Annotation of src/usr.bin/ssh/channels.c, Revision 1.139
1.1 deraadt 1: /*
1.26 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
5: * This file contains functions for generic socket connection forwarding.
6: * There is also code for initiating connection forwarding for X11 connections,
7: * arbitrary tcp/ip connections, and the authentication agent connection.
1.49 markus 8: *
1.67 deraadt 9: * As far as I am concerned, the code I have written for this software
10: * can be used freely for any purpose. Any derived versions of this
11: * software must be clearly marked as such, and if the derived work is
12: * incompatible with the protocol description in the RFC file, it must be
13: * called by a name other than "ssh" or "Secure Shell".
14: *
1.44 markus 15: * SSH2 support added by Markus Friedl.
1.128 markus 16: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.67 deraadt 17: * Copyright (c) 1999 Dug Song. All rights reserved.
18: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
19: *
20: * Redistribution and use in source and binary forms, with or without
21: * modification, are permitted provided that the following conditions
22: * are met:
23: * 1. Redistributions of source code must retain the above copyright
24: * notice, this list of conditions and the following disclaimer.
25: * 2. Redistributions in binary form must reproduce the above copyright
26: * notice, this list of conditions and the following disclaimer in the
27: * documentation and/or other materials provided with the distribution.
28: *
29: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
30: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.26 deraadt 39: */
1.1 deraadt 40:
41: #include "includes.h"
1.139 ! markus 42: RCSID("$OpenBSD: channels.c,v 1.138 2001/10/08 11:48:57 markus Exp $");
1.1 deraadt 43:
44: #include "ssh.h"
1.82 markus 45: #include "ssh1.h"
46: #include "ssh2.h"
1.1 deraadt 47: #include "packet.h"
48: #include "xmalloc.h"
49: #include "uidswap.h"
1.82 markus 50: #include "log.h"
51: #include "misc.h"
1.14 markus 52: #include "channels.h"
53: #include "compat.h"
1.82 markus 54: #include "canohost.h"
1.64 markus 55: #include "key.h"
56: #include "authfd.h"
1.44 markus 57:
1.1 deraadt 58:
1.121 markus 59: /* -- channel core */
1.12 markus 60:
1.27 markus 61: /*
62: * Pointer to an array containing all allocated channels. The array is
63: * dynamically extended as needed.
64: */
1.113 markus 65: static Channel **channels = NULL;
1.1 deraadt 66:
1.27 markus 67: /*
68: * Size of the channel array. All slots of the array must always be
1.113 markus 69: * initialized (at least the type field); unused slots set to NULL
1.27 markus 70: */
1.1 deraadt 71: static int channels_alloc = 0;
72:
1.27 markus 73: /*
74: * Maximum file descriptor value used in any of the channels. This is
1.113 markus 75: * updated in channel_new.
1.27 markus 76: */
1.84 markus 77: static int channel_max_fd = 0;
1.1 deraadt 78:
79:
1.121 markus 80: /* -- tcp forwarding */
1.1 deraadt 81:
1.27 markus 82: /*
83: * Data structure for storing which hosts are permitted for forward requests.
84: * The local sides of any remote forwards are stored in this array to prevent
85: * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
86: * network (which might be behind a firewall).
87: */
1.25 markus 88: typedef struct {
1.41 markus 89: char *host_to_connect; /* Connect to 'host'. */
90: u_short port_to_connect; /* Connect to 'port'. */
91: u_short listen_port; /* Remote side should listen port number. */
1.1 deraadt 92: } ForwardPermission;
93:
94: /* List of all permitted host/port pairs to connect. */
95: static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
1.121 markus 96:
1.1 deraadt 97: /* Number of permitted host/port pairs in the array. */
98: static int num_permitted_opens = 0;
1.27 markus 99: /*
100: * If this is true, all opens are permitted. This is the case on the server
101: * on which we have to trust the client anyway, and the user could do
102: * anything after logging in anyway.
103: */
1.1 deraadt 104: static int all_opens_permitted = 0;
105:
1.121 markus 106:
107: /* -- X11 forwarding */
108:
109: /* Maximum number of fake X11 displays to try. */
110: #define MAX_DISPLAYS 1000
111:
112: /* Saved X11 authentication protocol name. */
113: static char *x11_saved_proto = NULL;
114:
115: /* Saved X11 authentication data. This is the real data. */
116: static char *x11_saved_data = NULL;
117: static u_int x11_saved_data_len = 0;
118:
119: /*
120: * Fake X11 authentication data. This is what the server will be sending us;
121: * we should replace any occurrences of this by the real data.
122: */
123: static char *x11_fake_data = NULL;
124: static u_int x11_fake_data_len;
125:
126:
127: /* -- agent forwarding */
128:
129: #define NUM_SOCKS 10
130:
131: /* Name and directory of socket for authentication agent forwarding. */
132: static char *auth_sock_name = NULL;
133: static char *auth_sock_dir = NULL;
134:
1.82 markus 135: /* AF_UNSPEC or AF_INET or AF_INET6 */
1.135 markus 136: static int IPv4or6 = AF_UNSPEC;
1.1 deraadt 137:
1.121 markus 138: /* helper */
1.127 itojun 139: static void port_open_helper(Channel *c, char *rtype);
1.103 markus 140:
1.121 markus 141: /* -- channel core */
1.41 markus 142:
143: Channel *
144: channel_lookup(int id)
145: {
146: Channel *c;
1.113 markus 147:
1.63 provos 148: if (id < 0 || id > channels_alloc) {
1.41 markus 149: log("channel_lookup: %d: bad id", id);
150: return NULL;
151: }
1.113 markus 152: c = channels[id];
153: if (c == NULL) {
1.41 markus 154: log("channel_lookup: %d: bad id: channel free", id);
155: return NULL;
156: }
157: return c;
1.55 markus 158: }
159:
1.27 markus 160: /*
1.55 markus 161: * Register filedescriptors for a channel, used when allocating a channel or
1.52 markus 162: * when the channel consumer/producer is ready, e.g. shell exec'd
1.27 markus 163: */
1.1 deraadt 164:
1.127 itojun 165: static void
1.71 markus 166: channel_register_fds(Channel *c, int rfd, int wfd, int efd,
167: int extusage, int nonblock)
1.1 deraadt 168: {
1.25 markus 169: /* Update the maximum file descriptor value. */
1.84 markus 170: channel_max_fd = MAX(channel_max_fd, rfd);
171: channel_max_fd = MAX(channel_max_fd, wfd);
172: channel_max_fd = MAX(channel_max_fd, efd);
173:
1.27 markus 174: /* XXX set close-on-exec -markus */
1.55 markus 175:
1.52 markus 176: c->rfd = rfd;
177: c->wfd = wfd;
178: c->sock = (rfd == wfd) ? rfd : -1;
179: c->efd = efd;
180: c->extended_usage = extusage;
1.71 markus 181:
1.91 markus 182: /* XXX ugly hack: nonblock is only set by the server */
183: if (nonblock && isatty(c->rfd)) {
1.94 markus 184: debug("channel %d: rfd %d isatty", c->self, c->rfd);
1.91 markus 185: c->isatty = 1;
186: if (!isatty(c->wfd)) {
1.94 markus 187: error("channel %d: wfd %d is not a tty?",
1.91 markus 188: c->self, c->wfd);
189: }
190: } else {
191: c->isatty = 0;
192: }
193:
1.71 markus 194: /* enable nonblocking mode */
195: if (nonblock) {
196: if (rfd != -1)
197: set_nonblock(rfd);
198: if (wfd != -1)
199: set_nonblock(wfd);
200: if (efd != -1)
201: set_nonblock(efd);
202: }
1.52 markus 203: }
204:
205: /*
206: * Allocate a new channel object and set its type and socket. This will cause
207: * remote_name to be freed.
208: */
209:
1.113 markus 210: Channel *
1.52 markus 211: channel_new(char *ctype, int type, int rfd, int wfd, int efd,
1.71 markus 212: int window, int maxpack, int extusage, char *remote_name, int nonblock)
1.52 markus 213: {
214: int i, found;
215: Channel *c;
1.25 markus 216:
217: /* Do initial allocation if this is the first call. */
218: if (channels_alloc == 0) {
1.44 markus 219: chan_init();
1.25 markus 220: channels_alloc = 10;
1.113 markus 221: channels = xmalloc(channels_alloc * sizeof(Channel *));
1.25 markus 222: for (i = 0; i < channels_alloc; i++)
1.113 markus 223: channels[i] = NULL;
1.126 markus 224: fatal_add_cleanup((void (*) (void *)) channel_free_all, NULL);
1.25 markus 225: }
226: /* Try to find a free slot where to put the new channel. */
227: for (found = -1, i = 0; i < channels_alloc; i++)
1.113 markus 228: if (channels[i] == NULL) {
1.25 markus 229: /* Found a free slot. */
230: found = i;
231: break;
232: }
233: if (found == -1) {
1.27 markus 234: /* There are no free slots. Take last+1 slot and expand the array. */
1.25 markus 235: found = channels_alloc;
236: channels_alloc += 10;
1.70 markus 237: debug2("channel: expanding %d", channels_alloc);
1.113 markus 238: channels = xrealloc(channels, channels_alloc * sizeof(Channel *));
1.25 markus 239: for (i = found; i < channels_alloc; i++)
1.113 markus 240: channels[i] = NULL;
1.25 markus 241: }
1.113 markus 242: /* Initialize and return new channel. */
243: c = channels[found] = xmalloc(sizeof(Channel));
1.137 markus 244: memset(c, 0, sizeof(Channel));
1.25 markus 245: buffer_init(&c->input);
246: buffer_init(&c->output);
1.41 markus 247: buffer_init(&c->extended);
1.25 markus 248: chan_init_iostates(c);
1.71 markus 249: channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
1.25 markus 250: c->self = found;
251: c->type = type;
1.41 markus 252: c->ctype = ctype;
1.51 markus 253: c->local_window = window;
254: c->local_window_max = window;
255: c->local_consumed = 0;
256: c->local_maxpacket = maxpack;
1.25 markus 257: c->remote_id = -1;
258: c->remote_name = remote_name;
1.41 markus 259: c->remote_window = 0;
260: c->remote_maxpacket = 0;
261: c->cb_fn = NULL;
262: c->cb_arg = NULL;
263: c->cb_event = 0;
1.133 markus 264: c->force_drain = 0;
1.131 markus 265: c->detach_user = NULL;
1.65 markus 266: c->input_filter = NULL;
1.25 markus 267: debug("channel %d: new [%s]", found, remote_name);
1.113 markus 268: return c;
1.1 deraadt 269: }
1.52 markus 270:
1.132 markus 271: static int
272: channel_find_maxfd(void)
273: {
274: int i, max = 0;
275: Channel *c;
276:
277: for (i = 0; i < channels_alloc; i++) {
278: c = channels[i];
279: if (c != NULL) {
280: max = MAX(max, c->rfd);
281: max = MAX(max, c->wfd);
282: max = MAX(max, c->efd);
283: }
284: }
285: return max;
286: }
287:
288: int
289: channel_close_fd(int *fdp)
290: {
291: int ret = 0, fd = *fdp;
292:
293: if (fd != -1) {
294: ret = close(fd);
295: *fdp = -1;
296: if (fd == channel_max_fd)
297: channel_max_fd = channel_find_maxfd();
298: }
299: return ret;
300: }
301:
1.52 markus 302: /* Close all channel fd/socket. */
303:
1.127 itojun 304: static void
1.52 markus 305: channel_close_fds(Channel *c)
306: {
1.118 markus 307: debug3("channel_close_fds: channel %d: r %d w %d e %d",
308: c->self, c->rfd, c->wfd, c->efd);
309:
1.132 markus 310: channel_close_fd(&c->sock);
311: channel_close_fd(&c->rfd);
312: channel_close_fd(&c->wfd);
313: channel_close_fd(&c->efd);
1.121 markus 314: }
315:
316: /* Free the channel and close its fd/socket. */
317:
318: void
319: channel_free(Channel *c)
320: {
321: char *s;
322: int i, n;
323:
324: for (n = 0, i = 0; i < channels_alloc; i++)
325: if (channels[i])
326: n++;
327: debug("channel_free: channel %d: %s, nchannels %d", c->self,
328: c->remote_name ? c->remote_name : "???", n);
329:
330: s = channel_open_message();
331: debug3("channel_free: status: %s", s);
332: xfree(s);
333:
1.131 markus 334: if (c->detach_user != NULL) {
335: debug("channel_free: channel %d: detaching channel user", c->self);
336: c->detach_user(c->self, NULL);
1.121 markus 337: }
338: if (c->sock != -1)
339: shutdown(c->sock, SHUT_RDWR);
340: channel_close_fds(c);
341: buffer_free(&c->input);
342: buffer_free(&c->output);
343: buffer_free(&c->extended);
344: if (c->remote_name) {
345: xfree(c->remote_name);
346: c->remote_name = NULL;
347: }
348: channels[c->self] = NULL;
349: xfree(c);
350: }
351:
352: void
1.126 markus 353: channel_free_all(void)
1.121 markus 354: {
355: int i;
356:
1.126 markus 357: for (i = 0; i < channels_alloc; i++)
358: if (channels[i] != NULL)
359: channel_free(channels[i]);
1.131 markus 360: }
361:
1.121 markus 362: /*
363: * Closes the sockets/fds of all channels. This is used to close extra file
364: * descriptors after a fork.
365: */
366:
367: void
368: channel_close_all()
369: {
370: int i;
371:
372: for (i = 0; i < channels_alloc; i++)
373: if (channels[i] != NULL)
374: channel_close_fds(channels[i]);
375: }
376:
377: /*
1.131 markus 378: * Stop listening to channels.
379: */
380:
381: void
382: channel_stop_listening(void)
383: {
384: int i;
385: Channel *c;
386:
387: for (i = 0; i < channels_alloc; i++) {
388: c = channels[i];
389: if (c != NULL) {
390: switch (c->type) {
391: case SSH_CHANNEL_AUTH_SOCKET:
392: case SSH_CHANNEL_PORT_LISTENER:
393: case SSH_CHANNEL_RPORT_LISTENER:
394: case SSH_CHANNEL_X11_LISTENER:
1.132 markus 395: channel_close_fd(&c->sock);
1.131 markus 396: channel_free(c);
397: break;
398: }
399: }
400: }
401: }
402:
403: /*
1.121 markus 404: * Returns true if no channel has too much buffered data, and false if one or
405: * more channel is overfull.
406: */
407:
408: int
409: channel_not_very_much_buffered_data()
410: {
411: u_int i;
412: Channel *c;
413:
414: for (i = 0; i < channels_alloc; i++) {
415: c = channels[i];
416: if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
1.136 markus 417: #if 0
418: if (!compat20 &&
419: buffer_len(&c->input) > packet_get_maxsize()) {
1.121 markus 420: debug("channel %d: big input buffer %d",
421: c->self, buffer_len(&c->input));
422: return 0;
423: }
1.136 markus 424: #endif
1.121 markus 425: if (buffer_len(&c->output) > packet_get_maxsize()) {
1.136 markus 426: debug("channel %d: big output buffer %d > %d",
427: c->self, buffer_len(&c->output),
428: packet_get_maxsize());
1.121 markus 429: return 0;
430: }
431: }
432: }
433: return 1;
434: }
435:
436: /* Returns true if any channel is still open. */
437:
438: int
439: channel_still_open()
440: {
441: int i;
442: Channel *c;
443:
444: for (i = 0; i < channels_alloc; i++) {
445: c = channels[i];
446: if (c == NULL)
447: continue;
448: switch (c->type) {
449: case SSH_CHANNEL_X11_LISTENER:
450: case SSH_CHANNEL_PORT_LISTENER:
451: case SSH_CHANNEL_RPORT_LISTENER:
452: case SSH_CHANNEL_CLOSED:
453: case SSH_CHANNEL_AUTH_SOCKET:
454: case SSH_CHANNEL_DYNAMIC:
455: case SSH_CHANNEL_CONNECTING:
456: case SSH_CHANNEL_ZOMBIE:
457: continue;
458: case SSH_CHANNEL_LARVAL:
459: if (!compat20)
460: fatal("cannot happen: SSH_CHANNEL_LARVAL");
461: continue;
462: case SSH_CHANNEL_OPENING:
463: case SSH_CHANNEL_OPEN:
464: case SSH_CHANNEL_X11_OPEN:
465: return 1;
466: case SSH_CHANNEL_INPUT_DRAINING:
467: case SSH_CHANNEL_OUTPUT_DRAINING:
468: if (!compat13)
469: fatal("cannot happen: OUT_DRAIN");
470: return 1;
471: default:
472: fatal("channel_still_open: bad channel type %d", c->type);
473: /* NOTREACHED */
474: }
475: }
476: return 0;
477: }
478:
479: /* Returns the id of an open channel suitable for keepaliving */
480:
481: int
482: channel_find_open()
483: {
484: int i;
485: Channel *c;
486:
487: for (i = 0; i < channels_alloc; i++) {
488: c = channels[i];
489: if (c == NULL)
490: continue;
491: switch (c->type) {
492: case SSH_CHANNEL_CLOSED:
493: case SSH_CHANNEL_DYNAMIC:
494: case SSH_CHANNEL_X11_LISTENER:
495: case SSH_CHANNEL_PORT_LISTENER:
496: case SSH_CHANNEL_RPORT_LISTENER:
497: case SSH_CHANNEL_OPENING:
498: case SSH_CHANNEL_CONNECTING:
499: case SSH_CHANNEL_ZOMBIE:
500: continue;
501: case SSH_CHANNEL_LARVAL:
502: case SSH_CHANNEL_AUTH_SOCKET:
503: case SSH_CHANNEL_OPEN:
504: case SSH_CHANNEL_X11_OPEN:
505: return i;
506: case SSH_CHANNEL_INPUT_DRAINING:
507: case SSH_CHANNEL_OUTPUT_DRAINING:
508: if (!compat13)
509: fatal("cannot happen: OUT_DRAIN");
510: return i;
511: default:
512: fatal("channel_find_open: bad channel type %d", c->type);
513: /* NOTREACHED */
514: }
515: }
516: return -1;
517: }
518:
519:
520: /*
521: * Returns a message describing the currently open forwarded connections,
522: * suitable for sending to the client. The message contains crlf pairs for
523: * newlines.
524: */
525:
526: char *
527: channel_open_message()
528: {
529: Buffer buffer;
530: Channel *c;
531: char buf[1024], *cp;
532: int i;
533:
534: buffer_init(&buffer);
535: snprintf(buf, sizeof buf, "The following connections are open:\r\n");
536: buffer_append(&buffer, buf, strlen(buf));
537: for (i = 0; i < channels_alloc; i++) {
538: c = channels[i];
539: if (c == NULL)
540: continue;
541: switch (c->type) {
542: case SSH_CHANNEL_X11_LISTENER:
543: case SSH_CHANNEL_PORT_LISTENER:
544: case SSH_CHANNEL_RPORT_LISTENER:
545: case SSH_CHANNEL_CLOSED:
546: case SSH_CHANNEL_AUTH_SOCKET:
547: case SSH_CHANNEL_ZOMBIE:
548: continue;
549: case SSH_CHANNEL_LARVAL:
550: case SSH_CHANNEL_OPENING:
551: case SSH_CHANNEL_CONNECTING:
552: case SSH_CHANNEL_DYNAMIC:
553: case SSH_CHANNEL_OPEN:
554: case SSH_CHANNEL_X11_OPEN:
555: case SSH_CHANNEL_INPUT_DRAINING:
556: case SSH_CHANNEL_OUTPUT_DRAINING:
557: snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n",
558: c->self, c->remote_name,
559: c->type, c->remote_id,
560: c->istate, buffer_len(&c->input),
561: c->ostate, buffer_len(&c->output),
562: c->rfd, c->wfd);
563: buffer_append(&buffer, buf, strlen(buf));
564: continue;
565: default:
566: fatal("channel_open_message: bad channel type %d", c->type);
567: /* NOTREACHED */
568: }
569: }
570: buffer_append(&buffer, "\0", 1);
571: cp = xstrdup(buffer_ptr(&buffer));
572: buffer_free(&buffer);
573: return cp;
574: }
575:
576: void
577: channel_send_open(int id)
578: {
579: Channel *c = channel_lookup(id);
580: if (c == NULL) {
581: log("channel_send_open: %d: bad id", id);
582: return;
583: }
584: debug("send channel open %d", id);
585: packet_start(SSH2_MSG_CHANNEL_OPEN);
586: packet_put_cstring(c->ctype);
587: packet_put_int(c->self);
588: packet_put_int(c->local_window);
589: packet_put_int(c->local_maxpacket);
590: packet_send();
591: }
592:
593: void
594: channel_request(int id, char *service, int wantconfirm)
595: {
596: channel_request_start(id, service, wantconfirm);
597: packet_send();
598: debug("channel request %d: %s", id, service) ;
599: }
600: void
601: channel_request_start(int id, char *service, int wantconfirm)
602: {
603: Channel *c = channel_lookup(id);
604: if (c == NULL) {
605: log("channel_request: %d: bad id", id);
606: return;
607: }
608: packet_start(SSH2_MSG_CHANNEL_REQUEST);
609: packet_put_int(c->remote_id);
610: packet_put_cstring(service);
611: packet_put_char(wantconfirm);
612: }
613: void
614: channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg)
615: {
616: Channel *c = channel_lookup(id);
617: if (c == NULL) {
618: log("channel_register_callback: %d: bad id", id);
619: return;
620: }
621: c->cb_event = mtype;
622: c->cb_fn = fn;
623: c->cb_arg = arg;
624: }
625: void
626: channel_register_cleanup(int id, channel_callback_fn *fn)
627: {
628: Channel *c = channel_lookup(id);
629: if (c == NULL) {
630: log("channel_register_cleanup: %d: bad id", id);
631: return;
632: }
1.131 markus 633: c->detach_user = fn;
1.121 markus 634: }
635: void
636: channel_cancel_cleanup(int id)
637: {
638: Channel *c = channel_lookup(id);
639: if (c == NULL) {
640: log("channel_cancel_cleanup: %d: bad id", id);
641: return;
1.52 markus 642: }
1.131 markus 643: c->detach_user = NULL;
1.121 markus 644: }
645: void
646: channel_register_filter(int id, channel_filter_fn *fn)
647: {
648: Channel *c = channel_lookup(id);
649: if (c == NULL) {
650: log("channel_register_filter: %d: bad id", id);
651: return;
1.52 markus 652: }
1.121 markus 653: c->input_filter = fn;
1.52 markus 654: }
655:
1.49 markus 656: void
1.121 markus 657: channel_set_fds(int id, int rfd, int wfd, int efd,
658: int extusage, int nonblock)
1.1 deraadt 659: {
1.121 markus 660: Channel *c = channel_lookup(id);
661: if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
662: fatal("channel_activate for non-larval channel %d.", id);
663: channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
664: c->type = SSH_CHANNEL_OPEN;
665: /* XXX window size? */
666: c->local_window = c->local_window_max = c->local_maxpacket * 2;
667: packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
668: packet_put_int(c->remote_id);
669: packet_put_int(c->local_window);
670: packet_send();
1.1 deraadt 671: }
672:
1.27 markus 673: /*
1.41 markus 674: * 'channel_pre*' are called just before select() to add any bits relevant to
675: * channels in the select bitmasks.
676: */
677: /*
678: * 'channel_post*': perform any appropriate operations for channels which
679: * have events pending.
1.27 markus 680: */
1.41 markus 681: typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset);
682: chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
683: chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
684:
1.127 itojun 685: static void
1.41 markus 686: channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
687: {
688: FD_SET(c->sock, readset);
689: }
690:
1.127 itojun 691: static void
1.75 markus 692: channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset)
693: {
694: debug3("channel %d: waiting for connection", c->self);
695: FD_SET(c->sock, writeset);
696: }
697:
1.127 itojun 698: static void
1.41 markus 699: channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
700: {
701: if (buffer_len(&c->input) < packet_get_maxsize())
702: FD_SET(c->sock, readset);
703: if (buffer_len(&c->output) > 0)
704: FD_SET(c->sock, writeset);
705: }
1.1 deraadt 706:
1.127 itojun 707: static void
1.41 markus 708: channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset)
709: {
710: /* test whether sockets are 'alive' for read/write */
711: if (c->istate == CHAN_INPUT_OPEN)
712: if (buffer_len(&c->input) < packet_get_maxsize())
713: FD_SET(c->sock, readset);
714: if (c->ostate == CHAN_OUTPUT_OPEN ||
715: c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
716: if (buffer_len(&c->output) > 0) {
717: FD_SET(c->sock, writeset);
718: } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
719: chan_obuf_empty(c);
720: }
721: }
722: }
723:
1.127 itojun 724: static void
1.44 markus 725: channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset)
726: {
727: if (c->istate == CHAN_INPUT_OPEN &&
728: c->remote_window > 0 &&
729: buffer_len(&c->input) < c->remote_window)
730: FD_SET(c->rfd, readset);
731: if (c->ostate == CHAN_OUTPUT_OPEN ||
732: c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
733: if (buffer_len(&c->output) > 0) {
734: FD_SET(c->wfd, writeset);
735: } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
736: chan_obuf_empty(c);
737: }
738: }
739: /** XXX check close conditions, too */
740: if (c->efd != -1) {
741: if (c->extended_usage == CHAN_EXTENDED_WRITE &&
742: buffer_len(&c->extended) > 0)
743: FD_SET(c->efd, writeset);
744: else if (c->extended_usage == CHAN_EXTENDED_READ &&
745: buffer_len(&c->extended) < c->remote_window)
746: FD_SET(c->efd, readset);
747: }
748: }
749:
1.127 itojun 750: static void
1.41 markus 751: channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
752: {
753: if (buffer_len(&c->input) == 0) {
754: packet_start(SSH_MSG_CHANNEL_CLOSE);
755: packet_put_int(c->remote_id);
756: packet_send();
757: c->type = SSH_CHANNEL_CLOSED;
1.105 markus 758: debug("channel %d: closing after input drain.", c->self);
1.41 markus 759: }
760: }
761:
1.127 itojun 762: static void
1.41 markus 763: channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
764: {
765: if (buffer_len(&c->output) == 0)
1.113 markus 766: chan_mark_dead(c);
1.49 markus 767: else
1.41 markus 768: FD_SET(c->sock, writeset);
769: }
770:
771: /*
772: * This is a special state for X11 authentication spoofing. An opened X11
773: * connection (when authentication spoofing is being done) remains in this
774: * state until the first packet has been completely read. The authentication
775: * data in that packet is then substituted by the real data if it matches the
776: * fake data, and the channel is put into normal mode.
1.51 markus 777: * XXX All this happens at the client side.
1.121 markus 778: * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
1.41 markus 779: */
1.127 itojun 780: static int
1.121 markus 781: x11_open_helper(Buffer *b)
1.1 deraadt 782: {
1.77 markus 783: u_char *ucp;
784: u_int proto_len, data_len;
1.25 markus 785:
1.41 markus 786: /* Check if the fixed size part of the packet is in buffer. */
1.121 markus 787: if (buffer_len(b) < 12)
1.41 markus 788: return 0;
789:
790: /* Parse the lengths of variable-length fields. */
1.121 markus 791: ucp = (u_char *) buffer_ptr(b);
1.41 markus 792: if (ucp[0] == 0x42) { /* Byte order MSB first. */
793: proto_len = 256 * ucp[6] + ucp[7];
794: data_len = 256 * ucp[8] + ucp[9];
795: } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
796: proto_len = ucp[6] + 256 * ucp[7];
797: data_len = ucp[8] + 256 * ucp[9];
798: } else {
799: debug("Initial X11 packet contains bad byte order byte: 0x%x",
800: ucp[0]);
801: return -1;
802: }
803:
804: /* Check if the whole packet is in buffer. */
1.121 markus 805: if (buffer_len(b) <
1.41 markus 806: 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
807: return 0;
808:
809: /* Check if authentication protocol matches. */
810: if (proto_len != strlen(x11_saved_proto) ||
811: memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
812: debug("X11 connection uses different authentication protocol.");
813: return -1;
814: }
815: /* Check if authentication data matches our fake data. */
816: if (data_len != x11_fake_data_len ||
817: memcmp(ucp + 12 + ((proto_len + 3) & ~3),
818: x11_fake_data, x11_fake_data_len) != 0) {
819: debug("X11 auth data does not match fake data.");
820: return -1;
821: }
822: /* Check fake data length */
823: if (x11_fake_data_len != x11_saved_data_len) {
824: error("X11 fake_data_len %d != saved_data_len %d",
825: x11_fake_data_len, x11_saved_data_len);
826: return -1;
827: }
828: /*
829: * Received authentication protocol and data match
830: * our fake data. Substitute the fake data with real
831: * data.
832: */
833: memcpy(ucp + 12 + ((proto_len + 3) & ~3),
834: x11_saved_data, x11_saved_data_len);
835: return 1;
836: }
837:
1.127 itojun 838: static void
1.41 markus 839: channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
840: {
1.121 markus 841: int ret = x11_open_helper(&c->output);
1.41 markus 842: if (ret == 1) {
843: /* Start normal processing for the channel. */
844: c->type = SSH_CHANNEL_OPEN;
1.47 markus 845: channel_pre_open_13(c, readset, writeset);
1.41 markus 846: } else if (ret == -1) {
847: /*
848: * We have received an X11 connection that has bad
849: * authentication information.
850: */
1.98 millert 851: log("X11 connection rejected because of wrong authentication.");
1.41 markus 852: buffer_clear(&c->input);
853: buffer_clear(&c->output);
1.132 markus 854: channel_close_fd(&c->sock);
1.41 markus 855: c->sock = -1;
856: c->type = SSH_CHANNEL_CLOSED;
857: packet_start(SSH_MSG_CHANNEL_CLOSE);
858: packet_put_int(c->remote_id);
859: packet_send();
860: }
861: }
1.25 markus 862:
1.127 itojun 863: static void
1.51 markus 864: channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
1.41 markus 865: {
1.121 markus 866: int ret = x11_open_helper(&c->output);
1.133 markus 867:
868: /* c->force_drain = 1; */
869:
1.41 markus 870: if (ret == 1) {
871: c->type = SSH_CHANNEL_OPEN;
1.57 markus 872: if (compat20)
873: channel_pre_open_20(c, readset, writeset);
874: else
875: channel_pre_open_15(c, readset, writeset);
1.41 markus 876: } else if (ret == -1) {
877: debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
1.51 markus 878: chan_read_failed(c); /** force close? */
1.41 markus 879: chan_write_failed(c);
880: debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
881: }
882: }
1.25 markus 883:
1.104 markus 884: /* try to decode a socks4 header */
1.127 itojun 885: static int
1.104 markus 886: channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
1.103 markus 887: {
888: u_char *p, *host;
1.109 markus 889: int len, have, i, found;
1.104 markus 890: char username[256];
1.103 markus 891: struct {
892: u_int8_t version;
893: u_int8_t command;
894: u_int16_t dest_port;
1.104 markus 895: struct in_addr dest_addr;
1.103 markus 896: } s4_req, s4_rsp;
897:
1.104 markus 898: debug2("channel %d: decode socks4", c->self);
1.109 markus 899:
900: have = buffer_len(&c->input);
901: len = sizeof(s4_req);
902: if (have < len)
903: return 0;
904: p = buffer_ptr(&c->input);
905: for (found = 0, i = len; i < have; i++) {
906: if (p[i] == '\0') {
907: found = 1;
908: break;
909: }
910: if (i > 1024) {
911: /* the peer is probably sending garbage */
912: debug("channel %d: decode socks4: too long",
913: c->self);
914: return -1;
915: }
916: }
917: if (!found)
918: return 0;
1.103 markus 919: buffer_get(&c->input, (char *)&s4_req.version, 1);
920: buffer_get(&c->input, (char *)&s4_req.command, 1);
921: buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
1.104 markus 922: buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
1.109 markus 923: have = buffer_len(&c->input);
1.103 markus 924: p = buffer_ptr(&c->input);
925: len = strlen(p);
1.106 markus 926: debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
1.103 markus 927: if (len > have)
1.104 markus 928: fatal("channel %d: decode socks4: len %d > have %d",
1.103 markus 929: c->self, len, have);
930: strlcpy(username, p, sizeof(username));
931: buffer_consume(&c->input, len);
932: buffer_consume(&c->input, 1); /* trailing '\0' */
933:
1.104 markus 934: host = inet_ntoa(s4_req.dest_addr);
1.103 markus 935: strlcpy(c->path, host, sizeof(c->path));
936: c->host_port = ntohs(s4_req.dest_port);
937:
1.106 markus 938: debug("channel %d: dynamic request: socks4 host %s port %u command %u",
939: c->self, host, c->host_port, s4_req.command);
1.103 markus 940:
1.104 markus 941: if (s4_req.command != 1) {
942: debug("channel %d: cannot handle: socks4 cn %d",
943: c->self, s4_req.command);
944: return -1;
1.103 markus 945: }
1.104 markus 946: s4_rsp.version = 0; /* vn: 0 for reply */
947: s4_rsp.command = 90; /* cd: req granted */
1.103 markus 948: s4_rsp.dest_port = 0; /* ignored */
1.104 markus 949: s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
1.103 markus 950: buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp));
1.104 markus 951: return 1;
952: }
953:
954: /* dynamic port forwarding */
1.127 itojun 955: static void
1.104 markus 956: channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
957: {
958: u_char *p;
959: int have, ret;
1.103 markus 960:
1.104 markus 961: have = buffer_len(&c->input);
1.137 markus 962: c->delayed = 0;
1.104 markus 963: debug2("channel %d: pre_dynamic: have %d", c->self, have);
1.105 markus 964: /* buffer_dump(&c->input); */
1.104 markus 965: /* check if the fixed size part of the packet is in buffer. */
966: if (have < 4) {
967: /* need more */
968: FD_SET(c->sock, readset);
969: return;
970: }
971: /* try to guess the protocol */
972: p = buffer_ptr(&c->input);
973: switch (p[0]) {
974: case 0x04:
975: ret = channel_decode_socks4(c, readset, writeset);
976: break;
977: default:
978: ret = -1;
979: break;
980: }
981: if (ret < 0) {
1.113 markus 982: chan_mark_dead(c);
1.104 markus 983: } else if (ret == 0) {
984: debug2("channel %d: pre_dynamic: need more", c->self);
985: /* need more */
986: FD_SET(c->sock, readset);
987: } else {
988: /* switch to the next state */
989: c->type = SSH_CHANNEL_OPENING;
990: port_open_helper(c, "direct-tcpip");
991: }
1.103 markus 992: }
993:
1.41 markus 994: /* This is our fake X11 server socket. */
1.127 itojun 995: static void
1.41 markus 996: channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
997: {
1.113 markus 998: Channel *nc;
1.41 markus 999: struct sockaddr addr;
1.113 markus 1000: int newsock;
1.41 markus 1001: socklen_t addrlen;
1.85 markus 1002: char buf[16384], *remote_ipaddr;
1.51 markus 1003: int remote_port;
1.25 markus 1004:
1.41 markus 1005: if (FD_ISSET(c->sock, readset)) {
1006: debug("X11 connection requested.");
1007: addrlen = sizeof(addr);
1008: newsock = accept(c->sock, &addr, &addrlen);
1009: if (newsock < 0) {
1010: error("accept: %.100s", strerror(errno));
1011: return;
1012: }
1.85 markus 1013: remote_ipaddr = get_peer_ipaddr(newsock);
1.51 markus 1014: remote_port = get_peer_port(newsock);
1.41 markus 1015: snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
1.85 markus 1016: remote_ipaddr, remote_port);
1.51 markus 1017:
1.113 markus 1018: nc = channel_new("accepted x11 socket",
1.51 markus 1019: SSH_CHANNEL_OPENING, newsock, newsock, -1,
1020: c->local_window_max, c->local_maxpacket,
1.71 markus 1021: 0, xstrdup(buf), 1);
1.113 markus 1022: if (nc == NULL) {
1023: close(newsock);
1024: xfree(remote_ipaddr);
1025: return;
1026: }
1.51 markus 1027: if (compat20) {
1028: packet_start(SSH2_MSG_CHANNEL_OPEN);
1029: packet_put_cstring("x11");
1.113 markus 1030: packet_put_int(nc->self);
1.51 markus 1031: packet_put_int(c->local_window_max);
1032: packet_put_int(c->local_maxpacket);
1.85 markus 1033: /* originator ipaddr and port */
1034: packet_put_cstring(remote_ipaddr);
1.57 markus 1035: if (datafellows & SSH_BUG_X11FWD) {
1036: debug("ssh2 x11 bug compat mode");
1037: } else {
1038: packet_put_int(remote_port);
1039: }
1.51 markus 1040: packet_send();
1041: } else {
1042: packet_start(SSH_SMSG_X11_OPEN);
1.113 markus 1043: packet_put_int(nc->self);
1.121 markus 1044: if (packet_get_protocol_flags() &
1045: SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
1.125 markus 1046: packet_put_cstring(buf);
1.51 markus 1047: packet_send();
1048: }
1.85 markus 1049: xfree(remote_ipaddr);
1.41 markus 1050: }
1051: }
1.25 markus 1052:
1.127 itojun 1053: static void
1.103 markus 1054: port_open_helper(Channel *c, char *rtype)
1055: {
1056: int direct;
1057: char buf[1024];
1058: char *remote_ipaddr = get_peer_ipaddr(c->sock);
1059: u_short remote_port = get_peer_port(c->sock);
1060:
1061: direct = (strcmp(rtype, "direct-tcpip") == 0);
1062:
1063: snprintf(buf, sizeof buf,
1064: "%s: listening port %d for %.100s port %d, "
1065: "connect from %.200s port %d",
1066: rtype, c->listening_port, c->path, c->host_port,
1067: remote_ipaddr, remote_port);
1068:
1069: xfree(c->remote_name);
1070: c->remote_name = xstrdup(buf);
1071:
1072: if (compat20) {
1073: packet_start(SSH2_MSG_CHANNEL_OPEN);
1074: packet_put_cstring(rtype);
1075: packet_put_int(c->self);
1076: packet_put_int(c->local_window_max);
1077: packet_put_int(c->local_maxpacket);
1078: if (direct) {
1079: /* target host, port */
1080: packet_put_cstring(c->path);
1081: packet_put_int(c->host_port);
1082: } else {
1083: /* listen address, port */
1084: packet_put_cstring(c->path);
1085: packet_put_int(c->listening_port);
1086: }
1087: /* originator host and port */
1088: packet_put_cstring(remote_ipaddr);
1089: packet_put_int(remote_port);
1090: packet_send();
1091: } else {
1092: packet_start(SSH_MSG_PORT_OPEN);
1093: packet_put_int(c->self);
1094: packet_put_cstring(c->path);
1095: packet_put_int(c->host_port);
1.121 markus 1096: if (packet_get_protocol_flags() &
1097: SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
1.103 markus 1098: packet_put_cstring(c->remote_name);
1099: packet_send();
1100: }
1101: xfree(remote_ipaddr);
1102: }
1103:
1.41 markus 1104: /*
1105: * This socket is listening for connections to a forwarded TCP/IP port.
1106: */
1.127 itojun 1107: static void
1.41 markus 1108: channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
1109: {
1.103 markus 1110: Channel *nc;
1.41 markus 1111: struct sockaddr addr;
1.113 markus 1112: int newsock, nextstate;
1.41 markus 1113: socklen_t addrlen;
1.103 markus 1114: char *rtype;
1.73 markus 1115:
1.41 markus 1116: if (FD_ISSET(c->sock, readset)) {
1117: debug("Connection to port %d forwarding "
1118: "to %.100s port %d requested.",
1119: c->listening_port, c->path, c->host_port);
1.103 markus 1120:
1.137 markus 1121: if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1122: nextstate = SSH_CHANNEL_OPENING;
1123: rtype = "forwarded-tcpip";
1124: } else {
1125: if (c->host_port == 0) {
1126: nextstate = SSH_CHANNEL_DYNAMIC;
1.138 markus 1127: rtype = "dynamic-tcpip";
1.137 markus 1128: } else {
1129: nextstate = SSH_CHANNEL_OPENING;
1130: rtype = "direct-tcpip";
1131: }
1132: }
1.103 markus 1133:
1.41 markus 1134: addrlen = sizeof(addr);
1135: newsock = accept(c->sock, &addr, &addrlen);
1136: if (newsock < 0) {
1137: error("accept: %.100s", strerror(errno));
1138: return;
1139: }
1.113 markus 1140: nc = channel_new(rtype,
1.103 markus 1141: nextstate, newsock, newsock, -1,
1.41 markus 1142: c->local_window_max, c->local_maxpacket,
1.103 markus 1143: 0, xstrdup(rtype), 1);
1144: if (nc == NULL) {
1.113 markus 1145: error("channel_post_port_listener: no new channel:");
1146: close(newsock);
1.103 markus 1147: return;
1.41 markus 1148: }
1.103 markus 1149: nc->listening_port = c->listening_port;
1150: nc->host_port = c->host_port;
1151: strlcpy(nc->path, c->path, sizeof(nc->path));
1152:
1.137 markus 1153: if (nextstate == SSH_CHANNEL_DYNAMIC) {
1154: /*
1155: * do not call the channel_post handler until
1156: * this flag has been reset by a pre-handler.
1157: * otherwise the FD_ISSET calls might overflow
1158: */
1159: nc->delayed = 1;
1160: } else {
1.103 markus 1161: port_open_helper(nc, rtype);
1.137 markus 1162: }
1.41 markus 1163: }
1164: }
1.25 markus 1165:
1.41 markus 1166: /*
1167: * This is the authentication agent socket listening for connections from
1168: * clients.
1169: */
1.127 itojun 1170: static void
1.41 markus 1171: channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
1172: {
1.113 markus 1173: Channel *nc;
1.121 markus 1174: char *name;
1.113 markus 1175: int newsock;
1.41 markus 1176: struct sockaddr addr;
1177: socklen_t addrlen;
1.25 markus 1178:
1.41 markus 1179: if (FD_ISSET(c->sock, readset)) {
1180: addrlen = sizeof(addr);
1181: newsock = accept(c->sock, &addr, &addrlen);
1182: if (newsock < 0) {
1183: error("accept from auth socket: %.100s", strerror(errno));
1184: return;
1185: }
1.121 markus 1186: name = xstrdup("accepted auth socket");
1.113 markus 1187: nc = channel_new("accepted auth socket",
1.73 markus 1188: SSH_CHANNEL_OPENING, newsock, newsock, -1,
1189: c->local_window_max, c->local_maxpacket,
1.121 markus 1190: 0, name, 1);
1.113 markus 1191: if (nc == NULL) {
1192: error("channel_post_auth_listener: channel_new failed");
1.121 markus 1193: xfree(name);
1.113 markus 1194: close(newsock);
1195: }
1.73 markus 1196: if (compat20) {
1197: packet_start(SSH2_MSG_CHANNEL_OPEN);
1198: packet_put_cstring("auth-agent@openssh.com");
1.113 markus 1199: packet_put_int(nc->self);
1.73 markus 1200: packet_put_int(c->local_window_max);
1201: packet_put_int(c->local_maxpacket);
1202: } else {
1203: packet_start(SSH_SMSG_AGENT_OPEN);
1.113 markus 1204: packet_put_int(nc->self);
1.73 markus 1205: }
1.41 markus 1206: packet_send();
1207: }
1208: }
1.25 markus 1209:
1.127 itojun 1210: static void
1.75 markus 1211: channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
1212: {
1.114 markus 1213: int err = 0;
1.129 stevesk 1214: socklen_t sz = sizeof(err);
1.114 markus 1215:
1.75 markus 1216: if (FD_ISSET(c->sock, writeset)) {
1.114 markus 1217: if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err,
1218: &sz) < 0) {
1219: err = errno;
1220: error("getsockopt SO_ERROR failed");
1221: }
1222: if (err == 0) {
1223: debug("channel %d: connected", c->self);
1224: c->type = SSH_CHANNEL_OPEN;
1225: if (compat20) {
1226: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1227: packet_put_int(c->remote_id);
1228: packet_put_int(c->self);
1229: packet_put_int(c->local_window);
1230: packet_put_int(c->local_maxpacket);
1231: } else {
1232: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1233: packet_put_int(c->remote_id);
1234: packet_put_int(c->self);
1235: }
1.75 markus 1236: } else {
1.114 markus 1237: debug("channel %d: not connected: %s",
1238: c->self, strerror(err));
1239: if (compat20) {
1240: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1241: packet_put_int(c->remote_id);
1242: packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1243: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1244: packet_put_cstring(strerror(err));
1245: packet_put_cstring("");
1246: }
1.75 markus 1247: } else {
1.114 markus 1248: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1249: packet_put_int(c->remote_id);
1.75 markus 1250: }
1.114 markus 1251: chan_mark_dead(c);
1.75 markus 1252: }
1.114 markus 1253: packet_send();
1.75 markus 1254: }
1255: }
1256:
1.127 itojun 1257: static int
1.41 markus 1258: channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
1259: {
1260: char buf[16*1024];
1261: int len;
1.25 markus 1262:
1.118 markus 1263: if (c->rfd != -1 &&
1.41 markus 1264: FD_ISSET(c->rfd, readset)) {
1265: len = read(c->rfd, buf, sizeof(buf));
1.53 markus 1266: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1267: return 1;
1.41 markus 1268: if (len <= 0) {
1.51 markus 1269: debug("channel %d: read<=0 rfd %d len %d",
1.41 markus 1270: c->self, c->rfd, len);
1.104 markus 1271: if (c->type != SSH_CHANNEL_OPEN) {
1272: debug("channel %d: not open", c->self);
1.113 markus 1273: chan_mark_dead(c);
1.103 markus 1274: return -1;
1.104 markus 1275: } else if (compat13) {
1.41 markus 1276: buffer_consume(&c->output, buffer_len(&c->output));
1277: c->type = SSH_CHANNEL_INPUT_DRAINING;
1.121 markus 1278: debug("channel %d: input draining.", c->self);
1.25 markus 1279: } else {
1.41 markus 1280: chan_read_failed(c);
1.25 markus 1281: }
1.41 markus 1282: return -1;
1283: }
1.65 markus 1284: if(c->input_filter != NULL) {
1.66 markus 1285: if (c->input_filter(c, buf, len) == -1) {
1.105 markus 1286: debug("channel %d: filter stops", c->self);
1.65 markus 1287: chan_read_failed(c);
1288: }
1289: } else {
1290: buffer_append(&c->input, buf, len);
1291: }
1.41 markus 1292: }
1293: return 1;
1294: }
1.127 itojun 1295: static int
1.41 markus 1296: channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
1297: {
1.95 markus 1298: struct termios tio;
1.134 markus 1299: u_char *data;
1300: u_int dlen;
1.41 markus 1301: int len;
1.25 markus 1302:
1.41 markus 1303: /* Send buffered output data to the socket. */
1.118 markus 1304: if (c->wfd != -1 &&
1.41 markus 1305: FD_ISSET(c->wfd, writeset) &&
1306: buffer_len(&c->output) > 0) {
1.134 markus 1307: data = buffer_ptr(&c->output);
1308: dlen = buffer_len(&c->output);
1309: len = write(c->wfd, data, dlen);
1.53 markus 1310: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1311: return 1;
1.41 markus 1312: if (len <= 0) {
1.104 markus 1313: if (c->type != SSH_CHANNEL_OPEN) {
1314: debug("channel %d: not open", c->self);
1.113 markus 1315: chan_mark_dead(c);
1.104 markus 1316: return -1;
1317: } else if (compat13) {
1.41 markus 1318: buffer_consume(&c->output, buffer_len(&c->output));
1.121 markus 1319: debug("channel %d: input draining.", c->self);
1.41 markus 1320: c->type = SSH_CHANNEL_INPUT_DRAINING;
1321: } else {
1322: chan_write_failed(c);
1323: }
1324: return -1;
1.91 markus 1325: }
1.134 markus 1326: if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') {
1.91 markus 1327: if (tcgetattr(c->wfd, &tio) == 0 &&
1328: !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1329: /*
1330: * Simulate echo to reduce the impact of
1.96 markus 1331: * traffic analysis. We need to match the
1.95 markus 1332: * size of a SSH2_MSG_CHANNEL_DATA message
1333: * (4 byte channel id + data)
1.91 markus 1334: */
1.95 markus 1335: packet_send_ignore(4 + len);
1.91 markus 1336: packet_send();
1337: }
1.25 markus 1338: }
1.41 markus 1339: buffer_consume(&c->output, len);
1.44 markus 1340: if (compat20 && len > 0) {
1341: c->local_consumed += len;
1342: }
1343: }
1344: return 1;
1345: }
1.127 itojun 1346: static int
1.44 markus 1347: channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
1348: {
1349: char buf[16*1024];
1350: int len;
1351:
1.45 markus 1352: /** XXX handle drain efd, too */
1.44 markus 1353: if (c->efd != -1) {
1354: if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1355: FD_ISSET(c->efd, writeset) &&
1356: buffer_len(&c->extended) > 0) {
1357: len = write(c->efd, buffer_ptr(&c->extended),
1358: buffer_len(&c->extended));
1.70 markus 1359: debug2("channel %d: written %d to efd %d",
1.44 markus 1360: c->self, len, c->efd);
1.93 markus 1361: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1362: return 1;
1363: if (len <= 0) {
1364: debug2("channel %d: closing write-efd %d",
1365: c->self, c->efd);
1.132 markus 1366: channel_close_fd(&c->efd);
1.93 markus 1367: } else {
1.44 markus 1368: buffer_consume(&c->extended, len);
1369: c->local_consumed += len;
1370: }
1371: } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1372: FD_ISSET(c->efd, readset)) {
1373: len = read(c->efd, buf, sizeof(buf));
1.70 markus 1374: debug2("channel %d: read %d from efd %d",
1.44 markus 1375: c->self, len, c->efd);
1.93 markus 1376: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1377: return 1;
1378: if (len <= 0) {
1379: debug2("channel %d: closing read-efd %d",
1.45 markus 1380: c->self, c->efd);
1.132 markus 1381: channel_close_fd(&c->efd);
1.93 markus 1382: } else {
1.44 markus 1383: buffer_append(&c->extended, buf, len);
1.93 markus 1384: }
1.44 markus 1385: }
1386: }
1387: return 1;
1388: }
1.127 itojun 1389: static int
1.93 markus 1390: channel_check_window(Channel *c)
1.44 markus 1391: {
1.104 markus 1392: if (c->type == SSH_CHANNEL_OPEN &&
1393: !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
1.44 markus 1394: c->local_window < c->local_window_max/2 &&
1395: c->local_consumed > 0) {
1396: packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1397: packet_put_int(c->remote_id);
1398: packet_put_int(c->local_consumed);
1399: packet_send();
1.70 markus 1400: debug2("channel %d: window %d sent adjust %d",
1.44 markus 1401: c->self, c->local_window,
1402: c->local_consumed);
1403: c->local_window += c->local_consumed;
1404: c->local_consumed = 0;
1.1 deraadt 1405: }
1.41 markus 1406: return 1;
1.1 deraadt 1407: }
1408:
1.127 itojun 1409: static void
1.41 markus 1410: channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset)
1411: {
1.137 markus 1412: if (c->delayed)
1413: return;
1.41 markus 1414: channel_handle_rfd(c, readset, writeset);
1415: channel_handle_wfd(c, readset, writeset);
1416: }
1.1 deraadt 1417:
1.127 itojun 1418: static void
1.44 markus 1419: channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset)
1420: {
1.137 markus 1421: if (c->delayed)
1422: return;
1.44 markus 1423: channel_handle_rfd(c, readset, writeset);
1424: channel_handle_wfd(c, readset, writeset);
1425: channel_handle_efd(c, readset, writeset);
1.93 markus 1426:
1427: channel_check_window(c);
1.44 markus 1428: }
1429:
1.127 itojun 1430: static void
1.41 markus 1431: channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
1.1 deraadt 1432: {
1.41 markus 1433: int len;
1434: /* Send buffered output data to the socket. */
1435: if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1436: len = write(c->sock, buffer_ptr(&c->output),
1437: buffer_len(&c->output));
1438: if (len <= 0)
1439: buffer_consume(&c->output, buffer_len(&c->output));
1440: else
1441: buffer_consume(&c->output, len);
1442: }
1443: }
1.25 markus 1444:
1.127 itojun 1445: static void
1.44 markus 1446: channel_handler_init_20(void)
1447: {
1448: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20;
1.51 markus 1449: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
1.44 markus 1450: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1.73 markus 1451: channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
1.51 markus 1452: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1.73 markus 1453: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1.75 markus 1454: channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
1.103 markus 1455: channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.44 markus 1456:
1457: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2;
1458: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1.73 markus 1459: channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
1.51 markus 1460: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1.73 markus 1461: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1.75 markus 1462: channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
1.104 markus 1463: channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_2;
1.44 markus 1464: }
1465:
1.127 itojun 1466: static void
1.41 markus 1467: channel_handler_init_13(void)
1468: {
1469: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1470: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1471: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1472: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1473: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1474: channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1475: channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
1.75 markus 1476: channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
1.103 markus 1477: channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.25 markus 1478:
1.41 markus 1479: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
1480: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1481: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1482: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1483: channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
1.75 markus 1484: channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
1.104 markus 1485: channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1;
1.41 markus 1486: }
1.25 markus 1487:
1.127 itojun 1488: static void
1.41 markus 1489: channel_handler_init_15(void)
1490: {
1491: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15;
1.51 markus 1492: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
1.41 markus 1493: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1494: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1495: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1.75 markus 1496: channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
1.103 markus 1497: channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.25 markus 1498:
1.41 markus 1499: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1500: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1501: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1502: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
1.75 markus 1503: channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
1.104 markus 1504: channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1;
1.41 markus 1505: }
1.27 markus 1506:
1.127 itojun 1507: static void
1.41 markus 1508: channel_handler_init(void)
1509: {
1510: int i;
1511: for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
1512: channel_pre[i] = NULL;
1513: channel_post[i] = NULL;
1514: }
1.44 markus 1515: if (compat20)
1516: channel_handler_init_20();
1517: else if (compat13)
1.41 markus 1518: channel_handler_init_13();
1519: else
1520: channel_handler_init_15();
1521: }
1.25 markus 1522:
1.127 itojun 1523: static void
1.41 markus 1524: channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
1525: {
1526: static int did_init = 0;
1527: int i;
1528: Channel *c;
1.25 markus 1529:
1.41 markus 1530: if (!did_init) {
1531: channel_handler_init();
1532: did_init = 1;
1533: }
1534: for (i = 0; i < channels_alloc; i++) {
1.113 markus 1535: c = channels[i];
1536: if (c == NULL)
1.41 markus 1537: continue;
1.118 markus 1538: if (ftab[c->type] != NULL)
1539: (*ftab[c->type])(c, readset, writeset);
1.93 markus 1540: if (chan_is_dead(c)) {
1541: /*
1542: * we have to remove the fd's from the select mask
1543: * before the channels are free'd and the fd's are
1544: * closed
1545: */
1546: if (c->wfd != -1)
1547: FD_CLR(c->wfd, writeset);
1548: if (c->rfd != -1)
1549: FD_CLR(c->rfd, readset);
1550: if (c->efd != -1) {
1551: if (c->extended_usage == CHAN_EXTENDED_READ)
1552: FD_CLR(c->efd, readset);
1553: if (c->extended_usage == CHAN_EXTENDED_WRITE)
1554: FD_CLR(c->efd, writeset);
1555: }
1.113 markus 1556: channel_free(c);
1.93 markus 1557: }
1.1 deraadt 1558: }
1559: }
1560:
1.121 markus 1561: /*
1562: * Allocate/update select bitmasks and add any bits relevant to channels in
1563: * select bitmasks.
1564: */
1.49 markus 1565: void
1.100 markus 1566: channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
1.132 markus 1567: int *nallocp, int rekeying)
1.41 markus 1568: {
1.84 markus 1569: int n;
1570: u_int sz;
1571:
1572: n = MAX(*maxfdp, channel_max_fd);
1573:
1574: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.132 markus 1575: /* perhaps check sz < nalloc/2 and shrink? */
1576: if (*readsetp == NULL || sz > *nallocp) {
1577: *readsetp = xrealloc(*readsetp, sz);
1578: *writesetp = xrealloc(*writesetp, sz);
1579: *nallocp = sz;
1.84 markus 1580: }
1.132 markus 1581: *maxfdp = n;
1.84 markus 1582: memset(*readsetp, 0, sz);
1583: memset(*writesetp, 0, sz);
1584:
1.100 markus 1585: if (!rekeying)
1586: channel_handler(channel_pre, *readsetp, *writesetp);
1.41 markus 1587: }
1588:
1.121 markus 1589: /*
1590: * After select, perform any appropriate operations for channels which have
1591: * events pending.
1592: */
1.49 markus 1593: void
1.41 markus 1594: channel_after_select(fd_set * readset, fd_set * writeset)
1595: {
1596: channel_handler(channel_post, readset, writeset);
1597: }
1598:
1.121 markus 1599:
1.84 markus 1600: /* If there is data to send to the connection, enqueue some of it now. */
1.1 deraadt 1601:
1.49 markus 1602: void
1.25 markus 1603: channel_output_poll()
1.1 deraadt 1604: {
1.25 markus 1605: int len, i;
1.41 markus 1606: Channel *c;
1.1 deraadt 1607:
1.25 markus 1608: for (i = 0; i < channels_alloc; i++) {
1.113 markus 1609: c = channels[i];
1610: if (c == NULL)
1611: continue;
1.37 markus 1612:
1.121 markus 1613: /*
1614: * We are only interested in channels that can have buffered
1615: * incoming data.
1616: */
1.37 markus 1617: if (compat13) {
1.41 markus 1618: if (c->type != SSH_CHANNEL_OPEN &&
1619: c->type != SSH_CHANNEL_INPUT_DRAINING)
1.37 markus 1620: continue;
1621: } else {
1.41 markus 1622: if (c->type != SSH_CHANNEL_OPEN)
1.37 markus 1623: continue;
1624: }
1.46 markus 1625: if (compat20 &&
1626: (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
1.93 markus 1627: /* XXX is this true? */
1.97 markus 1628: debug2("channel %d: no data after CLOSE", c->self);
1.44 markus 1629: continue;
1630: }
1.25 markus 1631:
1632: /* Get the amount of buffered data for this channel. */
1.93 markus 1633: if ((c->istate == CHAN_INPUT_OPEN ||
1634: c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1635: (len = buffer_len(&c->input)) > 0) {
1.121 markus 1636: /*
1637: * Send some data for the other side over the secure
1638: * connection.
1639: */
1.44 markus 1640: if (compat20) {
1641: if (len > c->remote_window)
1642: len = c->remote_window;
1643: if (len > c->remote_maxpacket)
1644: len = c->remote_maxpacket;
1.25 markus 1645: } else {
1.44 markus 1646: if (packet_is_interactive()) {
1647: if (len > 1024)
1648: len = 512;
1649: } else {
1650: /* Keep the packets at reasonable size. */
1651: if (len > packet_get_maxsize()/2)
1652: len = packet_get_maxsize()/2;
1653: }
1.25 markus 1654: }
1.41 markus 1655: if (len > 0) {
1.44 markus 1656: packet_start(compat20 ?
1657: SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
1.41 markus 1658: packet_put_int(c->remote_id);
1659: packet_put_string(buffer_ptr(&c->input), len);
1660: packet_send();
1661: buffer_consume(&c->input, len);
1662: c->remote_window -= len;
1663: }
1664: } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
1.25 markus 1665: if (compat13)
1666: fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
1.27 markus 1667: /*
1668: * input-buffer is empty and read-socket shutdown:
1669: * tell peer, that we will not send more data: send IEOF
1670: */
1.41 markus 1671: chan_ibuf_empty(c);
1.25 markus 1672: }
1.44 markus 1673: /* Send extended data, i.e. stderr */
1674: if (compat20 &&
1675: c->remote_window > 0 &&
1676: (len = buffer_len(&c->extended)) > 0 &&
1677: c->extended_usage == CHAN_EXTENDED_READ) {
1.93 markus 1678: debug2("channel %d: rwin %d elen %d euse %d",
1679: c->self, c->remote_window, buffer_len(&c->extended),
1680: c->extended_usage);
1.44 markus 1681: if (len > c->remote_window)
1682: len = c->remote_window;
1683: if (len > c->remote_maxpacket)
1684: len = c->remote_maxpacket;
1685: packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1686: packet_put_int(c->remote_id);
1687: packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1688: packet_put_string(buffer_ptr(&c->extended), len);
1689: packet_send();
1690: buffer_consume(&c->extended, len);
1691: c->remote_window -= len;
1.93 markus 1692: debug2("channel %d: sent ext data %d", c->self, len);
1.44 markus 1693: }
1.25 markus 1694: }
1.1 deraadt 1695: }
1696:
1.121 markus 1697:
1698: /* -- protocol input */
1.1 deraadt 1699:
1.49 markus 1700: void
1.69 markus 1701: channel_input_data(int type, int plen, void *ctxt)
1.1 deraadt 1702: {
1.37 markus 1703: int id;
1.25 markus 1704: char *data;
1.77 markus 1705: u_int data_len;
1.41 markus 1706: Channel *c;
1.25 markus 1707:
1708: /* Get the channel number and verify it. */
1.37 markus 1709: id = packet_get_int();
1.41 markus 1710: c = channel_lookup(id);
1711: if (c == NULL)
1.37 markus 1712: packet_disconnect("Received data for nonexistent channel %d.", id);
1.25 markus 1713:
1714: /* Ignore any data for non-open channels (might happen on close) */
1.41 markus 1715: if (c->type != SSH_CHANNEL_OPEN &&
1716: c->type != SSH_CHANNEL_X11_OPEN)
1.37 markus 1717: return;
1718:
1719: /* same for protocol 1.5 if output end is no longer open */
1.41 markus 1720: if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN)
1.25 markus 1721: return;
1722:
1723: /* Get the data. */
1724: data = packet_get_string(&data_len);
1.48 markus 1725: packet_done();
1.41 markus 1726:
1.44 markus 1727: if (compat20){
1728: if (data_len > c->local_maxpacket) {
1729: log("channel %d: rcvd big packet %d, maxpack %d",
1730: c->self, data_len, c->local_maxpacket);
1731: }
1732: if (data_len > c->local_window) {
1733: log("channel %d: rcvd too much data %d, win %d",
1734: c->self, data_len, c->local_window);
1735: xfree(data);
1736: return;
1737: }
1738: c->local_window -= data_len;
1739: }else{
1740: packet_integrity_check(plen, 4 + 4 + data_len, type);
1741: }
1.41 markus 1742: buffer_append(&c->output, data, data_len);
1.25 markus 1743: xfree(data);
1.1 deraadt 1744: }
1.121 markus 1745:
1.49 markus 1746: void
1.69 markus 1747: channel_input_extended_data(int type, int plen, void *ctxt)
1.44 markus 1748: {
1749: int id;
1750: int tcode;
1751: char *data;
1.77 markus 1752: u_int data_len;
1.44 markus 1753: Channel *c;
1754:
1755: /* Get the channel number and verify it. */
1756: id = packet_get_int();
1757: c = channel_lookup(id);
1758:
1759: if (c == NULL)
1760: packet_disconnect("Received extended_data for bad channel %d.", id);
1761: if (c->type != SSH_CHANNEL_OPEN) {
1762: log("channel %d: ext data for non open", id);
1763: return;
1764: }
1765: tcode = packet_get_int();
1766: if (c->efd == -1 ||
1767: c->extended_usage != CHAN_EXTENDED_WRITE ||
1768: tcode != SSH2_EXTENDED_DATA_STDERR) {
1769: log("channel %d: bad ext data", c->self);
1770: return;
1771: }
1772: data = packet_get_string(&data_len);
1.48 markus 1773: packet_done();
1.44 markus 1774: if (data_len > c->local_window) {
1775: log("channel %d: rcvd too much extended_data %d, win %d",
1776: c->self, data_len, c->local_window);
1777: xfree(data);
1778: return;
1779: }
1.70 markus 1780: debug2("channel %d: rcvd ext data %d", c->self, data_len);
1.44 markus 1781: c->local_window -= data_len;
1782: buffer_append(&c->extended, data, data_len);
1783: xfree(data);
1784: }
1785:
1.49 markus 1786: void
1.69 markus 1787: channel_input_ieof(int type, int plen, void *ctxt)
1.41 markus 1788: {
1789: int id;
1790: Channel *c;
1791:
1792: packet_integrity_check(plen, 4, type);
1793:
1794: id = packet_get_int();
1795: c = channel_lookup(id);
1796: if (c == NULL)
1797: packet_disconnect("Received ieof for nonexistent channel %d.", id);
1798: chan_rcvd_ieof(c);
1.133 markus 1799:
1800: /* XXX force input close */
1801: if (c->force_drain) {
1802: debug("channel %d: FORCE input drain", c->self);
1803: c->istate = CHAN_INPUT_WAIT_DRAIN;
1804: }
1805:
1.41 markus 1806: }
1.1 deraadt 1807:
1.49 markus 1808: void
1.69 markus 1809: channel_input_close(int type, int plen, void *ctxt)
1.1 deraadt 1810: {
1.41 markus 1811: int id;
1812: Channel *c;
1.1 deraadt 1813:
1.41 markus 1814: packet_integrity_check(plen, 4, type);
1815:
1816: id = packet_get_int();
1817: c = channel_lookup(id);
1818: if (c == NULL)
1819: packet_disconnect("Received close for nonexistent channel %d.", id);
1.27 markus 1820:
1821: /*
1822: * Send a confirmation that we have closed the channel and no more
1823: * data is coming for it.
1824: */
1.25 markus 1825: packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
1.41 markus 1826: packet_put_int(c->remote_id);
1.25 markus 1827: packet_send();
1828:
1.27 markus 1829: /*
1830: * If the channel is in closed state, we have sent a close request,
1831: * and the other side will eventually respond with a confirmation.
1832: * Thus, we cannot free the channel here, because then there would be
1833: * no-one to receive the confirmation. The channel gets freed when
1834: * the confirmation arrives.
1835: */
1.41 markus 1836: if (c->type != SSH_CHANNEL_CLOSED) {
1.27 markus 1837: /*
1838: * Not a closed channel - mark it as draining, which will
1839: * cause it to be freed later.
1840: */
1.41 markus 1841: buffer_consume(&c->input, buffer_len(&c->input));
1842: c->type = SSH_CHANNEL_OUTPUT_DRAINING;
1.25 markus 1843: }
1.1 deraadt 1844: }
1845:
1.41 markus 1846: /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
1.49 markus 1847: void
1.69 markus 1848: channel_input_oclose(int type, int plen, void *ctxt)
1.41 markus 1849: {
1850: int id = packet_get_int();
1851: Channel *c = channel_lookup(id);
1852: packet_integrity_check(plen, 4, type);
1853: if (c == NULL)
1854: packet_disconnect("Received oclose for nonexistent channel %d.", id);
1855: chan_rcvd_oclose(c);
1856: }
1.1 deraadt 1857:
1.49 markus 1858: void
1.69 markus 1859: channel_input_close_confirmation(int type, int plen, void *ctxt)
1.1 deraadt 1860: {
1.41 markus 1861: int id = packet_get_int();
1862: Channel *c = channel_lookup(id);
1.1 deraadt 1863:
1.48 markus 1864: packet_done();
1.41 markus 1865: if (c == NULL)
1866: packet_disconnect("Received close confirmation for "
1867: "out-of-range channel %d.", id);
1868: if (c->type != SSH_CHANNEL_CLOSED)
1869: packet_disconnect("Received close confirmation for "
1870: "non-closed channel %d (type %d).", id, c->type);
1.113 markus 1871: channel_free(c);
1.1 deraadt 1872: }
1873:
1.49 markus 1874: void
1.69 markus 1875: channel_input_open_confirmation(int type, int plen, void *ctxt)
1.1 deraadt 1876: {
1.41 markus 1877: int id, remote_id;
1878: Channel *c;
1.1 deraadt 1879:
1.44 markus 1880: if (!compat20)
1881: packet_integrity_check(plen, 4 + 4, type);
1.25 markus 1882:
1.41 markus 1883: id = packet_get_int();
1884: c = channel_lookup(id);
1.25 markus 1885:
1.41 markus 1886: if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1887: packet_disconnect("Received open confirmation for "
1888: "non-opening channel %d.", id);
1889: remote_id = packet_get_int();
1.27 markus 1890: /* Record the remote channel number and mark that the channel is now open. */
1.41 markus 1891: c->remote_id = remote_id;
1892: c->type = SSH_CHANNEL_OPEN;
1.44 markus 1893:
1894: if (compat20) {
1895: c->remote_window = packet_get_int();
1896: c->remote_maxpacket = packet_get_int();
1.48 markus 1897: packet_done();
1.44 markus 1898: if (c->cb_fn != NULL && c->cb_event == type) {
1.70 markus 1899: debug2("callback start");
1.44 markus 1900: c->cb_fn(c->self, c->cb_arg);
1.70 markus 1901: debug2("callback done");
1.44 markus 1902: }
1903: debug("channel %d: open confirm rwindow %d rmax %d", c->self,
1904: c->remote_window, c->remote_maxpacket);
1905: }
1.1 deraadt 1906: }
1907:
1.127 itojun 1908: static char *
1.114 markus 1909: reason2txt(int reason)
1910: {
1911: switch(reason) {
1912: case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
1913: return "administratively prohibited";
1914: case SSH2_OPEN_CONNECT_FAILED:
1915: return "connect failed";
1916: case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
1917: return "unknown channel type";
1918: case SSH2_OPEN_RESOURCE_SHORTAGE:
1919: return "resource shortage";
1920: }
1.117 stevesk 1921: return "unknown reason";
1.114 markus 1922: }
1923:
1.49 markus 1924: void
1.69 markus 1925: channel_input_open_failure(int type, int plen, void *ctxt)
1.1 deraadt 1926: {
1.86 markus 1927: int id, reason;
1928: char *msg = NULL, *lang = NULL;
1.41 markus 1929: Channel *c;
1930:
1.44 markus 1931: if (!compat20)
1932: packet_integrity_check(plen, 4, type);
1.41 markus 1933:
1934: id = packet_get_int();
1935: c = channel_lookup(id);
1.25 markus 1936:
1.41 markus 1937: if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1938: packet_disconnect("Received open failure for "
1939: "non-opening channel %d.", id);
1.44 markus 1940: if (compat20) {
1.86 markus 1941: reason = packet_get_int();
1.110 markus 1942: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.86 markus 1943: msg = packet_get_string(NULL);
1944: lang = packet_get_string(NULL);
1945: }
1.48 markus 1946: packet_done();
1.114 markus 1947: log("channel %d: open failed: %s%s%s", id,
1948: reason2txt(reason), msg ? ": ": "", msg ? msg : "");
1.86 markus 1949: if (msg != NULL)
1950: xfree(msg);
1951: if (lang != NULL)
1952: xfree(lang);
1.44 markus 1953: }
1.25 markus 1954: /* Free the channel. This will also close the socket. */
1.113 markus 1955: channel_free(c);
1.1 deraadt 1956: }
1957:
1.44 markus 1958: void
1.69 markus 1959: channel_input_channel_request(int type, int plen, void *ctxt)
1.44 markus 1960: {
1961: int id;
1962: Channel *c;
1963:
1964: id = packet_get_int();
1965: c = channel_lookup(id);
1966:
1967: if (c == NULL ||
1968: (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL))
1969: packet_disconnect("Received request for "
1970: "non-open channel %d.", id);
1971: if (c->cb_fn != NULL && c->cb_event == type) {
1.70 markus 1972: debug2("callback start");
1.44 markus 1973: c->cb_fn(c->self, c->cb_arg);
1.70 markus 1974: debug2("callback done");
1.44 markus 1975: } else {
1976: char *service = packet_get_string(NULL);
1.94 markus 1977: debug("channel %d: rcvd request for %s", c->self, service);
1.70 markus 1978: debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event);
1.44 markus 1979: xfree(service);
1980: }
1981: }
1982:
1.121 markus 1983: void
1984: channel_input_window_adjust(int type, int plen, void *ctxt)
1985: {
1986: Channel *c;
1987: int id, adjust;
1988:
1989: if (!compat20)
1990: return;
1991:
1992: /* Get the channel number and verify it. */
1993: id = packet_get_int();
1994: c = channel_lookup(id);
1.1 deraadt 1995:
1.121 markus 1996: if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
1997: log("Received window adjust for "
1998: "non-open channel %d.", id);
1999: return;
2000: }
2001: adjust = packet_get_int();
2002: packet_done();
2003: debug2("channel %d: rcvd adjust %d", id, adjust);
2004: c->remote_window += adjust;
2005: }
1.1 deraadt 2006:
1.121 markus 2007: void
2008: channel_input_port_open(int type, int plen, void *ctxt)
1.1 deraadt 2009: {
1.121 markus 2010: Channel *c = NULL;
2011: u_short host_port;
2012: char *host, *originator_string;
2013: int remote_id, sock = -1;
2014:
2015: remote_id = packet_get_int();
2016: host = packet_get_string(NULL);
2017: host_port = packet_get_int();
1.25 markus 2018:
1.121 markus 2019: if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2020: originator_string = packet_get_string(NULL);
2021: } else {
2022: originator_string = xstrdup("unknown (remote did not supply name)");
2023: }
2024: packet_done();
2025: sock = channel_connect_to(host, host_port);
2026: if (sock != -1) {
2027: c = channel_new("connected socket",
2028: SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
2029: originator_string, 1);
2030: if (c == NULL) {
2031: error("channel_input_port_open: channel_new failed");
2032: close(sock);
2033: } else {
2034: c->remote_id = remote_id;
1.25 markus 2035: }
2036: }
1.121 markus 2037: if (c == NULL) {
2038: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2039: packet_put_int(remote_id);
2040: packet_send();
2041: }
2042: xfree(host);
1.1 deraadt 2043: }
2044:
1.121 markus 2045:
2046: /* -- tcp forwarding */
1.135 markus 2047:
2048: void
2049: channel_set_af(int af)
2050: {
2051: IPv4or6 = af;
2052: }
1.121 markus 2053:
1.27 markus 2054: /*
2055: * Initiate forwarding of connections to local port "port" through the secure
2056: * channel to host:port from remote side.
2057: */
1.87 markus 2058: int
1.73 markus 2059: channel_request_local_forwarding(u_short listen_port, const char *host_to_connect,
2060: u_short port_to_connect, int gateway_ports)
2061: {
1.87 markus 2062: return channel_request_forwarding(
1.73 markus 2063: NULL, listen_port,
2064: host_to_connect, port_to_connect,
2065: gateway_ports, /*remote_fwd*/ 0);
2066: }
1.1 deraadt 2067:
1.73 markus 2068: /*
2069: * If 'remote_fwd' is true we have a '-R style' listener for protocol 2
2070: * (SSH_CHANNEL_RPORT_LISTENER).
2071: */
1.87 markus 2072: int
1.73 markus 2073: channel_request_forwarding(
2074: const char *listen_address, u_short listen_port,
2075: const char *host_to_connect, u_short port_to_connect,
2076: int gateway_ports, int remote_fwd)
1.25 markus 2077: {
1.113 markus 2078: Channel *c;
1.121 markus 2079: int success, sock, on = 1, type;
1.35 markus 2080: struct addrinfo hints, *ai, *aitop;
2081: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
1.73 markus 2082: const char *host;
1.28 markus 2083: struct linger linger;
1.25 markus 2084:
1.87 markus 2085: success = 0;
2086:
1.73 markus 2087: if (remote_fwd) {
2088: host = listen_address;
1.121 markus 2089: type = SSH_CHANNEL_RPORT_LISTENER;
1.73 markus 2090: } else {
2091: host = host_to_connect;
1.121 markus 2092: type = SSH_CHANNEL_PORT_LISTENER;
1.73 markus 2093: }
2094:
1.113 markus 2095: if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
1.87 markus 2096: error("Forward host name too long.");
2097: return success;
2098: }
1.25 markus 2099:
1.73 markus 2100: /* XXX listen_address is currently ignored */
1.28 markus 2101: /*
1.35 markus 2102: * getaddrinfo returns a loopback address if the hostname is
2103: * set to NULL and hints.ai_flags is not AI_PASSIVE
1.28 markus 2104: */
1.35 markus 2105: memset(&hints, 0, sizeof(hints));
2106: hints.ai_family = IPv4or6;
2107: hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
2108: hints.ai_socktype = SOCK_STREAM;
1.73 markus 2109: snprintf(strport, sizeof strport, "%d", listen_port);
1.35 markus 2110: if (getaddrinfo(NULL, strport, &hints, &aitop) != 0)
2111: packet_disconnect("getaddrinfo: fatal error");
2112:
2113: for (ai = aitop; ai; ai = ai->ai_next) {
2114: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2115: continue;
2116: if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2117: strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1.73 markus 2118: error("channel_request_forwarding: getnameinfo failed");
1.35 markus 2119: continue;
2120: }
2121: /* Create a port to listen for the host. */
2122: sock = socket(ai->ai_family, SOCK_STREAM, 0);
2123: if (sock < 0) {
2124: /* this is no error since kernel may not support ipv6 */
2125: verbose("socket: %.100s", strerror(errno));
2126: continue;
2127: }
2128: /*
2129: * Set socket options. We would like the socket to disappear
2130: * as soon as it has been closed for whatever reason.
2131: */
2132: setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
2133: linger.l_onoff = 1;
2134: linger.l_linger = 5;
2135: setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger));
2136: debug("Local forwarding listening on %s port %s.", ntop, strport);
2137:
2138: /* Bind the socket to the address. */
2139: if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2140: /* address can be in use ipv6 address is already bound */
2141: verbose("bind: %.100s", strerror(errno));
2142: close(sock);
2143: continue;
2144: }
2145: /* Start listening for connections on the socket. */
2146: if (listen(sock, 5) < 0) {
2147: error("listen: %.100s", strerror(errno));
2148: close(sock);
2149: continue;
2150: }
2151: /* Allocate a channel number for the socket. */
1.121 markus 2152: c = channel_new("port listener", type, sock, sock, -1,
1.51 markus 2153: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1.71 markus 2154: 0, xstrdup("port listener"), 1);
1.113 markus 2155: if (c == NULL) {
2156: error("channel_request_forwarding: channel_new failed");
2157: close(sock);
2158: continue;
2159: }
2160: strlcpy(c->path, host, sizeof(c->path));
2161: c->host_port = port_to_connect;
2162: c->listening_port = listen_port;
1.35 markus 2163: success = 1;
2164: }
2165: if (success == 0)
1.87 markus 2166: error("channel_request_forwarding: cannot listen to port: %d",
2167: listen_port);
1.35 markus 2168: freeaddrinfo(aitop);
1.87 markus 2169: return success;
1.25 markus 2170: }
1.1 deraadt 2171:
1.27 markus 2172: /*
2173: * Initiate forwarding of connections to port "port" on remote host through
2174: * the secure channel to host:port from local side.
2175: */
1.1 deraadt 2176:
1.49 markus 2177: void
1.73 markus 2178: channel_request_remote_forwarding(u_short listen_port,
2179: const char *host_to_connect, u_short port_to_connect)
1.25 markus 2180: {
1.73 markus 2181: int payload_len, type, success = 0;
2182:
1.25 markus 2183: /* Record locally that connection to this host/port is permitted. */
2184: if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2185: fatal("channel_request_remote_forwarding: too many forwards");
2186:
2187: /* Send the forward request to the remote side. */
1.44 markus 2188: if (compat20) {
2189: const char *address_to_bind = "0.0.0.0";
2190: packet_start(SSH2_MSG_GLOBAL_REQUEST);
2191: packet_put_cstring("tcpip-forward");
2192: packet_put_char(0); /* boolean: want reply */
2193: packet_put_cstring(address_to_bind);
2194: packet_put_int(listen_port);
1.73 markus 2195: packet_send();
2196: packet_write_wait();
2197: /* Assume that server accepts the request */
2198: success = 1;
1.44 markus 2199: } else {
2200: packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
1.50 markus 2201: packet_put_int(listen_port);
2202: packet_put_cstring(host_to_connect);
1.44 markus 2203: packet_put_int(port_to_connect);
2204: packet_send();
2205: packet_write_wait();
1.73 markus 2206:
2207: /* Wait for response from the remote side. */
2208: type = packet_read(&payload_len);
2209: switch (type) {
2210: case SSH_SMSG_SUCCESS:
2211: success = 1;
2212: break;
2213: case SSH_SMSG_FAILURE:
2214: log("Warning: Server denied remote port forwarding.");
2215: break;
2216: default:
2217: /* Unknown packet */
2218: packet_disconnect("Protocol error for port forward request:"
2219: "received packet type %d.", type);
2220: }
2221: }
2222: if (success) {
2223: permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2224: permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2225: permitted_opens[num_permitted_opens].listen_port = listen_port;
2226: num_permitted_opens++;
1.44 markus 2227: }
1.1 deraadt 2228: }
2229:
1.27 markus 2230: /*
2231: * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2232: * listening for the port, and sends back a success reply (or disconnect
2233: * message if there was an error). This never returns if there was an error.
2234: */
1.1 deraadt 2235:
1.49 markus 2236: void
1.56 markus 2237: channel_input_port_forward_request(int is_root, int gateway_ports)
1.1 deraadt 2238: {
1.31 markus 2239: u_short port, host_port;
1.25 markus 2240: char *hostname;
1.1 deraadt 2241:
1.25 markus 2242: /* Get arguments from the packet. */
2243: port = packet_get_int();
2244: hostname = packet_get_string(NULL);
2245: host_port = packet_get_int();
2246:
1.27 markus 2247: /*
2248: * Check that an unprivileged user is not trying to forward a
2249: * privileged port.
2250: */
1.25 markus 2251: if (port < IPPORT_RESERVED && !is_root)
2252: packet_disconnect("Requested forwarding of port %d but user is not root.",
2253: port);
1.73 markus 2254: /* Initiate forwarding */
1.56 markus 2255: channel_request_local_forwarding(port, hostname, host_port, gateway_ports);
1.25 markus 2256:
2257: /* Free the argument string. */
2258: xfree(hostname);
1.1 deraadt 2259: }
2260:
1.99 markus 2261: /*
2262: * Permits opening to any host/port if permitted_opens[] is empty. This is
2263: * usually called by the server, because the user could connect to any port
2264: * anyway, and the server has no way to know but to trust the client anyway.
2265: */
2266: void
2267: channel_permit_all_opens()
2268: {
2269: if (num_permitted_opens == 0)
2270: all_opens_permitted = 1;
2271: }
2272:
1.101 markus 2273: void
1.99 markus 2274: channel_add_permitted_opens(char *host, int port)
2275: {
2276: if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2277: fatal("channel_request_remote_forwarding: too many forwards");
2278: debug("allow port forwarding to host %s port %d", host, port);
2279:
2280: permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2281: permitted_opens[num_permitted_opens].port_to_connect = port;
2282: num_permitted_opens++;
2283:
2284: all_opens_permitted = 0;
2285: }
2286:
1.101 markus 2287: void
1.99 markus 2288: channel_clear_permitted_opens(void)
2289: {
2290: int i;
2291:
2292: for (i = 0; i < num_permitted_opens; i++)
2293: xfree(permitted_opens[i].host_to_connect);
2294: num_permitted_opens = 0;
2295:
2296: }
2297:
2298:
2299: /* return socket to remote host, port */
1.127 itojun 2300: static int
1.99 markus 2301: connect_to(const char *host, u_short port)
1.41 markus 2302: {
2303: struct addrinfo hints, *ai, *aitop;
2304: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2305: int gaierr;
2306: int sock = -1;
2307:
2308: memset(&hints, 0, sizeof(hints));
2309: hints.ai_family = IPv4or6;
2310: hints.ai_socktype = SOCK_STREAM;
1.99 markus 2311: snprintf(strport, sizeof strport, "%d", port);
1.41 markus 2312: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
1.99 markus 2313: error("connect_to %.100s: unknown host (%s)", host,
2314: gai_strerror(gaierr));
1.41 markus 2315: return -1;
2316: }
2317: for (ai = aitop; ai; ai = ai->ai_next) {
2318: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2319: continue;
2320: if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2321: strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1.99 markus 2322: error("connect_to: getnameinfo failed");
1.41 markus 2323: continue;
2324: }
2325: sock = socket(ai->ai_family, SOCK_STREAM, 0);
2326: if (sock < 0) {
2327: error("socket: %.100s", strerror(errno));
2328: continue;
2329: }
1.80 markus 2330: if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0)
1.75 markus 2331: fatal("connect_to: F_SETFL: %s", strerror(errno));
2332: if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
2333: errno != EINPROGRESS) {
1.99 markus 2334: error("connect_to %.100s port %s: %.100s", ntop, strport,
1.41 markus 2335: strerror(errno));
2336: close(sock);
1.89 stevesk 2337: continue; /* fail -- try next */
1.41 markus 2338: }
2339: break; /* success */
2340:
2341: }
2342: freeaddrinfo(aitop);
2343: if (!ai) {
1.99 markus 2344: error("connect_to %.100s port %d: failed.", host, port);
1.41 markus 2345: return -1;
2346: }
2347: /* success */
2348: return sock;
2349: }
1.99 markus 2350:
1.73 markus 2351: int
1.130 stevesk 2352: channel_connect_by_listen_address(u_short listen_port)
1.73 markus 2353: {
2354: int i;
1.99 markus 2355:
1.73 markus 2356: for (i = 0; i < num_permitted_opens; i++)
2357: if (permitted_opens[i].listen_port == listen_port)
1.99 markus 2358: return connect_to(
1.73 markus 2359: permitted_opens[i].host_to_connect,
2360: permitted_opens[i].port_to_connect);
1.74 markus 2361: error("WARNING: Server requests forwarding for unknown listen_port %d",
2362: listen_port);
1.73 markus 2363: return -1;
2364: }
2365:
1.99 markus 2366: /* Check if connecting to that port is permitted and connect. */
2367: int
2368: channel_connect_to(const char *host, u_short port)
2369: {
2370: int i, permit;
2371:
2372: permit = all_opens_permitted;
2373: if (!permit) {
2374: for (i = 0; i < num_permitted_opens; i++)
2375: if (permitted_opens[i].port_to_connect == port &&
2376: strcmp(permitted_opens[i].host_to_connect, host) == 0)
2377: permit = 1;
2378:
2379: }
2380: if (!permit) {
2381: log("Received request to connect to host %.100s port %d, "
2382: "but the request was denied.", host, port);
2383: return -1;
2384: }
2385: return connect_to(host, port);
2386: }
2387:
1.121 markus 2388: /* -- X11 forwarding */
1.1 deraadt 2389:
1.27 markus 2390: /*
2391: * Creates an internet domain socket for listening for X11 connections.
2392: * Returns a suitable value for the DISPLAY variable, or NULL if an error
2393: * occurs.
2394: */
1.25 markus 2395: char *
1.33 markus 2396: x11_create_display_inet(int screen_number, int x11_display_offset)
1.1 deraadt 2397: {
1.31 markus 2398: int display_number, sock;
2399: u_short port;
1.35 markus 2400: struct addrinfo hints, *ai, *aitop;
2401: char strport[NI_MAXSERV];
2402: int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
2403: char display[512];
1.25 markus 2404: char hostname[MAXHOSTNAMELEN];
2405:
1.33 markus 2406: for (display_number = x11_display_offset;
1.25 markus 2407: display_number < MAX_DISPLAYS;
2408: display_number++) {
2409: port = 6000 + display_number;
1.35 markus 2410: memset(&hints, 0, sizeof(hints));
2411: hints.ai_family = IPv4or6;
1.36 markus 2412: hints.ai_flags = AI_PASSIVE; /* XXX loopback only ? */
1.35 markus 2413: hints.ai_socktype = SOCK_STREAM;
2414: snprintf(strport, sizeof strport, "%d", port);
2415: if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
2416: error("getaddrinfo: %.100s", gai_strerror(gaierr));
1.25 markus 2417: return NULL;
2418: }
1.35 markus 2419: for (ai = aitop; ai; ai = ai->ai_next) {
2420: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2421: continue;
2422: sock = socket(ai->ai_family, SOCK_STREAM, 0);
2423: if (sock < 0) {
2424: error("socket: %.100s", strerror(errno));
2425: return NULL;
2426: }
2427: if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2428: debug("bind port %d: %.100s", port, strerror(errno));
2429: shutdown(sock, SHUT_RDWR);
2430: close(sock);
2431: for (n = 0; n < num_socks; n++) {
2432: shutdown(socks[n], SHUT_RDWR);
2433: close(socks[n]);
2434: }
2435: num_socks = 0;
2436: break;
2437: }
2438: socks[num_socks++] = sock;
2439: if (num_socks == NUM_SOCKS)
2440: break;
1.25 markus 2441: }
1.83 stevesk 2442: freeaddrinfo(aitop);
1.35 markus 2443: if (num_socks > 0)
2444: break;
1.25 markus 2445: }
2446: if (display_number >= MAX_DISPLAYS) {
2447: error("Failed to allocate internet-domain X11 display socket.");
2448: return NULL;
2449: }
2450: /* Start listening for connections on the socket. */
1.35 markus 2451: for (n = 0; n < num_socks; n++) {
2452: sock = socks[n];
2453: if (listen(sock, 5) < 0) {
2454: error("listen: %.100s", strerror(errno));
2455: shutdown(sock, SHUT_RDWR);
2456: close(sock);
2457: return NULL;
2458: }
1.25 markus 2459: }
1.35 markus 2460:
1.25 markus 2461: /* Set up a suitable value for the DISPLAY variable. */
2462: if (gethostname(hostname, sizeof(hostname)) < 0)
2463: fatal("gethostname: %.100s", strerror(errno));
1.35 markus 2464: snprintf(display, sizeof display, "%.400s:%d.%d", hostname,
1.25 markus 2465: display_number, screen_number);
2466:
1.35 markus 2467: /* Allocate a channel for each socket. */
2468: for (n = 0; n < num_socks; n++) {
2469: sock = socks[n];
1.51 markus 2470: (void) channel_new("x11 listener",
2471: SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
2472: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.71 markus 2473: 0, xstrdup("X11 inet listener"), 1);
1.35 markus 2474: }
1.1 deraadt 2475:
1.25 markus 2476: /* Return a suitable value for the DISPLAY environment variable. */
1.35 markus 2477: return xstrdup(display);
1.1 deraadt 2478: }
2479:
2480: #ifndef X_UNIX_PATH
2481: #define X_UNIX_PATH "/tmp/.X11-unix/X"
2482: #endif
2483:
1.127 itojun 2484: static int
1.77 markus 2485: connect_local_xsocket(u_int dnr)
1.1 deraadt 2486: {
1.25 markus 2487: static const char *const x_sockets[] = {
2488: X_UNIX_PATH "%u",
2489: "/var/X/.X11-unix/X" "%u",
2490: "/usr/spool/sockets/X11/" "%u",
2491: NULL
2492: };
2493: int sock;
2494: struct sockaddr_un addr;
2495: const char *const * path;
2496:
2497: for (path = x_sockets; *path; ++path) {
2498: sock = socket(AF_UNIX, SOCK_STREAM, 0);
2499: if (sock < 0)
2500: error("socket: %.100s", strerror(errno));
2501: memset(&addr, 0, sizeof(addr));
2502: addr.sun_family = AF_UNIX;
2503: snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr);
2504: if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
2505: return sock;
2506: close(sock);
2507: }
2508: error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
2509: return -1;
1.1 deraadt 2510: }
2511:
1.51 markus 2512: int
2513: x11_connect_display(void)
1.1 deraadt 2514: {
1.51 markus 2515: int display_number, sock = 0;
1.25 markus 2516: const char *display;
1.51 markus 2517: char buf[1024], *cp;
1.35 markus 2518: struct addrinfo hints, *ai, *aitop;
2519: char strport[NI_MAXSERV];
2520: int gaierr;
1.25 markus 2521:
2522: /* Try to open a socket for the local X server. */
2523: display = getenv("DISPLAY");
2524: if (!display) {
2525: error("DISPLAY not set.");
1.51 markus 2526: return -1;
1.25 markus 2527: }
1.27 markus 2528: /*
2529: * Now we decode the value of the DISPLAY variable and make a
2530: * connection to the real X server.
2531: */
2532:
2533: /*
2534: * Check if it is a unix domain socket. Unix domain displays are in
2535: * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
2536: */
1.25 markus 2537: if (strncmp(display, "unix:", 5) == 0 ||
2538: display[0] == ':') {
2539: /* Connect to the unix domain socket. */
2540: if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
2541: error("Could not parse display number from DISPLAY: %.100s",
2542: display);
1.51 markus 2543: return -1;
1.25 markus 2544: }
2545: /* Create a socket. */
2546: sock = connect_local_xsocket(display_number);
2547: if (sock < 0)
1.51 markus 2548: return -1;
1.25 markus 2549:
2550: /* OK, we now have a connection to the display. */
1.51 markus 2551: return sock;
1.25 markus 2552: }
1.27 markus 2553: /*
2554: * Connect to an inet socket. The DISPLAY value is supposedly
2555: * hostname:d[.s], where hostname may also be numeric IP address.
2556: */
1.25 markus 2557: strncpy(buf, display, sizeof(buf));
2558: buf[sizeof(buf) - 1] = 0;
2559: cp = strchr(buf, ':');
2560: if (!cp) {
2561: error("Could not find ':' in DISPLAY: %.100s", display);
1.51 markus 2562: return -1;
1.25 markus 2563: }
2564: *cp = 0;
1.27 markus 2565: /* buf now contains the host name. But first we parse the display number. */
1.25 markus 2566: if (sscanf(cp + 1, "%d", &display_number) != 1) {
2567: error("Could not parse display number from DISPLAY: %.100s",
2568: display);
1.51 markus 2569: return -1;
1.25 markus 2570: }
1.35 markus 2571:
2572: /* Look up the host address */
2573: memset(&hints, 0, sizeof(hints));
2574: hints.ai_family = IPv4or6;
2575: hints.ai_socktype = SOCK_STREAM;
2576: snprintf(strport, sizeof strport, "%d", 6000 + display_number);
2577: if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
2578: error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
1.51 markus 2579: return -1;
1.25 markus 2580: }
1.35 markus 2581: for (ai = aitop; ai; ai = ai->ai_next) {
2582: /* Create a socket. */
2583: sock = socket(ai->ai_family, SOCK_STREAM, 0);
2584: if (sock < 0) {
2585: debug("socket: %.100s", strerror(errno));
1.41 markus 2586: continue;
2587: }
2588: /* Connect it to the display. */
2589: if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2590: debug("connect %.100s port %d: %.100s", buf,
2591: 6000 + display_number, strerror(errno));
2592: close(sock);
2593: continue;
2594: }
2595: /* Success */
2596: break;
1.35 markus 2597: }
2598: freeaddrinfo(aitop);
2599: if (!ai) {
1.49 markus 2600: error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
1.35 markus 2601: strerror(errno));
1.51 markus 2602: return -1;
1.25 markus 2603: }
1.51 markus 2604: return sock;
2605: }
2606:
2607: /*
2608: * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
2609: * the remote channel number. We should do whatever we want, and respond
2610: * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2611: */
2612:
2613: void
1.69 markus 2614: x11_input_open(int type, int plen, void *ctxt)
1.51 markus 2615: {
1.113 markus 2616: Channel *c = NULL;
2617: int remote_id, sock = 0;
1.51 markus 2618: char *remote_host;
1.25 markus 2619:
1.113 markus 2620: debug("Received X11 open request.");
1.51 markus 2621:
1.113 markus 2622: remote_id = packet_get_int();
1.121 markus 2623:
2624: if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
1.113 markus 2625: remote_host = packet_get_string(NULL);
1.51 markus 2626: } else {
2627: remote_host = xstrdup("unknown (remote did not supply name)");
2628: }
1.113 markus 2629: packet_done();
1.25 markus 2630:
1.51 markus 2631: /* Obtain a connection to the real X display. */
2632: sock = x11_connect_display();
1.113 markus 2633: if (sock != -1) {
2634: /* Allocate a channel for this connection. */
2635: c = channel_new("connected x11 socket",
2636: SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
2637: remote_host, 1);
2638: if (c == NULL) {
2639: error("x11_input_open: channel_new failed");
2640: close(sock);
2641: } else {
2642: c->remote_id = remote_id;
1.133 markus 2643: c->force_drain = 1;
1.113 markus 2644: }
2645: }
2646: if (c == NULL) {
1.51 markus 2647: /* Send refusal to the remote host. */
2648: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1.113 markus 2649: packet_put_int(remote_id);
1.51 markus 2650: } else {
2651: /* Send a confirmation to the remote host. */
2652: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1.113 markus 2653: packet_put_int(remote_id);
2654: packet_put_int(c->self);
1.51 markus 2655: }
1.113 markus 2656: packet_send();
1.72 markus 2657: }
2658:
2659: /* dummy protocol handler that denies SSH-1 requests (agent/x11) */
2660: void
2661: deny_input_open(int type, int plen, void *ctxt)
2662: {
2663: int rchan = packet_get_int();
2664: switch(type){
2665: case SSH_SMSG_AGENT_OPEN:
2666: error("Warning: ssh server tried agent forwarding.");
2667: break;
2668: case SSH_SMSG_X11_OPEN:
2669: error("Warning: ssh server tried X11 forwarding.");
2670: break;
2671: default:
2672: error("deny_input_open: type %d plen %d", type, plen);
2673: break;
2674: }
2675: error("Warning: this is probably a break in attempt by a malicious server.");
2676: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2677: packet_put_int(rchan);
2678: packet_send();
1.1 deraadt 2679: }
2680:
1.27 markus 2681: /*
2682: * Requests forwarding of X11 connections, generates fake authentication
2683: * data, and enables authentication spoofing.
1.121 markus 2684: * This should be called in the client only.
1.27 markus 2685: */
1.49 markus 2686: void
1.51 markus 2687: x11_request_forwarding_with_spoofing(int client_session_id,
2688: const char *proto, const char *data)
1.1 deraadt 2689: {
1.77 markus 2690: u_int data_len = (u_int) strlen(data) / 2;
1.90 markus 2691: u_int i, value, len;
1.25 markus 2692: char *new_data;
2693: int screen_number;
2694: const char *cp;
2695: u_int32_t rand = 0;
2696:
2697: cp = getenv("DISPLAY");
2698: if (cp)
2699: cp = strchr(cp, ':');
2700: if (cp)
2701: cp = strchr(cp, '.');
2702: if (cp)
2703: screen_number = atoi(cp + 1);
2704: else
2705: screen_number = 0;
2706:
2707: /* Save protocol name. */
2708: x11_saved_proto = xstrdup(proto);
2709:
1.27 markus 2710: /*
2711: * Extract real authentication data and generate fake data of the
2712: * same length.
2713: */
1.25 markus 2714: x11_saved_data = xmalloc(data_len);
2715: x11_fake_data = xmalloc(data_len);
2716: for (i = 0; i < data_len; i++) {
2717: if (sscanf(data + 2 * i, "%2x", &value) != 1)
2718: fatal("x11_request_forwarding: bad authentication data: %.100s", data);
2719: if (i % 4 == 0)
2720: rand = arc4random();
2721: x11_saved_data[i] = value;
2722: x11_fake_data[i] = rand & 0xff;
2723: rand >>= 8;
2724: }
2725: x11_saved_data_len = data_len;
2726: x11_fake_data_len = data_len;
2727:
2728: /* Convert the fake data into hex. */
1.90 markus 2729: len = 2 * data_len + 1;
2730: new_data = xmalloc(len);
1.25 markus 2731: for (i = 0; i < data_len; i++)
1.90 markus 2732: snprintf(new_data + 2 * i, len - 2 * i,
2733: "%02x", (u_char) x11_fake_data[i]);
1.25 markus 2734:
2735: /* Send the request packet. */
1.51 markus 2736: if (compat20) {
2737: channel_request_start(client_session_id, "x11-req", 0);
2738: packet_put_char(0); /* XXX bool single connection */
2739: } else {
2740: packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
2741: }
2742: packet_put_cstring(proto);
2743: packet_put_cstring(new_data);
1.25 markus 2744: packet_put_int(screen_number);
2745: packet_send();
2746: packet_write_wait();
2747: xfree(new_data);
1.1 deraadt 2748: }
2749:
1.121 markus 2750:
2751: /* -- agent forwarding */
2752:
1.1 deraadt 2753: /* Sends a message to the server to request authentication fd forwarding. */
2754:
1.49 markus 2755: void
1.25 markus 2756: auth_request_forwarding()
1.1 deraadt 2757: {
1.25 markus 2758: packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
2759: packet_send();
2760: packet_write_wait();
1.1 deraadt 2761: }
2762:
1.27 markus 2763: /*
2764: * Returns the name of the forwarded authentication socket. Returns NULL if
2765: * there is no forwarded authentication socket. The returned value points to
2766: * a static buffer.
2767: */
1.1 deraadt 2768:
1.25 markus 2769: char *
2770: auth_get_socket_name()
1.1 deraadt 2771: {
1.121 markus 2772: return auth_sock_name;
1.1 deraadt 2773: }
2774:
1.12 markus 2775: /* removes the agent forwarding socket */
2776:
1.49 markus 2777: void
1.123 markus 2778: auth_sock_cleanup_proc(void *_pw)
1.25 markus 2779: {
1.123 markus 2780: struct passwd *pw = _pw;
2781:
1.122 markus 2782: if (auth_sock_name) {
1.123 markus 2783: temporarily_use_uid(pw);
1.122 markus 2784: unlink(auth_sock_name);
2785: rmdir(auth_sock_dir);
2786: auth_sock_name = NULL;
1.123 markus 2787: restore_uid();
1.122 markus 2788: }
1.12 markus 2789: }
2790:
1.27 markus 2791: /*
1.59 markus 2792: * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
1.27 markus 2793: * This starts forwarding authentication requests.
2794: */
1.1 deraadt 2795:
1.59 markus 2796: int
1.25 markus 2797: auth_input_request_forwarding(struct passwd * pw)
1.1 deraadt 2798: {
1.113 markus 2799: Channel *nc;
2800: int sock;
1.25 markus 2801: struct sockaddr_un sunaddr;
2802:
1.121 markus 2803: if (auth_get_socket_name() != NULL) {
2804: error("authentication forwarding requested twice.");
2805: return 0;
2806: }
1.25 markus 2807:
2808: /* Temporarily drop privileged uid for mkdir/bind. */
1.102 markus 2809: temporarily_use_uid(pw);
1.25 markus 2810:
2811: /* Allocate a buffer for the socket name, and format the name. */
1.121 markus 2812: auth_sock_name = xmalloc(MAXPATHLEN);
2813: auth_sock_dir = xmalloc(MAXPATHLEN);
2814: strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
1.25 markus 2815:
2816: /* Create private directory for socket */
1.121 markus 2817: if (mkdtemp(auth_sock_dir) == NULL) {
2818: packet_send_debug("Agent forwarding disabled: "
2819: "mkdtemp() failed: %.100s", strerror(errno));
1.59 markus 2820: restore_uid();
1.121 markus 2821: xfree(auth_sock_name);
2822: xfree(auth_sock_dir);
2823: auth_sock_name = NULL;
2824: auth_sock_dir = NULL;
1.59 markus 2825: return 0;
2826: }
1.121 markus 2827: snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%d",
2828: auth_sock_dir, (int) getpid());
1.25 markus 2829:
1.122 markus 2830: /* delete agent socket on fatal() */
1.123 markus 2831: fatal_add_cleanup(auth_sock_cleanup_proc, pw);
1.122 markus 2832:
1.25 markus 2833: /* Create the socket. */
2834: sock = socket(AF_UNIX, SOCK_STREAM, 0);
2835: if (sock < 0)
2836: packet_disconnect("socket: %.100s", strerror(errno));
2837:
2838: /* Bind it to the name. */
2839: memset(&sunaddr, 0, sizeof(sunaddr));
2840: sunaddr.sun_family = AF_UNIX;
1.121 markus 2841: strncpy(sunaddr.sun_path, auth_sock_name,
1.25 markus 2842: sizeof(sunaddr.sun_path));
2843:
2844: if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
2845: packet_disconnect("bind: %.100s", strerror(errno));
2846:
2847: /* Restore the privileged uid. */
2848: restore_uid();
2849:
2850: /* Start listening on the socket. */
2851: if (listen(sock, 5) < 0)
2852: packet_disconnect("listen: %.100s", strerror(errno));
2853:
2854: /* Allocate a channel for the authentication agent socket. */
1.113 markus 2855: nc = channel_new("auth socket",
1.73 markus 2856: SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
2857: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
2858: 0, xstrdup("auth socket"), 1);
1.113 markus 2859: if (nc == NULL) {
2860: error("auth_input_request_forwarding: channel_new failed");
1.123 markus 2861: auth_sock_cleanup_proc(pw);
1.124 markus 2862: fatal_remove_cleanup(auth_sock_cleanup_proc, pw);
1.113 markus 2863: close(sock);
2864: return 0;
2865: }
1.121 markus 2866: strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
1.59 markus 2867: return 1;
1.1 deraadt 2868: }
2869:
2870: /* This is called to process an SSH_SMSG_AGENT_OPEN message. */
2871:
1.49 markus 2872: void
1.69 markus 2873: auth_input_open_request(int type, int plen, void *ctxt)
1.1 deraadt 2874: {
1.113 markus 2875: Channel *c = NULL;
2876: int remote_id, sock;
1.121 markus 2877: char *name;
1.41 markus 2878:
2879: packet_integrity_check(plen, 4, type);
1.25 markus 2880:
2881: /* Read the remote channel number from the message. */
1.113 markus 2882: remote_id = packet_get_int();
1.25 markus 2883:
1.27 markus 2884: /*
2885: * Get a connection to the local authentication agent (this may again
2886: * get forwarded).
2887: */
1.25 markus 2888: sock = ssh_get_authentication_socket();
2889:
1.27 markus 2890: /*
2891: * If we could not connect the agent, send an error message back to
2892: * the server. This should never happen unless the agent dies,
2893: * because authentication forwarding is only enabled if we have an
2894: * agent.
2895: */
1.113 markus 2896: if (sock >= 0) {
1.121 markus 2897: name = xstrdup("authentication agent connection");
2898: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
2899: -1, 0, 0, 0, name, 1);
1.113 markus 2900: if (c == NULL) {
2901: error("auth_input_open_request: channel_new failed");
1.121 markus 2902: xfree(name);
1.113 markus 2903: close(sock);
2904: } else {
2905: c->remote_id = remote_id;
1.133 markus 2906: c->force_drain = 1;
1.113 markus 2907: }
2908: }
2909: if (c == NULL) {
1.25 markus 2910: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1.113 markus 2911: packet_put_int(remote_id);
2912: } else {
2913: /* Send a confirmation to the remote host. */
2914: debug("Forwarding authentication connection.");
2915: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
2916: packet_put_int(remote_id);
2917: packet_put_int(c->self);
1.25 markus 2918: }
2919: packet_send();
1.1 deraadt 2920: }
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