 2457: client_global_hostkeys_prove_confirm, ctx);
1.353 djm 2458: ctx = NULL; /* will be freed in callback */
1.384 djm 2459: prove_sent = 1;
1.269 djm 2460:
1.267 djm 2461: /* Success */
2462: out:
1.269 djm 2463: hostkeys_update_ctx_free(ctx);
1.267 djm 2464: sshkey_free(key);
2465: sshbuf_free(buf);
1.384 djm 2466: if (!prove_sent) {
2467: /* UpdateHostkeys handling completed */
2468: hostkeys_update_complete = 1;
2469: client_repledge();
2470: }
1.269 djm 2471: /*
2472: * NB. Return success for all cases. The server doesn't need to know
2473: * what the client does with its hosts file.
2474: */
2475: return 1;
1.267 djm 2476: }
2477:
1.264 markus 2478: static int
1.297 markus 2479: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2480: {
2481: char *rtype;
1.320 djm 2482: u_char want_reply;
2483: int r, success = 0;
1.95 markus 2484:
1.320 djm 2485: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
2486: (r = sshpkt_get_u8(ssh, &want_reply)) != 0)
2487: goto out;
1.117 markus 2488: debug("client_input_global_request: rtype %s want_reply %d",
2489: rtype, want_reply);
1.270 djm 2490: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.321 djm 2491: success = client_input_hostkeys(ssh);
1.95 markus 2492: if (want_reply) {
1.320 djm 2493: if ((r = sshpkt_start(ssh, success ? SSH2_MSG_REQUEST_SUCCESS :
2494: SSH2_MSG_REQUEST_FAILURE)) != 0 ||
2495: (r = sshpkt_send(ssh)) != 0 ||
2496: (r = ssh_packet_write_wait(ssh)) != 0)
2497: goto out;
1.95 markus 2498: }
1.320 djm 2499: r = 0;
2500: out:
1.250 djm 2501: free(rtype);
1.320 djm 2502: return r;
1.95 markus 2503: }
1.22 markus 2504:
1.354 djm 2505: static void
2506: client_send_env(struct ssh *ssh, int id, const char *name, const char *val)
2507: {
2508: int r;
2509:
2510: debug("channel %d: setting env %s = \"%s\"", id, name, val);
2511: channel_request_start(ssh, id, "env", 0);
2512: if ((r = sshpkt_put_cstring(ssh, name)) != 0 ||
2513: (r = sshpkt_put_cstring(ssh, val)) != 0 ||
2514: (r = sshpkt_send(ssh)) != 0)
2515: fatal_fr(r, "send setenv");
2516: }
2517:
1.123 djm 2518: void
1.303 djm 2519: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.315 markus 2520: const char *term, struct termios *tiop, int in_fd, struct sshbuf *cmd,
2521: char **env)
1.123 djm 2522: {
1.380 djm 2523: size_t i, j, len;
2524: int matched, r;
1.313 djm 2525: char *name, *val;
1.132 djm 2526: Channel *c = NULL;
1.123 djm 2527:
1.354 djm 2528: debug2_f("id %d", id);
1.123 djm 2529:
1.303 djm 2530: if ((c = channel_lookup(ssh, id)) == NULL)
1.354 djm 2531: fatal_f("channel %d: unknown channel", id);
1.224 djm 2532:
1.320 djm 2533: ssh_packet_set_interactive(ssh, want_tty,
1.224 djm 2534: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2535:
1.123 djm 2536: if (want_tty) {
2537: struct winsize ws;
2538:
2539: /* Store window size in the packet. */
1.326 deraadt 2540: if (ioctl(in_fd, TIOCGWINSZ, &ws) == -1)
1.123 djm 2541: memset(&ws, 0, sizeof(ws));
2542:
1.303 djm 2543: channel_request_start(ssh, id, "pty-req", 1);
2544: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.320 djm 2545: if ((r = sshpkt_put_cstring(ssh, term != NULL ? term : ""))
2546: != 0 ||
2547: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 ||
2548: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 ||
2549: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 ||
2550: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0)
1.354 djm 2551: fatal_fr(r, "build pty-req");
1.194 djm 2552: if (tiop == NULL)
2553: tiop = get_saved_tio();
1.316 markus 2554: ssh_tty_make_modes(ssh, -1, tiop);
1.320 djm 2555: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2556: fatal_fr(r, "send pty-req");
1.123 djm 2557: /* XXX wait for reply */
1.132 djm 2558: c->client_tty = 1;
1.123 djm 2559: }
2560:
2561: /* Transfer any environment variables from client to server */
1.126 djm 2562: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2563: debug("Sending environment.");
1.126 djm 2564: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2565: /* Split */
1.126 djm 2566: name = xstrdup(env[i]);
1.123 djm 2567: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2568: free(name);
1.123 djm 2569: continue;
2570: }
2571: *val++ = '\0';
2572:
2573: matched = 0;
2574: for (j = 0; j < options.num_send_env; j++) {
2575: if (match_pattern(name, options.send_env[j])) {
2576: matched = 1;
2577: break;
2578: }
2579: }
2580: if (!matched) {
2581: debug3("Ignored env %s", name);
1.250 djm 2582: free(name);
1.123 djm 2583: continue;
2584: }
1.354 djm 2585: client_send_env(ssh, id, name, val);
1.250 djm 2586: free(name);
1.123 djm 2587: }
1.313 djm 2588: }
2589: for (i = 0; i < options.num_setenv; i++) {
2590: /* Split */
2591: name = xstrdup(options.setenv[i]);
2592: if ((val = strchr(name, '=')) == NULL) {
2593: free(name);
2594: continue;
2595: }
2596: *val++ = '\0';
1.354 djm 2597: client_send_env(ssh, id, name, val);
1.313 djm 2598: free(name);
1.123 djm 2599: }
2600:
1.315 markus 2601: len = sshbuf_len(cmd);
1.123 djm 2602: if (len > 0) {
2603: if (len > 900)
2604: len = 900;
2605: if (want_subsystem) {
1.190 djm 2606: debug("Sending subsystem: %.*s",
1.380 djm 2607: (int)len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2608: channel_request_start(ssh, id, "subsystem", 1);
2609: client_expect_confirm(ssh, id, "subsystem",
2610: CONFIRM_CLOSE);
1.123 djm 2611: } else {
1.190 djm 2612: debug("Sending command: %.*s",
1.380 djm 2613: (int)len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2614: channel_request_start(ssh, id, "exec", 1);
2615: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2616: }
1.320 djm 2617: if ((r = sshpkt_put_stringb(ssh, cmd)) != 0 ||
2618: (r = sshpkt_send(ssh)) != 0)
1.354 djm 2619: fatal_fr(r, "send command");
1.123 djm 2620: } else {
1.303 djm 2621: channel_request_start(ssh, id, "shell", 1);
2622: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.354 djm 2623: if ((r = sshpkt_send(ssh)) != 0)
2624: fatal_fr(r, "send shell");
1.123 djm 2625: }
1.384 djm 2626:
2627: session_setup_complete = 1;
2628: client_repledge();
1.123 djm 2629: }
2630:
1.77 itojun 2631: static void
1.321 djm 2632: client_init_dispatch(struct ssh *ssh)
1.16 markus 2633: {
1.321 djm 2634: ssh_dispatch_init(ssh, &dispatch_protocol_error);
1.100 markus 2635:
1.321 djm 2636: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2637: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2638: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2639: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2640: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2641: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2642: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2643: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2644: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2645: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2646: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2647: ssh_dispatch_set(ssh, SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2648:
2649: /* rekeying */
1.321 djm 2650: ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2651:
2652: /* global request reply messages */
1.321 djm 2653: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2654: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2655: }
2656:
2657: void
2658: client_stop_mux(void)
2659: {
2660: if (options.control_path != NULL && muxserver_sock != -1)
2661: unlink(options.control_path);
2662: /*
1.247 dtucker 2663: * If we are in persist mode, or don't have a shell, signal that we
2664: * should close when all active channels are closed.
1.232 djm 2665: */
1.366 djm 2666: if (options.control_persist || options.session_type == SESSION_TYPE_NONE) {
1.232 djm 2667: session_closed = 1;
1.235 djm 2668: setproctitle("[stopped mux]");
2669: }
1.113 markus 2670: }
2671:
2672: /* client specific fatal cleanup */
2673: void
1.114 markus 2674: cleanup_exit(int i)
1.113 markus 2675: {
1.233 djm 2676: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.192 djm 2677: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2678: unlink(options.control_path);
1.223 djm 2679: ssh_kill_proxy_command();
1.114 markus 2680: _exit(i);
1.1 deraadt 2681: }
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