Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.392
1.392 ! dtucker 1: /* $OpenBSD: clientloop.c,v 1.391 2023/03/31 04:04:15 djm Exp $ */
1.1 deraadt 2: /*
1.12 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.33 deraadt 6: * The main loop for the interactive session (client side).
1.20 markus 7: *
1.33 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 36: *
37: *
1.33 deraadt 38: * SSH2 support added by Markus Friedl.
1.78 markus 39: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 40: *
1.33 deraadt 41: * Redistribution and use in source and binary forms, with or without
42: * modification, are permitted provided that the following conditions
43: * are met:
44: * 1. Redistributions of source code must retain the above copyright
45: * notice, this list of conditions and the following disclaimer.
46: * 2. Redistributions in binary form must reproduce the above copyright
47: * notice, this list of conditions and the following disclaimer in the
48: * documentation and/or other materials provided with the distribution.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 60: */
1.1 deraadt 61:
1.152 stevesk 62:
1.175 deraadt 63: #include <sys/types.h>
1.152 stevesk 64: #include <sys/ioctl.h>
1.154 stevesk 65: #include <sys/stat.h>
1.166 stevesk 66: #include <sys/socket.h>
1.171 stevesk 67: #include <sys/time.h>
1.189 djm 68: #include <sys/queue.h>
1.150 stevesk 69:
1.155 stevesk 70: #include <ctype.h>
1.168 stevesk 71: #include <errno.h>
1.151 stevesk 72: #include <paths.h>
1.374 djm 73: #include <poll.h>
1.153 stevesk 74: #include <signal.h>
1.174 stevesk 75: #include <stdio.h>
1.173 stevesk 76: #include <stdlib.h>
1.170 stevesk 77: #include <string.h>
1.328 deraadt 78: #include <stdarg.h>
1.150 stevesk 79: #include <termios.h>
1.175 deraadt 80: #include <pwd.h>
1.169 stevesk 81: #include <unistd.h>
1.266 deraadt 82: #include <limits.h>
1.1 deraadt 83:
1.175 deraadt 84: #include "xmalloc.h"
1.45 markus 85: #include "ssh.h"
86: #include "ssh2.h"
1.1 deraadt 87: #include "packet.h"
1.315 markus 88: #include "sshbuf.h"
1.15 markus 89: #include "compat.h"
1.74 markus 90: #include "channels.h"
1.15 markus 91: #include "dispatch.h"
1.317 markus 92: #include "sshkey.h"
1.175 deraadt 93: #include "cipher.h"
1.54 markus 94: #include "kex.h"
1.275 markus 95: #include "myproposal.h"
1.45 markus 96: #include "log.h"
1.261 millert 97: #include "misc.h"
1.45 markus 98: #include "readconf.h"
99: #include "clientloop.h"
1.147 djm 100: #include "sshconnect.h"
1.40 markus 101: #include "authfd.h"
1.45 markus 102: #include "atomicio.h"
1.118 deraadt 103: #include "sshpty.h"
1.123 djm 104: #include "match.h"
105: #include "msg.h"
1.262 djm 106: #include "ssherr.h"
1.267 djm 107: #include "hostfile.h"
1.319 djm 108:
1.375 djm 109: /* Permitted RSA signature algorithms for UpdateHostkeys proofs */
110: #define HOSTKEY_PROOF_RSA_ALGS "rsa-sha2-512,rsa-sha2-256"
111:
1.39 markus 112: /* import options */
113: extern Options options;
1.1 deraadt 114:
1.123 djm 115: /* Control socket */
1.217 djm 116: extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */
1.123 djm 117:
1.13 markus 118: /*
119: * Name of the host we are connecting to. This is the name given on the
1.324 jmc 120: * command line, or the Hostname specified for the user-supplied name in a
1.13 markus 121: * configuration file.
122: */
1.1 deraadt 123: extern char *host;
124:
1.13 markus 125: /*
1.330 djm 126: * If this field is not NULL, the ForwardAgent socket is this path and different
127: * instead of SSH_AUTH_SOCK.
128: */
129: extern char *forward_agent_sock_path;
130:
131: /*
1.13 markus 132: * Flag to indicate that we have received a window change signal which has
133: * not yet been processed. This will cause a message indicating the new
134: * window size to be sent to the server a little later. This is volatile
135: * because this is updated in a signal handler.
136: */
1.88 markus 137: static volatile sig_atomic_t received_window_change_signal = 0;
138: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 139:
1.222 djm 140: /* Time when backgrounded control master using ControlPersist should exit */
141: static time_t control_persist_exit_time = 0;
142:
1.1 deraadt 143: /* Common data for the client loop code. */
1.217 djm 144: volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
1.11 markus 145: static int last_was_cr; /* Last character was a newline. */
1.197 djm 146: static int exit_status; /* Used to store the command exit status. */
1.315 markus 147: static struct sshbuf *stderr_buffer; /* Used for final exit message. */
1.11 markus 148: static int connection_in; /* Connection to server (input). */
149: static int connection_out; /* Connection to server (output). */
1.56 markus 150: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.221 djm 151: static int session_closed; /* In SSH2: login session closed. */
1.388 dtucker 152: static time_t x11_refuse_time; /* If >0, refuse x11 opens after this time. */
1.345 dtucker 153: static time_t server_alive_time; /* Time to do server_alive_check */
1.384 djm 154: static int hostkeys_update_complete;
155: static int session_setup_complete;
1.1 deraadt 156:
1.321 djm 157: static void client_init_dispatch(struct ssh *ssh);
1.16 markus 158: int session_ident = -1;
159:
1.195 djm 160: /* Track escape per proto2 channel */
161: struct escape_filter_ctx {
162: int escape_pending;
163: int escape_char;
164: };
165:
166: /* Context for channel confirmation replies */
1.190 djm 167: struct channel_reply_ctx {
168: const char *request_type;
1.234 djm 169: int id;
170: enum confirm_action action;
1.190 djm 171: };
172:
1.196 djm 173: /* Global request success/failure callbacks */
1.303 djm 174: /* XXX move to struct ssh? */
1.196 djm 175: struct global_confirm {
176: TAILQ_ENTRY(global_confirm) entry;
177: global_confirm_cb *cb;
178: void *ctx;
179: int ref_count;
180: };
181: TAILQ_HEAD(global_confirms, global_confirm);
182: static struct global_confirms global_confirms =
183: TAILQ_HEAD_INITIALIZER(global_confirms);
184:
1.315 markus 185: void ssh_process_session2_setup(int, int, int, struct sshbuf *);
1.377 djm 186: static void quit_message(const char *fmt, ...)
187: __attribute__((__format__ (printf, 1, 2)));
188:
189: static void
190: quit_message(const char *fmt, ...)
191: {
192: char *msg;
193: va_list args;
194: int r;
195:
196: va_start(args, fmt);
197: xvasprintf(&msg, fmt, args);
198: va_end(args);
199:
200: if ((r = sshbuf_putf(stderr_buffer, "%s\r\n", msg)) != 0)
201: fatal_fr(r, "sshbuf_putf");
202: quit_pending = 1;
203: }
1.123 djm 204:
1.13 markus 205: /*
206: * Signal handler for the window change signal (SIGWINCH). This just sets a
207: * flag indicating that the window has changed.
208: */
1.77 itojun 209: static void
1.11 markus 210: window_change_handler(int sig)
1.1 deraadt 211: {
1.11 markus 212: received_window_change_signal = 1;
1.1 deraadt 213: }
214:
1.13 markus 215: /*
216: * Signal handler for signals that cause the program to terminate. These
217: * signals must be trapped to restore terminal modes.
218: */
1.77 itojun 219: static void
1.11 markus 220: signal_handler(int sig)
1.1 deraadt 221: {
1.75 markus 222: received_signal = sig;
223: quit_pending = 1;
1.1 deraadt 224: }
225:
1.13 markus 226: /*
1.222 djm 227: * Sets control_persist_exit_time to the absolute time when the
228: * backgrounded control master should exit due to expiry of the
229: * ControlPersist timeout. Sets it to 0 if we are not a backgrounded
230: * control master process, or if there is no ControlPersist timeout.
231: */
232: static void
1.303 djm 233: set_control_persist_exit_time(struct ssh *ssh)
1.222 djm 234: {
235: if (muxserver_sock == -1 || !options.control_persist
1.232 djm 236: || options.control_persist_timeout == 0) {
1.222 djm 237: /* not using a ControlPersist timeout */
238: control_persist_exit_time = 0;
1.303 djm 239: } else if (channel_still_open(ssh)) {
1.222 djm 240: /* some client connections are still open */
241: if (control_persist_exit_time > 0)
1.354 djm 242: debug2_f("cancel scheduled exit");
1.222 djm 243: control_persist_exit_time = 0;
244: } else if (control_persist_exit_time <= 0) {
245: /* a client connection has recently closed */
1.251 dtucker 246: control_persist_exit_time = monotime() +
1.222 djm 247: (time_t)options.control_persist_timeout;
1.354 djm 248: debug2_f("schedule exit in %d seconds",
1.222 djm 249: options.control_persist_timeout);
250: }
251: /* else we are already counting down to the timeout */
252: }
253:
1.238 dtucker 254: #define SSH_X11_VALID_DISPLAY_CHARS ":/.-_"
255: static int
256: client_x11_display_valid(const char *display)
257: {
258: size_t i, dlen;
259:
1.279 djm 260: if (display == NULL)
261: return 0;
262:
1.238 dtucker 263: dlen = strlen(display);
264: for (i = 0; i < dlen; i++) {
1.256 deraadt 265: if (!isalnum((u_char)display[i]) &&
1.238 dtucker 266: strchr(SSH_X11_VALID_DISPLAY_CHARS, display[i]) == NULL) {
267: debug("Invalid character '%c' in DISPLAY", display[i]);
268: return 0;
269: }
270: }
271: return 1;
272: }
273:
1.274 djm 274: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
275: #define X11_TIMEOUT_SLACK 60
1.279 djm 276: int
1.303 djm 277: client_x11_get_proto(struct ssh *ssh, const char *display,
278: const char *xauth_path, u_int trusted, u_int timeout,
279: char **_proto, char **_data)
1.138 djm 280: {
1.318 djm 281: char *cmd, line[512], xdisplay[512];
1.279 djm 282: char xauthfile[PATH_MAX], xauthdir[PATH_MAX];
1.138 djm 283: static char proto[512], data[512];
284: FILE *f;
1.288 tedu 285: int got_data = 0, generated = 0, do_unlink = 0, r;
1.138 djm 286: struct stat st;
1.274 djm 287: u_int now, x11_timeout_real;
1.138 djm 288:
289: *_proto = proto;
290: *_data = data;
1.279 djm 291: proto[0] = data[0] = xauthfile[0] = xauthdir[0] = '\0';
1.138 djm 292:
1.279 djm 293: if (!client_x11_display_valid(display)) {
1.283 millert 294: if (display != NULL)
295: logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",
296: display);
1.279 djm 297: return -1;
298: }
299: if (xauth_path != NULL && stat(xauth_path, &st) == -1) {
1.138 djm 300: debug("No xauth program.");
1.279 djm 301: xauth_path = NULL;
302: }
303:
304: if (xauth_path != NULL) {
1.138 djm 305: /*
306: * Handle FamilyLocal case where $DISPLAY does
307: * not match an authorization entry. For this we
308: * just try "xauth list unix:displaynum.screennum".
309: * XXX: "localhost" match to determine FamilyLocal
310: * is not perfect.
311: */
312: if (strncmp(display, "localhost:", 10) == 0) {
1.279 djm 313: if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
314: display + 10)) < 0 ||
315: (size_t)r >= sizeof(xdisplay)) {
1.354 djm 316: error_f("display name too long");
1.279 djm 317: return -1;
318: }
1.138 djm 319: display = xdisplay;
320: }
321: if (trusted == 0) {
1.274 djm 322: /*
1.279 djm 323: * Generate an untrusted X11 auth cookie.
324: *
1.274 djm 325: * The authentication cookie should briefly outlive
326: * ssh's willingness to forward X11 connections to
327: * avoid nasty fail-open behaviour in the X server.
328: */
1.279 djm 329: mktemp_proto(xauthdir, sizeof(xauthdir));
330: if (mkdtemp(xauthdir) == NULL) {
1.354 djm 331: error_f("mkdtemp: %s", strerror(errno));
1.279 djm 332: return -1;
333: }
334: do_unlink = 1;
335: if ((r = snprintf(xauthfile, sizeof(xauthfile),
336: "%s/xauthfile", xauthdir)) < 0 ||
337: (size_t)r >= sizeof(xauthfile)) {
1.354 djm 338: error_f("xauthfile path too long");
1.279 djm 339: rmdir(xauthdir);
340: return -1;
341: }
342:
1.318 djm 343: if (timeout == 0) {
344: /* auth doesn't time out */
345: xasprintf(&cmd, "%s -f %s generate %s %s "
346: "untrusted 2>%s",
347: xauth_path, xauthfile, display,
348: SSH_X11_PROTO, _PATH_DEVNULL);
349: } else {
350: /* Add some slack to requested expiry */
351: if (timeout < UINT_MAX - X11_TIMEOUT_SLACK)
352: x11_timeout_real = timeout +
353: X11_TIMEOUT_SLACK;
354: else {
355: /* Don't overflow on long timeouts */
356: x11_timeout_real = UINT_MAX;
357: }
358: xasprintf(&cmd, "%s -f %s generate %s %s "
359: "untrusted timeout %u 2>%s",
360: xauth_path, xauthfile, display,
361: SSH_X11_PROTO, x11_timeout_real,
362: _PATH_DEVNULL);
363: }
1.354 djm 364: debug2_f("xauth command: %s", cmd);
1.318 djm 365:
366: if (timeout != 0 && x11_refuse_time == 0) {
1.279 djm 367: now = monotime() + 1;
1.388 dtucker 368: if (SSH_TIME_T_MAX - timeout < now)
369: x11_refuse_time = SSH_TIME_T_MAX;
1.279 djm 370: else
371: x11_refuse_time = now + timeout;
1.303 djm 372: channel_set_x11_refuse_time(ssh,
373: x11_refuse_time);
1.138 djm 374: }
1.279 djm 375: if (system(cmd) == 0)
376: generated = 1;
1.318 djm 377: free(cmd);
1.138 djm 378: }
1.181 markus 379:
380: /*
381: * When in untrusted mode, we read the cookie only if it was
382: * successfully generated as an untrusted one in the step
383: * above.
384: */
385: if (trusted || generated) {
1.318 djm 386: xasprintf(&cmd,
1.181 markus 387: "%s %s%s list %s 2>" _PATH_DEVNULL,
388: xauth_path,
389: generated ? "-f " : "" ,
390: generated ? xauthfile : "",
391: display);
392: debug2("x11_get_proto: %s", cmd);
393: f = popen(cmd, "r");
394: if (f && fgets(line, sizeof(line), f) &&
395: sscanf(line, "%*s %511s %511s", proto, data) == 2)
396: got_data = 1;
397: if (f)
398: pclose(f);
1.318 djm 399: free(cmd);
1.279 djm 400: }
1.138 djm 401: }
402:
403: if (do_unlink) {
404: unlink(xauthfile);
405: rmdir(xauthdir);
406: }
407:
1.279 djm 408: /* Don't fall back to fake X11 data for untrusted forwarding */
409: if (!trusted && !got_data) {
410: error("Warning: untrusted X11 forwarding setup failed: "
411: "xauth key data not generated");
412: return -1;
413: }
414:
1.138 djm 415: /*
416: * If we didn't get authentication data, just make up some
417: * data. The forwarding code will check the validity of the
418: * response anyway, and substitute this data. The X11
419: * server, however, will ignore this fake data and use
420: * whatever authentication mechanisms it was using otherwise
421: * for the local connection.
422: */
423: if (!got_data) {
1.288 tedu 424: u_int8_t rnd[16];
425: u_int i;
1.138 djm 426:
427: logit("Warning: No xauth data; "
428: "using fake authentication data for X11 forwarding.");
429: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.288 tedu 430: arc4random_buf(rnd, sizeof(rnd));
431: for (i = 0; i < sizeof(rnd); i++) {
1.138 djm 432: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.288 tedu 433: rnd[i]);
1.138 djm 434: }
435: }
1.279 djm 436:
437: return 0;
1.1 deraadt 438: }
439:
1.13 markus 440: /*
441: * Checks if the client window has changed, and sends a packet about it to
442: * the server if so. The actual change is detected elsewhere (by a software
443: * interrupt on Unix); this just checks the flag and sends a message if
444: * appropriate.
445: */
1.1 deraadt 446:
1.77 itojun 447: static void
1.303 djm 448: client_check_window_change(struct ssh *ssh)
1.1 deraadt 449: {
1.292 djm 450: if (!received_window_change_signal)
1.16 markus 451: return;
452: received_window_change_signal = 0;
1.354 djm 453: debug2_f("changed");
1.303 djm 454: channel_send_window_changes(ssh);
1.1 deraadt 455: }
456:
1.264 markus 457: static int
1.297 markus 458: client_global_request_reply(int type, u_int32_t seq, struct ssh *ssh)
1.117 markus 459: {
1.196 djm 460: struct global_confirm *gc;
461:
462: if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
1.264 markus 463: return 0;
1.196 djm 464: if (gc->cb != NULL)
1.303 djm 465: gc->cb(ssh, type, seq, gc->ctx);
1.196 djm 466: if (--gc->ref_count <= 0) {
467: TAILQ_REMOVE(&global_confirms, gc, entry);
1.342 jsg 468: freezero(gc, sizeof(*gc));
1.196 djm 469: }
470:
1.320 djm 471: ssh_packet_set_alive_timeouts(ssh, 0);
1.264 markus 472: return 0;
1.117 markus 473: }
474:
475: static void
1.345 dtucker 476: schedule_server_alive_check(void)
477: {
478: if (options.server_alive_interval > 0)
479: server_alive_time = monotime() + options.server_alive_interval;
480: }
481:
482: static void
1.320 djm 483: server_alive_check(struct ssh *ssh)
1.117 markus 484: {
1.320 djm 485: int r;
486:
487: if (ssh_packet_inc_alive_timeouts(ssh) > options.server_alive_count_max) {
1.228 djm 488: logit("Timeout, server %s not responding.", host);
1.176 markus 489: cleanup_exit(255);
490: }
1.320 djm 491: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
492: (r = sshpkt_put_cstring(ssh, "keepalive@openssh.com")) != 0 ||
493: (r = sshpkt_put_u8(ssh, 1)) != 0 || /* boolean: want reply */
494: (r = sshpkt_send(ssh)) != 0)
1.354 djm 495: fatal_fr(r, "send packet");
1.196 djm 496: /* Insert an empty placeholder to maintain ordering */
497: client_register_global_confirm(NULL, NULL);
1.345 dtucker 498: schedule_server_alive_check();
1.117 markus 499: }
500:
1.13 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;
1.392 ! dtucker 999: struct escape_filter_ctx *efc;
1.31 markus 1000:
1.392 ! dtucker 1001: if (c == NULL || c->filter_ctx == NULL || len <= 0)
1.294 djm 1002: return 0;
1.314 djm 1003:
1.392 ! dtucker 1004: efc = (struct escape_filter_ctx *)c->filter_ctx;
1.139 djm 1005:
1006: for (i = 0; i < (u_int)len; i++) {
1.31 markus 1007: /* Get one character at a time. */
1008: ch = buf[i];
1009:
1.294 djm 1010: if (efc->escape_pending) {
1.31 markus 1011: /* We have previously seen an escape character. */
1012: /* Clear the flag now. */
1.294 djm 1013: efc->escape_pending = 0;
1.31 markus 1014:
1015: /* Process the escaped character. */
1016: switch (ch) {
1017: case '.':
1018: /* Terminate the connection. */
1.315 markus 1019: if ((r = sshbuf_putf(berr, "%c.\r\n",
1020: efc->escape_char)) != 0)
1.354 djm 1021: fatal_fr(r, "sshbuf_putf");
1.217 djm 1022: if (c && c->ctl_chan != -1) {
1.387 djm 1023: channel_force_close(ssh, c, 1);
1.195 djm 1024: return 0;
1025: } else
1026: quit_pending = 1;
1.31 markus 1027: return -1;
1028:
1029: case 'Z' - 64:
1.195 djm 1030: /* XXX support this for mux clients */
1.217 djm 1031: if (c && c->ctl_chan != -1) {
1.245 dtucker 1032: char b[16];
1.195 djm 1033: noescape:
1.245 dtucker 1034: if (ch == 'Z' - 64)
1035: snprintf(b, sizeof b, "^Z");
1036: else
1037: snprintf(b, sizeof b, "%c", ch);
1.315 markus 1038: if ((r = sshbuf_putf(berr,
1.245 dtucker 1039: "%c%s escape not available to "
1.195 djm 1040: "multiplexed sessions\r\n",
1.315 markus 1041: efc->escape_char, b)) != 0)
1.354 djm 1042: fatal_fr(r, "sshbuf_putf");
1.195 djm 1043: continue;
1044: }
1.197 djm 1045: /* Suspend the program. Inform the user */
1.315 markus 1046: if ((r = sshbuf_putf(berr,
1047: "%c^Z [suspend ssh]\r\n",
1048: efc->escape_char)) != 0)
1.354 djm 1049: fatal_fr(r, "sshbuf_putf");
1.31 markus 1050:
1051: /* Restore terminal modes and suspend. */
1052: client_suspend_self(bin, bout, berr);
1053:
1054: /* We have been continued. */
1055: continue;
1056:
1.111 markus 1057: case 'B':
1.315 markus 1058: if ((r = sshbuf_putf(berr,
1059: "%cB\r\n", efc->escape_char)) != 0)
1.354 djm 1060: fatal_fr(r, "sshbuf_putf");
1.303 djm 1061: channel_request_start(ssh, c->self, "break", 0);
1.315 markus 1062: if ((r = sshpkt_put_u32(ssh, 1000)) != 0 ||
1063: (r = sshpkt_send(ssh)) != 0)
1.354 djm 1064: fatal_fr(r, "send packet");
1.111 markus 1065: continue;
1066:
1.54 markus 1067: case 'R':
1.357 djm 1068: if (ssh->compat & SSH_BUG_NOREKEY)
1.292 djm 1069: logit("Server does not "
1070: "support re-keying");
1071: else
1072: need_rekeying = 1;
1.54 markus 1073: continue;
1074:
1.242 dtucker 1075: case 'V':
1076: /* FALLTHROUGH */
1077: case 'v':
1078: if (c && c->ctl_chan != -1)
1079: goto noescape;
1080: if (!log_is_on_stderr()) {
1.315 markus 1081: if ((r = sshbuf_putf(berr,
1.242 dtucker 1082: "%c%c [Logging to syslog]\r\n",
1.315 markus 1083: efc->escape_char, ch)) != 0)
1.354 djm 1084: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1085: continue;
1086: }
1087: if (ch == 'V' && options.log_level >
1088: SYSLOG_LEVEL_QUIET)
1089: log_change_level(--options.log_level);
1090: if (ch == 'v' && options.log_level <
1091: SYSLOG_LEVEL_DEBUG3)
1092: log_change_level(++options.log_level);
1.315 markus 1093: if ((r = sshbuf_putf(berr,
1.294 djm 1094: "%c%c [LogLevel %s]\r\n",
1095: efc->escape_char, ch,
1.315 markus 1096: log_level_name(options.log_level))) != 0)
1.354 djm 1097: fatal_fr(r, "sshbuf_putf");
1.242 dtucker 1098: continue;
1099:
1.31 markus 1100: case '&':
1.392 ! dtucker 1101: if (c->ctl_chan != -1)
1.195 djm 1102: goto noescape;
1.31 markus 1103: /*
1.197 djm 1104: * Detach the program (continue to serve
1105: * connections, but put in background and no
1106: * more new connections).
1.31 markus 1107: */
1108: /* Restore tty modes. */
1.233 djm 1109: leave_raw_mode(
1110: options.request_tty == REQUEST_TTY_FORCE);
1.31 markus 1111:
1112: /* Stop listening for new connections. */
1.303 djm 1113: channel_stop_listening(ssh);
1.31 markus 1114:
1.354 djm 1115: if ((r = sshbuf_putf(berr, "%c& "
1116: "[backgrounded]\n", efc->escape_char)) != 0)
1117: fatal_fr(r, "sshbuf_putf");
1.31 markus 1118:
1119: /* Fork into background. */
1120: pid = fork();
1.326 deraadt 1121: if (pid == -1) {
1.31 markus 1122: error("fork: %.100s", strerror(errno));
1123: continue;
1124: }
1125: if (pid != 0) { /* This is the parent. */
1126: /* The parent just exits. */
1127: exit(0);
1128: }
1129: /* The child continues serving connections. */
1.292 djm 1130: /* fake EOF on stdin */
1.315 markus 1131: if ((r = sshbuf_put_u8(bin, 4)) != 0)
1.354 djm 1132: fatal_fr(r, "sshbuf_put_u8");
1.292 djm 1133: return -1;
1.31 markus 1134: case '?':
1.294 djm 1135: print_escape_help(berr, efc->escape_char,
1.244 dtucker 1136: (c && c->ctl_chan != -1),
1137: log_is_on_stderr());
1.31 markus 1138: continue;
1139:
1140: case '#':
1.315 markus 1141: if ((r = sshbuf_putf(berr, "%c#\r\n",
1142: efc->escape_char)) != 0)
1.354 djm 1143: fatal_fr(r, "sshbuf_putf");
1.303 djm 1144: s = channel_open_message(ssh);
1.315 markus 1145: if ((r = sshbuf_put(berr, s, strlen(s))) != 0)
1.354 djm 1146: fatal_fr(r, "sshbuf_put");
1.250 djm 1147: free(s);
1.97 jakob 1148: continue;
1149:
1150: case 'C':
1.217 djm 1151: if (c && c->ctl_chan != -1)
1.206 djm 1152: goto noescape;
1.383 djm 1153: if (options.enable_escape_commandline == 0) {
1154: if ((r = sshbuf_putf(berr,
1155: "commandline disabled\r\n")) != 0)
1156: fatal_fr(r, "sshbuf_putf");
1157: continue;
1158: }
1.303 djm 1159: process_cmdline(ssh);
1.31 markus 1160: continue;
1161:
1162: default:
1.294 djm 1163: if (ch != efc->escape_char) {
1.315 markus 1164: if ((r = sshbuf_put_u8(bin,
1165: efc->escape_char)) != 0)
1.354 djm 1166: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1167: bytes++;
1168: }
1169: /* Escaped characters fall through here */
1170: break;
1171: }
1172: } else {
1173: /*
1.197 djm 1174: * The previous character was not an escape char.
1175: * Check if this is an escape.
1.31 markus 1176: */
1.294 djm 1177: if (last_was_cr && ch == efc->escape_char) {
1.197 djm 1178: /*
1179: * It is. Set the flag and continue to
1180: * next character.
1181: */
1.294 djm 1182: efc->escape_pending = 1;
1.31 markus 1183: continue;
1184: }
1185: }
1186:
1187: /*
1188: * Normal character. Record whether it was a newline,
1189: * and append it to the buffer.
1190: */
1191: last_was_cr = (ch == '\r' || ch == '\n');
1.315 markus 1192: if ((r = sshbuf_put_u8(bin, ch)) != 0)
1.354 djm 1193: fatal_fr(r, "sshbuf_put_u8");
1.31 markus 1194: bytes++;
1195: }
1196: return bytes;
1197: }
1198:
1.13 markus 1199: /*
1.15 markus 1200: * Get packets from the connection input buffer, and process them as long as
1201: * there are packets available.
1202: *
1203: * Any unknown packets received during the actual
1204: * session cause the session to terminate. This is
1205: * intended to make debugging easier since no
1206: * confirmations are sent. Any compatible protocol
1207: * extensions must be negotiated during the
1208: * preparatory phase.
1209: */
1210:
1.77 itojun 1211: static void
1.321 djm 1212: client_process_buffered_input_packets(struct ssh *ssh)
1.15 markus 1213: {
1.321 djm 1214: ssh_dispatch_run_fatal(ssh, DISPATCH_NONBLOCK, &quit_pending);
1.15 markus 1215: }
1216:
1.31 markus 1217: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1218:
1.195 djm 1219: /* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1220: void *
1221: client_new_escape_filter_ctx(int escape_char)
1222: {
1223: struct escape_filter_ctx *ret;
1224:
1.255 djm 1225: ret = xcalloc(1, sizeof(*ret));
1.195 djm 1226: ret->escape_pending = 0;
1227: ret->escape_char = escape_char;
1228: return (void *)ret;
1229: }
1230:
1.198 djm 1231: /* Free the escape filter context on channel free */
1232: void
1.303 djm 1233: client_filter_cleanup(struct ssh *ssh, int cid, void *ctx)
1.198 djm 1234: {
1.250 djm 1235: free(ctx);
1.198 djm 1236: }
1237:
1.195 djm 1238: int
1.303 djm 1239: client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len)
1.30 markus 1240: {
1.190 djm 1241: if (c->extended_usage != CHAN_EXTENDED_WRITE)
1242: return 0;
1243:
1.303 djm 1244: return process_escapes(ssh, c, c->input, c->output, c->extended,
1.195 djm 1245: buf, len);
1.30 markus 1246: }
1247:
1.77 itojun 1248: static void
1.387 djm 1249: client_channel_closed(struct ssh *ssh, int id, int force, void *arg)
1.60 markus 1250: {
1.303 djm 1251: channel_cancel_cleanup(ssh, id);
1.60 markus 1252: session_closed = 1;
1.233 djm 1253: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.60 markus 1254: }
1255:
1.15 markus 1256: /*
1.13 markus 1257: * Implements the interactive session with the server. This is called after
1258: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1259: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1260: * used as an escape character for terminating or suspending the session.
1.13 markus 1261: */
1.20 markus 1262: int
1.303 djm 1263: client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
1264: int ssh2_chan_id)
1.1 deraadt 1265: {
1.374 djm 1266: struct pollfd *pfd = NULL;
1267: u_int npfd_alloc = 0, npfd_active = 0;
1.11 markus 1268: double start_time, total_time;
1.374 djm 1269: int r, len;
1.200 markus 1270: u_int64_t ibytes, obytes;
1.374 djm 1271: int conn_in_ready, conn_out_ready;
1.11 markus 1272:
1273: debug("Entering interactive session.");
1.384 djm 1274: session_ident = ssh2_chan_id;
1.277 semarie 1275:
1.278 semarie 1276: if (options.control_master &&
1.286 djm 1277: !option_clear_or_none(options.control_path)) {
1.278 semarie 1278: debug("pledge: id");
1.327 mestre 1279: if (pledge("stdio rpath wpath cpath unix inet dns recvfd sendfd proc exec id tty",
1.278 semarie 1280: NULL) == -1)
1.354 djm 1281: fatal_f("pledge(): %s", strerror(errno));
1.278 semarie 1282:
1283: } else if (options.forward_x11 || options.permit_local_command) {
1.277 semarie 1284: debug("pledge: exec");
1285: if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty",
1286: NULL) == -1)
1.354 djm 1287: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1288:
1289: } else if (options.update_hostkeys) {
1.373 jsg 1290: debug("pledge: filesystem");
1.277 semarie 1291: if (pledge("stdio rpath wpath cpath unix inet dns proc tty",
1292: NULL) == -1)
1.354 djm 1293: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1294:
1.286 djm 1295: } else if (!option_clear_or_none(options.proxy_command) ||
1.369 djm 1296: options.fork_after_authentication) {
1.277 semarie 1297: debug("pledge: proc");
1298: if (pledge("stdio cpath unix inet dns proc tty", NULL) == -1)
1.354 djm 1299: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1300:
1301: } else {
1302: debug("pledge: network");
1.300 mestre 1303: if (pledge("stdio unix inet dns proc tty", NULL) == -1)
1.354 djm 1304: fatal_f("pledge(): %s", strerror(errno));
1.277 semarie 1305: }
1.11 markus 1306:
1.384 djm 1307: /* might be able to tighten now */
1308: client_repledge();
1309:
1.307 dtucker 1310: start_time = monotime_double();
1.11 markus 1311:
1312: /* Initialize variables. */
1313: last_was_cr = 1;
1314: exit_status = -1;
1.320 djm 1315: connection_in = ssh_packet_get_connection_in(ssh);
1316: connection_out = ssh_packet_get_connection_out(ssh);
1.46 markus 1317:
1.11 markus 1318: quit_pending = 0;
1319:
1.315 markus 1320: /* Initialize buffer. */
1321: if ((stderr_buffer = sshbuf_new()) == NULL)
1.354 djm 1322: fatal_f("sshbuf_new failed");
1.11 markus 1323:
1.321 djm 1324: client_init_dispatch(ssh);
1.15 markus 1325:
1.105 markus 1326: /*
1327: * Set signal handlers, (e.g. to restore non-blocking mode)
1328: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1329: */
1.332 dtucker 1330: if (ssh_signal(SIGHUP, SIG_IGN) != SIG_IGN)
1331: ssh_signal(SIGHUP, signal_handler);
1332: if (ssh_signal(SIGINT, SIG_IGN) != SIG_IGN)
1333: ssh_signal(SIGINT, signal_handler);
1334: if (ssh_signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1335: ssh_signal(SIGQUIT, signal_handler);
1336: if (ssh_signal(SIGTERM, SIG_IGN) != SIG_IGN)
1337: ssh_signal(SIGTERM, signal_handler);
1338: ssh_signal(SIGWINCH, window_change_handler);
1.11 markus 1339:
1340: if (have_pty)
1.233 djm 1341: enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.11 markus 1342:
1.292 djm 1343: if (session_ident != -1) {
1344: if (escape_char_arg != SSH_ESCAPECHAR_NONE) {
1.303 djm 1345: channel_register_filter(ssh, session_ident,
1.292 djm 1346: client_simple_escape_filter, NULL,
1347: client_filter_cleanup,
1348: client_new_escape_filter_ctx(
1349: escape_char_arg));
1.232 djm 1350: }
1.303 djm 1351: channel_register_cleanup(ssh, session_ident,
1.292 djm 1352: client_channel_closed, 0);
1.48 markus 1353: }
1.345 dtucker 1354:
1355: schedule_server_alive_check();
1.30 markus 1356:
1.11 markus 1357: /* Main loop of the client for the interactive session mode. */
1358: while (!quit_pending) {
1359:
1.13 markus 1360: /* Process buffered packets sent by the server. */
1.321 djm 1361: client_process_buffered_input_packets(ssh);
1.11 markus 1362:
1.303 djm 1363: if (session_closed && !channel_still_open(ssh))
1.60 markus 1364: break;
1365:
1.303 djm 1366: if (ssh_packet_is_rekeying(ssh)) {
1.56 markus 1367: debug("rekeying in progress");
1.284 djm 1368: } else if (need_rekeying) {
1369: /* manual rekey request */
1370: debug("need rekeying");
1.303 djm 1371: if ((r = kex_start_rekex(ssh)) != 0)
1.354 djm 1372: fatal_fr(r, "kex_start_rekex");
1.284 djm 1373: need_rekeying = 0;
1.56 markus 1374: } else {
1375: /*
1376: * Make packets from buffered channel data, and
1377: * enqueue them for sending to the server.
1378: */
1.320 djm 1379: if (ssh_packet_not_very_much_data_to_write(ssh))
1.303 djm 1380: channel_output_poll(ssh);
1.11 markus 1381:
1.56 markus 1382: /*
1383: * Check if the window size has changed, and buffer a
1384: * message about it to the server if so.
1385: */
1.303 djm 1386: client_check_window_change(ssh);
1.11 markus 1387:
1.56 markus 1388: if (quit_pending)
1389: break;
1390: }
1.13 markus 1391: /*
1392: * Wait until we have something to do (something becomes
1393: * available on one of the descriptors).
1394: */
1.374 djm 1395: client_wait_until_can_do_something(ssh, &pfd, &npfd_alloc,
1396: &npfd_active, ssh_packet_is_rekeying(ssh),
1397: &conn_in_ready, &conn_out_ready);
1.11 markus 1398:
1399: if (quit_pending)
1400: break;
1401:
1.379 djm 1402: /* Do channel operations. */
1403: channel_after_poll(ssh, pfd, npfd_active);
1.11 markus 1404:
1.17 markus 1405: /* Buffer input from the connection. */
1.374 djm 1406: if (conn_in_ready)
1407: client_process_net_input(ssh);
1.17 markus 1408:
1409: if (quit_pending)
1410: break;
1.367 djm 1411:
1412: /* A timeout may have triggered rekeying */
1413: if ((r = ssh_packet_check_rekey(ssh)) != 0)
1414: fatal_fr(r, "cannot start rekeying");
1.11 markus 1415:
1.197 djm 1416: /*
1417: * Send as much buffered packet data as possible to the
1418: * sender.
1419: */
1.374 djm 1420: if (conn_out_ready) {
1.338 djm 1421: if ((r = ssh_packet_write_poll(ssh)) != 0) {
1422: sshpkt_fatal(ssh, r,
1423: "%s: ssh_packet_write_poll", __func__);
1424: }
1425: }
1.222 djm 1426:
1427: /*
1428: * If we are a backgrounded control master, and the
1429: * timeout has expired without any active client
1430: * connections, then quit.
1431: */
1432: if (control_persist_exit_time > 0) {
1.251 dtucker 1433: if (monotime() >= control_persist_exit_time) {
1.222 djm 1434: debug("ControlPersist timeout expired");
1435: break;
1436: }
1437: }
1.11 markus 1438: }
1.374 djm 1439: free(pfd);
1.11 markus 1440:
1441: /* Terminate the session. */
1442:
1443: /* Stop watching for window change. */
1.332 dtucker 1444: ssh_signal(SIGWINCH, SIG_DFL);
1.211 andreas 1445:
1.320 djm 1446: if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
1447: (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_BY_APPLICATION)) != 0 ||
1448: (r = sshpkt_put_cstring(ssh, "disconnected by user")) != 0 ||
1449: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* language tag */
1450: (r = sshpkt_send(ssh)) != 0 ||
1451: (r = ssh_packet_write_wait(ssh)) != 0)
1.354 djm 1452: fatal_fr(r, "send disconnect");
1.11 markus 1453:
1.303 djm 1454: channel_free_all(ssh);
1.11 markus 1455:
1.75 markus 1456: if (have_pty)
1.233 djm 1457: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.116 dtucker 1458:
1459: /*
1460: * If there was no shell or command requested, there will be no remote
1461: * exit status to be returned. In that case, clear error code if the
1462: * connection was deliberately terminated at this end.
1463: */
1.370 djm 1464: if (options.session_type == SESSION_TYPE_NONE &&
1465: received_signal == SIGTERM) {
1.116 dtucker 1466: received_signal = 0;
1467: exit_status = 0;
1468: }
1.75 markus 1469:
1.301 dtucker 1470: if (received_signal) {
1471: verbose("Killed by signal %d.", (int) received_signal);
1.359 djm 1472: cleanup_exit(255);
1.301 dtucker 1473: }
1.75 markus 1474:
1.13 markus 1475: /*
1476: * In interactive mode (with pseudo tty) display a message indicating
1477: * that the connection has been closed.
1478: */
1.377 djm 1479: if (have_pty && options.log_level >= SYSLOG_LEVEL_INFO)
1480: quit_message("Connection to %s closed.", host);
1.70 markus 1481:
1.11 markus 1482: /* Output any buffered data for stderr. */
1.315 markus 1483: if (sshbuf_len(stderr_buffer) > 0) {
1.230 djm 1484: len = atomicio(vwrite, fileno(stderr),
1.315 markus 1485: (u_char *)sshbuf_ptr(stderr_buffer),
1486: sshbuf_len(stderr_buffer));
1487: if (len < 0 || (u_int)len != sshbuf_len(stderr_buffer))
1.11 markus 1488: error("Write failed flushing stderr buffer.");
1.315 markus 1489: else if ((r = sshbuf_consume(stderr_buffer, len)) != 0)
1.354 djm 1490: fatal_fr(r, "sshbuf_consume");
1.11 markus 1491: }
1492:
1493: /* Clear and free any buffers. */
1.315 markus 1494: sshbuf_free(stderr_buffer);
1.11 markus 1495:
1496: /* Report bytes transferred, and transfer rates. */
1.307 dtucker 1497: total_time = monotime_double() - start_time;
1.320 djm 1498: ssh_packet_get_bytes(ssh, &ibytes, &obytes);
1.200 markus 1499: verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1.229 djm 1500: (unsigned long long)obytes, (unsigned long long)ibytes, total_time);
1.11 markus 1501: if (total_time > 0)
1.200 markus 1502: verbose("Bytes per second: sent %.1f, received %.1f",
1503: obytes / total_time, ibytes / total_time);
1.11 markus 1504: /* Return the exit status of the program. */
1505: debug("Exit status %d", exit_status);
1506: return exit_status;
1.15 markus 1507: }
1508:
1509: /*********/
1510:
1.77 itojun 1511: static Channel *
1.303 djm 1512: client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type,
1513: int rchan, u_int rwindow, u_int rmaxpack)
1.40 markus 1514: {
1.103 deraadt 1515: Channel *c = NULL;
1.289 markus 1516: struct sshbuf *b = NULL;
1.40 markus 1517: char *listen_address, *originator_address;
1.320 djm 1518: u_int listen_port, originator_port;
1.289 markus 1519: int r;
1.40 markus 1520:
1521: /* Get rest of the packet */
1.320 djm 1522: if ((r = sshpkt_get_cstring(ssh, &listen_address, NULL)) != 0 ||
1523: (r = sshpkt_get_u32(ssh, &listen_port)) != 0 ||
1524: (r = sshpkt_get_cstring(ssh, &originator_address, NULL)) != 0 ||
1525: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1526: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1527: fatal_fr(r, "parse packet");
1.40 markus 1528:
1.354 djm 1529: debug_f("listen %s port %d, originator %s port %d",
1.261 millert 1530: listen_address, listen_port, originator_address, originator_port);
1.191 djm 1531:
1.320 djm 1532: if (listen_port > 0xffff)
1.354 djm 1533: error_f("invalid listen port");
1.320 djm 1534: else if (originator_port > 0xffff)
1.354 djm 1535: error_f("invalid originator port");
1.320 djm 1536: else {
1537: c = channel_connect_by_listen_address(ssh,
1538: listen_address, listen_port, "forwarded-tcpip",
1539: originator_address);
1540: }
1.40 markus 1541:
1.289 markus 1542: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1543: if ((b = sshbuf_new()) == NULL) {
1.354 djm 1544: error_f("alloc reply");
1.289 markus 1545: goto out;
1546: }
1547: /* reconstruct and send to muxclient */
1548: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
1549: (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1550: (r = sshbuf_put_cstring(b, request_type)) != 0 ||
1551: (r = sshbuf_put_u32(b, rchan)) != 0 ||
1552: (r = sshbuf_put_u32(b, rwindow)) != 0 ||
1553: (r = sshbuf_put_u32(b, rmaxpack)) != 0 ||
1554: (r = sshbuf_put_cstring(b, listen_address)) != 0 ||
1555: (r = sshbuf_put_u32(b, listen_port)) != 0 ||
1556: (r = sshbuf_put_cstring(b, originator_address)) != 0 ||
1557: (r = sshbuf_put_u32(b, originator_port)) != 0 ||
1.303 djm 1558: (r = sshbuf_put_stringb(c->output, b)) != 0) {
1.354 djm 1559: error_fr(r, "compose for muxclient");
1.289 markus 1560: goto out;
1561: }
1562: }
1563:
1564: out:
1565: sshbuf_free(b);
1.250 djm 1566: free(originator_address);
1567: free(listen_address);
1.40 markus 1568: return c;
1569: }
1570:
1.103 deraadt 1571: static Channel *
1.303 djm 1572: client_request_forwarded_streamlocal(struct ssh *ssh,
1573: const char *request_type, int rchan)
1.261 millert 1574: {
1575: Channel *c = NULL;
1576: char *listen_path;
1.320 djm 1577: int r;
1.261 millert 1578:
1579: /* Get the remote path. */
1.320 djm 1580: if ((r = sshpkt_get_cstring(ssh, &listen_path, NULL)) != 0 ||
1581: (r = sshpkt_get_string(ssh, NULL, NULL)) != 0 || /* reserved */
1582: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1583: fatal_fr(r, "parse packet");
1.261 millert 1584:
1.354 djm 1585: debug_f("request: %s", listen_path);
1.261 millert 1586:
1.303 djm 1587: c = channel_connect_by_listen_path(ssh, listen_path,
1.261 millert 1588: "forwarded-streamlocal@openssh.com", "forwarded-streamlocal");
1589: free(listen_path);
1590: return c;
1591: }
1592:
1593: static Channel *
1.303 djm 1594: client_request_x11(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1595: {
1596: Channel *c = NULL;
1597: char *originator;
1.321 djm 1598: u_int originator_port;
1.320 djm 1599: int r, sock;
1.40 markus 1600:
1601: if (!options.forward_x11) {
1602: error("Warning: ssh server tried X11 forwarding.");
1.197 djm 1603: error("Warning: this is probably a break-in attempt by a "
1604: "malicious server.");
1.221 djm 1605: return NULL;
1606: }
1.388 dtucker 1607: if (x11_refuse_time != 0 && monotime() >= x11_refuse_time) {
1.221 djm 1608: verbose("Rejected X11 connection after ForwardX11Timeout "
1609: "expired");
1.40 markus 1610: return NULL;
1611: }
1.320 djm 1612: if ((r = sshpkt_get_cstring(ssh, &originator, NULL)) != 0 ||
1.321 djm 1613: (r = sshpkt_get_u32(ssh, &originator_port)) != 0 ||
1.320 djm 1614: (r = sshpkt_get_end(ssh)) != 0)
1.354 djm 1615: fatal_fr(r, "parse packet");
1.40 markus 1616: /* XXX check permission */
1.321 djm 1617: /* XXX range check originator port? */
1618: debug("client_request_x11: request from %s %u", originator,
1.47 markus 1619: originator_port);
1.250 djm 1620: free(originator);
1.303 djm 1621: sock = x11_connect_display(ssh);
1.67 markus 1622: if (sock < 0)
1623: return NULL;
1.303 djm 1624: c = channel_new(ssh, "x11",
1.67 markus 1625: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1626: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1627: c->force_drain = 1;
1.40 markus 1628: return c;
1629: }
1630:
1.103 deraadt 1631: static Channel *
1.303 djm 1632: client_request_agent(struct ssh *ssh, const char *request_type, int rchan)
1.40 markus 1633: {
1634: Channel *c = NULL;
1.262 djm 1635: int r, sock;
1.40 markus 1636:
1637: if (!options.forward_agent) {
1638: error("Warning: ssh server tried agent forwarding.");
1.197 djm 1639: error("Warning: this is probably a break-in attempt by a "
1640: "malicious server.");
1.40 markus 1641: return NULL;
1642: }
1.330 djm 1643: if (forward_agent_sock_path == NULL) {
1644: r = ssh_get_authentication_socket(&sock);
1645: } else {
1646: r = ssh_get_authentication_socket_path(forward_agent_sock_path, &sock);
1647: }
1648: if (r != 0) {
1.262 djm 1649: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1.354 djm 1650: debug_fr(r, "ssh_get_authentication_socket");
1.67 markus 1651: return NULL;
1.262 djm 1652: }
1.372 djm 1653: if ((r = ssh_agent_bind_hostkey(sock, ssh->kex->initial_hostkey,
1654: ssh->kex->session_id, ssh->kex->initial_sig, 1)) == 0)
1655: debug_f("bound agent to hostkey");
1656: else
1657: debug2_fr(r, "ssh_agent_bind_hostkey");
1658:
1.303 djm 1659: c = channel_new(ssh, "authentication agent connection",
1.67 markus 1660: SSH_CHANNEL_OPEN, sock, sock, -1,
1.185 dtucker 1661: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
1.110 markus 1662: "authentication agent connection", 1);
1.82 markus 1663: c->force_drain = 1;
1.40 markus 1664: return c;
1.180 djm 1665: }
1666:
1.306 djm 1667: char *
1.303 djm 1668: client_request_tun_fwd(struct ssh *ssh, int tun_mode,
1.343 djm 1669: int local_tun, int remote_tun, channel_open_fn *cb, void *cbctx)
1.180 djm 1670: {
1671: Channel *c;
1.320 djm 1672: int r, fd;
1.306 djm 1673: char *ifname = NULL;
1.180 djm 1674:
1675: if (tun_mode == SSH_TUNMODE_NO)
1676: return 0;
1677:
1678: debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1679:
1680: /* Open local tunnel device */
1.306 djm 1681: if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) {
1.180 djm 1682: error("Tunnel device open failed.");
1.306 djm 1683: return NULL;
1.180 djm 1684: }
1.306 djm 1685: debug("Tunnel forwarding using interface %s", ifname);
1.180 djm 1686:
1.303 djm 1687: c = channel_new(ssh, "tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1.180 djm 1688: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1689: c->datagram = 1;
1.343 djm 1690:
1691: if (cb != NULL)
1692: channel_register_open_confirm(ssh, c->self, cb, cbctx);
1.180 djm 1693:
1.320 djm 1694: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1695: (r = sshpkt_put_cstring(ssh, "tun@openssh.com")) != 0 ||
1696: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1697: (r = sshpkt_put_u32(ssh, c->local_window_max)) != 0 ||
1698: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1699: (r = sshpkt_put_u32(ssh, tun_mode)) != 0 ||
1700: (r = sshpkt_put_u32(ssh, remote_tun)) != 0 ||
1701: (r = sshpkt_send(ssh)) != 0)
1.321 djm 1702: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.180 djm 1703:
1.306 djm 1704: return ifname;
1.40 markus 1705: }
1706:
1.22 markus 1707: /* XXXX move to generic input handler */
1.264 markus 1708: static int
1.297 markus 1709: client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
1.22 markus 1710: {
1711: Channel *c = NULL;
1.320 djm 1712: char *ctype = NULL;
1713: int r;
1714: u_int rchan;
1715: size_t len;
1716: u_int rmaxpack, rwindow;
1717:
1718: if ((r = sshpkt_get_cstring(ssh, &ctype, &len)) != 0 ||
1719: (r = sshpkt_get_u32(ssh, &rchan)) != 0 ||
1720: (r = sshpkt_get_u32(ssh, &rwindow)) != 0 ||
1721: (r = sshpkt_get_u32(ssh, &rmaxpack)) != 0)
1722: goto out;
1.22 markus 1723:
1.24 markus 1724: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1725: ctype, rchan, rwindow, rmaxpack);
1726:
1.40 markus 1727: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1.303 djm 1728: c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow,
1.289 markus 1729: rmaxpack);
1.261 millert 1730: } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) {
1.303 djm 1731: c = client_request_forwarded_streamlocal(ssh, ctype, rchan);
1.40 markus 1732: } else if (strcmp(ctype, "x11") == 0) {
1.303 djm 1733: c = client_request_x11(ssh, ctype, rchan);
1.40 markus 1734: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1.303 djm 1735: c = client_request_agent(ssh, ctype, rchan);
1.22 markus 1736: }
1.289 markus 1737: if (c != NULL && c->type == SSH_CHANNEL_MUX_CLIENT) {
1738: debug3("proxied to downstream: %s", ctype);
1739: } else if (c != NULL) {
1.22 markus 1740: debug("confirm %s", ctype);
1741: c->remote_id = rchan;
1.304 djm 1742: c->have_remote_id = 1;
1.22 markus 1743: c->remote_window = rwindow;
1744: c->remote_maxpacket = rmaxpack;
1.69 markus 1745: if (c->type != SSH_CHANNEL_CONNECTING) {
1.320 djm 1746: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
1747: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1748: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1749: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1750: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1751: (r = sshpkt_send(ssh)) != 0)
1752: sshpkt_fatal(ssh, r, "%s: send reply", __func__);
1.69 markus 1753: }
1.22 markus 1754: } else {
1755: debug("failure %s", ctype);
1.320 djm 1756: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE)) != 0 ||
1757: (r = sshpkt_put_u32(ssh, rchan)) != 0 ||
1758: (r = sshpkt_put_u32(ssh, SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED)) != 0 ||
1759: (r = sshpkt_put_cstring(ssh, "open failed")) != 0 ||
1760: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
1761: (r = sshpkt_send(ssh)) != 0)
1762: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.22 markus 1763: }
1.320 djm 1764: r = 0;
1765: out:
1.250 djm 1766: free(ctype);
1.320 djm 1767: return r;
1.22 markus 1768: }
1.267 djm 1769:
1.264 markus 1770: static int
1.297 markus 1771: client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
1.48 markus 1772: {
1773: Channel *c = NULL;
1.320 djm 1774: char *rtype = NULL;
1775: u_char reply;
1776: u_int id, exitval;
1777: int r, success = 0;
1778:
1779: if ((r = sshpkt_get_u32(ssh, &id)) != 0)
1780: return r;
1781: if (id <= INT_MAX)
1782: c = channel_lookup(ssh, id);
1.297 markus 1783: if (channel_proxy_upstream(c, type, seq, ssh))
1.289 markus 1784: return 0;
1.320 djm 1785: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
1786: (r = sshpkt_get_u8(ssh, &reply)) != 0)
1787: goto out;
1.48 markus 1788:
1.320 djm 1789: debug("client_input_channel_req: channel %u rtype %s reply %d",
1.48 markus 1790: id, rtype, reply);
1791:
1.320 djm 1792: if (c == NULL) {
1.197 djm 1793: error("client_input_channel_req: channel %d: "
1794: "unknown channel", id);
1.193 markus 1795: } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1.320 djm 1796: if ((r = sshpkt_get_end(ssh)) != 0)
1797: goto out;
1.303 djm 1798: chan_rcvd_eow(ssh, c);
1.48 markus 1799: } else if (strcmp(rtype, "exit-status") == 0) {
1.320 djm 1800: if ((r = sshpkt_get_u32(ssh, &exitval)) != 0)
1801: goto out;
1.217 djm 1802: if (c->ctl_chan != -1) {
1.303 djm 1803: mux_exit_message(ssh, c, exitval);
1.215 djm 1804: success = 1;
1.320 djm 1805: } else if ((int)id == session_ident) {
1.215 djm 1806: /* Record exit value of local session */
1.123 djm 1807: success = 1;
1808: exit_status = exitval;
1.215 djm 1809: } else {
1.218 djm 1810: /* Probably for a mux channel that has already closed */
1.354 djm 1811: debug_f("no sink for exit-status on channel %d",
1812: id);
1.123 djm 1813: }
1.320 djm 1814: if ((r = sshpkt_get_end(ssh)) != 0)
1815: goto out;
1.48 markus 1816: }
1.259 djm 1817: if (reply && c != NULL && !(c->flags & CHAN_CLOSE_SENT)) {
1.304 djm 1818: if (!c->have_remote_id)
1.354 djm 1819: fatal_f("channel %d: no remote_id", c->self);
1.320 djm 1820: if ((r = sshpkt_start(ssh, success ?
1821: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE)) != 0 ||
1822: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1823: (r = sshpkt_send(ssh)) != 0)
1824: sshpkt_fatal(ssh, r, "%s: send failure", __func__);
1.48 markus 1825: }
1.320 djm 1826: r = 0;
1827: out:
1.250 djm 1828: free(rtype);
1.320 djm 1829: return r;
1.48 markus 1830: }
1.267 djm 1831:
1.269 djm 1832: struct hostkeys_update_ctx {
1833: /* The hostname and (optionally) IP address string for the server */
1834: char *host_str, *ip_str;
1835:
1836: /*
1837: * Keys received from the server and a flag for each indicating
1838: * whether they already exist in known_hosts.
1.351 djm 1839: * keys_match is filled in by hostkeys_find() and later (for new
1.381 djm 1840: * keys) by client_global_hostkeys_prove_confirm().
1.269 djm 1841: */
1842: struct sshkey **keys;
1.351 djm 1843: u_int *keys_match; /* mask of HKF_MATCH_* from hostfile.h */
1844: int *keys_verified; /* flag for new keys verified by server */
1845: size_t nkeys, nnew, nincomplete; /* total, new keys, incomplete match */
1.269 djm 1846:
1847: /*
1848: * Keys that are in known_hosts, but were not present in the update
1849: * from the server (i.e. scheduled to be deleted).
1850: * Filled in by hostkeys_find().
1851: */
1852: struct sshkey **old_keys;
1853: size_t nold;
1.347 djm 1854:
1855: /* Various special cases. */
1.350 djm 1856: int complex_hostspec; /* wildcard or manual pattern-list host name */
1.347 djm 1857: int ca_available; /* saw CA key for this host */
1.352 djm 1858: int old_key_seen; /* saw old key with other name/addr */
1.353 djm 1859: int other_name_seen; /* saw key with other name/addr */
1.269 djm 1860: };
1861:
1862: static void
1863: hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx)
1864: {
1865: size_t i;
1866:
1867: if (ctx == NULL)
1868: return;
1869: for (i = 0; i < ctx->nkeys; i++)
1870: sshkey_free(ctx->keys[i]);
1871: free(ctx->keys);
1.351 djm 1872: free(ctx->keys_match);
1873: free(ctx->keys_verified);
1.269 djm 1874: for (i = 0; i < ctx->nold; i++)
1875: sshkey_free(ctx->old_keys[i]);
1876: free(ctx->old_keys);
1877: free(ctx->host_str);
1878: free(ctx->ip_str);
1879: free(ctx);
1880: }
1881:
1.350 djm 1882: /*
1883: * Returns non-zero if a known_hosts hostname list is not of a form that
1884: * can be handled by UpdateHostkeys. These include wildcard hostnames and
1885: * hostnames lists that do not follow the form host[,ip].
1886: */
1887: static int
1888: hostspec_is_complex(const char *hosts)
1889: {
1890: char *cp;
1891:
1892: /* wildcard */
1893: if (strchr(hosts, '*') != NULL || strchr(hosts, '?') != NULL)
1894: return 1;
1895: /* single host/ip = ok */
1896: if ((cp = strchr(hosts, ',')) == NULL)
1897: return 0;
1898: /* more than two entries on the line */
1899: if (strchr(cp + 1, ',') != NULL)
1900: return 1;
1901: /* XXX maybe parse cp+1 and ensure it is an IP? */
1902: return 0;
1903: }
1904:
1.352 djm 1905: /* callback to search for ctx->keys in known_hosts */
1.269 djm 1906: static int
1907: hostkeys_find(struct hostkey_foreach_line *l, void *_ctx)
1908: {
1909: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1910: size_t i;
1911: struct sshkey **tmp;
1912:
1.353 djm 1913: if (l->key == NULL)
1.269 djm 1914: return 0;
1.353 djm 1915: if (l->status != HKF_STATUS_MATCHED) {
1916: /* Record if one of the keys appears on a non-matching line */
1917: for (i = 0; i < ctx->nkeys; i++) {
1918: if (sshkey_equal(l->key, ctx->keys[i])) {
1919: ctx->other_name_seen = 1;
1.354 djm 1920: debug3_f("found %s key under different "
1921: "name/addr at %s:%ld",
1.353 djm 1922: sshkey_ssh_name(ctx->keys[i]),
1923: l->path, l->linenum);
1924: return 0;
1925: }
1926: }
1927: return 0;
1928: }
1929: /* Don't proceed if revocation or CA markers are present */
1930: /* XXX relax this */
1931: if (l->marker != MRK_NONE) {
1.354 djm 1932: debug3_f("hostkeys file %s:%ld has CA/revocation marker",
1933: l->path, l->linenum);
1.353 djm 1934: ctx->complex_hostspec = 1;
1935: return 0;
1936: }
1937:
1.355 djm 1938: /* If CheckHostIP is enabled, then check for mismatched hostname/addr */
1939: if (ctx->ip_str != NULL && strchr(l->hosts, ',') != NULL) {
1940: if ((l->match & HKF_MATCH_HOST) == 0) {
1941: /* Record if address matched a different hostname. */
1942: ctx->other_name_seen = 1;
1943: debug3_f("found address %s against different hostname "
1944: "at %s:%ld", ctx->ip_str, l->path, l->linenum);
1945: return 0;
1946: } else if ((l->match & HKF_MATCH_IP) == 0) {
1947: /* Record if hostname matched a different address. */
1948: ctx->other_name_seen = 1;
1949: debug3_f("found hostname %s against different address "
1950: "at %s:%ld", ctx->host_str, l->path, l->linenum);
1951: }
1.353 djm 1952: }
1.269 djm 1953:
1.350 djm 1954: /*
1955: * UpdateHostkeys is skipped for wildcard host names and hostnames
1956: * that contain more than two entries (ssh never writes these).
1957: */
1958: if (hostspec_is_complex(l->hosts)) {
1.354 djm 1959: debug3_f("hostkeys file %s:%ld complex host specification",
1960: l->path, l->linenum);
1.350 djm 1961: ctx->complex_hostspec = 1;
1.347 djm 1962: return 0;
1963: }
1964:
1.269 djm 1965: /* Mark off keys we've already seen for this host */
1966: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 1967: if (!sshkey_equal(l->key, ctx->keys[i]))
1968: continue;
1.354 djm 1969: debug3_f("found %s key at %s:%ld",
1.351 djm 1970: sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum);
1971: ctx->keys_match[i] |= l->match;
1972: return 0;
1.269 djm 1973: }
1974: /* This line contained a key that not offered by the server */
1.354 djm 1975: debug3_f("deprecated %s key at %s:%ld", sshkey_ssh_name(l->key),
1976: l->path, l->linenum);
1.299 deraadt 1977: if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1,
1.269 djm 1978: sizeof(*ctx->old_keys))) == NULL)
1.354 djm 1979: fatal_f("recallocarray failed nold = %zu", ctx->nold);
1.269 djm 1980: ctx->old_keys = tmp;
1981: ctx->old_keys[ctx->nold++] = l->key;
1982: l->key = NULL;
1983:
1984: return 0;
1985: }
1986:
1.352 djm 1987: /* callback to search for ctx->old_keys in known_hosts under other names */
1988: static int
1989: hostkeys_check_old(struct hostkey_foreach_line *l, void *_ctx)
1990: {
1991: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
1992: size_t i;
1993: int hashed;
1994:
1995: /* only care about lines that *don't* match the active host spec */
1996: if (l->status == HKF_STATUS_MATCHED || l->key == NULL)
1997: return 0;
1998:
1999: hashed = l->match & (HKF_MATCH_HOST_HASHED|HKF_MATCH_IP_HASHED);
2000: for (i = 0; i < ctx->nold; i++) {
2001: if (!sshkey_equal(l->key, ctx->old_keys[i]))
2002: continue;
1.354 djm 2003: debug3_f("found deprecated %s key at %s:%ld as %s",
1.364 djm 2004: sshkey_ssh_name(ctx->old_keys[i]), l->path, l->linenum,
1.352 djm 2005: hashed ? "[HASHED]" : l->hosts);
2006: ctx->old_key_seen = 1;
2007: break;
2008: }
2009: return 0;
2010: }
2011:
2012: /*
2013: * Check known_hosts files for deprecated keys under other names. Returns 0
2014: * on success or -1 on failure. Updates ctx->old_key_seen if deprecated keys
2015: * exist under names other than the active hostname/IP.
2016: */
2017: static int
2018: check_old_keys_othernames(struct hostkeys_update_ctx *ctx)
2019: {
2020: size_t i;
2021: int r;
2022:
1.354 djm 2023: debug2_f("checking for %zu deprecated keys", ctx->nold);
1.352 djm 2024: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 2025: debug3_f("searching %s for %s / %s",
1.352 djm 2026: options.user_hostfiles[i], ctx->host_str,
2027: ctx->ip_str ? ctx->ip_str : "(none)");
2028: if ((r = hostkeys_foreach(options.user_hostfiles[i],
2029: hostkeys_check_old, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 2030: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.352 djm 2031: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 2032: debug_f("hostkeys file %s does not exist",
2033: options.user_hostfiles[i]);
1.352 djm 2034: continue;
2035: }
1.354 djm 2036: error_fr(r, "hostkeys_foreach failed for %s",
2037: options.user_hostfiles[i]);
1.352 djm 2038: return -1;
2039: }
2040: }
2041: return 0;
2042: }
2043:
1.269 djm 2044: static void
1.337 djm 2045: hostkey_change_preamble(LogLevel loglevel)
1.269 djm 2046: {
1.336 djm 2047: do_log2(loglevel, "The server has updated its host keys.");
2048: do_log2(loglevel, "These changes were verified by the server's "
2049: "existing trusted key.");
2050: }
2051:
2052: static void
2053: update_known_hosts(struct hostkeys_update_ctx *ctx)
2054: {
2055: int r, was_raw = 0, first = 1;
2056: int asking = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK;
2057: LogLevel loglevel = asking ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE;
1.269 djm 2058: char *fp, *response;
2059: size_t i;
1.333 djm 2060: struct stat sb;
1.269 djm 2061:
2062: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2063: if (!ctx->keys_verified[i])
1.269 djm 2064: continue;
2065: if ((fp = sshkey_fingerprint(ctx->keys[i],
2066: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2067: fatal_f("sshkey_fingerprint failed");
1.336 djm 2068: if (first && asking)
1.337 djm 2069: hostkey_change_preamble(loglevel);
1.269 djm 2070: do_log2(loglevel, "Learned new hostkey: %s %s",
2071: sshkey_type(ctx->keys[i]), fp);
1.336 djm 2072: first = 0;
1.269 djm 2073: free(fp);
2074: }
2075: for (i = 0; i < ctx->nold; i++) {
2076: if ((fp = sshkey_fingerprint(ctx->old_keys[i],
2077: options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
1.354 djm 2078: fatal_f("sshkey_fingerprint failed");
1.336 djm 2079: if (first && asking)
1.337 djm 2080: hostkey_change_preamble(loglevel);
1.269 djm 2081: do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",
2082: sshkey_type(ctx->old_keys[i]), fp);
1.336 djm 2083: first = 0;
1.269 djm 2084: free(fp);
2085: }
2086: if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1.271 djm 2087: if (get_saved_tio() != NULL) {
2088: leave_raw_mode(1);
2089: was_raw = 1;
2090: }
1.269 djm 2091: response = NULL;
2092: for (i = 0; !quit_pending && i < 3; i++) {
2093: free(response);
2094: response = read_passphrase("Accept updated hostkeys? "
2095: "(yes/no): ", RP_ECHO);
1.389 dtucker 2096: if (response != NULL && strcasecmp(response, "yes") == 0)
1.269 djm 2097: break;
2098: else if (quit_pending || response == NULL ||
2099: strcasecmp(response, "no") == 0) {
2100: options.update_hostkeys = 0;
2101: break;
2102: } else {
2103: do_log2(loglevel, "Please enter "
2104: "\"yes\" or \"no\"");
2105: }
2106: }
2107: if (quit_pending || i >= 3 || response == NULL)
2108: options.update_hostkeys = 0;
2109: free(response);
1.271 djm 2110: if (was_raw)
2111: enter_raw_mode(1);
1.269 djm 2112: }
1.333 djm 2113: if (options.update_hostkeys == 0)
2114: return;
1.269 djm 2115: /*
2116: * Now that all the keys are verified, we can go ahead and replace
2117: * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't
2118: * cancel the operation).
2119: */
1.333 djm 2120: for (i = 0; i < options.num_user_hostfiles; i++) {
2121: /*
2122: * NB. keys are only added to hostfiles[0], for the rest we
2123: * just delete the hostname entries.
2124: */
2125: if (stat(options.user_hostfiles[i], &sb) != 0) {
2126: if (errno == ENOENT) {
1.354 djm 2127: debug_f("known hosts file %s does not "
2128: "exist", options.user_hostfiles[i]);
1.333 djm 2129: } else {
1.354 djm 2130: error_f("known hosts file %s "
2131: "inaccessible: %s",
2132: options.user_hostfiles[i], strerror(errno));
1.333 djm 2133: }
2134: continue;
2135: }
2136: if ((r = hostfile_replace_entries(options.user_hostfiles[i],
2137: ctx->host_str, ctx->ip_str,
2138: i == 0 ? ctx->keys : NULL, i == 0 ? ctx->nkeys : 0,
2139: options.hash_known_hosts, 0,
2140: options.fingerprint_hash)) != 0) {
1.354 djm 2141: error_fr(r, "hostfile_replace_entries failed for %s",
2142: options.user_hostfiles[i]);
1.333 djm 2143: }
2144: }
1.269 djm 2145: }
2146:
2147: static void
1.381 djm 2148: client_global_hostkeys_prove_confirm(struct ssh *ssh, int type,
1.303 djm 2149: u_int32_t seq, void *_ctx)
1.269 djm 2150: {
2151: struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx;
2152: size_t i, ndone;
2153: struct sshbuf *signdata;
1.375 djm 2154: int r, plaintype;
1.269 djm 2155: const u_char *sig;
1.375 djm 2156: const char *rsa_kexalg = NULL;
2157: char *alg = NULL;
1.269 djm 2158: size_t siglen;
2159:
2160: if (ctx->nnew == 0)
1.354 djm 2161: fatal_f("ctx->nnew == 0"); /* sanity */
1.269 djm 2162: if (type != SSH2_MSG_REQUEST_SUCCESS) {
2163: error("Server failed to confirm ownership of "
2164: "private host keys");
2165: hostkeys_update_ctx_free(ctx);
2166: return;
2167: }
1.375 djm 2168: if (sshkey_type_plain(sshkey_type_from_name(
2169: ssh->kex->hostkey_alg)) == KEY_RSA)
2170: rsa_kexalg = ssh->kex->hostkey_alg;
1.269 djm 2171: if ((signdata = sshbuf_new()) == NULL)
1.354 djm 2172: fatal_f("sshbuf_new failed");
1.269 djm 2173: /*
2174: * Expect a signature for each of the ctx->nnew private keys we
2175: * haven't seen before. They will be in the same order as the
1.351 djm 2176: * ctx->keys where the corresponding ctx->keys_match[i] == 0.
1.269 djm 2177: */
2178: for (ndone = i = 0; i < ctx->nkeys; i++) {
1.351 djm 2179: if (ctx->keys_match[i])
1.269 djm 2180: continue;
1.375 djm 2181: plaintype = sshkey_type_plain(ctx->keys[i]->type);
1.269 djm 2182: /* Prepare data to be signed: session ID, unique string, key */
2183: sshbuf_reset(signdata);
1.270 djm 2184: if ( (r = sshbuf_put_cstring(signdata,
2185: "hostkeys-prove-00@openssh.com")) != 0 ||
1.358 djm 2186: (r = sshbuf_put_stringb(signdata,
2187: ssh->kex->session_id)) != 0 ||
1.269 djm 2188: (r = sshkey_puts(ctx->keys[i], signdata)) != 0)
1.354 djm 2189: fatal_fr(r, "compose signdata");
1.269 djm 2190: /* Extract and verify signature */
2191: if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) {
1.354 djm 2192: error_fr(r, "parse sig");
1.269 djm 2193: goto out;
2194: }
1.375 djm 2195: if ((r = sshkey_get_sigtype(sig, siglen, &alg)) != 0) {
2196: error_fr(r, "server gave unintelligible signature "
2197: "for %s key %zu", sshkey_type(ctx->keys[i]), i);
2198: goto out;
2199: }
1.309 djm 2200: /*
1.375 djm 2201: * Special case for RSA keys: if a RSA hostkey was negotiated,
2202: * then use its signature type for verification of RSA hostkey
2203: * proofs. Otherwise, accept only RSA-SHA256/512 signatures.
1.309 djm 2204: */
1.375 djm 2205: if (plaintype == KEY_RSA && rsa_kexalg == NULL &&
2206: match_pattern_list(alg, HOSTKEY_PROOF_RSA_ALGS, 0) != 1) {
2207: debug_f("server used untrusted RSA signature algorithm "
2208: "%s for key %zu, disregarding", alg, i);
2209: free(alg);
2210: /* zap the key from the list */
2211: sshkey_free(ctx->keys[i]);
2212: ctx->keys[i] = NULL;
2213: ndone++;
2214: continue;
2215: }
2216: debug3_f("verify %s key %zu using sigalg %s",
2217: sshkey_type(ctx->keys[i]), i, alg);
2218: free(alg);
1.269 djm 2219: if ((r = sshkey_verify(ctx->keys[i], sig, siglen,
1.308 djm 2220: sshbuf_ptr(signdata), sshbuf_len(signdata),
1.375 djm 2221: plaintype == KEY_RSA ? rsa_kexalg : NULL, 0, NULL)) != 0) {
1.361 djm 2222: error_fr(r, "server gave bad signature for %s key %zu",
1.354 djm 2223: sshkey_type(ctx->keys[i]), i);
1.269 djm 2224: goto out;
2225: }
2226: /* Key is good. Mark it as 'seen' */
1.351 djm 2227: ctx->keys_verified[i] = 1;
1.269 djm 2228: ndone++;
2229: }
1.354 djm 2230: /* Shouldn't happen */
1.269 djm 2231: if (ndone != ctx->nnew)
1.354 djm 2232: fatal_f("ndone != ctx->nnew (%zu / %zu)", ndone, ctx->nnew);
1.320 djm 2233: if ((r = sshpkt_get_end(ssh)) != 0) {
1.354 djm 2234: error_f("protocol error");
1.320 djm 2235: goto out;
2236: }
1.269 djm 2237:
2238: /* Make the edits to known_hosts */
2239: update_known_hosts(ctx);
2240: out:
2241: hostkeys_update_ctx_free(ctx);
1.384 djm 2242: hostkeys_update_complete = 1;
2243: client_repledge();
1.269 djm 2244: }
2245:
1.267 djm 2246: /*
1.291 djm 2247: * Returns non-zero if the key is accepted by HostkeyAlgorithms.
2248: * Made slightly less trivial by the multiple RSA signature algorithm names.
2249: */
2250: static int
2251: key_accepted_by_hostkeyalgs(const struct sshkey *key)
2252: {
2253: const char *ktype = sshkey_ssh_name(key);
1.331 dtucker 2254: const char *hostkeyalgs = options.hostkeyalgorithms;
1.291 djm 2255:
1.391 djm 2256: if (key->type == KEY_UNSPEC)
1.291 djm 2257: return 0;
2258: if (key->type == KEY_RSA &&
2259: (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 ||
2260: match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1))
2261: return 1;
2262: return match_pattern_list(ktype, hostkeyalgs, 0) == 1;
2263: }
2264:
2265: /*
1.270 djm 2266: * Handle hostkeys-00@openssh.com global request to inform the client of all
1.267 djm 2267: * the server's hostkeys. The keys are checked against the user's
2268: * HostkeyAlgorithms preference before they are accepted.
2269: */
2270: static int
1.321 djm 2271: client_input_hostkeys(struct ssh *ssh)
1.267 djm 2272: {
2273: const u_char *blob = NULL;
1.269 djm 2274: size_t i, len = 0;
1.267 djm 2275: struct sshbuf *buf = NULL;
1.269 djm 2276: struct sshkey *key = NULL, **tmp;
1.384 djm 2277: int r, prove_sent = 0;
1.269 djm 2278: char *fp;
1.267 djm 2279: static int hostkeys_seen = 0; /* XXX use struct ssh */
1.268 djm 2280: extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */
1.272 djm 2281: struct hostkeys_update_ctx *ctx = NULL;
1.351 djm 2282: u_int want;
1.267 djm 2283:
2284: if (hostkeys_seen)
1.354 djm 2285: fatal_f("server already sent hostkeys");
1.384 djm 2286: if (!can_update_hostkeys())
1.267 djm 2287: return 1;
1.384 djm 2288: hostkeys_seen = 1;
1.272 djm 2289:
2290: ctx = xcalloc(1, sizeof(*ctx));
1.269 djm 2291: while (ssh_packet_remaining(ssh) > 0) {
1.267 djm 2292: sshkey_free(key);
2293: key = NULL;
1.269 djm 2294: if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) {
1.354 djm 2295: error_fr(r, "parse key");
1.269 djm 2296: goto out;
2297: }
1.270 djm 2298: if ((r = sshkey_from_blob(blob, len, &key)) != 0) {
1.354 djm 2299: do_log2_fr(r, r == SSH_ERR_KEY_TYPE_UNKNOWN ?
1.335 djm 2300: SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_ERROR,
1.354 djm 2301: "convert key");
1.335 djm 2302: continue;
1.270 djm 2303: }
1.267 djm 2304: fp = sshkey_fingerprint(key, options.fingerprint_hash,
2305: SSH_FP_DEFAULT);
1.354 djm 2306: debug3_f("received %s key %s", sshkey_type(key), fp);
1.267 djm 2307: free(fp);
1.275 markus 2308:
1.291 djm 2309: if (!key_accepted_by_hostkeyalgs(key)) {
1.354 djm 2310: debug3_f("%s key not permitted by "
2311: "HostkeyAlgorithms", sshkey_ssh_name(key));
1.267 djm 2312: continue;
2313: }
1.269 djm 2314: /* Skip certs */
2315: if (sshkey_is_cert(key)) {
1.354 djm 2316: debug3_f("%s key is a certificate; skipping",
2317: sshkey_ssh_name(key));
1.269 djm 2318: continue;
2319: }
2320: /* Ensure keys are unique */
2321: for (i = 0; i < ctx->nkeys; i++) {
2322: if (sshkey_equal(key, ctx->keys[i])) {
1.354 djm 2323: error_f("received duplicated %s host key",
2324: sshkey_ssh_name(key));
1.269 djm 2325: goto out;
2326: }
2327: }
2328: /* Key is good, record it */
1.299 deraadt 2329: if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1,
1.269 djm 2330: sizeof(*ctx->keys))) == NULL)
1.354 djm 2331: fatal_f("recallocarray failed nkeys = %zu",
2332: ctx->nkeys);
1.269 djm 2333: ctx->keys = tmp;
2334: ctx->keys[ctx->nkeys++] = key;
1.267 djm 2335: key = NULL;
2336: }
2337:
1.269 djm 2338: if (ctx->nkeys == 0) {
1.354 djm 2339: debug_f("server sent no hostkeys");
1.267 djm 2340: goto out;
2341: }
1.270 djm 2342:
1.351 djm 2343: if ((ctx->keys_match = calloc(ctx->nkeys,
2344: sizeof(*ctx->keys_match))) == NULL ||
2345: (ctx->keys_verified = calloc(ctx->nkeys,
2346: sizeof(*ctx->keys_verified))) == NULL)
1.354 djm 2347: fatal_f("calloc failed");
1.267 djm 2348:
1.268 djm 2349: get_hostfile_hostname_ipaddr(host,
2350: options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL,
1.269 djm 2351: options.port, &ctx->host_str,
2352: options.check_host_ip ? &ctx->ip_str : NULL);
1.268 djm 2353:
1.269 djm 2354: /* Find which keys we already know about. */
1.333 djm 2355: for (i = 0; i < options.num_user_hostfiles; i++) {
1.354 djm 2356: debug_f("searching %s for %s / %s",
1.339 dtucker 2357: options.user_hostfiles[i], ctx->host_str,
1.340 dtucker 2358: ctx->ip_str ? ctx->ip_str : "(none)");
1.333 djm 2359: if ((r = hostkeys_foreach(options.user_hostfiles[i],
2360: hostkeys_find, ctx, ctx->host_str, ctx->ip_str,
1.356 djm 2361: HKF_WANT_PARSE_KEY, 0)) != 0) {
1.333 djm 2362: if (r == SSH_ERR_SYSTEM_ERROR && errno == ENOENT) {
1.354 djm 2363: debug_f("hostkeys file %s does not exist",
2364: options.user_hostfiles[i]);
1.333 djm 2365: continue;
2366: }
1.354 djm 2367: error_fr(r, "hostkeys_foreach failed for %s",
2368: options.user_hostfiles[i]);
1.333 djm 2369: goto out;
2370: }
1.267 djm 2371: }
2372:
1.269 djm 2373: /* Figure out if we have any new keys to add */
1.351 djm 2374: ctx->nnew = ctx->nincomplete = 0;
2375: want = HKF_MATCH_HOST | ( options.check_host_ip ? HKF_MATCH_IP : 0);
1.269 djm 2376: for (i = 0; i < ctx->nkeys; i++) {
1.351 djm 2377: if (ctx->keys_match[i] == 0)
1.269 djm 2378: ctx->nnew++;
1.351 djm 2379: if ((ctx->keys_match[i] & want) != want)
2380: ctx->nincomplete++;
1.269 djm 2381: }
2382:
1.354 djm 2383: debug3_f("%zu server keys: %zu new, %zu retained, "
2384: "%zu incomplete match. %zu to remove", ctx->nkeys, ctx->nnew,
2385: ctx->nkeys - ctx->nnew - ctx->nincomplete,
1.351 djm 2386: ctx->nincomplete, ctx->nold);
1.269 djm 2387:
1.353 djm 2388: if (ctx->nnew == 0 && ctx->nold == 0) {
1.354 djm 2389: debug_f("no new or deprecated keys from server");
1.353 djm 2390: goto out;
2391: }
2392:
2393: /* Various reasons why we cannot proceed with the update */
2394: if (ctx->complex_hostspec) {
1.354 djm 2395: debug_f("CA/revocation marker, manual host list or wildcard "
2396: "host pattern found, skipping UserKnownHostsFile update");
1.353 djm 2397: goto out;
2398: }
2399: if (ctx->other_name_seen) {
1.354 djm 2400: debug_f("host key found matching a different name/address, "
2401: "skipping UserKnownHostsFile update");
1.347 djm 2402: goto out;
1.352 djm 2403: }
2404: /*
2405: * If removing keys, check whether they appear under different
2406: * names/addresses and refuse to proceed if they do. This avoids
2407: * cases such as hosts with multiple names becoming inconsistent
2408: * with regards to CheckHostIP entries.
2409: * XXX UpdateHostkeys=force to override this (and other) checks?
2410: */
2411: if (ctx->nold != 0) {
2412: if (check_old_keys_othernames(ctx) != 0)
2413: goto out; /* error already logged */
2414: if (ctx->old_key_seen) {
1.354 djm 2415: debug_f("key(s) for %s%s%s exist under other names; "
2416: "skipping UserKnownHostsFile update",
1.352 djm 2417: ctx->host_str, ctx->ip_str == NULL ? "" : ",",
2418: ctx->ip_str == NULL ? "" : ctx->ip_str);
2419: goto out;
2420: }
2421: }
2422:
1.353 djm 2423: if (ctx->nnew == 0) {
1.351 djm 2424: /*
2425: * We have some keys to remove or fix matching for.
2426: * We can proceed to do this without requiring a fresh proof
2427: * from the server.
2428: */
1.269 djm 2429: update_known_hosts(ctx);
1.353 djm 2430: goto out;
2431: }
2432: /*
2433: * We have received previously-unseen keys from the server.
2434: * Ask the server to confirm ownership of the private halves.
2435: */
1.354 djm 2436: debug3_f("asking server to prove ownership for %zu keys", ctx->nnew);
1.353 djm 2437: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2438: (r = sshpkt_put_cstring(ssh,
2439: "hostkeys-prove-00@openssh.com")) != 0 ||
2440: (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */
1.354 djm 2441: fatal_fr(r, "prepare hostkeys-prove");
1.353 djm 2442: if ((buf = sshbuf_new()) == NULL)
1.354 djm 2443: fatal_f("sshbuf_new");
1.353 djm 2444: for (i = 0; i < ctx->nkeys; i++) {
2445: if (ctx->keys_match[i])
2446: continue;
2447: sshbuf_reset(buf);
2448: if ((r = sshkey_putb(ctx->keys[i], buf)) != 0 ||
1.354 djm 2449: (r = sshpkt_put_stringb(ssh, buf)) != 0)
2450: fatal_fr(r, "assemble hostkeys-prove");
1.269 djm 2451: }
1.353 djm 2452: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2453: fatal_fr(r, "send hostkeys-prove");
1.353 djm 2454: client_register_global_confirm(
1.381 djm 2455: client_global_hostkeys_prove_confirm, ctx);
1.353 djm 2456: ctx = NULL; /* will be freed in callback */
1.384 djm 2457: prove_sent = 1;
1.269 djm 2458:
1.267 djm 2459: /* Success */
2460: out:
1.269 djm 2461: hostkeys_update_ctx_free(ctx);
1.267 djm 2462: sshkey_free(key);
2463: sshbuf_free(buf);
1.384 djm 2464: if (!prove_sent) {
2465: /* UpdateHostkeys handling completed */
2466: hostkeys_update_complete = 1;
2467: client_repledge();
2468: }
1.269 djm 2469: /*
2470: * NB. Return success for all cases. The server doesn't need to know
2471: * what the client does with its hosts file.
2472: */
2473: return 1;
1.267 djm 2474: }
2475:
1.264 markus 2476: static int
1.297 markus 2477: client_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
1.95 markus 2478: {
2479: char *rtype;
1.320 djm 2480: u_char want_reply;
2481: int r, success = 0;
1.95 markus 2482:
1.320 djm 2483: if ((r = sshpkt_get_cstring(ssh, &rtype, NULL)) != 0 ||
2484: (r = sshpkt_get_u8(ssh, &want_reply)) != 0)
2485: goto out;
1.117 markus 2486: debug("client_input_global_request: rtype %s want_reply %d",
2487: rtype, want_reply);
1.270 djm 2488: if (strcmp(rtype, "hostkeys-00@openssh.com") == 0)
1.321 djm 2489: success = client_input_hostkeys(ssh);
1.95 markus 2490: if (want_reply) {
1.320 djm 2491: if ((r = sshpkt_start(ssh, success ? SSH2_MSG_REQUEST_SUCCESS :
2492: SSH2_MSG_REQUEST_FAILURE)) != 0 ||
2493: (r = sshpkt_send(ssh)) != 0 ||
2494: (r = ssh_packet_write_wait(ssh)) != 0)
2495: goto out;
1.95 markus 2496: }
1.320 djm 2497: r = 0;
2498: out:
1.250 djm 2499: free(rtype);
1.320 djm 2500: return r;
1.95 markus 2501: }
1.22 markus 2502:
1.354 djm 2503: static void
2504: client_send_env(struct ssh *ssh, int id, const char *name, const char *val)
2505: {
2506: int r;
2507:
2508: debug("channel %d: setting env %s = \"%s\"", id, name, val);
2509: channel_request_start(ssh, id, "env", 0);
2510: if ((r = sshpkt_put_cstring(ssh, name)) != 0 ||
2511: (r = sshpkt_put_cstring(ssh, val)) != 0 ||
2512: (r = sshpkt_send(ssh)) != 0)
2513: fatal_fr(r, "send setenv");
2514: }
2515:
1.123 djm 2516: void
1.303 djm 2517: client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
1.315 markus 2518: const char *term, struct termios *tiop, int in_fd, struct sshbuf *cmd,
2519: char **env)
1.123 djm 2520: {
1.380 djm 2521: size_t i, j, len;
2522: int matched, r;
1.313 djm 2523: char *name, *val;
1.132 djm 2524: Channel *c = NULL;
1.123 djm 2525:
1.354 djm 2526: debug2_f("id %d", id);
1.123 djm 2527:
1.303 djm 2528: if ((c = channel_lookup(ssh, id)) == NULL)
1.354 djm 2529: fatal_f("channel %d: unknown channel", id);
1.224 djm 2530:
1.320 djm 2531: ssh_packet_set_interactive(ssh, want_tty,
1.224 djm 2532: options.ip_qos_interactive, options.ip_qos_bulk);
1.132 djm 2533:
1.123 djm 2534: if (want_tty) {
2535: struct winsize ws;
2536:
2537: /* Store window size in the packet. */
1.326 deraadt 2538: if (ioctl(in_fd, TIOCGWINSZ, &ws) == -1)
1.123 djm 2539: memset(&ws, 0, sizeof(ws));
2540:
1.303 djm 2541: channel_request_start(ssh, id, "pty-req", 1);
2542: client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY);
1.320 djm 2543: if ((r = sshpkt_put_cstring(ssh, term != NULL ? term : ""))
2544: != 0 ||
2545: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 ||
2546: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 ||
2547: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 ||
2548: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0)
1.354 djm 2549: fatal_fr(r, "build pty-req");
1.194 djm 2550: if (tiop == NULL)
2551: tiop = get_saved_tio();
1.316 markus 2552: ssh_tty_make_modes(ssh, -1, tiop);
1.320 djm 2553: if ((r = sshpkt_send(ssh)) != 0)
1.354 djm 2554: fatal_fr(r, "send pty-req");
1.123 djm 2555: /* XXX wait for reply */
1.132 djm 2556: c->client_tty = 1;
1.123 djm 2557: }
2558:
2559: /* Transfer any environment variables from client to server */
1.126 djm 2560: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 2561: debug("Sending environment.");
1.126 djm 2562: for (i = 0; env[i] != NULL; i++) {
1.123 djm 2563: /* Split */
1.126 djm 2564: name = xstrdup(env[i]);
1.123 djm 2565: if ((val = strchr(name, '=')) == NULL) {
1.250 djm 2566: free(name);
1.123 djm 2567: continue;
2568: }
2569: *val++ = '\0';
2570:
2571: matched = 0;
2572: for (j = 0; j < options.num_send_env; j++) {
2573: if (match_pattern(name, options.send_env[j])) {
2574: matched = 1;
2575: break;
2576: }
2577: }
2578: if (!matched) {
2579: debug3("Ignored env %s", name);
1.250 djm 2580: free(name);
1.123 djm 2581: continue;
2582: }
1.354 djm 2583: client_send_env(ssh, id, name, val);
1.250 djm 2584: free(name);
1.123 djm 2585: }
1.313 djm 2586: }
2587: for (i = 0; i < options.num_setenv; i++) {
2588: /* Split */
2589: name = xstrdup(options.setenv[i]);
2590: if ((val = strchr(name, '=')) == NULL) {
2591: free(name);
2592: continue;
2593: }
2594: *val++ = '\0';
1.354 djm 2595: client_send_env(ssh, id, name, val);
1.313 djm 2596: free(name);
1.123 djm 2597: }
2598:
1.315 markus 2599: len = sshbuf_len(cmd);
1.123 djm 2600: if (len > 0) {
2601: if (len > 900)
2602: len = 900;
2603: if (want_subsystem) {
1.190 djm 2604: debug("Sending subsystem: %.*s",
1.380 djm 2605: (int)len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2606: channel_request_start(ssh, id, "subsystem", 1);
2607: client_expect_confirm(ssh, id, "subsystem",
2608: CONFIRM_CLOSE);
1.123 djm 2609: } else {
1.190 djm 2610: debug("Sending command: %.*s",
1.380 djm 2611: (int)len, (const u_char*)sshbuf_ptr(cmd));
1.303 djm 2612: channel_request_start(ssh, id, "exec", 1);
2613: client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE);
1.123 djm 2614: }
1.320 djm 2615: if ((r = sshpkt_put_stringb(ssh, cmd)) != 0 ||
2616: (r = sshpkt_send(ssh)) != 0)
1.354 djm 2617: fatal_fr(r, "send command");
1.123 djm 2618: } else {
1.303 djm 2619: channel_request_start(ssh, id, "shell", 1);
2620: client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE);
1.354 djm 2621: if ((r = sshpkt_send(ssh)) != 0)
2622: fatal_fr(r, "send shell");
1.123 djm 2623: }
1.384 djm 2624:
2625: session_setup_complete = 1;
2626: client_repledge();
1.123 djm 2627: }
2628:
1.77 itojun 2629: static void
1.321 djm 2630: client_init_dispatch(struct ssh *ssh)
1.16 markus 2631: {
1.321 djm 2632: ssh_dispatch_init(ssh, &dispatch_protocol_error);
1.100 markus 2633:
1.321 djm 2634: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
2635: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_DATA, &channel_input_data);
2636: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
2637: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
2638: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
2639: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2640: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2641: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
2642: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
2643: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
2644: ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
2645: ssh_dispatch_set(ssh, SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 2646:
2647: /* rekeying */
1.321 djm 2648: ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 2649:
2650: /* global request reply messages */
1.321 djm 2651: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2652: ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.232 djm 2653: }
2654:
2655: void
2656: client_stop_mux(void)
2657: {
2658: if (options.control_path != NULL && muxserver_sock != -1)
2659: unlink(options.control_path);
2660: /*
1.247 dtucker 2661: * If we are in persist mode, or don't have a shell, signal that we
2662: * should close when all active channels are closed.
1.232 djm 2663: */
1.366 djm 2664: if (options.control_persist || options.session_type == SESSION_TYPE_NONE) {
1.232 djm 2665: session_closed = 1;
1.235 djm 2666: setproctitle("[stopped mux]");
2667: }
1.113 markus 2668: }
2669:
2670: /* client specific fatal cleanup */
2671: void
1.114 markus 2672: cleanup_exit(int i)
1.113 markus 2673: {
1.233 djm 2674: leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
1.192 djm 2675: if (options.control_path != NULL && muxserver_sock != -1)
1.123 djm 2676: unlink(options.control_path);
1.223 djm 2677: ssh_kill_proxy_command();
1.114 markus 2678: _exit(i);
1.1 deraadt 2679: }