Annotation of src/usr.bin/ssh/channels.c, Revision 1.137
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"
1.137 ! markus 42: RCSID("$OpenBSD: channels.c,v 1.136 2001/10/04 15:05:40 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]);
1.121 markus 360: }
361:
1.131 markus 362: void
363: channel_detach_all(void)
364: {
365: int i;
366: Channel *c;
367:
368: for (i = 0; i < channels_alloc; i++) {
369: c = channels[i];
370: if (c != NULL && c->detach_user != NULL) {
371: debug("channel_detach_all: channel %d", c->self);
372: c->detach_user(c->self, NULL);
373: c->detach_user = NULL;
374: }
375: }
376: }
377:
1.121 markus 378: /*
379: * Closes the sockets/fds of all channels. This is used to close extra file
380: * descriptors after a fork.
381: */
382:
383: void
384: channel_close_all()
385: {
386: int i;
387:
388: for (i = 0; i < channels_alloc; i++)
389: if (channels[i] != NULL)
390: channel_close_fds(channels[i]);
391: }
392:
393: /*
1.131 markus 394: * Stop listening to channels.
395: */
396:
397: void
398: channel_stop_listening(void)
399: {
400: int i;
401: Channel *c;
402:
403: for (i = 0; i < channels_alloc; i++) {
404: c = channels[i];
405: if (c != NULL) {
406: switch (c->type) {
407: case SSH_CHANNEL_AUTH_SOCKET:
408: case SSH_CHANNEL_PORT_LISTENER:
409: case SSH_CHANNEL_RPORT_LISTENER:
410: case SSH_CHANNEL_X11_LISTENER:
1.132 markus 411: channel_close_fd(&c->sock);
1.131 markus 412: channel_free(c);
413: break;
414: }
415: }
416: }
417: }
418:
419: /*
1.121 markus 420: * Returns true if no channel has too much buffered data, and false if one or
421: * more channel is overfull.
422: */
423:
424: int
425: channel_not_very_much_buffered_data()
426: {
427: u_int i;
428: Channel *c;
429:
430: for (i = 0; i < channels_alloc; i++) {
431: c = channels[i];
432: if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
1.136 markus 433: #if 0
434: if (!compat20 &&
435: buffer_len(&c->input) > packet_get_maxsize()) {
1.121 markus 436: debug("channel %d: big input buffer %d",
437: c->self, buffer_len(&c->input));
438: return 0;
439: }
1.136 markus 440: #endif
1.121 markus 441: if (buffer_len(&c->output) > packet_get_maxsize()) {
1.136 markus 442: debug("channel %d: big output buffer %d > %d",
443: c->self, buffer_len(&c->output),
444: packet_get_maxsize());
1.121 markus 445: return 0;
446: }
447: }
448: }
449: return 1;
450: }
451:
452: /* Returns true if any channel is still open. */
453:
454: int
455: channel_still_open()
456: {
457: int i;
458: Channel *c;
459:
460: for (i = 0; i < channels_alloc; i++) {
461: c = channels[i];
462: if (c == NULL)
463: continue;
464: switch (c->type) {
465: case SSH_CHANNEL_X11_LISTENER:
466: case SSH_CHANNEL_PORT_LISTENER:
467: case SSH_CHANNEL_RPORT_LISTENER:
468: case SSH_CHANNEL_CLOSED:
469: case SSH_CHANNEL_AUTH_SOCKET:
470: case SSH_CHANNEL_DYNAMIC:
471: case SSH_CHANNEL_CONNECTING:
472: case SSH_CHANNEL_ZOMBIE:
473: continue;
474: case SSH_CHANNEL_LARVAL:
475: if (!compat20)
476: fatal("cannot happen: SSH_CHANNEL_LARVAL");
477: continue;
478: case SSH_CHANNEL_OPENING:
479: case SSH_CHANNEL_OPEN:
480: case SSH_CHANNEL_X11_OPEN:
481: return 1;
482: case SSH_CHANNEL_INPUT_DRAINING:
483: case SSH_CHANNEL_OUTPUT_DRAINING:
484: if (!compat13)
485: fatal("cannot happen: OUT_DRAIN");
486: return 1;
487: default:
488: fatal("channel_still_open: bad channel type %d", c->type);
489: /* NOTREACHED */
490: }
491: }
492: return 0;
493: }
494:
495: /* Returns the id of an open channel suitable for keepaliving */
496:
497: int
498: channel_find_open()
499: {
500: int i;
501: Channel *c;
502:
503: for (i = 0; i < channels_alloc; i++) {
504: c = channels[i];
505: if (c == NULL)
506: continue;
507: switch (c->type) {
508: case SSH_CHANNEL_CLOSED:
509: case SSH_CHANNEL_DYNAMIC:
510: case SSH_CHANNEL_X11_LISTENER:
511: case SSH_CHANNEL_PORT_LISTENER:
512: case SSH_CHANNEL_RPORT_LISTENER:
513: case SSH_CHANNEL_OPENING:
514: case SSH_CHANNEL_CONNECTING:
515: case SSH_CHANNEL_ZOMBIE:
516: continue;
517: case SSH_CHANNEL_LARVAL:
518: case SSH_CHANNEL_AUTH_SOCKET:
519: case SSH_CHANNEL_OPEN:
520: case SSH_CHANNEL_X11_OPEN:
521: return i;
522: case SSH_CHANNEL_INPUT_DRAINING:
523: case SSH_CHANNEL_OUTPUT_DRAINING:
524: if (!compat13)
525: fatal("cannot happen: OUT_DRAIN");
526: return i;
527: default:
528: fatal("channel_find_open: bad channel type %d", c->type);
529: /* NOTREACHED */
530: }
531: }
532: return -1;
533: }
534:
535:
536: /*
537: * Returns a message describing the currently open forwarded connections,
538: * suitable for sending to the client. The message contains crlf pairs for
539: * newlines.
540: */
541:
542: char *
543: channel_open_message()
544: {
545: Buffer buffer;
546: Channel *c;
547: char buf[1024], *cp;
548: int i;
549:
550: buffer_init(&buffer);
551: snprintf(buf, sizeof buf, "The following connections are open:\r\n");
552: buffer_append(&buffer, buf, strlen(buf));
553: for (i = 0; i < channels_alloc; i++) {
554: c = channels[i];
555: if (c == NULL)
556: continue;
557: switch (c->type) {
558: case SSH_CHANNEL_X11_LISTENER:
559: case SSH_CHANNEL_PORT_LISTENER:
560: case SSH_CHANNEL_RPORT_LISTENER:
561: case SSH_CHANNEL_CLOSED:
562: case SSH_CHANNEL_AUTH_SOCKET:
563: case SSH_CHANNEL_ZOMBIE:
564: continue;
565: case SSH_CHANNEL_LARVAL:
566: case SSH_CHANNEL_OPENING:
567: case SSH_CHANNEL_CONNECTING:
568: case SSH_CHANNEL_DYNAMIC:
569: case SSH_CHANNEL_OPEN:
570: case SSH_CHANNEL_X11_OPEN:
571: case SSH_CHANNEL_INPUT_DRAINING:
572: case SSH_CHANNEL_OUTPUT_DRAINING:
573: snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n",
574: c->self, c->remote_name,
575: c->type, c->remote_id,
576: c->istate, buffer_len(&c->input),
577: c->ostate, buffer_len(&c->output),
578: c->rfd, c->wfd);
579: buffer_append(&buffer, buf, strlen(buf));
580: continue;
581: default:
582: fatal("channel_open_message: bad channel type %d", c->type);
583: /* NOTREACHED */
584: }
585: }
586: buffer_append(&buffer, "\0", 1);
587: cp = xstrdup(buffer_ptr(&buffer));
588: buffer_free(&buffer);
589: return cp;
590: }
591:
592: void
593: channel_send_open(int id)
594: {
595: Channel *c = channel_lookup(id);
596: if (c == NULL) {
597: log("channel_send_open: %d: bad id", id);
598: return;
599: }
600: debug("send channel open %d", id);
601: packet_start(SSH2_MSG_CHANNEL_OPEN);
602: packet_put_cstring(c->ctype);
603: packet_put_int(c->self);
604: packet_put_int(c->local_window);
605: packet_put_int(c->local_maxpacket);
606: packet_send();
607: }
608:
609: void
610: channel_request(int id, char *service, int wantconfirm)
611: {
612: channel_request_start(id, service, wantconfirm);
613: packet_send();
614: debug("channel request %d: %s", id, service) ;
615: }
616: void
617: channel_request_start(int id, char *service, int wantconfirm)
618: {
619: Channel *c = channel_lookup(id);
620: if (c == NULL) {
621: log("channel_request: %d: bad id", id);
622: return;
623: }
624: packet_start(SSH2_MSG_CHANNEL_REQUEST);
625: packet_put_int(c->remote_id);
626: packet_put_cstring(service);
627: packet_put_char(wantconfirm);
628: }
629: void
630: channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg)
631: {
632: Channel *c = channel_lookup(id);
633: if (c == NULL) {
634: log("channel_register_callback: %d: bad id", id);
635: return;
636: }
637: c->cb_event = mtype;
638: c->cb_fn = fn;
639: c->cb_arg = arg;
640: }
641: void
642: channel_register_cleanup(int id, channel_callback_fn *fn)
643: {
644: Channel *c = channel_lookup(id);
645: if (c == NULL) {
646: log("channel_register_cleanup: %d: bad id", id);
647: return;
648: }
1.131 markus 649: c->detach_user = fn;
1.121 markus 650: }
651: void
652: channel_cancel_cleanup(int id)
653: {
654: Channel *c = channel_lookup(id);
655: if (c == NULL) {
656: log("channel_cancel_cleanup: %d: bad id", id);
657: return;
1.52 markus 658: }
1.131 markus 659: c->detach_user = NULL;
1.121 markus 660: }
661: void
662: channel_register_filter(int id, channel_filter_fn *fn)
663: {
664: Channel *c = channel_lookup(id);
665: if (c == NULL) {
666: log("channel_register_filter: %d: bad id", id);
667: return;
1.52 markus 668: }
1.121 markus 669: c->input_filter = fn;
1.52 markus 670: }
671:
1.49 markus 672: void
1.121 markus 673: channel_set_fds(int id, int rfd, int wfd, int efd,
674: int extusage, int nonblock)
1.1 deraadt 675: {
1.121 markus 676: Channel *c = channel_lookup(id);
677: if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
678: fatal("channel_activate for non-larval channel %d.", id);
679: channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
680: c->type = SSH_CHANNEL_OPEN;
681: /* XXX window size? */
682: c->local_window = c->local_window_max = c->local_maxpacket * 2;
683: packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
684: packet_put_int(c->remote_id);
685: packet_put_int(c->local_window);
686: packet_send();
1.1 deraadt 687: }
688:
1.27 markus 689: /*
1.41 markus 690: * 'channel_pre*' are called just before select() to add any bits relevant to
691: * channels in the select bitmasks.
692: */
693: /*
694: * 'channel_post*': perform any appropriate operations for channels which
695: * have events pending.
1.27 markus 696: */
1.41 markus 697: typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset);
698: chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
699: chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
700:
1.127 itojun 701: static void
1.41 markus 702: channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
703: {
704: FD_SET(c->sock, readset);
705: }
706:
1.127 itojun 707: static void
1.75 markus 708: channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset)
709: {
710: debug3("channel %d: waiting for connection", c->self);
711: FD_SET(c->sock, writeset);
712: }
713:
1.127 itojun 714: static void
1.41 markus 715: channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
716: {
717: if (buffer_len(&c->input) < packet_get_maxsize())
718: FD_SET(c->sock, readset);
719: if (buffer_len(&c->output) > 0)
720: FD_SET(c->sock, writeset);
721: }
1.1 deraadt 722:
1.127 itojun 723: static void
1.41 markus 724: channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset)
725: {
726: /* test whether sockets are 'alive' for read/write */
727: if (c->istate == CHAN_INPUT_OPEN)
728: if (buffer_len(&c->input) < packet_get_maxsize())
729: FD_SET(c->sock, readset);
730: if (c->ostate == CHAN_OUTPUT_OPEN ||
731: c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
732: if (buffer_len(&c->output) > 0) {
733: FD_SET(c->sock, writeset);
734: } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
735: chan_obuf_empty(c);
736: }
737: }
738: }
739:
1.127 itojun 740: static void
1.44 markus 741: channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset)
742: {
743: if (c->istate == CHAN_INPUT_OPEN &&
744: c->remote_window > 0 &&
745: buffer_len(&c->input) < c->remote_window)
746: FD_SET(c->rfd, readset);
747: if (c->ostate == CHAN_OUTPUT_OPEN ||
748: c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
749: if (buffer_len(&c->output) > 0) {
750: FD_SET(c->wfd, writeset);
751: } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
752: chan_obuf_empty(c);
753: }
754: }
755: /** XXX check close conditions, too */
756: if (c->efd != -1) {
757: if (c->extended_usage == CHAN_EXTENDED_WRITE &&
758: buffer_len(&c->extended) > 0)
759: FD_SET(c->efd, writeset);
760: else if (c->extended_usage == CHAN_EXTENDED_READ &&
761: buffer_len(&c->extended) < c->remote_window)
762: FD_SET(c->efd, readset);
763: }
764: }
765:
1.127 itojun 766: static void
1.41 markus 767: channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
768: {
769: if (buffer_len(&c->input) == 0) {
770: packet_start(SSH_MSG_CHANNEL_CLOSE);
771: packet_put_int(c->remote_id);
772: packet_send();
773: c->type = SSH_CHANNEL_CLOSED;
1.105 markus 774: debug("channel %d: closing after input drain.", c->self);
1.41 markus 775: }
776: }
777:
1.127 itojun 778: static void
1.41 markus 779: channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
780: {
781: if (buffer_len(&c->output) == 0)
1.113 markus 782: chan_mark_dead(c);
1.49 markus 783: else
1.41 markus 784: FD_SET(c->sock, writeset);
785: }
786:
787: /*
788: * This is a special state for X11 authentication spoofing. An opened X11
789: * connection (when authentication spoofing is being done) remains in this
790: * state until the first packet has been completely read. The authentication
791: * data in that packet is then substituted by the real data if it matches the
792: * fake data, and the channel is put into normal mode.
1.51 markus 793: * XXX All this happens at the client side.
1.121 markus 794: * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
1.41 markus 795: */
1.127 itojun 796: static int
1.121 markus 797: x11_open_helper(Buffer *b)
1.1 deraadt 798: {
1.77 markus 799: u_char *ucp;
800: u_int proto_len, data_len;
1.25 markus 801:
1.41 markus 802: /* Check if the fixed size part of the packet is in buffer. */
1.121 markus 803: if (buffer_len(b) < 12)
1.41 markus 804: return 0;
805:
806: /* Parse the lengths of variable-length fields. */
1.121 markus 807: ucp = (u_char *) buffer_ptr(b);
1.41 markus 808: if (ucp[0] == 0x42) { /* Byte order MSB first. */
809: proto_len = 256 * ucp[6] + ucp[7];
810: data_len = 256 * ucp[8] + ucp[9];
811: } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
812: proto_len = ucp[6] + 256 * ucp[7];
813: data_len = ucp[8] + 256 * ucp[9];
814: } else {
815: debug("Initial X11 packet contains bad byte order byte: 0x%x",
816: ucp[0]);
817: return -1;
818: }
819:
820: /* Check if the whole packet is in buffer. */
1.121 markus 821: if (buffer_len(b) <
1.41 markus 822: 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
823: return 0;
824:
825: /* Check if authentication protocol matches. */
826: if (proto_len != strlen(x11_saved_proto) ||
827: memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
828: debug("X11 connection uses different authentication protocol.");
829: return -1;
830: }
831: /* Check if authentication data matches our fake data. */
832: if (data_len != x11_fake_data_len ||
833: memcmp(ucp + 12 + ((proto_len + 3) & ~3),
834: x11_fake_data, x11_fake_data_len) != 0) {
835: debug("X11 auth data does not match fake data.");
836: return -1;
837: }
838: /* Check fake data length */
839: if (x11_fake_data_len != x11_saved_data_len) {
840: error("X11 fake_data_len %d != saved_data_len %d",
841: x11_fake_data_len, x11_saved_data_len);
842: return -1;
843: }
844: /*
845: * Received authentication protocol and data match
846: * our fake data. Substitute the fake data with real
847: * data.
848: */
849: memcpy(ucp + 12 + ((proto_len + 3) & ~3),
850: x11_saved_data, x11_saved_data_len);
851: return 1;
852: }
853:
1.127 itojun 854: static void
1.41 markus 855: channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
856: {
1.121 markus 857: int ret = x11_open_helper(&c->output);
1.41 markus 858: if (ret == 1) {
859: /* Start normal processing for the channel. */
860: c->type = SSH_CHANNEL_OPEN;
1.47 markus 861: channel_pre_open_13(c, readset, writeset);
1.41 markus 862: } else if (ret == -1) {
863: /*
864: * We have received an X11 connection that has bad
865: * authentication information.
866: */
1.98 millert 867: log("X11 connection rejected because of wrong authentication.");
1.41 markus 868: buffer_clear(&c->input);
869: buffer_clear(&c->output);
1.132 markus 870: channel_close_fd(&c->sock);
1.41 markus 871: c->sock = -1;
872: c->type = SSH_CHANNEL_CLOSED;
873: packet_start(SSH_MSG_CHANNEL_CLOSE);
874: packet_put_int(c->remote_id);
875: packet_send();
876: }
877: }
1.25 markus 878:
1.127 itojun 879: static void
1.51 markus 880: channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
1.41 markus 881: {
1.121 markus 882: int ret = x11_open_helper(&c->output);
1.133 markus 883:
884: /* c->force_drain = 1; */
885:
1.41 markus 886: if (ret == 1) {
887: c->type = SSH_CHANNEL_OPEN;
1.57 markus 888: if (compat20)
889: channel_pre_open_20(c, readset, writeset);
890: else
891: channel_pre_open_15(c, readset, writeset);
1.41 markus 892: } else if (ret == -1) {
893: debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
1.51 markus 894: chan_read_failed(c); /** force close? */
1.41 markus 895: chan_write_failed(c);
896: debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
897: }
898: }
1.25 markus 899:
1.104 markus 900: /* try to decode a socks4 header */
1.127 itojun 901: static int
1.104 markus 902: channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
1.103 markus 903: {
904: u_char *p, *host;
1.109 markus 905: int len, have, i, found;
1.104 markus 906: char username[256];
1.103 markus 907: struct {
908: u_int8_t version;
909: u_int8_t command;
910: u_int16_t dest_port;
1.104 markus 911: struct in_addr dest_addr;
1.103 markus 912: } s4_req, s4_rsp;
913:
1.104 markus 914: debug2("channel %d: decode socks4", c->self);
1.109 markus 915:
916: have = buffer_len(&c->input);
917: len = sizeof(s4_req);
918: if (have < len)
919: return 0;
920: p = buffer_ptr(&c->input);
921: for (found = 0, i = len; i < have; i++) {
922: if (p[i] == '\0') {
923: found = 1;
924: break;
925: }
926: if (i > 1024) {
927: /* the peer is probably sending garbage */
928: debug("channel %d: decode socks4: too long",
929: c->self);
930: return -1;
931: }
932: }
933: if (!found)
934: return 0;
1.103 markus 935: buffer_get(&c->input, (char *)&s4_req.version, 1);
936: buffer_get(&c->input, (char *)&s4_req.command, 1);
937: buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
1.104 markus 938: buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
1.109 markus 939: have = buffer_len(&c->input);
1.103 markus 940: p = buffer_ptr(&c->input);
941: len = strlen(p);
1.106 markus 942: debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
1.103 markus 943: if (len > have)
1.104 markus 944: fatal("channel %d: decode socks4: len %d > have %d",
1.103 markus 945: c->self, len, have);
946: strlcpy(username, p, sizeof(username));
947: buffer_consume(&c->input, len);
948: buffer_consume(&c->input, 1); /* trailing '\0' */
949:
1.104 markus 950: host = inet_ntoa(s4_req.dest_addr);
1.103 markus 951: strlcpy(c->path, host, sizeof(c->path));
952: c->host_port = ntohs(s4_req.dest_port);
953:
1.106 markus 954: debug("channel %d: dynamic request: socks4 host %s port %u command %u",
955: c->self, host, c->host_port, s4_req.command);
1.103 markus 956:
1.104 markus 957: if (s4_req.command != 1) {
958: debug("channel %d: cannot handle: socks4 cn %d",
959: c->self, s4_req.command);
960: return -1;
1.103 markus 961: }
1.104 markus 962: s4_rsp.version = 0; /* vn: 0 for reply */
963: s4_rsp.command = 90; /* cd: req granted */
1.103 markus 964: s4_rsp.dest_port = 0; /* ignored */
1.104 markus 965: s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
1.103 markus 966: buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp));
1.104 markus 967: return 1;
968: }
969:
970: /* dynamic port forwarding */
1.127 itojun 971: static void
1.104 markus 972: channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
973: {
974: u_char *p;
975: int have, ret;
1.103 markus 976:
1.104 markus 977: have = buffer_len(&c->input);
1.137 ! markus 978: c->delayed = 0;
1.104 markus 979: debug2("channel %d: pre_dynamic: have %d", c->self, have);
1.105 markus 980: /* buffer_dump(&c->input); */
1.104 markus 981: /* check if the fixed size part of the packet is in buffer. */
982: if (have < 4) {
983: /* need more */
984: FD_SET(c->sock, readset);
985: return;
986: }
987: /* try to guess the protocol */
988: p = buffer_ptr(&c->input);
989: switch (p[0]) {
990: case 0x04:
991: ret = channel_decode_socks4(c, readset, writeset);
992: break;
993: default:
994: ret = -1;
995: break;
996: }
997: if (ret < 0) {
1.113 markus 998: chan_mark_dead(c);
1.104 markus 999: } else if (ret == 0) {
1000: debug2("channel %d: pre_dynamic: need more", c->self);
1001: /* need more */
1002: FD_SET(c->sock, readset);
1003: } else {
1004: /* switch to the next state */
1005: c->type = SSH_CHANNEL_OPENING;
1006: port_open_helper(c, "direct-tcpip");
1007: }
1.103 markus 1008: }
1009:
1.41 markus 1010: /* This is our fake X11 server socket. */
1.127 itojun 1011: static void
1.41 markus 1012: channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
1013: {
1.113 markus 1014: Channel *nc;
1.41 markus 1015: struct sockaddr addr;
1.113 markus 1016: int newsock;
1.41 markus 1017: socklen_t addrlen;
1.85 markus 1018: char buf[16384], *remote_ipaddr;
1.51 markus 1019: int remote_port;
1.25 markus 1020:
1.41 markus 1021: if (FD_ISSET(c->sock, readset)) {
1022: debug("X11 connection requested.");
1023: addrlen = sizeof(addr);
1024: newsock = accept(c->sock, &addr, &addrlen);
1025: if (newsock < 0) {
1026: error("accept: %.100s", strerror(errno));
1027: return;
1028: }
1.85 markus 1029: remote_ipaddr = get_peer_ipaddr(newsock);
1.51 markus 1030: remote_port = get_peer_port(newsock);
1.41 markus 1031: snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
1.85 markus 1032: remote_ipaddr, remote_port);
1.51 markus 1033:
1.113 markus 1034: nc = channel_new("accepted x11 socket",
1.51 markus 1035: SSH_CHANNEL_OPENING, newsock, newsock, -1,
1036: c->local_window_max, c->local_maxpacket,
1.71 markus 1037: 0, xstrdup(buf), 1);
1.113 markus 1038: if (nc == NULL) {
1039: close(newsock);
1040: xfree(remote_ipaddr);
1041: return;
1042: }
1.51 markus 1043: if (compat20) {
1044: packet_start(SSH2_MSG_CHANNEL_OPEN);
1045: packet_put_cstring("x11");
1.113 markus 1046: packet_put_int(nc->self);
1.51 markus 1047: packet_put_int(c->local_window_max);
1048: packet_put_int(c->local_maxpacket);
1.85 markus 1049: /* originator ipaddr and port */
1050: packet_put_cstring(remote_ipaddr);
1.57 markus 1051: if (datafellows & SSH_BUG_X11FWD) {
1052: debug("ssh2 x11 bug compat mode");
1053: } else {
1054: packet_put_int(remote_port);
1055: }
1.51 markus 1056: packet_send();
1057: } else {
1058: packet_start(SSH_SMSG_X11_OPEN);
1.113 markus 1059: packet_put_int(nc->self);
1.121 markus 1060: if (packet_get_protocol_flags() &
1061: SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
1.125 markus 1062: packet_put_cstring(buf);
1.51 markus 1063: packet_send();
1064: }
1.85 markus 1065: xfree(remote_ipaddr);
1.41 markus 1066: }
1067: }
1.25 markus 1068:
1.127 itojun 1069: static void
1.103 markus 1070: port_open_helper(Channel *c, char *rtype)
1071: {
1072: int direct;
1073: char buf[1024];
1074: char *remote_ipaddr = get_peer_ipaddr(c->sock);
1075: u_short remote_port = get_peer_port(c->sock);
1076:
1077: direct = (strcmp(rtype, "direct-tcpip") == 0);
1078:
1079: snprintf(buf, sizeof buf,
1080: "%s: listening port %d for %.100s port %d, "
1081: "connect from %.200s port %d",
1082: rtype, c->listening_port, c->path, c->host_port,
1083: remote_ipaddr, remote_port);
1084:
1085: xfree(c->remote_name);
1086: c->remote_name = xstrdup(buf);
1087:
1088: if (compat20) {
1089: packet_start(SSH2_MSG_CHANNEL_OPEN);
1090: packet_put_cstring(rtype);
1091: packet_put_int(c->self);
1092: packet_put_int(c->local_window_max);
1093: packet_put_int(c->local_maxpacket);
1094: if (direct) {
1095: /* target host, port */
1096: packet_put_cstring(c->path);
1097: packet_put_int(c->host_port);
1098: } else {
1099: /* listen address, port */
1100: packet_put_cstring(c->path);
1101: packet_put_int(c->listening_port);
1102: }
1103: /* originator host and port */
1104: packet_put_cstring(remote_ipaddr);
1105: packet_put_int(remote_port);
1106: packet_send();
1107: } else {
1108: packet_start(SSH_MSG_PORT_OPEN);
1109: packet_put_int(c->self);
1110: packet_put_cstring(c->path);
1111: packet_put_int(c->host_port);
1.121 markus 1112: if (packet_get_protocol_flags() &
1113: SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
1.103 markus 1114: packet_put_cstring(c->remote_name);
1115: packet_send();
1116: }
1117: xfree(remote_ipaddr);
1118: }
1119:
1.41 markus 1120: /*
1121: * This socket is listening for connections to a forwarded TCP/IP port.
1122: */
1.127 itojun 1123: static void
1.41 markus 1124: channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
1125: {
1.103 markus 1126: Channel *nc;
1.41 markus 1127: struct sockaddr addr;
1.113 markus 1128: int newsock, nextstate;
1.41 markus 1129: socklen_t addrlen;
1.103 markus 1130: char *rtype;
1.73 markus 1131:
1.41 markus 1132: if (FD_ISSET(c->sock, readset)) {
1133: debug("Connection to port %d forwarding "
1134: "to %.100s port %d requested.",
1135: c->listening_port, c->path, c->host_port);
1.103 markus 1136:
1.137 ! markus 1137: if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
! 1138: nextstate = SSH_CHANNEL_OPENING;
! 1139: rtype = "forwarded-tcpip";
! 1140: } else {
! 1141: if (c->host_port == 0) {
! 1142: nextstate = SSH_CHANNEL_DYNAMIC;
! 1143: rtype = "direct-tcpip";
! 1144: } else {
! 1145: nextstate = SSH_CHANNEL_OPENING;
! 1146: rtype = "direct-tcpip";
! 1147: }
! 1148: }
1.103 markus 1149:
1.41 markus 1150: addrlen = sizeof(addr);
1151: newsock = accept(c->sock, &addr, &addrlen);
1152: if (newsock < 0) {
1153: error("accept: %.100s", strerror(errno));
1154: return;
1155: }
1.113 markus 1156: nc = channel_new(rtype,
1.103 markus 1157: nextstate, newsock, newsock, -1,
1.41 markus 1158: c->local_window_max, c->local_maxpacket,
1.103 markus 1159: 0, xstrdup(rtype), 1);
1160: if (nc == NULL) {
1.113 markus 1161: error("channel_post_port_listener: no new channel:");
1162: close(newsock);
1.103 markus 1163: return;
1.41 markus 1164: }
1.103 markus 1165: nc->listening_port = c->listening_port;
1166: nc->host_port = c->host_port;
1167: strlcpy(nc->path, c->path, sizeof(nc->path));
1168:
1.137 ! markus 1169: if (nextstate == SSH_CHANNEL_DYNAMIC) {
! 1170: /*
! 1171: * do not call the channel_post handler until
! 1172: * this flag has been reset by a pre-handler.
! 1173: * otherwise the FD_ISSET calls might overflow
! 1174: */
! 1175: nc->delayed = 1;
! 1176: } else {
1.103 markus 1177: port_open_helper(nc, rtype);
1.137 ! markus 1178: }
1.41 markus 1179: }
1180: }
1.25 markus 1181:
1.41 markus 1182: /*
1183: * This is the authentication agent socket listening for connections from
1184: * clients.
1185: */
1.127 itojun 1186: static void
1.41 markus 1187: channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
1188: {
1.113 markus 1189: Channel *nc;
1.121 markus 1190: char *name;
1.113 markus 1191: int newsock;
1.41 markus 1192: struct sockaddr addr;
1193: socklen_t addrlen;
1.25 markus 1194:
1.41 markus 1195: if (FD_ISSET(c->sock, readset)) {
1196: addrlen = sizeof(addr);
1197: newsock = accept(c->sock, &addr, &addrlen);
1198: if (newsock < 0) {
1199: error("accept from auth socket: %.100s", strerror(errno));
1200: return;
1201: }
1.121 markus 1202: name = xstrdup("accepted auth socket");
1.113 markus 1203: nc = channel_new("accepted auth socket",
1.73 markus 1204: SSH_CHANNEL_OPENING, newsock, newsock, -1,
1205: c->local_window_max, c->local_maxpacket,
1.121 markus 1206: 0, name, 1);
1.113 markus 1207: if (nc == NULL) {
1208: error("channel_post_auth_listener: channel_new failed");
1.121 markus 1209: xfree(name);
1.113 markus 1210: close(newsock);
1211: }
1.73 markus 1212: if (compat20) {
1213: packet_start(SSH2_MSG_CHANNEL_OPEN);
1214: packet_put_cstring("auth-agent@openssh.com");
1.113 markus 1215: packet_put_int(nc->self);
1.73 markus 1216: packet_put_int(c->local_window_max);
1217: packet_put_int(c->local_maxpacket);
1218: } else {
1219: packet_start(SSH_SMSG_AGENT_OPEN);
1.113 markus 1220: packet_put_int(nc->self);
1.73 markus 1221: }
1.41 markus 1222: packet_send();
1223: }
1224: }
1.25 markus 1225:
1.127 itojun 1226: static void
1.75 markus 1227: channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
1228: {
1.114 markus 1229: int err = 0;
1.129 stevesk 1230: socklen_t sz = sizeof(err);
1.114 markus 1231:
1.75 markus 1232: if (FD_ISSET(c->sock, writeset)) {
1.114 markus 1233: if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err,
1234: &sz) < 0) {
1235: err = errno;
1236: error("getsockopt SO_ERROR failed");
1237: }
1238: if (err == 0) {
1239: debug("channel %d: connected", c->self);
1240: c->type = SSH_CHANNEL_OPEN;
1241: if (compat20) {
1242: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1243: packet_put_int(c->remote_id);
1244: packet_put_int(c->self);
1245: packet_put_int(c->local_window);
1246: packet_put_int(c->local_maxpacket);
1247: } else {
1248: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1249: packet_put_int(c->remote_id);
1250: packet_put_int(c->self);
1251: }
1.75 markus 1252: } else {
1.114 markus 1253: debug("channel %d: not connected: %s",
1254: c->self, strerror(err));
1255: if (compat20) {
1256: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1257: packet_put_int(c->remote_id);
1258: packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1259: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1260: packet_put_cstring(strerror(err));
1261: packet_put_cstring("");
1262: }
1.75 markus 1263: } else {
1.114 markus 1264: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1265: packet_put_int(c->remote_id);
1.75 markus 1266: }
1.114 markus 1267: chan_mark_dead(c);
1.75 markus 1268: }
1.114 markus 1269: packet_send();
1.75 markus 1270: }
1271: }
1272:
1.127 itojun 1273: static int
1.41 markus 1274: channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
1275: {
1276: char buf[16*1024];
1277: int len;
1.25 markus 1278:
1.118 markus 1279: if (c->rfd != -1 &&
1.41 markus 1280: FD_ISSET(c->rfd, readset)) {
1281: len = read(c->rfd, buf, sizeof(buf));
1.53 markus 1282: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1283: return 1;
1.41 markus 1284: if (len <= 0) {
1.51 markus 1285: debug("channel %d: read<=0 rfd %d len %d",
1.41 markus 1286: c->self, c->rfd, len);
1.104 markus 1287: if (c->type != SSH_CHANNEL_OPEN) {
1288: debug("channel %d: not open", c->self);
1.113 markus 1289: chan_mark_dead(c);
1.103 markus 1290: return -1;
1.104 markus 1291: } else if (compat13) {
1.41 markus 1292: buffer_consume(&c->output, buffer_len(&c->output));
1293: c->type = SSH_CHANNEL_INPUT_DRAINING;
1.121 markus 1294: debug("channel %d: input draining.", c->self);
1.25 markus 1295: } else {
1.41 markus 1296: chan_read_failed(c);
1.25 markus 1297: }
1.41 markus 1298: return -1;
1299: }
1.65 markus 1300: if(c->input_filter != NULL) {
1.66 markus 1301: if (c->input_filter(c, buf, len) == -1) {
1.105 markus 1302: debug("channel %d: filter stops", c->self);
1.65 markus 1303: chan_read_failed(c);
1304: }
1305: } else {
1306: buffer_append(&c->input, buf, len);
1307: }
1.41 markus 1308: }
1309: return 1;
1310: }
1.127 itojun 1311: static int
1.41 markus 1312: channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
1313: {
1.95 markus 1314: struct termios tio;
1.134 markus 1315: u_char *data;
1316: u_int dlen;
1.41 markus 1317: int len;
1.25 markus 1318:
1.41 markus 1319: /* Send buffered output data to the socket. */
1.118 markus 1320: if (c->wfd != -1 &&
1.41 markus 1321: FD_ISSET(c->wfd, writeset) &&
1322: buffer_len(&c->output) > 0) {
1.134 markus 1323: data = buffer_ptr(&c->output);
1324: dlen = buffer_len(&c->output);
1325: len = write(c->wfd, data, dlen);
1.53 markus 1326: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1327: return 1;
1.41 markus 1328: if (len <= 0) {
1.104 markus 1329: if (c->type != SSH_CHANNEL_OPEN) {
1330: debug("channel %d: not open", c->self);
1.113 markus 1331: chan_mark_dead(c);
1.104 markus 1332: return -1;
1333: } else if (compat13) {
1.41 markus 1334: buffer_consume(&c->output, buffer_len(&c->output));
1.121 markus 1335: debug("channel %d: input draining.", c->self);
1.41 markus 1336: c->type = SSH_CHANNEL_INPUT_DRAINING;
1337: } else {
1338: chan_write_failed(c);
1339: }
1340: return -1;
1.91 markus 1341: }
1.134 markus 1342: if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') {
1.91 markus 1343: if (tcgetattr(c->wfd, &tio) == 0 &&
1344: !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1345: /*
1346: * Simulate echo to reduce the impact of
1.96 markus 1347: * traffic analysis. We need to match the
1.95 markus 1348: * size of a SSH2_MSG_CHANNEL_DATA message
1349: * (4 byte channel id + data)
1.91 markus 1350: */
1.95 markus 1351: packet_send_ignore(4 + len);
1.91 markus 1352: packet_send();
1353: }
1.25 markus 1354: }
1.41 markus 1355: buffer_consume(&c->output, len);
1.44 markus 1356: if (compat20 && len > 0) {
1357: c->local_consumed += len;
1358: }
1359: }
1360: return 1;
1361: }
1.127 itojun 1362: static int
1.44 markus 1363: channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
1364: {
1365: char buf[16*1024];
1366: int len;
1367:
1.45 markus 1368: /** XXX handle drain efd, too */
1.44 markus 1369: if (c->efd != -1) {
1370: if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1371: FD_ISSET(c->efd, writeset) &&
1372: buffer_len(&c->extended) > 0) {
1373: len = write(c->efd, buffer_ptr(&c->extended),
1374: buffer_len(&c->extended));
1.70 markus 1375: debug2("channel %d: written %d to efd %d",
1.44 markus 1376: c->self, len, c->efd);
1.93 markus 1377: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1378: return 1;
1379: if (len <= 0) {
1380: debug2("channel %d: closing write-efd %d",
1381: c->self, c->efd);
1.132 markus 1382: channel_close_fd(&c->efd);
1.93 markus 1383: } else {
1.44 markus 1384: buffer_consume(&c->extended, len);
1385: c->local_consumed += len;
1386: }
1387: } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1388: FD_ISSET(c->efd, readset)) {
1389: len = read(c->efd, buf, sizeof(buf));
1.70 markus 1390: debug2("channel %d: read %d from efd %d",
1.44 markus 1391: c->self, len, c->efd);
1.93 markus 1392: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1393: return 1;
1394: if (len <= 0) {
1395: debug2("channel %d: closing read-efd %d",
1.45 markus 1396: c->self, c->efd);
1.132 markus 1397: channel_close_fd(&c->efd);
1.93 markus 1398: } else {
1.44 markus 1399: buffer_append(&c->extended, buf, len);
1.93 markus 1400: }
1.44 markus 1401: }
1402: }
1403: return 1;
1404: }
1.127 itojun 1405: static int
1.93 markus 1406: channel_check_window(Channel *c)
1.44 markus 1407: {
1.104 markus 1408: if (c->type == SSH_CHANNEL_OPEN &&
1409: !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
1.44 markus 1410: c->local_window < c->local_window_max/2 &&
1411: c->local_consumed > 0) {
1412: packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1413: packet_put_int(c->remote_id);
1414: packet_put_int(c->local_consumed);
1415: packet_send();
1.70 markus 1416: debug2("channel %d: window %d sent adjust %d",
1.44 markus 1417: c->self, c->local_window,
1418: c->local_consumed);
1419: c->local_window += c->local_consumed;
1420: c->local_consumed = 0;
1.1 deraadt 1421: }
1.41 markus 1422: return 1;
1.1 deraadt 1423: }
1424:
1.127 itojun 1425: static void
1.41 markus 1426: channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset)
1427: {
1.137 ! markus 1428: if (c->delayed)
! 1429: return;
1.41 markus 1430: channel_handle_rfd(c, readset, writeset);
1431: channel_handle_wfd(c, readset, writeset);
1432: }
1.1 deraadt 1433:
1.127 itojun 1434: static void
1.44 markus 1435: channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset)
1436: {
1.137 ! markus 1437: if (c->delayed)
! 1438: return;
1.44 markus 1439: channel_handle_rfd(c, readset, writeset);
1440: channel_handle_wfd(c, readset, writeset);
1441: channel_handle_efd(c, readset, writeset);
1.93 markus 1442:
1443: channel_check_window(c);
1.44 markus 1444: }
1445:
1.127 itojun 1446: static void
1.41 markus 1447: channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
1.1 deraadt 1448: {
1.41 markus 1449: int len;
1450: /* Send buffered output data to the socket. */
1451: if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1452: len = write(c->sock, buffer_ptr(&c->output),
1453: buffer_len(&c->output));
1454: if (len <= 0)
1455: buffer_consume(&c->output, buffer_len(&c->output));
1456: else
1457: buffer_consume(&c->output, len);
1458: }
1459: }
1.25 markus 1460:
1.127 itojun 1461: static void
1.44 markus 1462: channel_handler_init_20(void)
1463: {
1464: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20;
1.51 markus 1465: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
1.44 markus 1466: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1.73 markus 1467: channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
1.51 markus 1468: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1.73 markus 1469: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1.75 markus 1470: channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
1.103 markus 1471: channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.44 markus 1472:
1473: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2;
1474: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1.73 markus 1475: channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
1.51 markus 1476: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1.73 markus 1477: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1.75 markus 1478: channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
1.104 markus 1479: channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_2;
1.44 markus 1480: }
1481:
1.127 itojun 1482: static void
1.41 markus 1483: channel_handler_init_13(void)
1484: {
1485: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1486: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1487: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1488: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1489: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1490: channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1491: channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
1.75 markus 1492: channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
1.103 markus 1493: channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.25 markus 1494:
1.41 markus 1495: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
1496: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1497: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1498: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1499: channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
1.75 markus 1500: channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
1.104 markus 1501: channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1;
1.41 markus 1502: }
1.25 markus 1503:
1.127 itojun 1504: static void
1.41 markus 1505: channel_handler_init_15(void)
1506: {
1507: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15;
1.51 markus 1508: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
1.41 markus 1509: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1510: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1511: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1.75 markus 1512: channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
1.103 markus 1513: channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.25 markus 1514:
1.41 markus 1515: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1516: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1517: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1518: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
1.75 markus 1519: channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
1.104 markus 1520: channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1;
1.41 markus 1521: }
1.27 markus 1522:
1.127 itojun 1523: static void
1.41 markus 1524: channel_handler_init(void)
1525: {
1526: int i;
1527: for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
1528: channel_pre[i] = NULL;
1529: channel_post[i] = NULL;
1530: }
1.44 markus 1531: if (compat20)
1532: channel_handler_init_20();
1533: else if (compat13)
1.41 markus 1534: channel_handler_init_13();
1535: else
1536: channel_handler_init_15();
1537: }
1.25 markus 1538:
1.127 itojun 1539: static void
1.41 markus 1540: channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
1541: {
1542: static int did_init = 0;
1543: int i;
1544: Channel *c;
1.25 markus 1545:
1.41 markus 1546: if (!did_init) {
1547: channel_handler_init();
1548: did_init = 1;
1549: }
1550: for (i = 0; i < channels_alloc; i++) {
1.113 markus 1551: c = channels[i];
1552: if (c == NULL)
1.41 markus 1553: continue;
1.118 markus 1554: if (ftab[c->type] != NULL)
1555: (*ftab[c->type])(c, readset, writeset);
1.93 markus 1556: if (chan_is_dead(c)) {
1557: /*
1558: * we have to remove the fd's from the select mask
1559: * before the channels are free'd and the fd's are
1560: * closed
1561: */
1562: if (c->wfd != -1)
1563: FD_CLR(c->wfd, writeset);
1564: if (c->rfd != -1)
1565: FD_CLR(c->rfd, readset);
1566: if (c->efd != -1) {
1567: if (c->extended_usage == CHAN_EXTENDED_READ)
1568: FD_CLR(c->efd, readset);
1569: if (c->extended_usage == CHAN_EXTENDED_WRITE)
1570: FD_CLR(c->efd, writeset);
1571: }
1.113 markus 1572: channel_free(c);
1.93 markus 1573: }
1.1 deraadt 1574: }
1575: }
1576:
1.121 markus 1577: /*
1578: * Allocate/update select bitmasks and add any bits relevant to channels in
1579: * select bitmasks.
1580: */
1.49 markus 1581: void
1.100 markus 1582: channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
1.132 markus 1583: int *nallocp, int rekeying)
1.41 markus 1584: {
1.84 markus 1585: int n;
1586: u_int sz;
1587:
1588: n = MAX(*maxfdp, channel_max_fd);
1589:
1590: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.132 markus 1591: /* perhaps check sz < nalloc/2 and shrink? */
1592: if (*readsetp == NULL || sz > *nallocp) {
1593: *readsetp = xrealloc(*readsetp, sz);
1594: *writesetp = xrealloc(*writesetp, sz);
1595: *nallocp = sz;
1.84 markus 1596: }
1.132 markus 1597: *maxfdp = n;
1.84 markus 1598: memset(*readsetp, 0, sz);
1599: memset(*writesetp, 0, sz);
1600:
1.100 markus 1601: if (!rekeying)
1602: channel_handler(channel_pre, *readsetp, *writesetp);
1.41 markus 1603: }
1604:
1.121 markus 1605: /*
1606: * After select, perform any appropriate operations for channels which have
1607: * events pending.
1608: */
1.49 markus 1609: void
1.41 markus 1610: channel_after_select(fd_set * readset, fd_set * writeset)
1611: {
1612: channel_handler(channel_post, readset, writeset);
1613: }
1614:
1.121 markus 1615:
1.84 markus 1616: /* If there is data to send to the connection, enqueue some of it now. */
1.1 deraadt 1617:
1.49 markus 1618: void
1.25 markus 1619: channel_output_poll()
1.1 deraadt 1620: {
1.25 markus 1621: int len, i;
1.41 markus 1622: Channel *c;
1.1 deraadt 1623:
1.25 markus 1624: for (i = 0; i < channels_alloc; i++) {
1.113 markus 1625: c = channels[i];
1626: if (c == NULL)
1627: continue;
1.37 markus 1628:
1.121 markus 1629: /*
1630: * We are only interested in channels that can have buffered
1631: * incoming data.
1632: */
1.37 markus 1633: if (compat13) {
1.41 markus 1634: if (c->type != SSH_CHANNEL_OPEN &&
1635: c->type != SSH_CHANNEL_INPUT_DRAINING)
1.37 markus 1636: continue;
1637: } else {
1.41 markus 1638: if (c->type != SSH_CHANNEL_OPEN)
1.37 markus 1639: continue;
1640: }
1.46 markus 1641: if (compat20 &&
1642: (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
1.93 markus 1643: /* XXX is this true? */
1.97 markus 1644: debug2("channel %d: no data after CLOSE", c->self);
1.44 markus 1645: continue;
1646: }
1.25 markus 1647:
1648: /* Get the amount of buffered data for this channel. */
1.93 markus 1649: if ((c->istate == CHAN_INPUT_OPEN ||
1650: c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1651: (len = buffer_len(&c->input)) > 0) {
1.121 markus 1652: /*
1653: * Send some data for the other side over the secure
1654: * connection.
1655: */
1.44 markus 1656: if (compat20) {
1657: if (len > c->remote_window)
1658: len = c->remote_window;
1659: if (len > c->remote_maxpacket)
1660: len = c->remote_maxpacket;
1.25 markus 1661: } else {
1.44 markus 1662: if (packet_is_interactive()) {
1663: if (len > 1024)
1664: len = 512;
1665: } else {
1666: /* Keep the packets at reasonable size. */
1667: if (len > packet_get_maxsize()/2)
1668: len = packet_get_maxsize()/2;
1669: }
1.25 markus 1670: }
1.41 markus 1671: if (len > 0) {
1.44 markus 1672: packet_start(compat20 ?
1673: SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
1.41 markus 1674: packet_put_int(c->remote_id);
1675: packet_put_string(buffer_ptr(&c->input), len);
1676: packet_send();
1677: buffer_consume(&c->input, len);
1678: c->remote_window -= len;
1679: }
1680: } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
1.25 markus 1681: if (compat13)
1682: fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
1.27 markus 1683: /*
1684: * input-buffer is empty and read-socket shutdown:
1685: * tell peer, that we will not send more data: send IEOF
1686: */
1.41 markus 1687: chan_ibuf_empty(c);
1.25 markus 1688: }
1.44 markus 1689: /* Send extended data, i.e. stderr */
1690: if (compat20 &&
1691: c->remote_window > 0 &&
1692: (len = buffer_len(&c->extended)) > 0 &&
1693: c->extended_usage == CHAN_EXTENDED_READ) {
1.93 markus 1694: debug2("channel %d: rwin %d elen %d euse %d",
1695: c->self, c->remote_window, buffer_len(&c->extended),
1696: c->extended_usage);
1.44 markus 1697: if (len > c->remote_window)
1698: len = c->remote_window;
1699: if (len > c->remote_maxpacket)
1700: len = c->remote_maxpacket;
1701: packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1702: packet_put_int(c->remote_id);
1703: packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1704: packet_put_string(buffer_ptr(&c->extended), len);
1705: packet_send();
1706: buffer_consume(&c->extended, len);
1707: c->remote_window -= len;
1.93 markus 1708: debug2("channel %d: sent ext data %d", c->self, len);
1.44 markus 1709: }
1.25 markus 1710: }
1.1 deraadt 1711: }
1712:
1.121 markus 1713:
1714: /* -- protocol input */
1.1 deraadt 1715:
1.49 markus 1716: void
1.69 markus 1717: channel_input_data(int type, int plen, void *ctxt)
1.1 deraadt 1718: {
1.37 markus 1719: int id;
1.25 markus 1720: char *data;
1.77 markus 1721: u_int data_len;
1.41 markus 1722: Channel *c;
1.25 markus 1723:
1724: /* Get the channel number and verify it. */
1.37 markus 1725: id = packet_get_int();
1.41 markus 1726: c = channel_lookup(id);
1727: if (c == NULL)
1.37 markus 1728: packet_disconnect("Received data for nonexistent channel %d.", id);
1.25 markus 1729:
1730: /* Ignore any data for non-open channels (might happen on close) */
1.41 markus 1731: if (c->type != SSH_CHANNEL_OPEN &&
1732: c->type != SSH_CHANNEL_X11_OPEN)
1.37 markus 1733: return;
1734:
1735: /* same for protocol 1.5 if output end is no longer open */
1.41 markus 1736: if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN)
1.25 markus 1737: return;
1738:
1739: /* Get the data. */
1740: data = packet_get_string(&data_len);
1.48 markus 1741: packet_done();
1.41 markus 1742:
1.44 markus 1743: if (compat20){
1744: if (data_len > c->local_maxpacket) {
1745: log("channel %d: rcvd big packet %d, maxpack %d",
1746: c->self, data_len, c->local_maxpacket);
1747: }
1748: if (data_len > c->local_window) {
1749: log("channel %d: rcvd too much data %d, win %d",
1750: c->self, data_len, c->local_window);
1751: xfree(data);
1752: return;
1753: }
1754: c->local_window -= data_len;
1755: }else{
1756: packet_integrity_check(plen, 4 + 4 + data_len, type);
1757: }
1.41 markus 1758: buffer_append(&c->output, data, data_len);
1.25 markus 1759: xfree(data);
1.1 deraadt 1760: }
1.121 markus 1761:
1.49 markus 1762: void
1.69 markus 1763: channel_input_extended_data(int type, int plen, void *ctxt)
1.44 markus 1764: {
1765: int id;
1766: int tcode;
1767: char *data;
1.77 markus 1768: u_int data_len;
1.44 markus 1769: Channel *c;
1770:
1771: /* Get the channel number and verify it. */
1772: id = packet_get_int();
1773: c = channel_lookup(id);
1774:
1775: if (c == NULL)
1776: packet_disconnect("Received extended_data for bad channel %d.", id);
1777: if (c->type != SSH_CHANNEL_OPEN) {
1778: log("channel %d: ext data for non open", id);
1779: return;
1780: }
1781: tcode = packet_get_int();
1782: if (c->efd == -1 ||
1783: c->extended_usage != CHAN_EXTENDED_WRITE ||
1784: tcode != SSH2_EXTENDED_DATA_STDERR) {
1785: log("channel %d: bad ext data", c->self);
1786: return;
1787: }
1788: data = packet_get_string(&data_len);
1.48 markus 1789: packet_done();
1.44 markus 1790: if (data_len > c->local_window) {
1791: log("channel %d: rcvd too much extended_data %d, win %d",
1792: c->self, data_len, c->local_window);
1793: xfree(data);
1794: return;
1795: }
1.70 markus 1796: debug2("channel %d: rcvd ext data %d", c->self, data_len);
1.44 markus 1797: c->local_window -= data_len;
1798: buffer_append(&c->extended, data, data_len);
1799: xfree(data);
1800: }
1801:
1.49 markus 1802: void
1.69 markus 1803: channel_input_ieof(int type, int plen, void *ctxt)
1.41 markus 1804: {
1805: int id;
1806: Channel *c;
1807:
1808: packet_integrity_check(plen, 4, type);
1809:
1810: id = packet_get_int();
1811: c = channel_lookup(id);
1812: if (c == NULL)
1813: packet_disconnect("Received ieof for nonexistent channel %d.", id);
1814: chan_rcvd_ieof(c);
1.133 markus 1815:
1816: /* XXX force input close */
1817: if (c->force_drain) {
1818: debug("channel %d: FORCE input drain", c->self);
1819: c->istate = CHAN_INPUT_WAIT_DRAIN;
1820: }
1821:
1.41 markus 1822: }
1.1 deraadt 1823:
1.49 markus 1824: void
1.69 markus 1825: channel_input_close(int type, int plen, void *ctxt)
1.1 deraadt 1826: {
1.41 markus 1827: int id;
1828: Channel *c;
1.1 deraadt 1829:
1.41 markus 1830: packet_integrity_check(plen, 4, type);
1831:
1832: id = packet_get_int();
1833: c = channel_lookup(id);
1834: if (c == NULL)
1835: packet_disconnect("Received close for nonexistent channel %d.", id);
1.27 markus 1836:
1837: /*
1838: * Send a confirmation that we have closed the channel and no more
1839: * data is coming for it.
1840: */
1.25 markus 1841: packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
1.41 markus 1842: packet_put_int(c->remote_id);
1.25 markus 1843: packet_send();
1844:
1.27 markus 1845: /*
1846: * If the channel is in closed state, we have sent a close request,
1847: * and the other side will eventually respond with a confirmation.
1848: * Thus, we cannot free the channel here, because then there would be
1849: * no-one to receive the confirmation. The channel gets freed when
1850: * the confirmation arrives.
1851: */
1.41 markus 1852: if (c->type != SSH_CHANNEL_CLOSED) {
1.27 markus 1853: /*
1854: * Not a closed channel - mark it as draining, which will
1855: * cause it to be freed later.
1856: */
1.41 markus 1857: buffer_consume(&c->input, buffer_len(&c->input));
1858: c->type = SSH_CHANNEL_OUTPUT_DRAINING;
1.25 markus 1859: }
1.1 deraadt 1860: }
1861:
1.41 markus 1862: /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
1.49 markus 1863: void
1.69 markus 1864: channel_input_oclose(int type, int plen, void *ctxt)
1.41 markus 1865: {
1866: int id = packet_get_int();
1867: Channel *c = channel_lookup(id);
1868: packet_integrity_check(plen, 4, type);
1869: if (c == NULL)
1870: packet_disconnect("Received oclose for nonexistent channel %d.", id);
1871: chan_rcvd_oclose(c);
1872: }
1.1 deraadt 1873:
1.49 markus 1874: void
1.69 markus 1875: channel_input_close_confirmation(int type, int plen, void *ctxt)
1.1 deraadt 1876: {
1.41 markus 1877: int id = packet_get_int();
1878: Channel *c = channel_lookup(id);
1.1 deraadt 1879:
1.48 markus 1880: packet_done();
1.41 markus 1881: if (c == NULL)
1882: packet_disconnect("Received close confirmation for "
1883: "out-of-range channel %d.", id);
1884: if (c->type != SSH_CHANNEL_CLOSED)
1885: packet_disconnect("Received close confirmation for "
1886: "non-closed channel %d (type %d).", id, c->type);
1.113 markus 1887: channel_free(c);
1.1 deraadt 1888: }
1889:
1.49 markus 1890: void
1.69 markus 1891: channel_input_open_confirmation(int type, int plen, void *ctxt)
1.1 deraadt 1892: {
1.41 markus 1893: int id, remote_id;
1894: Channel *c;
1.1 deraadt 1895:
1.44 markus 1896: if (!compat20)
1897: packet_integrity_check(plen, 4 + 4, type);
1.25 markus 1898:
1.41 markus 1899: id = packet_get_int();
1900: c = channel_lookup(id);
1.25 markus 1901:
1.41 markus 1902: if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1903: packet_disconnect("Received open confirmation for "
1904: "non-opening channel %d.", id);
1905: remote_id = packet_get_int();
1.27 markus 1906: /* Record the remote channel number and mark that the channel is now open. */
1.41 markus 1907: c->remote_id = remote_id;
1908: c->type = SSH_CHANNEL_OPEN;
1.44 markus 1909:
1910: if (compat20) {
1911: c->remote_window = packet_get_int();
1912: c->remote_maxpacket = packet_get_int();
1.48 markus 1913: packet_done();
1.44 markus 1914: if (c->cb_fn != NULL && c->cb_event == type) {
1.70 markus 1915: debug2("callback start");
1.44 markus 1916: c->cb_fn(c->self, c->cb_arg);
1.70 markus 1917: debug2("callback done");
1.44 markus 1918: }
1919: debug("channel %d: open confirm rwindow %d rmax %d", c->self,
1920: c->remote_window, c->remote_maxpacket);
1921: }
1.1 deraadt 1922: }
1923:
1.127 itojun 1924: static char *
1.114 markus 1925: reason2txt(int reason)
1926: {
1927: switch(reason) {
1928: case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
1929: return "administratively prohibited";
1930: case SSH2_OPEN_CONNECT_FAILED:
1931: return "connect failed";
1932: case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
1933: return "unknown channel type";
1934: case SSH2_OPEN_RESOURCE_SHORTAGE:
1935: return "resource shortage";
1936: }
1.117 stevesk 1937: return "unknown reason";
1.114 markus 1938: }
1939:
1.49 markus 1940: void
1.69 markus 1941: channel_input_open_failure(int type, int plen, void *ctxt)
1.1 deraadt 1942: {
1.86 markus 1943: int id, reason;
1944: char *msg = NULL, *lang = NULL;
1.41 markus 1945: Channel *c;
1946:
1.44 markus 1947: if (!compat20)
1948: packet_integrity_check(plen, 4, type);
1.41 markus 1949:
1950: id = packet_get_int();
1951: c = channel_lookup(id);
1.25 markus 1952:
1.41 markus 1953: if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1954: packet_disconnect("Received open failure for "
1955: "non-opening channel %d.", id);
1.44 markus 1956: if (compat20) {
1.86 markus 1957: reason = packet_get_int();
1.110 markus 1958: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.86 markus 1959: msg = packet_get_string(NULL);
1960: lang = packet_get_string(NULL);
1961: }
1.48 markus 1962: packet_done();
1.114 markus 1963: log("channel %d: open failed: %s%s%s", id,
1964: reason2txt(reason), msg ? ": ": "", msg ? msg : "");
1.86 markus 1965: if (msg != NULL)
1966: xfree(msg);
1967: if (lang != NULL)
1968: xfree(lang);
1.44 markus 1969: }
1.25 markus 1970: /* Free the channel. This will also close the socket. */
1.113 markus 1971: channel_free(c);
1.1 deraadt 1972: }
1973:
1.44 markus 1974: void
1.69 markus 1975: channel_input_channel_request(int type, int plen, void *ctxt)
1.44 markus 1976: {
1977: int id;
1978: Channel *c;
1979:
1980: id = packet_get_int();
1981: c = channel_lookup(id);
1982:
1983: if (c == NULL ||
1984: (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL))
1985: packet_disconnect("Received request for "
1986: "non-open channel %d.", id);
1987: if (c->cb_fn != NULL && c->cb_event == type) {
1.70 markus 1988: debug2("callback start");
1.44 markus 1989: c->cb_fn(c->self, c->cb_arg);
1.70 markus 1990: debug2("callback done");
1.44 markus 1991: } else {
1992: char *service = packet_get_string(NULL);
1.94 markus 1993: debug("channel %d: rcvd request for %s", c->self, service);
1.70 markus 1994: debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event);
1.44 markus 1995: xfree(service);
1996: }
1997: }
1998:
1.121 markus 1999: void
2000: channel_input_window_adjust(int type, int plen, void *ctxt)
2001: {
2002: Channel *c;
2003: int id, adjust;
2004:
2005: if (!compat20)
2006: return;
2007:
2008: /* Get the channel number and verify it. */
2009: id = packet_get_int();
2010: c = channel_lookup(id);
1.1 deraadt 2011:
1.121 markus 2012: if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
2013: log("Received window adjust for "
2014: "non-open channel %d.", id);
2015: return;
2016: }
2017: adjust = packet_get_int();
2018: packet_done();
2019: debug2("channel %d: rcvd adjust %d", id, adjust);
2020: c->remote_window += adjust;
2021: }
1.1 deraadt 2022:
1.121 markus 2023: void
2024: channel_input_port_open(int type, int plen, void *ctxt)
1.1 deraadt 2025: {
1.121 markus 2026: Channel *c = NULL;
2027: u_short host_port;
2028: char *host, *originator_string;
2029: int remote_id, sock = -1;
2030:
2031: remote_id = packet_get_int();
2032: host = packet_get_string(NULL);
2033: host_port = packet_get_int();
1.25 markus 2034:
1.121 markus 2035: if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2036: originator_string = packet_get_string(NULL);
2037: } else {
2038: originator_string = xstrdup("unknown (remote did not supply name)");
2039: }
2040: packet_done();
2041: sock = channel_connect_to(host, host_port);
2042: if (sock != -1) {
2043: c = channel_new("connected socket",
2044: SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
2045: originator_string, 1);
2046: if (c == NULL) {
2047: error("channel_input_port_open: channel_new failed");
2048: close(sock);
2049: } else {
2050: c->remote_id = remote_id;
1.25 markus 2051: }
2052: }
1.121 markus 2053: if (c == NULL) {
2054: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2055: packet_put_int(remote_id);
2056: packet_send();
2057: }
2058: xfree(host);
1.1 deraadt 2059: }
2060:
1.121 markus 2061:
2062: /* -- tcp forwarding */
1.135 markus 2063:
2064: void
2065: channel_set_af(int af)
2066: {
2067: IPv4or6 = af;
2068: }
1.121 markus 2069:
1.27 markus 2070: /*
2071: * Initiate forwarding of connections to local port "port" through the secure
2072: * channel to host:port from remote side.
2073: */
1.87 markus 2074: int
1.73 markus 2075: channel_request_local_forwarding(u_short listen_port, const char *host_to_connect,
2076: u_short port_to_connect, int gateway_ports)
2077: {
1.87 markus 2078: return channel_request_forwarding(
1.73 markus 2079: NULL, listen_port,
2080: host_to_connect, port_to_connect,
2081: gateway_ports, /*remote_fwd*/ 0);
2082: }
1.1 deraadt 2083:
1.73 markus 2084: /*
2085: * If 'remote_fwd' is true we have a '-R style' listener for protocol 2
2086: * (SSH_CHANNEL_RPORT_LISTENER).
2087: */
1.87 markus 2088: int
1.73 markus 2089: channel_request_forwarding(
2090: const char *listen_address, u_short listen_port,
2091: const char *host_to_connect, u_short port_to_connect,
2092: int gateway_ports, int remote_fwd)
1.25 markus 2093: {
1.113 markus 2094: Channel *c;
1.121 markus 2095: int success, sock, on = 1, type;
1.35 markus 2096: struct addrinfo hints, *ai, *aitop;
2097: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
1.73 markus 2098: const char *host;
1.28 markus 2099: struct linger linger;
1.25 markus 2100:
1.87 markus 2101: success = 0;
2102:
1.73 markus 2103: if (remote_fwd) {
2104: host = listen_address;
1.121 markus 2105: type = SSH_CHANNEL_RPORT_LISTENER;
1.73 markus 2106: } else {
2107: host = host_to_connect;
1.121 markus 2108: type = SSH_CHANNEL_PORT_LISTENER;
1.73 markus 2109: }
2110:
1.113 markus 2111: if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
1.87 markus 2112: error("Forward host name too long.");
2113: return success;
2114: }
1.25 markus 2115:
1.73 markus 2116: /* XXX listen_address is currently ignored */
1.28 markus 2117: /*
1.35 markus 2118: * getaddrinfo returns a loopback address if the hostname is
2119: * set to NULL and hints.ai_flags is not AI_PASSIVE
1.28 markus 2120: */
1.35 markus 2121: memset(&hints, 0, sizeof(hints));
2122: hints.ai_family = IPv4or6;
2123: hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
2124: hints.ai_socktype = SOCK_STREAM;
1.73 markus 2125: snprintf(strport, sizeof strport, "%d", listen_port);
1.35 markus 2126: if (getaddrinfo(NULL, strport, &hints, &aitop) != 0)
2127: packet_disconnect("getaddrinfo: fatal error");
2128:
2129: for (ai = aitop; ai; ai = ai->ai_next) {
2130: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2131: continue;
2132: if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2133: strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1.73 markus 2134: error("channel_request_forwarding: getnameinfo failed");
1.35 markus 2135: continue;
2136: }
2137: /* Create a port to listen for the host. */
2138: sock = socket(ai->ai_family, SOCK_STREAM, 0);
2139: if (sock < 0) {
2140: /* this is no error since kernel may not support ipv6 */
2141: verbose("socket: %.100s", strerror(errno));
2142: continue;
2143: }
2144: /*
2145: * Set socket options. We would like the socket to disappear
2146: * as soon as it has been closed for whatever reason.
2147: */
2148: setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
2149: linger.l_onoff = 1;
2150: linger.l_linger = 5;
2151: setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger));
2152: debug("Local forwarding listening on %s port %s.", ntop, strport);
2153:
2154: /* Bind the socket to the address. */
2155: if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2156: /* address can be in use ipv6 address is already bound */
2157: verbose("bind: %.100s", strerror(errno));
2158: close(sock);
2159: continue;
2160: }
2161: /* Start listening for connections on the socket. */
2162: if (listen(sock, 5) < 0) {
2163: error("listen: %.100s", strerror(errno));
2164: close(sock);
2165: continue;
2166: }
2167: /* Allocate a channel number for the socket. */
1.121 markus 2168: c = channel_new("port listener", type, sock, sock, -1,
1.51 markus 2169: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1.71 markus 2170: 0, xstrdup("port listener"), 1);
1.113 markus 2171: if (c == NULL) {
2172: error("channel_request_forwarding: channel_new failed");
2173: close(sock);
2174: continue;
2175: }
2176: strlcpy(c->path, host, sizeof(c->path));
2177: c->host_port = port_to_connect;
2178: c->listening_port = listen_port;
1.35 markus 2179: success = 1;
2180: }
2181: if (success == 0)
1.87 markus 2182: error("channel_request_forwarding: cannot listen to port: %d",
2183: listen_port);
1.35 markus 2184: freeaddrinfo(aitop);
1.87 markus 2185: return success;
1.25 markus 2186: }
1.1 deraadt 2187:
1.27 markus 2188: /*
2189: * Initiate forwarding of connections to port "port" on remote host through
2190: * the secure channel to host:port from local side.
2191: */
1.1 deraadt 2192:
1.49 markus 2193: void
1.73 markus 2194: channel_request_remote_forwarding(u_short listen_port,
2195: const char *host_to_connect, u_short port_to_connect)
1.25 markus 2196: {
1.73 markus 2197: int payload_len, type, success = 0;
2198:
1.25 markus 2199: /* Record locally that connection to this host/port is permitted. */
2200: if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2201: fatal("channel_request_remote_forwarding: too many forwards");
2202:
2203: /* Send the forward request to the remote side. */
1.44 markus 2204: if (compat20) {
2205: const char *address_to_bind = "0.0.0.0";
2206: packet_start(SSH2_MSG_GLOBAL_REQUEST);
2207: packet_put_cstring("tcpip-forward");
2208: packet_put_char(0); /* boolean: want reply */
2209: packet_put_cstring(address_to_bind);
2210: packet_put_int(listen_port);
1.73 markus 2211: packet_send();
2212: packet_write_wait();
2213: /* Assume that server accepts the request */
2214: success = 1;
1.44 markus 2215: } else {
2216: packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
1.50 markus 2217: packet_put_int(listen_port);
2218: packet_put_cstring(host_to_connect);
1.44 markus 2219: packet_put_int(port_to_connect);
2220: packet_send();
2221: packet_write_wait();
1.73 markus 2222:
2223: /* Wait for response from the remote side. */
2224: type = packet_read(&payload_len);
2225: switch (type) {
2226: case SSH_SMSG_SUCCESS:
2227: success = 1;
2228: break;
2229: case SSH_SMSG_FAILURE:
2230: log("Warning: Server denied remote port forwarding.");
2231: break;
2232: default:
2233: /* Unknown packet */
2234: packet_disconnect("Protocol error for port forward request:"
2235: "received packet type %d.", type);
2236: }
2237: }
2238: if (success) {
2239: permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2240: permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2241: permitted_opens[num_permitted_opens].listen_port = listen_port;
2242: num_permitted_opens++;
1.44 markus 2243: }
1.1 deraadt 2244: }
2245:
1.27 markus 2246: /*
2247: * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2248: * listening for the port, and sends back a success reply (or disconnect
2249: * message if there was an error). This never returns if there was an error.
2250: */
1.1 deraadt 2251:
1.49 markus 2252: void
1.56 markus 2253: channel_input_port_forward_request(int is_root, int gateway_ports)
1.1 deraadt 2254: {
1.31 markus 2255: u_short port, host_port;
1.25 markus 2256: char *hostname;
1.1 deraadt 2257:
1.25 markus 2258: /* Get arguments from the packet. */
2259: port = packet_get_int();
2260: hostname = packet_get_string(NULL);
2261: host_port = packet_get_int();
2262:
1.27 markus 2263: /*
2264: * Check that an unprivileged user is not trying to forward a
2265: * privileged port.
2266: */
1.25 markus 2267: if (port < IPPORT_RESERVED && !is_root)
2268: packet_disconnect("Requested forwarding of port %d but user is not root.",
2269: port);
1.73 markus 2270: /* Initiate forwarding */
1.56 markus 2271: channel_request_local_forwarding(port, hostname, host_port, gateway_ports);
1.25 markus 2272:
2273: /* Free the argument string. */
2274: xfree(hostname);
1.1 deraadt 2275: }
2276:
1.99 markus 2277: /*
2278: * Permits opening to any host/port if permitted_opens[] is empty. This is
2279: * usually called by the server, because the user could connect to any port
2280: * anyway, and the server has no way to know but to trust the client anyway.
2281: */
2282: void
2283: channel_permit_all_opens()
2284: {
2285: if (num_permitted_opens == 0)
2286: all_opens_permitted = 1;
2287: }
2288:
1.101 markus 2289: void
1.99 markus 2290: channel_add_permitted_opens(char *host, int port)
2291: {
2292: if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2293: fatal("channel_request_remote_forwarding: too many forwards");
2294: debug("allow port forwarding to host %s port %d", host, port);
2295:
2296: permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2297: permitted_opens[num_permitted_opens].port_to_connect = port;
2298: num_permitted_opens++;
2299:
2300: all_opens_permitted = 0;
2301: }
2302:
1.101 markus 2303: void
1.99 markus 2304: channel_clear_permitted_opens(void)
2305: {
2306: int i;
2307:
2308: for (i = 0; i < num_permitted_opens; i++)
2309: xfree(permitted_opens[i].host_to_connect);
2310: num_permitted_opens = 0;
2311:
2312: }
2313:
2314:
2315: /* return socket to remote host, port */
1.127 itojun 2316: static int
1.99 markus 2317: connect_to(const char *host, u_short port)
1.41 markus 2318: {
2319: struct addrinfo hints, *ai, *aitop;
2320: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2321: int gaierr;
2322: int sock = -1;
2323:
2324: memset(&hints, 0, sizeof(hints));
2325: hints.ai_family = IPv4or6;
2326: hints.ai_socktype = SOCK_STREAM;
1.99 markus 2327: snprintf(strport, sizeof strport, "%d", port);
1.41 markus 2328: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
1.99 markus 2329: error("connect_to %.100s: unknown host (%s)", host,
2330: gai_strerror(gaierr));
1.41 markus 2331: return -1;
2332: }
2333: for (ai = aitop; ai; ai = ai->ai_next) {
2334: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2335: continue;
2336: if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2337: strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1.99 markus 2338: error("connect_to: getnameinfo failed");
1.41 markus 2339: continue;
2340: }
2341: sock = socket(ai->ai_family, SOCK_STREAM, 0);
2342: if (sock < 0) {
2343: error("socket: %.100s", strerror(errno));
2344: continue;
2345: }
1.80 markus 2346: if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0)
1.75 markus 2347: fatal("connect_to: F_SETFL: %s", strerror(errno));
2348: if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
2349: errno != EINPROGRESS) {
1.99 markus 2350: error("connect_to %.100s port %s: %.100s", ntop, strport,
1.41 markus 2351: strerror(errno));
2352: close(sock);
1.89 stevesk 2353: continue; /* fail -- try next */
1.41 markus 2354: }
2355: break; /* success */
2356:
2357: }
2358: freeaddrinfo(aitop);
2359: if (!ai) {
1.99 markus 2360: error("connect_to %.100s port %d: failed.", host, port);
1.41 markus 2361: return -1;
2362: }
2363: /* success */
2364: return sock;
2365: }
1.99 markus 2366:
1.73 markus 2367: int
1.130 stevesk 2368: channel_connect_by_listen_address(u_short listen_port)
1.73 markus 2369: {
2370: int i;
1.99 markus 2371:
1.73 markus 2372: for (i = 0; i < num_permitted_opens; i++)
2373: if (permitted_opens[i].listen_port == listen_port)
1.99 markus 2374: return connect_to(
1.73 markus 2375: permitted_opens[i].host_to_connect,
2376: permitted_opens[i].port_to_connect);
1.74 markus 2377: error("WARNING: Server requests forwarding for unknown listen_port %d",
2378: listen_port);
1.73 markus 2379: return -1;
2380: }
2381:
1.99 markus 2382: /* Check if connecting to that port is permitted and connect. */
2383: int
2384: channel_connect_to(const char *host, u_short port)
2385: {
2386: int i, permit;
2387:
2388: permit = all_opens_permitted;
2389: if (!permit) {
2390: for (i = 0; i < num_permitted_opens; i++)
2391: if (permitted_opens[i].port_to_connect == port &&
2392: strcmp(permitted_opens[i].host_to_connect, host) == 0)
2393: permit = 1;
2394:
2395: }
2396: if (!permit) {
2397: log("Received request to connect to host %.100s port %d, "
2398: "but the request was denied.", host, port);
2399: return -1;
2400: }
2401: return connect_to(host, port);
2402: }
2403:
1.121 markus 2404: /* -- X11 forwarding */
1.1 deraadt 2405:
1.27 markus 2406: /*
2407: * Creates an internet domain socket for listening for X11 connections.
2408: * Returns a suitable value for the DISPLAY variable, or NULL if an error
2409: * occurs.
2410: */
1.25 markus 2411: char *
1.33 markus 2412: x11_create_display_inet(int screen_number, int x11_display_offset)
1.1 deraadt 2413: {
1.31 markus 2414: int display_number, sock;
2415: u_short port;
1.35 markus 2416: struct addrinfo hints, *ai, *aitop;
2417: char strport[NI_MAXSERV];
2418: int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
2419: char display[512];
1.25 markus 2420: char hostname[MAXHOSTNAMELEN];
2421:
1.33 markus 2422: for (display_number = x11_display_offset;
1.25 markus 2423: display_number < MAX_DISPLAYS;
2424: display_number++) {
2425: port = 6000 + display_number;
1.35 markus 2426: memset(&hints, 0, sizeof(hints));
2427: hints.ai_family = IPv4or6;
1.36 markus 2428: hints.ai_flags = AI_PASSIVE; /* XXX loopback only ? */
1.35 markus 2429: hints.ai_socktype = SOCK_STREAM;
2430: snprintf(strport, sizeof strport, "%d", port);
2431: if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
2432: error("getaddrinfo: %.100s", gai_strerror(gaierr));
1.25 markus 2433: return NULL;
2434: }
1.35 markus 2435: for (ai = aitop; ai; ai = ai->ai_next) {
2436: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2437: continue;
2438: sock = socket(ai->ai_family, SOCK_STREAM, 0);
2439: if (sock < 0) {
2440: error("socket: %.100s", strerror(errno));
2441: return NULL;
2442: }
2443: if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2444: debug("bind port %d: %.100s", port, strerror(errno));
2445: shutdown(sock, SHUT_RDWR);
2446: close(sock);
2447: for (n = 0; n < num_socks; n++) {
2448: shutdown(socks[n], SHUT_RDWR);
2449: close(socks[n]);
2450: }
2451: num_socks = 0;
2452: break;
2453: }
2454: socks[num_socks++] = sock;
2455: if (num_socks == NUM_SOCKS)
2456: break;
1.25 markus 2457: }
1.83 stevesk 2458: freeaddrinfo(aitop);
1.35 markus 2459: if (num_socks > 0)
2460: break;
1.25 markus 2461: }
2462: if (display_number >= MAX_DISPLAYS) {
2463: error("Failed to allocate internet-domain X11 display socket.");
2464: return NULL;
2465: }
2466: /* Start listening for connections on the socket. */
1.35 markus 2467: for (n = 0; n < num_socks; n++) {
2468: sock = socks[n];
2469: if (listen(sock, 5) < 0) {
2470: error("listen: %.100s", strerror(errno));
2471: shutdown(sock, SHUT_RDWR);
2472: close(sock);
2473: return NULL;
2474: }
1.25 markus 2475: }
1.35 markus 2476:
1.25 markus 2477: /* Set up a suitable value for the DISPLAY variable. */
2478: if (gethostname(hostname, sizeof(hostname)) < 0)
2479: fatal("gethostname: %.100s", strerror(errno));
1.35 markus 2480: snprintf(display, sizeof display, "%.400s:%d.%d", hostname,
1.25 markus 2481: display_number, screen_number);
2482:
1.35 markus 2483: /* Allocate a channel for each socket. */
2484: for (n = 0; n < num_socks; n++) {
2485: sock = socks[n];
1.51 markus 2486: (void) channel_new("x11 listener",
2487: SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
2488: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.71 markus 2489: 0, xstrdup("X11 inet listener"), 1);
1.35 markus 2490: }
1.1 deraadt 2491:
1.25 markus 2492: /* Return a suitable value for the DISPLAY environment variable. */
1.35 markus 2493: return xstrdup(display);
1.1 deraadt 2494: }
2495:
2496: #ifndef X_UNIX_PATH
2497: #define X_UNIX_PATH "/tmp/.X11-unix/X"
2498: #endif
2499:
1.127 itojun 2500: static int
1.77 markus 2501: connect_local_xsocket(u_int dnr)
1.1 deraadt 2502: {
1.25 markus 2503: static const char *const x_sockets[] = {
2504: X_UNIX_PATH "%u",
2505: "/var/X/.X11-unix/X" "%u",
2506: "/usr/spool/sockets/X11/" "%u",
2507: NULL
2508: };
2509: int sock;
2510: struct sockaddr_un addr;
2511: const char *const * path;
2512:
2513: for (path = x_sockets; *path; ++path) {
2514: sock = socket(AF_UNIX, SOCK_STREAM, 0);
2515: if (sock < 0)
2516: error("socket: %.100s", strerror(errno));
2517: memset(&addr, 0, sizeof(addr));
2518: addr.sun_family = AF_UNIX;
2519: snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr);
2520: if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
2521: return sock;
2522: close(sock);
2523: }
2524: error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
2525: return -1;
1.1 deraadt 2526: }
2527:
1.51 markus 2528: int
2529: x11_connect_display(void)
1.1 deraadt 2530: {
1.51 markus 2531: int display_number, sock = 0;
1.25 markus 2532: const char *display;
1.51 markus 2533: char buf[1024], *cp;
1.35 markus 2534: struct addrinfo hints, *ai, *aitop;
2535: char strport[NI_MAXSERV];
2536: int gaierr;
1.25 markus 2537:
2538: /* Try to open a socket for the local X server. */
2539: display = getenv("DISPLAY");
2540: if (!display) {
2541: error("DISPLAY not set.");
1.51 markus 2542: return -1;
1.25 markus 2543: }
1.27 markus 2544: /*
2545: * Now we decode the value of the DISPLAY variable and make a
2546: * connection to the real X server.
2547: */
2548:
2549: /*
2550: * Check if it is a unix domain socket. Unix domain displays are in
2551: * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
2552: */
1.25 markus 2553: if (strncmp(display, "unix:", 5) == 0 ||
2554: display[0] == ':') {
2555: /* Connect to the unix domain socket. */
2556: if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
2557: error("Could not parse display number from DISPLAY: %.100s",
2558: display);
1.51 markus 2559: return -1;
1.25 markus 2560: }
2561: /* Create a socket. */
2562: sock = connect_local_xsocket(display_number);
2563: if (sock < 0)
1.51 markus 2564: return -1;
1.25 markus 2565:
2566: /* OK, we now have a connection to the display. */
1.51 markus 2567: return sock;
1.25 markus 2568: }
1.27 markus 2569: /*
2570: * Connect to an inet socket. The DISPLAY value is supposedly
2571: * hostname:d[.s], where hostname may also be numeric IP address.
2572: */
1.25 markus 2573: strncpy(buf, display, sizeof(buf));
2574: buf[sizeof(buf) - 1] = 0;
2575: cp = strchr(buf, ':');
2576: if (!cp) {
2577: error("Could not find ':' in DISPLAY: %.100s", display);
1.51 markus 2578: return -1;
1.25 markus 2579: }
2580: *cp = 0;
1.27 markus 2581: /* buf now contains the host name. But first we parse the display number. */
1.25 markus 2582: if (sscanf(cp + 1, "%d", &display_number) != 1) {
2583: error("Could not parse display number from DISPLAY: %.100s",
2584: display);
1.51 markus 2585: return -1;
1.25 markus 2586: }
1.35 markus 2587:
2588: /* Look up the host address */
2589: memset(&hints, 0, sizeof(hints));
2590: hints.ai_family = IPv4or6;
2591: hints.ai_socktype = SOCK_STREAM;
2592: snprintf(strport, sizeof strport, "%d", 6000 + display_number);
2593: if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
2594: error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
1.51 markus 2595: return -1;
1.25 markus 2596: }
1.35 markus 2597: for (ai = aitop; ai; ai = ai->ai_next) {
2598: /* Create a socket. */
2599: sock = socket(ai->ai_family, SOCK_STREAM, 0);
2600: if (sock < 0) {
2601: debug("socket: %.100s", strerror(errno));
1.41 markus 2602: continue;
2603: }
2604: /* Connect it to the display. */
2605: if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2606: debug("connect %.100s port %d: %.100s", buf,
2607: 6000 + display_number, strerror(errno));
2608: close(sock);
2609: continue;
2610: }
2611: /* Success */
2612: break;
1.35 markus 2613: }
2614: freeaddrinfo(aitop);
2615: if (!ai) {
1.49 markus 2616: error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
1.35 markus 2617: strerror(errno));
1.51 markus 2618: return -1;
1.25 markus 2619: }
1.51 markus 2620: return sock;
2621: }
2622:
2623: /*
2624: * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
2625: * the remote channel number. We should do whatever we want, and respond
2626: * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2627: */
2628:
2629: void
1.69 markus 2630: x11_input_open(int type, int plen, void *ctxt)
1.51 markus 2631: {
1.113 markus 2632: Channel *c = NULL;
2633: int remote_id, sock = 0;
1.51 markus 2634: char *remote_host;
1.25 markus 2635:
1.113 markus 2636: debug("Received X11 open request.");
1.51 markus 2637:
1.113 markus 2638: remote_id = packet_get_int();
1.121 markus 2639:
2640: if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
1.113 markus 2641: remote_host = packet_get_string(NULL);
1.51 markus 2642: } else {
2643: remote_host = xstrdup("unknown (remote did not supply name)");
2644: }
1.113 markus 2645: packet_done();
1.25 markus 2646:
1.51 markus 2647: /* Obtain a connection to the real X display. */
2648: sock = x11_connect_display();
1.113 markus 2649: if (sock != -1) {
2650: /* Allocate a channel for this connection. */
2651: c = channel_new("connected x11 socket",
2652: SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
2653: remote_host, 1);
2654: if (c == NULL) {
2655: error("x11_input_open: channel_new failed");
2656: close(sock);
2657: } else {
2658: c->remote_id = remote_id;
1.133 markus 2659: c->force_drain = 1;
1.113 markus 2660: }
2661: }
2662: if (c == NULL) {
1.51 markus 2663: /* Send refusal to the remote host. */
2664: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1.113 markus 2665: packet_put_int(remote_id);
1.51 markus 2666: } else {
2667: /* Send a confirmation to the remote host. */
2668: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1.113 markus 2669: packet_put_int(remote_id);
2670: packet_put_int(c->self);
1.51 markus 2671: }
1.113 markus 2672: packet_send();
1.72 markus 2673: }
2674:
2675: /* dummy protocol handler that denies SSH-1 requests (agent/x11) */
2676: void
2677: deny_input_open(int type, int plen, void *ctxt)
2678: {
2679: int rchan = packet_get_int();
2680: switch(type){
2681: case SSH_SMSG_AGENT_OPEN:
2682: error("Warning: ssh server tried agent forwarding.");
2683: break;
2684: case SSH_SMSG_X11_OPEN:
2685: error("Warning: ssh server tried X11 forwarding.");
2686: break;
2687: default:
2688: error("deny_input_open: type %d plen %d", type, plen);
2689: break;
2690: }
2691: error("Warning: this is probably a break in attempt by a malicious server.");
2692: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2693: packet_put_int(rchan);
2694: packet_send();
1.1 deraadt 2695: }
2696:
1.27 markus 2697: /*
2698: * Requests forwarding of X11 connections, generates fake authentication
2699: * data, and enables authentication spoofing.
1.121 markus 2700: * This should be called in the client only.
1.27 markus 2701: */
1.49 markus 2702: void
1.51 markus 2703: x11_request_forwarding_with_spoofing(int client_session_id,
2704: const char *proto, const char *data)
1.1 deraadt 2705: {
1.77 markus 2706: u_int data_len = (u_int) strlen(data) / 2;
1.90 markus 2707: u_int i, value, len;
1.25 markus 2708: char *new_data;
2709: int screen_number;
2710: const char *cp;
2711: u_int32_t rand = 0;
2712:
2713: cp = getenv("DISPLAY");
2714: if (cp)
2715: cp = strchr(cp, ':');
2716: if (cp)
2717: cp = strchr(cp, '.');
2718: if (cp)
2719: screen_number = atoi(cp + 1);
2720: else
2721: screen_number = 0;
2722:
2723: /* Save protocol name. */
2724: x11_saved_proto = xstrdup(proto);
2725:
1.27 markus 2726: /*
2727: * Extract real authentication data and generate fake data of the
2728: * same length.
2729: */
1.25 markus 2730: x11_saved_data = xmalloc(data_len);
2731: x11_fake_data = xmalloc(data_len);
2732: for (i = 0; i < data_len; i++) {
2733: if (sscanf(data + 2 * i, "%2x", &value) != 1)
2734: fatal("x11_request_forwarding: bad authentication data: %.100s", data);
2735: if (i % 4 == 0)
2736: rand = arc4random();
2737: x11_saved_data[i] = value;
2738: x11_fake_data[i] = rand & 0xff;
2739: rand >>= 8;
2740: }
2741: x11_saved_data_len = data_len;
2742: x11_fake_data_len = data_len;
2743:
2744: /* Convert the fake data into hex. */
1.90 markus 2745: len = 2 * data_len + 1;
2746: new_data = xmalloc(len);
1.25 markus 2747: for (i = 0; i < data_len; i++)
1.90 markus 2748: snprintf(new_data + 2 * i, len - 2 * i,
2749: "%02x", (u_char) x11_fake_data[i]);
1.25 markus 2750:
2751: /* Send the request packet. */
1.51 markus 2752: if (compat20) {
2753: channel_request_start(client_session_id, "x11-req", 0);
2754: packet_put_char(0); /* XXX bool single connection */
2755: } else {
2756: packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
2757: }
2758: packet_put_cstring(proto);
2759: packet_put_cstring(new_data);
1.25 markus 2760: packet_put_int(screen_number);
2761: packet_send();
2762: packet_write_wait();
2763: xfree(new_data);
1.1 deraadt 2764: }
2765:
1.121 markus 2766:
2767: /* -- agent forwarding */
2768:
1.1 deraadt 2769: /* Sends a message to the server to request authentication fd forwarding. */
2770:
1.49 markus 2771: void
1.25 markus 2772: auth_request_forwarding()
1.1 deraadt 2773: {
1.25 markus 2774: packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
2775: packet_send();
2776: packet_write_wait();
1.1 deraadt 2777: }
2778:
1.27 markus 2779: /*
2780: * Returns the name of the forwarded authentication socket. Returns NULL if
2781: * there is no forwarded authentication socket. The returned value points to
2782: * a static buffer.
2783: */
1.1 deraadt 2784:
1.25 markus 2785: char *
2786: auth_get_socket_name()
1.1 deraadt 2787: {
1.121 markus 2788: return auth_sock_name;
1.1 deraadt 2789: }
2790:
1.12 markus 2791: /* removes the agent forwarding socket */
2792:
1.49 markus 2793: void
1.123 markus 2794: auth_sock_cleanup_proc(void *_pw)
1.25 markus 2795: {
1.123 markus 2796: struct passwd *pw = _pw;
2797:
1.122 markus 2798: if (auth_sock_name) {
1.123 markus 2799: temporarily_use_uid(pw);
1.122 markus 2800: unlink(auth_sock_name);
2801: rmdir(auth_sock_dir);
2802: auth_sock_name = NULL;
1.123 markus 2803: restore_uid();
1.122 markus 2804: }
1.12 markus 2805: }
2806:
1.27 markus 2807: /*
1.59 markus 2808: * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
1.27 markus 2809: * This starts forwarding authentication requests.
2810: */
1.1 deraadt 2811:
1.59 markus 2812: int
1.25 markus 2813: auth_input_request_forwarding(struct passwd * pw)
1.1 deraadt 2814: {
1.113 markus 2815: Channel *nc;
2816: int sock;
1.25 markus 2817: struct sockaddr_un sunaddr;
2818:
1.121 markus 2819: if (auth_get_socket_name() != NULL) {
2820: error("authentication forwarding requested twice.");
2821: return 0;
2822: }
1.25 markus 2823:
2824: /* Temporarily drop privileged uid for mkdir/bind. */
1.102 markus 2825: temporarily_use_uid(pw);
1.25 markus 2826:
2827: /* Allocate a buffer for the socket name, and format the name. */
1.121 markus 2828: auth_sock_name = xmalloc(MAXPATHLEN);
2829: auth_sock_dir = xmalloc(MAXPATHLEN);
2830: strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
1.25 markus 2831:
2832: /* Create private directory for socket */
1.121 markus 2833: if (mkdtemp(auth_sock_dir) == NULL) {
2834: packet_send_debug("Agent forwarding disabled: "
2835: "mkdtemp() failed: %.100s", strerror(errno));
1.59 markus 2836: restore_uid();
1.121 markus 2837: xfree(auth_sock_name);
2838: xfree(auth_sock_dir);
2839: auth_sock_name = NULL;
2840: auth_sock_dir = NULL;
1.59 markus 2841: return 0;
2842: }
1.121 markus 2843: snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%d",
2844: auth_sock_dir, (int) getpid());
1.25 markus 2845:
1.122 markus 2846: /* delete agent socket on fatal() */
1.123 markus 2847: fatal_add_cleanup(auth_sock_cleanup_proc, pw);
1.122 markus 2848:
1.25 markus 2849: /* Create the socket. */
2850: sock = socket(AF_UNIX, SOCK_STREAM, 0);
2851: if (sock < 0)
2852: packet_disconnect("socket: %.100s", strerror(errno));
2853:
2854: /* Bind it to the name. */
2855: memset(&sunaddr, 0, sizeof(sunaddr));
2856: sunaddr.sun_family = AF_UNIX;
1.121 markus 2857: strncpy(sunaddr.sun_path, auth_sock_name,
1.25 markus 2858: sizeof(sunaddr.sun_path));
2859:
2860: if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
2861: packet_disconnect("bind: %.100s", strerror(errno));
2862:
2863: /* Restore the privileged uid. */
2864: restore_uid();
2865:
2866: /* Start listening on the socket. */
2867: if (listen(sock, 5) < 0)
2868: packet_disconnect("listen: %.100s", strerror(errno));
2869:
2870: /* Allocate a channel for the authentication agent socket. */
1.113 markus 2871: nc = channel_new("auth socket",
1.73 markus 2872: SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
2873: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
2874: 0, xstrdup("auth socket"), 1);
1.113 markus 2875: if (nc == NULL) {
2876: error("auth_input_request_forwarding: channel_new failed");
1.123 markus 2877: auth_sock_cleanup_proc(pw);
1.124 markus 2878: fatal_remove_cleanup(auth_sock_cleanup_proc, pw);
1.113 markus 2879: close(sock);
2880: return 0;
2881: }
1.121 markus 2882: strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
1.59 markus 2883: return 1;
1.1 deraadt 2884: }
2885:
2886: /* This is called to process an SSH_SMSG_AGENT_OPEN message. */
2887:
1.49 markus 2888: void
1.69 markus 2889: auth_input_open_request(int type, int plen, void *ctxt)
1.1 deraadt 2890: {
1.113 markus 2891: Channel *c = NULL;
2892: int remote_id, sock;
1.121 markus 2893: char *name;
1.41 markus 2894:
2895: packet_integrity_check(plen, 4, type);
1.25 markus 2896:
2897: /* Read the remote channel number from the message. */
1.113 markus 2898: remote_id = packet_get_int();
1.25 markus 2899:
1.27 markus 2900: /*
2901: * Get a connection to the local authentication agent (this may again
2902: * get forwarded).
2903: */
1.25 markus 2904: sock = ssh_get_authentication_socket();
2905:
1.27 markus 2906: /*
2907: * If we could not connect the agent, send an error message back to
2908: * the server. This should never happen unless the agent dies,
2909: * because authentication forwarding is only enabled if we have an
2910: * agent.
2911: */
1.113 markus 2912: if (sock >= 0) {
1.121 markus 2913: name = xstrdup("authentication agent connection");
2914: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
2915: -1, 0, 0, 0, name, 1);
1.113 markus 2916: if (c == NULL) {
2917: error("auth_input_open_request: channel_new failed");
1.121 markus 2918: xfree(name);
1.113 markus 2919: close(sock);
2920: } else {
2921: c->remote_id = remote_id;
1.133 markus 2922: c->force_drain = 1;
1.113 markus 2923: }
2924: }
2925: if (c == NULL) {
1.25 markus 2926: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1.113 markus 2927: packet_put_int(remote_id);
2928: } else {
2929: /* Send a confirmation to the remote host. */
2930: debug("Forwarding authentication connection.");
2931: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
2932: packet_put_int(remote_id);
2933: packet_put_int(c->self);
1.25 markus 2934: }
2935: packet_send();
1.1 deraadt 2936: }
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