Annotation of src/usr.bin/ssh/channels.c, Revision 1.106
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: *
15: *
1.44 markus 16: * SSH2 support added by Markus Friedl.
1.67 deraadt 17: * Copyright (c) 1999,2000 Markus Friedl. All rights reserved.
18: * Copyright (c) 1999 Dug Song. All rights reserved.
19: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
20: *
21: * Redistribution and use in source and binary forms, with or without
22: * modification, are permitted provided that the following conditions
23: * are met:
24: * 1. Redistributions of source code must retain the above copyright
25: * notice, this list of conditions and the following disclaimer.
26: * 2. Redistributions in binary form must reproduce the above copyright
27: * notice, this list of conditions and the following disclaimer in the
28: * documentation and/or other materials provided with the distribution.
29: *
30: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.26 deraadt 40: */
1.1 deraadt 41:
42: #include "includes.h"
1.106 ! markus 43: RCSID("$OpenBSD: channels.c,v 1.105 2001/04/10 12:15:23 markus Exp $");
1.82 markus 44:
45: #include <openssl/rsa.h>
46: #include <openssl/dsa.h>
1.1 deraadt 47:
48: #include "ssh.h"
1.82 markus 49: #include "ssh1.h"
50: #include "ssh2.h"
1.1 deraadt 51: #include "packet.h"
52: #include "xmalloc.h"
53: #include "buffer.h"
1.103 markus 54: #include "bufaux.h"
1.1 deraadt 55: #include "uidswap.h"
1.82 markus 56: #include "log.h"
57: #include "misc.h"
1.14 markus 58: #include "channels.h"
59: #include "nchan.h"
60: #include "compat.h"
1.82 markus 61: #include "canohost.h"
1.64 markus 62: #include "key.h"
63: #include "authfd.h"
1.44 markus 64:
1.1 deraadt 65: /* Maximum number of fake X11 displays to try. */
66: #define MAX_DISPLAYS 1000
67:
1.12 markus 68: /* Max len of agent socket */
69: #define MAX_SOCKET_NAME 100
70:
1.27 markus 71: /*
72: * Pointer to an array containing all allocated channels. The array is
73: * dynamically extended as needed.
74: */
1.1 deraadt 75: static Channel *channels = NULL;
76:
1.27 markus 77: /*
78: * Size of the channel array. All slots of the array must always be
79: * initialized (at least the type field); unused slots are marked with type
80: * SSH_CHANNEL_FREE.
81: */
1.1 deraadt 82: static int channels_alloc = 0;
83:
1.27 markus 84: /*
85: * Maximum file descriptor value used in any of the channels. This is
86: * updated in channel_allocate.
87: */
1.84 markus 88: static int channel_max_fd = 0;
1.1 deraadt 89:
1.12 markus 90: /* Name and directory of socket for authentication agent forwarding. */
1.1 deraadt 91: static char *channel_forwarded_auth_socket_name = NULL;
1.25 markus 92: static char *channel_forwarded_auth_socket_dir = NULL;
1.1 deraadt 93:
94: /* Saved X11 authentication protocol name. */
95: char *x11_saved_proto = NULL;
96:
97: /* Saved X11 authentication data. This is the real data. */
98: char *x11_saved_data = NULL;
1.77 markus 99: u_int x11_saved_data_len = 0;
1.1 deraadt 100:
1.27 markus 101: /*
102: * Fake X11 authentication data. This is what the server will be sending us;
103: * we should replace any occurrences of this by the real data.
104: */
1.1 deraadt 105: char *x11_fake_data = NULL;
1.77 markus 106: u_int x11_fake_data_len;
1.1 deraadt 107:
1.27 markus 108: /*
109: * Data structure for storing which hosts are permitted for forward requests.
110: * The local sides of any remote forwards are stored in this array to prevent
111: * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
112: * network (which might be behind a firewall).
113: */
1.25 markus 114: typedef struct {
1.41 markus 115: char *host_to_connect; /* Connect to 'host'. */
116: u_short port_to_connect; /* Connect to 'port'. */
117: u_short listen_port; /* Remote side should listen port number. */
1.1 deraadt 118: } ForwardPermission;
119:
120: /* List of all permitted host/port pairs to connect. */
121: static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
122: /* Number of permitted host/port pairs in the array. */
123: static int num_permitted_opens = 0;
1.27 markus 124: /*
125: * If this is true, all opens are permitted. This is the case on the server
126: * on which we have to trust the client anyway, and the user could do
127: * anything after logging in anyway.
128: */
1.1 deraadt 129: static int all_opens_permitted = 0;
130:
131: /* This is set to true if both sides support SSH_PROTOFLAG_HOST_IN_FWD_OPEN. */
132: static int have_hostname_in_open = 0;
1.82 markus 133:
134: /* AF_UNSPEC or AF_INET or AF_INET6 */
135: extern int IPv4or6;
1.1 deraadt 136:
1.103 markus 137: void port_open_helper(Channel *c, char *rtype);
138:
1.1 deraadt 139: /* Sets specific protocol options. */
140:
1.49 markus 141: void
1.25 markus 142: channel_set_options(int hostname_in_open)
1.1 deraadt 143: {
1.25 markus 144: have_hostname_in_open = hostname_in_open;
1.1 deraadt 145: }
146:
1.41 markus 147: /* lookup channel by id */
148:
149: Channel *
150: channel_lookup(int id)
151: {
152: Channel *c;
1.63 provos 153: if (id < 0 || id > channels_alloc) {
1.41 markus 154: log("channel_lookup: %d: bad id", id);
155: return NULL;
156: }
157: c = &channels[id];
158: if (c->type == SSH_CHANNEL_FREE) {
159: log("channel_lookup: %d: bad id: channel free", id);
160: return NULL;
161: }
162: return c;
1.55 markus 163: }
164:
1.27 markus 165: /*
1.55 markus 166: * Register filedescriptors for a channel, used when allocating a channel or
1.52 markus 167: * when the channel consumer/producer is ready, e.g. shell exec'd
1.27 markus 168: */
1.1 deraadt 169:
1.52 markus 170: void
1.71 markus 171: channel_register_fds(Channel *c, int rfd, int wfd, int efd,
172: int extusage, int nonblock)
1.1 deraadt 173: {
1.25 markus 174: /* Update the maximum file descriptor value. */
1.84 markus 175: channel_max_fd = MAX(channel_max_fd, rfd);
176: channel_max_fd = MAX(channel_max_fd, wfd);
177: channel_max_fd = MAX(channel_max_fd, efd);
178:
1.27 markus 179: /* XXX set close-on-exec -markus */
1.55 markus 180:
1.52 markus 181: c->rfd = rfd;
182: c->wfd = wfd;
183: c->sock = (rfd == wfd) ? rfd : -1;
184: c->efd = efd;
185: c->extended_usage = extusage;
1.71 markus 186:
1.91 markus 187: /* XXX ugly hack: nonblock is only set by the server */
188: if (nonblock && isatty(c->rfd)) {
1.94 markus 189: debug("channel %d: rfd %d isatty", c->self, c->rfd);
1.91 markus 190: c->isatty = 1;
191: if (!isatty(c->wfd)) {
1.94 markus 192: error("channel %d: wfd %d is not a tty?",
1.91 markus 193: c->self, c->wfd);
194: }
195: } else {
196: c->isatty = 0;
197: }
198:
1.71 markus 199: /* enable nonblocking mode */
200: if (nonblock) {
201: if (rfd != -1)
202: set_nonblock(rfd);
203: if (wfd != -1)
204: set_nonblock(wfd);
205: if (efd != -1)
206: set_nonblock(efd);
207: }
1.52 markus 208: }
209:
210: /*
211: * Allocate a new channel object and set its type and socket. This will cause
212: * remote_name to be freed.
213: */
214:
215: int
216: channel_new(char *ctype, int type, int rfd, int wfd, int efd,
1.71 markus 217: int window, int maxpack, int extusage, char *remote_name, int nonblock)
1.52 markus 218: {
219: int i, found;
220: Channel *c;
1.25 markus 221:
222: /* Do initial allocation if this is the first call. */
223: if (channels_alloc == 0) {
1.44 markus 224: chan_init();
1.25 markus 225: channels_alloc = 10;
226: channels = xmalloc(channels_alloc * sizeof(Channel));
227: for (i = 0; i < channels_alloc; i++)
228: channels[i].type = SSH_CHANNEL_FREE;
1.27 markus 229: /*
230: * Kludge: arrange a call to channel_stop_listening if we
231: * terminate with fatal().
232: */
1.25 markus 233: fatal_add_cleanup((void (*) (void *)) channel_stop_listening, NULL);
234: }
235: /* Try to find a free slot where to put the new channel. */
236: for (found = -1, i = 0; i < channels_alloc; i++)
237: if (channels[i].type == SSH_CHANNEL_FREE) {
238: /* Found a free slot. */
239: found = i;
240: break;
241: }
242: if (found == -1) {
1.27 markus 243: /* There are no free slots. Take last+1 slot and expand the array. */
1.25 markus 244: found = channels_alloc;
245: channels_alloc += 10;
1.70 markus 246: debug2("channel: expanding %d", channels_alloc);
1.25 markus 247: channels = xrealloc(channels, channels_alloc * sizeof(Channel));
248: for (i = found; i < channels_alloc; i++)
249: channels[i].type = SSH_CHANNEL_FREE;
250: }
251: /* Initialize and return new channel number. */
252: c = &channels[found];
253: buffer_init(&c->input);
254: buffer_init(&c->output);
1.41 markus 255: buffer_init(&c->extended);
1.25 markus 256: chan_init_iostates(c);
1.71 markus 257: channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
1.25 markus 258: c->self = found;
259: c->type = type;
1.41 markus 260: c->ctype = ctype;
1.51 markus 261: c->local_window = window;
262: c->local_window_max = window;
263: c->local_consumed = 0;
264: c->local_maxpacket = maxpack;
1.25 markus 265: c->remote_id = -1;
266: c->remote_name = remote_name;
1.41 markus 267: c->remote_window = 0;
268: c->remote_maxpacket = 0;
269: c->cb_fn = NULL;
270: c->cb_arg = NULL;
271: c->cb_event = 0;
272: c->dettach_user = NULL;
1.65 markus 273: c->input_filter = NULL;
1.25 markus 274: debug("channel %d: new [%s]", found, remote_name);
275: return found;
1.1 deraadt 276: }
1.52 markus 277: /* old interface XXX */
1.49 markus 278: int
1.41 markus 279: channel_allocate(int type, int sock, char *remote_name)
280: {
1.71 markus 281: return channel_new("", type, sock, sock, -1, 0, 0, 0, remote_name, 1);
1.41 markus 282: }
1.1 deraadt 283:
1.52 markus 284:
285: /* Close all channel fd/socket. */
286:
287: void
288: channel_close_fds(Channel *c)
289: {
290: if (c->sock != -1) {
291: close(c->sock);
292: c->sock = -1;
293: }
294: if (c->rfd != -1) {
295: close(c->rfd);
296: c->rfd = -1;
297: }
298: if (c->wfd != -1) {
299: close(c->wfd);
300: c->wfd = -1;
301: }
302: if (c->efd != -1) {
303: close(c->efd);
304: c->efd = -1;
305: }
306: }
307:
308: /* Free the channel and close its fd/socket. */
1.1 deraadt 309:
1.49 markus 310: void
1.41 markus 311: channel_free(int id)
1.1 deraadt 312: {
1.41 markus 313: Channel *c = channel_lookup(id);
1.79 markus 314: char *s = channel_open_message();
315:
1.41 markus 316: if (c == NULL)
317: packet_disconnect("channel free: bad local channel %d", id);
1.79 markus 318: debug("channel_free: channel %d: status: %s", id, s);
319: xfree(s);
320:
1.44 markus 321: if (c->dettach_user != NULL) {
322: debug("channel_free: channel %d: dettaching channel user", id);
323: c->dettach_user(c->self, NULL);
324: }
1.54 markus 325: if (c->sock != -1)
326: shutdown(c->sock, SHUT_RDWR);
1.52 markus 327: channel_close_fds(c);
1.41 markus 328: buffer_free(&c->input);
329: buffer_free(&c->output);
330: buffer_free(&c->extended);
331: c->type = SSH_CHANNEL_FREE;
332: if (c->remote_name) {
333: xfree(c->remote_name);
334: c->remote_name = NULL;
1.25 markus 335: }
1.1 deraadt 336: }
337:
1.27 markus 338: /*
1.41 markus 339: * 'channel_pre*' are called just before select() to add any bits relevant to
340: * channels in the select bitmasks.
341: */
342: /*
343: * 'channel_post*': perform any appropriate operations for channels which
344: * have events pending.
1.27 markus 345: */
1.41 markus 346: typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset);
347: chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
348: chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
349:
350: void
351: channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
352: {
353: FD_SET(c->sock, readset);
354: }
355:
356: void
1.75 markus 357: channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset)
358: {
359: debug3("channel %d: waiting for connection", c->self);
360: FD_SET(c->sock, writeset);
361: }
362:
363: void
1.41 markus 364: channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
365: {
366: if (buffer_len(&c->input) < packet_get_maxsize())
367: FD_SET(c->sock, readset);
368: if (buffer_len(&c->output) > 0)
369: FD_SET(c->sock, writeset);
370: }
1.1 deraadt 371:
1.41 markus 372: void
373: channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset)
374: {
375: /* test whether sockets are 'alive' for read/write */
376: if (c->istate == CHAN_INPUT_OPEN)
377: if (buffer_len(&c->input) < packet_get_maxsize())
378: FD_SET(c->sock, readset);
379: if (c->ostate == CHAN_OUTPUT_OPEN ||
380: c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
381: if (buffer_len(&c->output) > 0) {
382: FD_SET(c->sock, writeset);
383: } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
384: chan_obuf_empty(c);
385: }
386: }
387: }
388:
389: void
1.44 markus 390: channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset)
391: {
392: if (c->istate == CHAN_INPUT_OPEN &&
393: c->remote_window > 0 &&
394: buffer_len(&c->input) < c->remote_window)
395: FD_SET(c->rfd, readset);
396: if (c->ostate == CHAN_OUTPUT_OPEN ||
397: c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
398: if (buffer_len(&c->output) > 0) {
399: FD_SET(c->wfd, writeset);
400: } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
401: chan_obuf_empty(c);
402: }
403: }
404: /** XXX check close conditions, too */
405: if (c->efd != -1) {
406: if (c->extended_usage == CHAN_EXTENDED_WRITE &&
407: buffer_len(&c->extended) > 0)
408: FD_SET(c->efd, writeset);
409: else if (c->extended_usage == CHAN_EXTENDED_READ &&
410: buffer_len(&c->extended) < c->remote_window)
411: FD_SET(c->efd, readset);
412: }
413: }
414:
415: void
1.41 markus 416: channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
417: {
418: if (buffer_len(&c->input) == 0) {
419: packet_start(SSH_MSG_CHANNEL_CLOSE);
420: packet_put_int(c->remote_id);
421: packet_send();
422: c->type = SSH_CHANNEL_CLOSED;
1.105 markus 423: debug("channel %d: closing after input drain.", c->self);
1.41 markus 424: }
425: }
426:
427: void
428: channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
429: {
430: if (buffer_len(&c->output) == 0)
431: channel_free(c->self);
1.49 markus 432: else
1.41 markus 433: FD_SET(c->sock, writeset);
434: }
435:
436: /*
437: * This is a special state for X11 authentication spoofing. An opened X11
438: * connection (when authentication spoofing is being done) remains in this
439: * state until the first packet has been completely read. The authentication
440: * data in that packet is then substituted by the real data if it matches the
441: * fake data, and the channel is put into normal mode.
1.51 markus 442: * XXX All this happens at the client side.
1.41 markus 443: */
444: int
445: x11_open_helper(Channel *c)
1.1 deraadt 446: {
1.77 markus 447: u_char *ucp;
448: u_int proto_len, data_len;
1.25 markus 449:
1.41 markus 450: /* Check if the fixed size part of the packet is in buffer. */
451: if (buffer_len(&c->output) < 12)
452: return 0;
453:
454: /* Parse the lengths of variable-length fields. */
1.77 markus 455: ucp = (u_char *) buffer_ptr(&c->output);
1.41 markus 456: if (ucp[0] == 0x42) { /* Byte order MSB first. */
457: proto_len = 256 * ucp[6] + ucp[7];
458: data_len = 256 * ucp[8] + ucp[9];
459: } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
460: proto_len = ucp[6] + 256 * ucp[7];
461: data_len = ucp[8] + 256 * ucp[9];
462: } else {
463: debug("Initial X11 packet contains bad byte order byte: 0x%x",
464: ucp[0]);
465: return -1;
466: }
467:
468: /* Check if the whole packet is in buffer. */
469: if (buffer_len(&c->output) <
470: 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
471: return 0;
472:
473: /* Check if authentication protocol matches. */
474: if (proto_len != strlen(x11_saved_proto) ||
475: memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
476: debug("X11 connection uses different authentication protocol.");
477: return -1;
478: }
479: /* Check if authentication data matches our fake data. */
480: if (data_len != x11_fake_data_len ||
481: memcmp(ucp + 12 + ((proto_len + 3) & ~3),
482: x11_fake_data, x11_fake_data_len) != 0) {
483: debug("X11 auth data does not match fake data.");
484: return -1;
485: }
486: /* Check fake data length */
487: if (x11_fake_data_len != x11_saved_data_len) {
488: error("X11 fake_data_len %d != saved_data_len %d",
489: x11_fake_data_len, x11_saved_data_len);
490: return -1;
491: }
492: /*
493: * Received authentication protocol and data match
494: * our fake data. Substitute the fake data with real
495: * data.
496: */
497: memcpy(ucp + 12 + ((proto_len + 3) & ~3),
498: x11_saved_data, x11_saved_data_len);
499: return 1;
500: }
501:
502: void
503: channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
504: {
505: int ret = x11_open_helper(c);
506: if (ret == 1) {
507: /* Start normal processing for the channel. */
508: c->type = SSH_CHANNEL_OPEN;
1.47 markus 509: channel_pre_open_13(c, readset, writeset);
1.41 markus 510: } else if (ret == -1) {
511: /*
512: * We have received an X11 connection that has bad
513: * authentication information.
514: */
1.98 millert 515: log("X11 connection rejected because of wrong authentication.");
1.41 markus 516: buffer_clear(&c->input);
517: buffer_clear(&c->output);
518: close(c->sock);
519: c->sock = -1;
520: c->type = SSH_CHANNEL_CLOSED;
521: packet_start(SSH_MSG_CHANNEL_CLOSE);
522: packet_put_int(c->remote_id);
523: packet_send();
524: }
525: }
1.25 markus 526:
1.41 markus 527: void
1.51 markus 528: channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
1.41 markus 529: {
530: int ret = x11_open_helper(c);
531: if (ret == 1) {
532: c->type = SSH_CHANNEL_OPEN;
1.57 markus 533: if (compat20)
534: channel_pre_open_20(c, readset, writeset);
535: else
536: channel_pre_open_15(c, readset, writeset);
1.41 markus 537: } else if (ret == -1) {
538: debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
1.51 markus 539: chan_read_failed(c); /** force close? */
1.41 markus 540: chan_write_failed(c);
541: debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
542: }
543: }
1.25 markus 544:
1.103 markus 545:
1.104 markus 546: int
547: channel_decode_helper(Channel *c, int start, int lookfor)
548: {
549: u_char *p;
550: int i, have;
551:
552: p = buffer_ptr(&c->input);
553: have = buffer_len(&c->input);
554: debug2("channel %d: decode_helper: start %d have %d lookfor %d",
555: c->self, start, have, lookfor);
556: if (have < start)
557: return 0;
558: for (i = start; i < have; i++) {
559: if (p[i] == lookfor) {
560: debug2("channel %d: decode_helper: matched at %d",
561: c->self, i);
562: if (lookfor == '\0' ||
563: (i+3 < have &&
564: p[i+1] == '\n' &&
565: p[i+2] == '\r' &&
566: p[i+3] == '\n'))
567: return i;
568: }
569: if (i > 4096) {
570: /* the peer is probably sending garbage */
571: debug("channel %d: decode_helper: too long",
572: c->self);
573: return -1;
574: }
575: }
576: return 0; /* need more */
577: }
578:
1.106 ! markus 579: /* try to decode a http connect header */
! 580: int
! 581: channel_decode_https(Channel *c, fd_set * readset, fd_set * writeset)
! 582: {
! 583: u_char *p, *host, *buf;
! 584: int port, ret;
! 585: char httpok[] = "HTTP/1.0 200\r\n\r\n";
! 586:
! 587: debug2("channel %d: decode https connect", c->self);
! 588: ret = channel_decode_helper(c, strlen("connect "), '\r');
! 589: if (ret <= 0)
! 590: return ret;
! 591: p = buffer_ptr(&c->input);
! 592: buf = xmalloc(ret+1);
! 593: host = xmalloc(ret);
! 594: memcpy(buf, p, ret);
! 595: buf[ret] = '\0';
! 596: if (sscanf(buf, "CONNECT %[^:]:%u HTTP/", host, &port) != 2) {
! 597: debug("channel %d: cannot parse http header", c->self);
! 598: return -1;
! 599: }
! 600: debug("channel %d: dynamic request: https host %s port %u",
! 601: c->self, host, port);
! 602: strlcpy(c->path, host, sizeof(c->path));
! 603: c->host_port = port;
! 604: xfree(host);
! 605: xfree(buf);
! 606: buffer_consume(&c->input, ret+4);
! 607: buffer_append(&c->output, httpok, strlen(httpok));
! 608:
! 609: return 1;
! 610: }
! 611:
1.104 markus 612: /* try to decode a socks4 header */
613: int
614: channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
1.103 markus 615: {
616: u_char *p, *host;
1.104 markus 617: int len, have, ret;
618: char username[256];
1.103 markus 619: struct {
620: u_int8_t version;
621: u_int8_t command;
622: u_int16_t dest_port;
1.104 markus 623: struct in_addr dest_addr;
1.103 markus 624: } s4_req, s4_rsp;
625:
1.104 markus 626: debug2("channel %d: decode socks4", c->self);
627: ret = channel_decode_helper(c, sizeof(s4_req), '\0');
628: if (ret <= 0)
629: return ret;
1.103 markus 630: buffer_get(&c->input, (char *)&s4_req.version, 1);
631: buffer_get(&c->input, (char *)&s4_req.command, 1);
632: buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
1.104 markus 633: buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
1.103 markus 634: p = buffer_ptr(&c->input);
635: len = strlen(p);
636: have = buffer_len(&c->input);
1.106 ! markus 637: debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
1.103 markus 638: if (len > have)
1.104 markus 639: fatal("channel %d: decode socks4: len %d > have %d",
1.103 markus 640: c->self, len, have);
641: strlcpy(username, p, sizeof(username));
642: buffer_consume(&c->input, len);
643: buffer_consume(&c->input, 1); /* trailing '\0' */
644:
1.104 markus 645: host = inet_ntoa(s4_req.dest_addr);
1.103 markus 646: strlcpy(c->path, host, sizeof(c->path));
647: c->host_port = ntohs(s4_req.dest_port);
648:
1.106 ! markus 649: debug("channel %d: dynamic request: socks4 host %s port %u command %u",
! 650: c->self, host, c->host_port, s4_req.command);
1.103 markus 651:
1.104 markus 652: if (s4_req.command != 1) {
653: debug("channel %d: cannot handle: socks4 cn %d",
654: c->self, s4_req.command);
655: return -1;
1.103 markus 656: }
1.104 markus 657: s4_rsp.version = 0; /* vn: 0 for reply */
658: s4_rsp.command = 90; /* cd: req granted */
1.103 markus 659: s4_rsp.dest_port = 0; /* ignored */
1.104 markus 660: s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
1.103 markus 661: buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp));
1.104 markus 662: return 1;
663: }
664:
1.106 ! markus 665: /* try to decode a socks5 header */
! 666: #define SSH_SOCKS5_AUTHDONE 0x1000
! 667: #define SSH_SOCKS5_NOAUTH 0x00
! 668: #define SSH_SOCKS5_IPV4 0x01
! 669: #define SSH_SOCKS5_DOMAIN 0x03
! 670: #define SSH_SOCKS5_IPV6 0x04
! 671: #define SSH_SOCKS5_CONNECT 0x01
! 672: #define SSH_SOCKS5_SUCCESS 0x00
! 673:
! 674: int
! 675: channel_decode_socks5(Channel *c, fd_set * readset, fd_set * writeset)
! 676: {
! 677: struct {
! 678: u_int8_t version;
! 679: u_int8_t command;
! 680: u_int8_t reserved;
! 681: u_int8_t atyp;
! 682: } s5_req, s5_rsp;
! 683: u_int16_t dest_port;
! 684: u_char *p, dest_addr[255+1];
! 685: int i, have, found, nmethods, addrlen, af;
! 686:
! 687: debug2("channel %d: decode socks5", c->self);
! 688: p = buffer_ptr(&c->input);
! 689: if (p[0] != 0x05)
! 690: return -1;
! 691: have = buffer_len(&c->input);
! 692: if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
! 693: /* format: ver | nmethods | methods */
! 694: if (have < 2)
! 695: return 0;
! 696: nmethods = p[1];
! 697: if (have < nmethods + 2)
! 698: return 0;
! 699: /* look for method: "NO AUTHENTICATION REQUIRED" */
! 700: for (found = 0, i = 2 ; i < nmethods + 2; i++) {
! 701: if (p[i] == SSH_SOCKS5_NOAUTH ) {
! 702: found = 1;
! 703: break;
! 704: }
! 705: }
! 706: if (!found) {
! 707: debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
! 708: c->self);
! 709: return -1;
! 710: }
! 711: buffer_consume(&c->input, nmethods + 2);
! 712: buffer_put_char(&c->output, 0x05); /* version */
! 713: buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
! 714: FD_SET(c->sock, writeset);
! 715: c->flags |= SSH_SOCKS5_AUTHDONE;
! 716: debug2("channel %d: socks5 auth done", c->self);
! 717: return 0; /* need more */
! 718: }
! 719: debug2("channel %d: socks5 post auth", c->self);
! 720: if (have < sizeof(s5_req)+1)
! 721: return 0; /* need more */
! 722: memcpy((char *)&s5_req, p, sizeof(s5_req));
! 723: if (s5_req.version != 0x05 ||
! 724: s5_req.command != SSH_SOCKS5_CONNECT ||
! 725: s5_req.reserved != 0x00) {
! 726: debug("channel %d: only socks5 connect supported", c->self);
! 727: return -1;
! 728: }
! 729: switch(s5_req.atyp){
! 730: case SSH_SOCKS5_IPV4:
! 731: addrlen = 4;
! 732: af = AF_INET;
! 733: break;
! 734: case SSH_SOCKS5_DOMAIN:
! 735: addrlen = p[sizeof(s5_req)];
! 736: af = -1;
! 737: break;
! 738: case SSH_SOCKS5_IPV6:
! 739: addrlen = 16;
! 740: af = AF_INET6;
! 741: break;
! 742: default:
! 743: debug("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
! 744: return -1;
! 745: }
! 746: if (have < 4 + addrlen + 2)
! 747: return 0;
! 748: buffer_consume(&c->input, sizeof(s5_req));
! 749: buffer_get(&c->input, (char *)&dest_addr, addrlen);
! 750: buffer_get(&c->input, (char *)&dest_port, 2);
! 751: dest_addr[addrlen] = '\0';
! 752: if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
! 753: strlcpy(c->path, dest_addr, sizeof(c->path));
! 754: else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL)
! 755: return -1;
! 756: c->host_port = ntohs(dest_port);
! 757:
! 758: debug("channel %d: dynamic request: socks5 host %s port %u command %u",
! 759: c->self, c->path, c->host_port, s5_req.command);
! 760:
! 761: s5_rsp.version = 0x05;
! 762: s5_rsp.command = SSH_SOCKS5_SUCCESS;
! 763: s5_rsp.reserved = 0; /* ignored */
! 764: s5_rsp.atyp = SSH_SOCKS5_IPV4;
! 765: ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY;
! 766: dest_port = 0; /* ignored */
! 767:
! 768: buffer_append(&c->output, (char *)&s5_rsp, sizeof(s5_rsp));
! 769: buffer_append(&c->output, (char *)&dest_addr, sizeof(struct in_addr));
! 770: buffer_append(&c->output, (char *)&dest_port, sizeof(dest_port));
! 771: return 1;
! 772: }
! 773:
1.104 markus 774: /* dynamic port forwarding */
775: void
776: channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
777: {
778: u_char *p;
779: int have, ret;
1.103 markus 780:
1.104 markus 781: have = buffer_len(&c->input);
782:
783: debug2("channel %d: pre_dynamic: have %d", c->self, have);
1.105 markus 784: /* buffer_dump(&c->input); */
1.104 markus 785: /* check if the fixed size part of the packet is in buffer. */
786: if (have < 4) {
787: /* need more */
788: FD_SET(c->sock, readset);
789: return;
790: }
791: /* try to guess the protocol */
792: p = buffer_ptr(&c->input);
793: switch (p[0]) {
1.106 ! markus 794: case 'C':
! 795: ret = channel_decode_https(c, readset, writeset);
! 796: break;
1.104 markus 797: case 0x04:
798: ret = channel_decode_socks4(c, readset, writeset);
799: break;
800: case 0x05:
801: ret = channel_decode_socks5(c, readset, writeset);
802: break;
803: default:
804: ret = -1;
805: break;
806: }
807: if (ret < 0) {
808: channel_free(c->self);
809: } else if (ret == 0) {
810: debug2("channel %d: pre_dynamic: need more", c->self);
811: /* need more */
812: FD_SET(c->sock, readset);
813: } else {
814: /* switch to the next state */
815: c->type = SSH_CHANNEL_OPENING;
816: port_open_helper(c, "direct-tcpip");
817: }
1.103 markus 818: }
819:
1.41 markus 820: /* This is our fake X11 server socket. */
821: void
822: channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
823: {
824: struct sockaddr addr;
825: int newsock, newch;
826: socklen_t addrlen;
1.85 markus 827: char buf[16384], *remote_ipaddr;
1.51 markus 828: int remote_port;
1.25 markus 829:
1.41 markus 830: if (FD_ISSET(c->sock, readset)) {
831: debug("X11 connection requested.");
832: addrlen = sizeof(addr);
833: newsock = accept(c->sock, &addr, &addrlen);
834: if (newsock < 0) {
835: error("accept: %.100s", strerror(errno));
836: return;
837: }
1.85 markus 838: remote_ipaddr = get_peer_ipaddr(newsock);
1.51 markus 839: remote_port = get_peer_port(newsock);
1.41 markus 840: snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
1.85 markus 841: remote_ipaddr, remote_port);
1.51 markus 842:
843: newch = channel_new("x11",
844: SSH_CHANNEL_OPENING, newsock, newsock, -1,
845: c->local_window_max, c->local_maxpacket,
1.71 markus 846: 0, xstrdup(buf), 1);
1.51 markus 847: if (compat20) {
848: packet_start(SSH2_MSG_CHANNEL_OPEN);
849: packet_put_cstring("x11");
850: packet_put_int(newch);
851: packet_put_int(c->local_window_max);
852: packet_put_int(c->local_maxpacket);
1.85 markus 853: /* originator ipaddr and port */
854: packet_put_cstring(remote_ipaddr);
1.57 markus 855: if (datafellows & SSH_BUG_X11FWD) {
856: debug("ssh2 x11 bug compat mode");
857: } else {
858: packet_put_int(remote_port);
859: }
1.51 markus 860: packet_send();
861: } else {
862: packet_start(SSH_SMSG_X11_OPEN);
863: packet_put_int(newch);
864: if (have_hostname_in_open)
865: packet_put_string(buf, strlen(buf));
866: packet_send();
867: }
1.85 markus 868: xfree(remote_ipaddr);
1.41 markus 869: }
870: }
1.25 markus 871:
1.103 markus 872: void
873: port_open_helper(Channel *c, char *rtype)
874: {
875: int direct;
876: char buf[1024];
877: char *remote_ipaddr = get_peer_ipaddr(c->sock);
878: u_short remote_port = get_peer_port(c->sock);
879:
880: direct = (strcmp(rtype, "direct-tcpip") == 0);
881:
882: snprintf(buf, sizeof buf,
883: "%s: listening port %d for %.100s port %d, "
884: "connect from %.200s port %d",
885: rtype, c->listening_port, c->path, c->host_port,
886: remote_ipaddr, remote_port);
887:
888: xfree(c->remote_name);
889: c->remote_name = xstrdup(buf);
890:
891: if (compat20) {
892: packet_start(SSH2_MSG_CHANNEL_OPEN);
893: packet_put_cstring(rtype);
894: packet_put_int(c->self);
895: packet_put_int(c->local_window_max);
896: packet_put_int(c->local_maxpacket);
897: if (direct) {
898: /* target host, port */
899: packet_put_cstring(c->path);
900: packet_put_int(c->host_port);
901: } else {
902: /* listen address, port */
903: packet_put_cstring(c->path);
904: packet_put_int(c->listening_port);
905: }
906: /* originator host and port */
907: packet_put_cstring(remote_ipaddr);
908: packet_put_int(remote_port);
909: packet_send();
910: } else {
911: packet_start(SSH_MSG_PORT_OPEN);
912: packet_put_int(c->self);
913: packet_put_cstring(c->path);
914: packet_put_int(c->host_port);
915: if (have_hostname_in_open)
916: packet_put_cstring(c->remote_name);
917: packet_send();
918: }
919: xfree(remote_ipaddr);
920: }
921:
1.41 markus 922: /*
923: * This socket is listening for connections to a forwarded TCP/IP port.
924: */
925: void
926: channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
927: {
1.103 markus 928: Channel *nc;
1.41 markus 929: struct sockaddr addr;
1.103 markus 930: int newsock, newch, nextstate;
1.41 markus 931: socklen_t addrlen;
1.103 markus 932: char *rtype;
1.73 markus 933:
1.41 markus 934: if (FD_ISSET(c->sock, readset)) {
935: debug("Connection to port %d forwarding "
936: "to %.100s port %d requested.",
937: c->listening_port, c->path, c->host_port);
1.103 markus 938:
939: rtype = (c->type == SSH_CHANNEL_RPORT_LISTENER) ?
940: "forwarded-tcpip" : "direct-tcpip";
941: nextstate = (c->host_port == 0) ? SSH_CHANNEL_DYNAMIC :
942: SSH_CHANNEL_OPENING;
943:
1.41 markus 944: addrlen = sizeof(addr);
945: newsock = accept(c->sock, &addr, &addrlen);
946: if (newsock < 0) {
947: error("accept: %.100s", strerror(errno));
948: return;
949: }
1.73 markus 950: newch = channel_new(rtype,
1.103 markus 951: nextstate, newsock, newsock, -1,
1.41 markus 952: c->local_window_max, c->local_maxpacket,
1.103 markus 953: 0, xstrdup(rtype), 1);
954:
955: nc = channel_lookup(newch);
956: if (nc == NULL) {
957: error("xxx: no new channel:");
958: return;
1.41 markus 959: }
1.103 markus 960: nc->listening_port = c->listening_port;
961: nc->host_port = c->host_port;
962: strlcpy(nc->path, c->path, sizeof(nc->path));
963:
964: if (nextstate != SSH_CHANNEL_DYNAMIC)
965: port_open_helper(nc, rtype);
1.41 markus 966: }
967: }
1.25 markus 968:
1.41 markus 969: /*
970: * This is the authentication agent socket listening for connections from
971: * clients.
972: */
973: void
974: channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
975: {
976: struct sockaddr addr;
977: int newsock, newch;
978: socklen_t addrlen;
1.25 markus 979:
1.41 markus 980: if (FD_ISSET(c->sock, readset)) {
981: addrlen = sizeof(addr);
982: newsock = accept(c->sock, &addr, &addrlen);
983: if (newsock < 0) {
984: error("accept from auth socket: %.100s", strerror(errno));
985: return;
986: }
1.73 markus 987: newch = channel_new("accepted auth socket",
988: SSH_CHANNEL_OPENING, newsock, newsock, -1,
989: c->local_window_max, c->local_maxpacket,
990: 0, xstrdup("accepted auth socket"), 1);
991: if (compat20) {
992: packet_start(SSH2_MSG_CHANNEL_OPEN);
993: packet_put_cstring("auth-agent@openssh.com");
994: packet_put_int(newch);
995: packet_put_int(c->local_window_max);
996: packet_put_int(c->local_maxpacket);
997: } else {
998: packet_start(SSH_SMSG_AGENT_OPEN);
999: packet_put_int(newch);
1000: }
1.41 markus 1001: packet_send();
1002: }
1003: }
1.25 markus 1004:
1.75 markus 1005: void
1006: channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
1007: {
1008: if (FD_ISSET(c->sock, writeset)) {
1009: int err = 0;
1010: int sz = sizeof(err);
1011: c->type = SSH_CHANNEL_OPEN;
1.89 stevesk 1012: if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err, &sz) < 0) {
1.75 markus 1013: debug("getsockopt SO_ERROR failed");
1014: } else {
1015: if (err == 0) {
1016: debug("channel %d: connected)", c->self);
1017: } else {
1018: debug("channel %d: not connected: %s",
1019: c->self, strerror(err));
1020: chan_read_failed(c);
1021: chan_write_failed(c);
1022: }
1023: }
1024: }
1025: }
1026:
1.41 markus 1027: int
1028: channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
1029: {
1030: char buf[16*1024];
1031: int len;
1.25 markus 1032:
1.41 markus 1033: if (c->rfd != -1 &&
1034: FD_ISSET(c->rfd, readset)) {
1035: len = read(c->rfd, buf, sizeof(buf));
1.53 markus 1036: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1037: return 1;
1.41 markus 1038: if (len <= 0) {
1.51 markus 1039: debug("channel %d: read<=0 rfd %d len %d",
1.41 markus 1040: c->self, c->rfd, len);
1.104 markus 1041: if (c->type != SSH_CHANNEL_OPEN) {
1042: debug("channel %d: not open", c->self);
1.103 markus 1043: channel_free(c->self);
1044: return -1;
1.104 markus 1045: } else if (compat13) {
1.41 markus 1046: buffer_consume(&c->output, buffer_len(&c->output));
1047: c->type = SSH_CHANNEL_INPUT_DRAINING;
1.105 markus 1048: debug("channel %d: status set to input draining.", c->self);
1.25 markus 1049: } else {
1.41 markus 1050: chan_read_failed(c);
1.25 markus 1051: }
1.41 markus 1052: return -1;
1053: }
1.65 markus 1054: if(c->input_filter != NULL) {
1.66 markus 1055: if (c->input_filter(c, buf, len) == -1) {
1.105 markus 1056: debug("channel %d: filter stops", c->self);
1.65 markus 1057: chan_read_failed(c);
1058: }
1059: } else {
1060: buffer_append(&c->input, buf, len);
1061: }
1.41 markus 1062: }
1063: return 1;
1064: }
1065: int
1066: channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
1067: {
1.95 markus 1068: struct termios tio;
1.41 markus 1069: int len;
1.25 markus 1070:
1.41 markus 1071: /* Send buffered output data to the socket. */
1072: if (c->wfd != -1 &&
1073: FD_ISSET(c->wfd, writeset) &&
1074: buffer_len(&c->output) > 0) {
1075: len = write(c->wfd, buffer_ptr(&c->output),
1.53 markus 1076: buffer_len(&c->output));
1077: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1078: return 1;
1.41 markus 1079: if (len <= 0) {
1.104 markus 1080: if (c->type != SSH_CHANNEL_OPEN) {
1081: debug("channel %d: not open", c->self);
1082: channel_free(c->self);
1083: return -1;
1084: } else if (compat13) {
1.41 markus 1085: buffer_consume(&c->output, buffer_len(&c->output));
1.105 markus 1086: debug("channel %d: status set to input draining.", c->self);
1.41 markus 1087: c->type = SSH_CHANNEL_INPUT_DRAINING;
1088: } else {
1089: chan_write_failed(c);
1090: }
1091: return -1;
1.91 markus 1092: }
1093: if (compat20 && c->isatty) {
1094: if (tcgetattr(c->wfd, &tio) == 0 &&
1095: !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1096: /*
1097: * Simulate echo to reduce the impact of
1.96 markus 1098: * traffic analysis. We need to match the
1.95 markus 1099: * size of a SSH2_MSG_CHANNEL_DATA message
1100: * (4 byte channel id + data)
1.91 markus 1101: */
1.95 markus 1102: packet_send_ignore(4 + len);
1.91 markus 1103: packet_send();
1104: }
1.25 markus 1105: }
1.41 markus 1106: buffer_consume(&c->output, len);
1.44 markus 1107: if (compat20 && len > 0) {
1108: c->local_consumed += len;
1109: }
1110: }
1111: return 1;
1112: }
1113: int
1114: channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
1115: {
1116: char buf[16*1024];
1117: int len;
1118:
1.45 markus 1119: /** XXX handle drain efd, too */
1.44 markus 1120: if (c->efd != -1) {
1121: if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1122: FD_ISSET(c->efd, writeset) &&
1123: buffer_len(&c->extended) > 0) {
1124: len = write(c->efd, buffer_ptr(&c->extended),
1125: buffer_len(&c->extended));
1.70 markus 1126: debug2("channel %d: written %d to efd %d",
1.44 markus 1127: c->self, len, c->efd);
1.93 markus 1128: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1129: return 1;
1130: if (len <= 0) {
1131: debug2("channel %d: closing write-efd %d",
1132: c->self, c->efd);
1133: close(c->efd);
1134: c->efd = -1;
1135: } else {
1.44 markus 1136: buffer_consume(&c->extended, len);
1137: c->local_consumed += len;
1138: }
1139: } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1140: FD_ISSET(c->efd, readset)) {
1141: len = read(c->efd, buf, sizeof(buf));
1.70 markus 1142: debug2("channel %d: read %d from efd %d",
1.44 markus 1143: c->self, len, c->efd);
1.93 markus 1144: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1145: return 1;
1146: if (len <= 0) {
1147: debug2("channel %d: closing read-efd %d",
1.45 markus 1148: c->self, c->efd);
1149: close(c->efd);
1150: c->efd = -1;
1.93 markus 1151: } else {
1.44 markus 1152: buffer_append(&c->extended, buf, len);
1.93 markus 1153: }
1.44 markus 1154: }
1155: }
1156: return 1;
1157: }
1158: int
1.93 markus 1159: channel_check_window(Channel *c)
1.44 markus 1160: {
1.104 markus 1161: if (c->type == SSH_CHANNEL_OPEN &&
1162: !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
1.44 markus 1163: c->local_window < c->local_window_max/2 &&
1164: c->local_consumed > 0) {
1165: packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1166: packet_put_int(c->remote_id);
1167: packet_put_int(c->local_consumed);
1168: packet_send();
1.70 markus 1169: debug2("channel %d: window %d sent adjust %d",
1.44 markus 1170: c->self, c->local_window,
1171: c->local_consumed);
1172: c->local_window += c->local_consumed;
1173: c->local_consumed = 0;
1.1 deraadt 1174: }
1.41 markus 1175: return 1;
1.1 deraadt 1176: }
1177:
1.41 markus 1178: void
1179: channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset)
1180: {
1181: channel_handle_rfd(c, readset, writeset);
1182: channel_handle_wfd(c, readset, writeset);
1183: }
1.1 deraadt 1184:
1.41 markus 1185: void
1.44 markus 1186: channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset)
1187: {
1188: channel_handle_rfd(c, readset, writeset);
1189: channel_handle_wfd(c, readset, writeset);
1190: channel_handle_efd(c, readset, writeset);
1.93 markus 1191:
1192: channel_check_window(c);
1.44 markus 1193: }
1194:
1195: void
1.41 markus 1196: channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
1.1 deraadt 1197: {
1.41 markus 1198: int len;
1199: /* Send buffered output data to the socket. */
1200: if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1201: len = write(c->sock, buffer_ptr(&c->output),
1202: buffer_len(&c->output));
1203: if (len <= 0)
1204: buffer_consume(&c->output, buffer_len(&c->output));
1205: else
1206: buffer_consume(&c->output, len);
1207: }
1208: }
1.25 markus 1209:
1.41 markus 1210: void
1.44 markus 1211: channel_handler_init_20(void)
1212: {
1213: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20;
1.51 markus 1214: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
1.44 markus 1215: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1.73 markus 1216: channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
1.51 markus 1217: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1.73 markus 1218: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1.75 markus 1219: channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
1.103 markus 1220: channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.44 markus 1221:
1222: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2;
1223: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1.73 markus 1224: channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
1.51 markus 1225: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1.73 markus 1226: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1.75 markus 1227: channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
1.104 markus 1228: channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_2;
1.44 markus 1229: }
1230:
1231: void
1.41 markus 1232: channel_handler_init_13(void)
1233: {
1234: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1235: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1236: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1237: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1238: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1239: channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1240: channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
1.75 markus 1241: channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
1.103 markus 1242: channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.25 markus 1243:
1.41 markus 1244: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
1245: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1246: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1247: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1248: channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
1.75 markus 1249: channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
1.104 markus 1250: channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1;
1.41 markus 1251: }
1.25 markus 1252:
1.41 markus 1253: void
1254: channel_handler_init_15(void)
1255: {
1256: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15;
1.51 markus 1257: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
1.41 markus 1258: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1259: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1260: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1.75 markus 1261: channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
1.103 markus 1262: channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.25 markus 1263:
1.41 markus 1264: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1265: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1266: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1267: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
1.75 markus 1268: channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
1.104 markus 1269: channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1;
1.41 markus 1270: }
1.27 markus 1271:
1.41 markus 1272: void
1273: channel_handler_init(void)
1274: {
1275: int i;
1276: for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
1277: channel_pre[i] = NULL;
1278: channel_post[i] = NULL;
1279: }
1.44 markus 1280: if (compat20)
1281: channel_handler_init_20();
1282: else if (compat13)
1.41 markus 1283: channel_handler_init_13();
1284: else
1285: channel_handler_init_15();
1286: }
1.25 markus 1287:
1.49 markus 1288: void
1.41 markus 1289: channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
1290: {
1291: static int did_init = 0;
1292: int i;
1293: Channel *c;
1.25 markus 1294:
1.41 markus 1295: if (!did_init) {
1296: channel_handler_init();
1297: did_init = 1;
1298: }
1299: for (i = 0; i < channels_alloc; i++) {
1300: c = &channels[i];
1301: if (c->type == SSH_CHANNEL_FREE)
1302: continue;
1303: if (ftab[c->type] == NULL)
1.25 markus 1304: continue;
1.41 markus 1305: (*ftab[c->type])(c, readset, writeset);
1.93 markus 1306: if (chan_is_dead(c)) {
1307: /*
1308: * we have to remove the fd's from the select mask
1309: * before the channels are free'd and the fd's are
1310: * closed
1311: */
1312: if (c->wfd != -1)
1313: FD_CLR(c->wfd, writeset);
1314: if (c->rfd != -1)
1315: FD_CLR(c->rfd, readset);
1316: if (c->efd != -1) {
1317: if (c->extended_usage == CHAN_EXTENDED_READ)
1318: FD_CLR(c->efd, readset);
1319: if (c->extended_usage == CHAN_EXTENDED_WRITE)
1320: FD_CLR(c->efd, writeset);
1321: }
1322: channel_free(c->self);
1323: }
1.1 deraadt 1324: }
1325: }
1326:
1.49 markus 1327: void
1.100 markus 1328: channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
1329: int rekeying)
1.41 markus 1330: {
1.84 markus 1331: int n;
1332: u_int sz;
1333:
1334: n = MAX(*maxfdp, channel_max_fd);
1335:
1336: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1337: if (*readsetp == NULL || n > *maxfdp) {
1338: if (*readsetp)
1339: xfree(*readsetp);
1340: if (*writesetp)
1341: xfree(*writesetp);
1342: *readsetp = xmalloc(sz);
1343: *writesetp = xmalloc(sz);
1344: *maxfdp = n;
1345: }
1346: memset(*readsetp, 0, sz);
1347: memset(*writesetp, 0, sz);
1348:
1.100 markus 1349: if (!rekeying)
1350: channel_handler(channel_pre, *readsetp, *writesetp);
1.41 markus 1351: }
1352:
1.49 markus 1353: void
1.41 markus 1354: channel_after_select(fd_set * readset, fd_set * writeset)
1355: {
1356: channel_handler(channel_post, readset, writeset);
1357: }
1358:
1.84 markus 1359: /* If there is data to send to the connection, enqueue some of it now. */
1.1 deraadt 1360:
1.49 markus 1361: void
1.25 markus 1362: channel_output_poll()
1.1 deraadt 1363: {
1.25 markus 1364: int len, i;
1.41 markus 1365: Channel *c;
1.1 deraadt 1366:
1.25 markus 1367: for (i = 0; i < channels_alloc; i++) {
1.41 markus 1368: c = &channels[i];
1.37 markus 1369:
1.27 markus 1370: /* We are only interested in channels that can have buffered incoming data. */
1.37 markus 1371: if (compat13) {
1.41 markus 1372: if (c->type != SSH_CHANNEL_OPEN &&
1373: c->type != SSH_CHANNEL_INPUT_DRAINING)
1.37 markus 1374: continue;
1375: } else {
1.41 markus 1376: if (c->type != SSH_CHANNEL_OPEN)
1.37 markus 1377: continue;
1378: }
1.46 markus 1379: if (compat20 &&
1380: (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
1.93 markus 1381: /* XXX is this true? */
1.97 markus 1382: debug2("channel %d: no data after CLOSE", c->self);
1.44 markus 1383: continue;
1384: }
1.25 markus 1385:
1386: /* Get the amount of buffered data for this channel. */
1.93 markus 1387: if ((c->istate == CHAN_INPUT_OPEN ||
1388: c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1389: (len = buffer_len(&c->input)) > 0) {
1.27 markus 1390: /* Send some data for the other side over the secure connection. */
1.44 markus 1391: if (compat20) {
1392: if (len > c->remote_window)
1393: len = c->remote_window;
1394: if (len > c->remote_maxpacket)
1395: len = c->remote_maxpacket;
1.25 markus 1396: } else {
1.44 markus 1397: if (packet_is_interactive()) {
1398: if (len > 1024)
1399: len = 512;
1400: } else {
1401: /* Keep the packets at reasonable size. */
1402: if (len > packet_get_maxsize()/2)
1403: len = packet_get_maxsize()/2;
1404: }
1.25 markus 1405: }
1.41 markus 1406: if (len > 0) {
1.44 markus 1407: packet_start(compat20 ?
1408: SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
1.41 markus 1409: packet_put_int(c->remote_id);
1410: packet_put_string(buffer_ptr(&c->input), len);
1411: packet_send();
1412: buffer_consume(&c->input, len);
1413: c->remote_window -= len;
1414: }
1415: } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
1.25 markus 1416: if (compat13)
1417: fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
1.27 markus 1418: /*
1419: * input-buffer is empty and read-socket shutdown:
1420: * tell peer, that we will not send more data: send IEOF
1421: */
1.41 markus 1422: chan_ibuf_empty(c);
1.25 markus 1423: }
1.44 markus 1424: /* Send extended data, i.e. stderr */
1425: if (compat20 &&
1426: c->remote_window > 0 &&
1427: (len = buffer_len(&c->extended)) > 0 &&
1428: c->extended_usage == CHAN_EXTENDED_READ) {
1.93 markus 1429: debug2("channel %d: rwin %d elen %d euse %d",
1430: c->self, c->remote_window, buffer_len(&c->extended),
1431: c->extended_usage);
1.44 markus 1432: if (len > c->remote_window)
1433: len = c->remote_window;
1434: if (len > c->remote_maxpacket)
1435: len = c->remote_maxpacket;
1436: packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1437: packet_put_int(c->remote_id);
1438: packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1439: packet_put_string(buffer_ptr(&c->extended), len);
1440: packet_send();
1441: buffer_consume(&c->extended, len);
1442: c->remote_window -= len;
1.93 markus 1443: debug2("channel %d: sent ext data %d", c->self, len);
1.44 markus 1444: }
1.25 markus 1445: }
1.1 deraadt 1446: }
1447:
1.27 markus 1448: /*
1449: * This is called when a packet of type CHANNEL_DATA has just been received.
1450: * The message type has already been consumed, but channel number and data is
1451: * still there.
1452: */
1.1 deraadt 1453:
1.49 markus 1454: void
1.69 markus 1455: channel_input_data(int type, int plen, void *ctxt)
1.1 deraadt 1456: {
1.37 markus 1457: int id;
1.25 markus 1458: char *data;
1.77 markus 1459: u_int data_len;
1.41 markus 1460: Channel *c;
1.25 markus 1461:
1462: /* Get the channel number and verify it. */
1.37 markus 1463: id = packet_get_int();
1.41 markus 1464: c = channel_lookup(id);
1465: if (c == NULL)
1.37 markus 1466: packet_disconnect("Received data for nonexistent channel %d.", id);
1.25 markus 1467:
1468: /* Ignore any data for non-open channels (might happen on close) */
1.41 markus 1469: if (c->type != SSH_CHANNEL_OPEN &&
1470: c->type != SSH_CHANNEL_X11_OPEN)
1.37 markus 1471: return;
1472:
1473: /* same for protocol 1.5 if output end is no longer open */
1.41 markus 1474: if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN)
1.25 markus 1475: return;
1476:
1477: /* Get the data. */
1478: data = packet_get_string(&data_len);
1.48 markus 1479: packet_done();
1.41 markus 1480:
1.44 markus 1481: if (compat20){
1482: if (data_len > c->local_maxpacket) {
1483: log("channel %d: rcvd big packet %d, maxpack %d",
1484: c->self, data_len, c->local_maxpacket);
1485: }
1486: if (data_len > c->local_window) {
1487: log("channel %d: rcvd too much data %d, win %d",
1488: c->self, data_len, c->local_window);
1489: xfree(data);
1490: return;
1491: }
1492: c->local_window -= data_len;
1493: }else{
1494: packet_integrity_check(plen, 4 + 4 + data_len, type);
1495: }
1.41 markus 1496: buffer_append(&c->output, data, data_len);
1.25 markus 1497: xfree(data);
1.1 deraadt 1498: }
1.49 markus 1499: void
1.69 markus 1500: channel_input_extended_data(int type, int plen, void *ctxt)
1.44 markus 1501: {
1502: int id;
1503: int tcode;
1504: char *data;
1.77 markus 1505: u_int data_len;
1.44 markus 1506: Channel *c;
1507:
1508: /* Get the channel number and verify it. */
1509: id = packet_get_int();
1510: c = channel_lookup(id);
1511:
1512: if (c == NULL)
1513: packet_disconnect("Received extended_data for bad channel %d.", id);
1514: if (c->type != SSH_CHANNEL_OPEN) {
1515: log("channel %d: ext data for non open", id);
1516: return;
1517: }
1518: tcode = packet_get_int();
1519: if (c->efd == -1 ||
1520: c->extended_usage != CHAN_EXTENDED_WRITE ||
1521: tcode != SSH2_EXTENDED_DATA_STDERR) {
1522: log("channel %d: bad ext data", c->self);
1523: return;
1524: }
1525: data = packet_get_string(&data_len);
1.48 markus 1526: packet_done();
1.44 markus 1527: if (data_len > c->local_window) {
1528: log("channel %d: rcvd too much extended_data %d, win %d",
1529: c->self, data_len, c->local_window);
1530: xfree(data);
1531: return;
1532: }
1.70 markus 1533: debug2("channel %d: rcvd ext data %d", c->self, data_len);
1.44 markus 1534: c->local_window -= data_len;
1535: buffer_append(&c->extended, data, data_len);
1536: xfree(data);
1537: }
1538:
1.1 deraadt 1539:
1.27 markus 1540: /*
1541: * Returns true if no channel has too much buffered data, and false if one or
1542: * more channel is overfull.
1543: */
1.1 deraadt 1544:
1.49 markus 1545: int
1.25 markus 1546: channel_not_very_much_buffered_data()
1.1 deraadt 1547: {
1.77 markus 1548: u_int i;
1.41 markus 1549: Channel *c;
1.25 markus 1550:
1551: for (i = 0; i < channels_alloc; i++) {
1.41 markus 1552: c = &channels[i];
1553: if (c->type == SSH_CHANNEL_OPEN) {
1.44 markus 1554: if (!compat20 && buffer_len(&c->input) > packet_get_maxsize()) {
1.41 markus 1555: debug("channel %d: big input buffer %d",
1556: c->self, buffer_len(&c->input));
1.25 markus 1557: return 0;
1.41 markus 1558: }
1559: if (buffer_len(&c->output) > packet_get_maxsize()) {
1560: debug("channel %d: big output buffer %d",
1561: c->self, buffer_len(&c->output));
1.25 markus 1562: return 0;
1.41 markus 1563: }
1.25 markus 1564: }
1.1 deraadt 1565: }
1.25 markus 1566: return 1;
1.1 deraadt 1567: }
1568:
1.49 markus 1569: void
1.69 markus 1570: channel_input_ieof(int type, int plen, void *ctxt)
1.41 markus 1571: {
1572: int id;
1573: Channel *c;
1574:
1575: packet_integrity_check(plen, 4, type);
1576:
1577: id = packet_get_int();
1578: c = channel_lookup(id);
1579: if (c == NULL)
1580: packet_disconnect("Received ieof for nonexistent channel %d.", id);
1581: chan_rcvd_ieof(c);
1582: }
1.1 deraadt 1583:
1.49 markus 1584: void
1.69 markus 1585: channel_input_close(int type, int plen, void *ctxt)
1.1 deraadt 1586: {
1.41 markus 1587: int id;
1588: Channel *c;
1.1 deraadt 1589:
1.41 markus 1590: packet_integrity_check(plen, 4, type);
1591:
1592: id = packet_get_int();
1593: c = channel_lookup(id);
1594: if (c == NULL)
1595: packet_disconnect("Received close for nonexistent channel %d.", id);
1.27 markus 1596:
1597: /*
1598: * Send a confirmation that we have closed the channel and no more
1599: * data is coming for it.
1600: */
1.25 markus 1601: packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
1.41 markus 1602: packet_put_int(c->remote_id);
1.25 markus 1603: packet_send();
1604:
1.27 markus 1605: /*
1606: * If the channel is in closed state, we have sent a close request,
1607: * and the other side will eventually respond with a confirmation.
1608: * Thus, we cannot free the channel here, because then there would be
1609: * no-one to receive the confirmation. The channel gets freed when
1610: * the confirmation arrives.
1611: */
1.41 markus 1612: if (c->type != SSH_CHANNEL_CLOSED) {
1.27 markus 1613: /*
1614: * Not a closed channel - mark it as draining, which will
1615: * cause it to be freed later.
1616: */
1.41 markus 1617: buffer_consume(&c->input, buffer_len(&c->input));
1618: c->type = SSH_CHANNEL_OUTPUT_DRAINING;
1.25 markus 1619: }
1.1 deraadt 1620: }
1621:
1.41 markus 1622: /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
1.49 markus 1623: void
1.69 markus 1624: channel_input_oclose(int type, int plen, void *ctxt)
1.41 markus 1625: {
1626: int id = packet_get_int();
1627: Channel *c = channel_lookup(id);
1628: packet_integrity_check(plen, 4, type);
1629: if (c == NULL)
1630: packet_disconnect("Received oclose for nonexistent channel %d.", id);
1631: chan_rcvd_oclose(c);
1632: }
1.1 deraadt 1633:
1.49 markus 1634: void
1.69 markus 1635: channel_input_close_confirmation(int type, int plen, void *ctxt)
1.1 deraadt 1636: {
1.41 markus 1637: int id = packet_get_int();
1638: Channel *c = channel_lookup(id);
1.1 deraadt 1639:
1.48 markus 1640: packet_done();
1.41 markus 1641: if (c == NULL)
1642: packet_disconnect("Received close confirmation for "
1643: "out-of-range channel %d.", id);
1644: if (c->type != SSH_CHANNEL_CLOSED)
1645: packet_disconnect("Received close confirmation for "
1646: "non-closed channel %d (type %d).", id, c->type);
1647: channel_free(c->self);
1.1 deraadt 1648: }
1649:
1.49 markus 1650: void
1.69 markus 1651: channel_input_open_confirmation(int type, int plen, void *ctxt)
1.1 deraadt 1652: {
1.41 markus 1653: int id, remote_id;
1654: Channel *c;
1.1 deraadt 1655:
1.44 markus 1656: if (!compat20)
1657: packet_integrity_check(plen, 4 + 4, type);
1.25 markus 1658:
1.41 markus 1659: id = packet_get_int();
1660: c = channel_lookup(id);
1.25 markus 1661:
1.41 markus 1662: if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1663: packet_disconnect("Received open confirmation for "
1664: "non-opening channel %d.", id);
1665: remote_id = packet_get_int();
1.27 markus 1666: /* Record the remote channel number and mark that the channel is now open. */
1.41 markus 1667: c->remote_id = remote_id;
1668: c->type = SSH_CHANNEL_OPEN;
1.44 markus 1669:
1670: if (compat20) {
1671: c->remote_window = packet_get_int();
1672: c->remote_maxpacket = packet_get_int();
1.48 markus 1673: packet_done();
1.44 markus 1674: if (c->cb_fn != NULL && c->cb_event == type) {
1.70 markus 1675: debug2("callback start");
1.44 markus 1676: c->cb_fn(c->self, c->cb_arg);
1.70 markus 1677: debug2("callback done");
1.44 markus 1678: }
1679: debug("channel %d: open confirm rwindow %d rmax %d", c->self,
1680: c->remote_window, c->remote_maxpacket);
1681: }
1.1 deraadt 1682: }
1683:
1.49 markus 1684: void
1.69 markus 1685: channel_input_open_failure(int type, int plen, void *ctxt)
1.1 deraadt 1686: {
1.86 markus 1687: int id, reason;
1688: char *msg = NULL, *lang = NULL;
1.41 markus 1689: Channel *c;
1690:
1.44 markus 1691: if (!compat20)
1692: packet_integrity_check(plen, 4, type);
1.41 markus 1693:
1694: id = packet_get_int();
1695: c = channel_lookup(id);
1.25 markus 1696:
1.41 markus 1697: if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1698: packet_disconnect("Received open failure for "
1699: "non-opening channel %d.", id);
1.44 markus 1700: if (compat20) {
1.86 markus 1701: reason = packet_get_int();
1702: if (packet_remaining() > 0) {
1703: msg = packet_get_string(NULL);
1704: lang = packet_get_string(NULL);
1705: }
1.48 markus 1706: packet_done();
1.86 markus 1707: log("channel_open_failure: %d: reason %d %s", id,
1708: reason, msg ? msg : "<no additional info>");
1709: if (msg != NULL)
1710: xfree(msg);
1711: if (lang != NULL)
1712: xfree(lang);
1.44 markus 1713: }
1.25 markus 1714: /* Free the channel. This will also close the socket. */
1.41 markus 1715: channel_free(id);
1.1 deraadt 1716: }
1717:
1.44 markus 1718: void
1.69 markus 1719: channel_input_channel_request(int type, int plen, void *ctxt)
1.44 markus 1720: {
1721: int id;
1722: Channel *c;
1723:
1724: id = packet_get_int();
1725: c = channel_lookup(id);
1726:
1727: if (c == NULL ||
1728: (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL))
1729: packet_disconnect("Received request for "
1730: "non-open channel %d.", id);
1731: if (c->cb_fn != NULL && c->cb_event == type) {
1.70 markus 1732: debug2("callback start");
1.44 markus 1733: c->cb_fn(c->self, c->cb_arg);
1.70 markus 1734: debug2("callback done");
1.44 markus 1735: } else {
1736: char *service = packet_get_string(NULL);
1.94 markus 1737: debug("channel %d: rcvd request for %s", c->self, service);
1.70 markus 1738: debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event);
1.44 markus 1739: xfree(service);
1740: }
1741: }
1742:
1.49 markus 1743: void
1.69 markus 1744: channel_input_window_adjust(int type, int plen, void *ctxt)
1.44 markus 1745: {
1746: Channel *c;
1747: int id, adjust;
1748:
1749: if (!compat20)
1750: return;
1751:
1752: /* Get the channel number and verify it. */
1753: id = packet_get_int();
1754: c = channel_lookup(id);
1755:
1756: if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
1757: log("Received window adjust for "
1758: "non-open channel %d.", id);
1759: return;
1760: }
1761: adjust = packet_get_int();
1.48 markus 1762: packet_done();
1.70 markus 1763: debug2("channel %d: rcvd adjust %d", id, adjust);
1.44 markus 1764: c->remote_window += adjust;
1765: }
1766:
1.27 markus 1767: /*
1768: * Stops listening for channels, and removes any unix domain sockets that we
1769: * might have.
1770: */
1.1 deraadt 1771:
1.49 markus 1772: void
1.25 markus 1773: channel_stop_listening()
1.1 deraadt 1774: {
1.25 markus 1775: int i;
1776: for (i = 0; i < channels_alloc; i++) {
1777: switch (channels[i].type) {
1778: case SSH_CHANNEL_AUTH_SOCKET:
1779: close(channels[i].sock);
1.76 markus 1780: unlink(channels[i].path);
1.25 markus 1781: channel_free(i);
1782: break;
1783: case SSH_CHANNEL_PORT_LISTENER:
1.73 markus 1784: case SSH_CHANNEL_RPORT_LISTENER:
1.25 markus 1785: case SSH_CHANNEL_X11_LISTENER:
1786: close(channels[i].sock);
1787: channel_free(i);
1788: break;
1789: default:
1790: break;
1791: }
1.1 deraadt 1792: }
1793: }
1794:
1.27 markus 1795: /*
1.52 markus 1796: * Closes the sockets/fds of all channels. This is used to close extra file
1.27 markus 1797: * descriptors after a fork.
1798: */
1.1 deraadt 1799:
1.49 markus 1800: void
1.25 markus 1801: channel_close_all()
1.1 deraadt 1802: {
1.25 markus 1803: int i;
1.52 markus 1804: for (i = 0; i < channels_alloc; i++)
1.25 markus 1805: if (channels[i].type != SSH_CHANNEL_FREE)
1.52 markus 1806: channel_close_fds(&channels[i]);
1.1 deraadt 1807: }
1808:
1809: /* Returns true if any channel is still open. */
1810:
1.49 markus 1811: int
1.25 markus 1812: channel_still_open()
1.1 deraadt 1813: {
1.77 markus 1814: u_int i;
1.25 markus 1815: for (i = 0; i < channels_alloc; i++)
1816: switch (channels[i].type) {
1817: case SSH_CHANNEL_FREE:
1818: case SSH_CHANNEL_X11_LISTENER:
1819: case SSH_CHANNEL_PORT_LISTENER:
1.73 markus 1820: case SSH_CHANNEL_RPORT_LISTENER:
1.25 markus 1821: case SSH_CHANNEL_CLOSED:
1822: case SSH_CHANNEL_AUTH_SOCKET:
1.103 markus 1823: case SSH_CHANNEL_DYNAMIC:
1.75 markus 1824: case SSH_CHANNEL_CONNECTING: /* XXX ??? */
1.25 markus 1825: continue;
1.44 markus 1826: case SSH_CHANNEL_LARVAL:
1827: if (!compat20)
1828: fatal("cannot happen: SSH_CHANNEL_LARVAL");
1829: continue;
1.25 markus 1830: case SSH_CHANNEL_OPENING:
1831: case SSH_CHANNEL_OPEN:
1832: case SSH_CHANNEL_X11_OPEN:
1833: return 1;
1834: case SSH_CHANNEL_INPUT_DRAINING:
1835: case SSH_CHANNEL_OUTPUT_DRAINING:
1836: if (!compat13)
1837: fatal("cannot happen: OUT_DRAIN");
1838: return 1;
1839: default:
1840: fatal("channel_still_open: bad channel type %d", channels[i].type);
1841: /* NOTREACHED */
1842: }
1843: return 0;
1.1 deraadt 1844: }
1845:
1.27 markus 1846: /*
1847: * Returns a message describing the currently open forwarded connections,
1848: * suitable for sending to the client. The message contains crlf pairs for
1849: * newlines.
1850: */
1.1 deraadt 1851:
1.25 markus 1852: char *
1853: channel_open_message()
1.1 deraadt 1854: {
1.25 markus 1855: Buffer buffer;
1856: int i;
1857: char buf[512], *cp;
1858:
1859: buffer_init(&buffer);
1860: snprintf(buf, sizeof buf, "The following connections are open:\r\n");
1.1 deraadt 1861: buffer_append(&buffer, buf, strlen(buf));
1.25 markus 1862: for (i = 0; i < channels_alloc; i++) {
1863: Channel *c = &channels[i];
1864: switch (c->type) {
1865: case SSH_CHANNEL_FREE:
1866: case SSH_CHANNEL_X11_LISTENER:
1867: case SSH_CHANNEL_PORT_LISTENER:
1.73 markus 1868: case SSH_CHANNEL_RPORT_LISTENER:
1.25 markus 1869: case SSH_CHANNEL_CLOSED:
1870: case SSH_CHANNEL_AUTH_SOCKET:
1871: continue;
1.44 markus 1872: case SSH_CHANNEL_LARVAL:
1.25 markus 1873: case SSH_CHANNEL_OPENING:
1.75 markus 1874: case SSH_CHANNEL_CONNECTING:
1.103 markus 1875: case SSH_CHANNEL_DYNAMIC:
1.25 markus 1876: case SSH_CHANNEL_OPEN:
1877: case SSH_CHANNEL_X11_OPEN:
1878: case SSH_CHANNEL_INPUT_DRAINING:
1879: case SSH_CHANNEL_OUTPUT_DRAINING:
1.41 markus 1880: snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n",
1.37 markus 1881: c->self, c->remote_name,
1882: c->type, c->remote_id,
1883: c->istate, buffer_len(&c->input),
1.41 markus 1884: c->ostate, buffer_len(&c->output),
1885: c->rfd, c->wfd);
1.25 markus 1886: buffer_append(&buffer, buf, strlen(buf));
1887: continue;
1888: default:
1.41 markus 1889: fatal("channel_open_message: bad channel type %d", c->type);
1.25 markus 1890: /* NOTREACHED */
1891: }
1892: }
1893: buffer_append(&buffer, "\0", 1);
1894: cp = xstrdup(buffer_ptr(&buffer));
1895: buffer_free(&buffer);
1896: return cp;
1.1 deraadt 1897: }
1898:
1.27 markus 1899: /*
1900: * Initiate forwarding of connections to local port "port" through the secure
1901: * channel to host:port from remote side.
1902: */
1.87 markus 1903: int
1.73 markus 1904: channel_request_local_forwarding(u_short listen_port, const char *host_to_connect,
1905: u_short port_to_connect, int gateway_ports)
1906: {
1.87 markus 1907: return channel_request_forwarding(
1.73 markus 1908: NULL, listen_port,
1909: host_to_connect, port_to_connect,
1910: gateway_ports, /*remote_fwd*/ 0);
1911: }
1.1 deraadt 1912:
1.73 markus 1913: /*
1914: * If 'remote_fwd' is true we have a '-R style' listener for protocol 2
1915: * (SSH_CHANNEL_RPORT_LISTENER).
1916: */
1.87 markus 1917: int
1.73 markus 1918: channel_request_forwarding(
1919: const char *listen_address, u_short listen_port,
1920: const char *host_to_connect, u_short port_to_connect,
1921: int gateway_ports, int remote_fwd)
1.25 markus 1922: {
1.73 markus 1923: int success, ch, sock, on = 1, ctype;
1.35 markus 1924: struct addrinfo hints, *ai, *aitop;
1925: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
1.73 markus 1926: const char *host;
1.28 markus 1927: struct linger linger;
1.25 markus 1928:
1.87 markus 1929: success = 0;
1930:
1.73 markus 1931: if (remote_fwd) {
1932: host = listen_address;
1.89 stevesk 1933: ctype = SSH_CHANNEL_RPORT_LISTENER;
1.73 markus 1934: } else {
1935: host = host_to_connect;
1936: ctype =SSH_CHANNEL_PORT_LISTENER;
1937: }
1938:
1.87 markus 1939: if (strlen(host) > sizeof(channels[0].path) - 1) {
1940: error("Forward host name too long.");
1941: return success;
1942: }
1.25 markus 1943:
1.73 markus 1944: /* XXX listen_address is currently ignored */
1.28 markus 1945: /*
1.35 markus 1946: * getaddrinfo returns a loopback address if the hostname is
1947: * set to NULL and hints.ai_flags is not AI_PASSIVE
1.28 markus 1948: */
1.35 markus 1949: memset(&hints, 0, sizeof(hints));
1950: hints.ai_family = IPv4or6;
1951: hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
1952: hints.ai_socktype = SOCK_STREAM;
1.73 markus 1953: snprintf(strport, sizeof strport, "%d", listen_port);
1.35 markus 1954: if (getaddrinfo(NULL, strport, &hints, &aitop) != 0)
1955: packet_disconnect("getaddrinfo: fatal error");
1956:
1957: for (ai = aitop; ai; ai = ai->ai_next) {
1958: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
1959: continue;
1960: if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
1961: strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1.73 markus 1962: error("channel_request_forwarding: getnameinfo failed");
1.35 markus 1963: continue;
1964: }
1965: /* Create a port to listen for the host. */
1966: sock = socket(ai->ai_family, SOCK_STREAM, 0);
1967: if (sock < 0) {
1968: /* this is no error since kernel may not support ipv6 */
1969: verbose("socket: %.100s", strerror(errno));
1970: continue;
1971: }
1972: /*
1973: * Set socket options. We would like the socket to disappear
1974: * as soon as it has been closed for whatever reason.
1975: */
1976: setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
1977: linger.l_onoff = 1;
1978: linger.l_linger = 5;
1979: setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger));
1980: debug("Local forwarding listening on %s port %s.", ntop, strport);
1981:
1982: /* Bind the socket to the address. */
1983: if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1984: /* address can be in use ipv6 address is already bound */
1985: verbose("bind: %.100s", strerror(errno));
1986: close(sock);
1987: continue;
1988: }
1989: /* Start listening for connections on the socket. */
1990: if (listen(sock, 5) < 0) {
1991: error("listen: %.100s", strerror(errno));
1992: close(sock);
1993: continue;
1994: }
1995: /* Allocate a channel number for the socket. */
1.73 markus 1996: ch = channel_new("port listener", ctype, sock, sock, -1,
1.51 markus 1997: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1.71 markus 1998: 0, xstrdup("port listener"), 1);
1.35 markus 1999: strlcpy(channels[ch].path, host, sizeof(channels[ch].path));
1.73 markus 2000: channels[ch].host_port = port_to_connect;
2001: channels[ch].listening_port = listen_port;
1.35 markus 2002: success = 1;
2003: }
2004: if (success == 0)
1.87 markus 2005: error("channel_request_forwarding: cannot listen to port: %d",
2006: listen_port);
1.35 markus 2007: freeaddrinfo(aitop);
1.87 markus 2008: return success;
1.25 markus 2009: }
1.1 deraadt 2010:
1.27 markus 2011: /*
2012: * Initiate forwarding of connections to port "port" on remote host through
2013: * the secure channel to host:port from local side.
2014: */
1.1 deraadt 2015:
1.49 markus 2016: void
1.73 markus 2017: channel_request_remote_forwarding(u_short listen_port,
2018: const char *host_to_connect, u_short port_to_connect)
1.25 markus 2019: {
1.73 markus 2020: int payload_len, type, success = 0;
2021:
1.25 markus 2022: /* Record locally that connection to this host/port is permitted. */
2023: if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2024: fatal("channel_request_remote_forwarding: too many forwards");
2025:
2026: /* Send the forward request to the remote side. */
1.44 markus 2027: if (compat20) {
2028: const char *address_to_bind = "0.0.0.0";
2029: packet_start(SSH2_MSG_GLOBAL_REQUEST);
2030: packet_put_cstring("tcpip-forward");
2031: packet_put_char(0); /* boolean: want reply */
2032: packet_put_cstring(address_to_bind);
2033: packet_put_int(listen_port);
1.73 markus 2034: packet_send();
2035: packet_write_wait();
2036: /* Assume that server accepts the request */
2037: success = 1;
1.44 markus 2038: } else {
2039: packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
1.50 markus 2040: packet_put_int(listen_port);
2041: packet_put_cstring(host_to_connect);
1.44 markus 2042: packet_put_int(port_to_connect);
2043: packet_send();
2044: packet_write_wait();
1.73 markus 2045:
2046: /* Wait for response from the remote side. */
2047: type = packet_read(&payload_len);
2048: switch (type) {
2049: case SSH_SMSG_SUCCESS:
2050: success = 1;
2051: break;
2052: case SSH_SMSG_FAILURE:
2053: log("Warning: Server denied remote port forwarding.");
2054: break;
2055: default:
2056: /* Unknown packet */
2057: packet_disconnect("Protocol error for port forward request:"
2058: "received packet type %d.", type);
2059: }
2060: }
2061: if (success) {
2062: permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2063: permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2064: permitted_opens[num_permitted_opens].listen_port = listen_port;
2065: num_permitted_opens++;
1.44 markus 2066: }
1.1 deraadt 2067: }
2068:
1.27 markus 2069: /*
2070: * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2071: * listening for the port, and sends back a success reply (or disconnect
2072: * message if there was an error). This never returns if there was an error.
2073: */
1.1 deraadt 2074:
1.49 markus 2075: void
1.56 markus 2076: channel_input_port_forward_request(int is_root, int gateway_ports)
1.1 deraadt 2077: {
1.31 markus 2078: u_short port, host_port;
1.25 markus 2079: char *hostname;
1.1 deraadt 2080:
1.25 markus 2081: /* Get arguments from the packet. */
2082: port = packet_get_int();
2083: hostname = packet_get_string(NULL);
2084: host_port = packet_get_int();
2085:
1.27 markus 2086: /*
2087: * Check that an unprivileged user is not trying to forward a
2088: * privileged port.
2089: */
1.25 markus 2090: if (port < IPPORT_RESERVED && !is_root)
2091: packet_disconnect("Requested forwarding of port %d but user is not root.",
2092: port);
1.73 markus 2093: /* Initiate forwarding */
1.56 markus 2094: channel_request_local_forwarding(port, hostname, host_port, gateway_ports);
1.25 markus 2095:
2096: /* Free the argument string. */
2097: xfree(hostname);
1.1 deraadt 2098: }
2099:
1.99 markus 2100: /*
2101: * Permits opening to any host/port if permitted_opens[] is empty. This is
2102: * usually called by the server, because the user could connect to any port
2103: * anyway, and the server has no way to know but to trust the client anyway.
2104: */
2105: void
2106: channel_permit_all_opens()
2107: {
2108: if (num_permitted_opens == 0)
2109: all_opens_permitted = 1;
2110: }
2111:
1.101 markus 2112: void
1.99 markus 2113: channel_add_permitted_opens(char *host, int port)
2114: {
2115: if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2116: fatal("channel_request_remote_forwarding: too many forwards");
2117: debug("allow port forwarding to host %s port %d", host, port);
2118:
2119: permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2120: permitted_opens[num_permitted_opens].port_to_connect = port;
2121: num_permitted_opens++;
2122:
2123: all_opens_permitted = 0;
2124: }
2125:
1.101 markus 2126: void
1.99 markus 2127: channel_clear_permitted_opens(void)
2128: {
2129: int i;
2130:
2131: for (i = 0; i < num_permitted_opens; i++)
2132: xfree(permitted_opens[i].host_to_connect);
2133: num_permitted_opens = 0;
2134:
2135: }
2136:
2137:
2138: /* return socket to remote host, port */
1.41 markus 2139: int
1.99 markus 2140: connect_to(const char *host, u_short port)
1.41 markus 2141: {
2142: struct addrinfo hints, *ai, *aitop;
2143: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2144: int gaierr;
2145: int sock = -1;
2146:
2147: memset(&hints, 0, sizeof(hints));
2148: hints.ai_family = IPv4or6;
2149: hints.ai_socktype = SOCK_STREAM;
1.99 markus 2150: snprintf(strport, sizeof strport, "%d", port);
1.41 markus 2151: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
1.99 markus 2152: error("connect_to %.100s: unknown host (%s)", host,
2153: gai_strerror(gaierr));
1.41 markus 2154: return -1;
2155: }
2156: for (ai = aitop; ai; ai = ai->ai_next) {
2157: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2158: continue;
2159: if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2160: strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1.99 markus 2161: error("connect_to: getnameinfo failed");
1.41 markus 2162: continue;
2163: }
2164: sock = socket(ai->ai_family, SOCK_STREAM, 0);
2165: if (sock < 0) {
2166: error("socket: %.100s", strerror(errno));
2167: continue;
2168: }
1.80 markus 2169: if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0)
1.75 markus 2170: fatal("connect_to: F_SETFL: %s", strerror(errno));
2171: if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
2172: errno != EINPROGRESS) {
1.99 markus 2173: error("connect_to %.100s port %s: %.100s", ntop, strport,
1.41 markus 2174: strerror(errno));
2175: close(sock);
1.89 stevesk 2176: continue; /* fail -- try next */
1.41 markus 2177: }
2178: break; /* success */
2179:
2180: }
2181: freeaddrinfo(aitop);
2182: if (!ai) {
1.99 markus 2183: error("connect_to %.100s port %d: failed.", host, port);
1.41 markus 2184: return -1;
2185: }
2186: /* success */
2187: return sock;
2188: }
1.99 markus 2189:
1.73 markus 2190: int
2191: channel_connect_by_listen_adress(u_short listen_port)
2192: {
2193: int i;
1.99 markus 2194:
1.73 markus 2195: for (i = 0; i < num_permitted_opens; i++)
2196: if (permitted_opens[i].listen_port == listen_port)
1.99 markus 2197: return connect_to(
1.73 markus 2198: permitted_opens[i].host_to_connect,
2199: permitted_opens[i].port_to_connect);
1.74 markus 2200: error("WARNING: Server requests forwarding for unknown listen_port %d",
2201: listen_port);
1.73 markus 2202: return -1;
2203: }
2204:
1.99 markus 2205: /* Check if connecting to that port is permitted and connect. */
2206: int
2207: channel_connect_to(const char *host, u_short port)
2208: {
2209: int i, permit;
2210:
2211: permit = all_opens_permitted;
2212: if (!permit) {
2213: for (i = 0; i < num_permitted_opens; i++)
2214: if (permitted_opens[i].port_to_connect == port &&
2215: strcmp(permitted_opens[i].host_to_connect, host) == 0)
2216: permit = 1;
2217:
2218: }
2219: if (!permit) {
2220: log("Received request to connect to host %.100s port %d, "
2221: "but the request was denied.", host, port);
2222: return -1;
2223: }
2224: return connect_to(host, port);
2225: }
2226:
1.27 markus 2227: /*
2228: * This is called after receiving PORT_OPEN message. This attempts to
2229: * connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION
2230: * or CHANNEL_OPEN_FAILURE.
2231: */
1.1 deraadt 2232:
1.49 markus 2233: void
1.69 markus 2234: channel_input_port_open(int type, int plen, void *ctxt)
1.1 deraadt 2235: {
1.31 markus 2236: u_short host_port;
1.25 markus 2237: char *host, *originator_string;
1.99 markus 2238: int remote_channel, sock = -1, newch;
1.25 markus 2239:
2240: remote_channel = packet_get_int();
1.99 markus 2241: host = packet_get_string(NULL);
1.25 markus 2242: host_port = packet_get_int();
2243:
1.29 markus 2244: if (have_hostname_in_open) {
1.99 markus 2245: originator_string = packet_get_string(NULL);
1.29 markus 2246: } else {
1.25 markus 2247: originator_string = xstrdup("unknown (remote did not supply name)");
1.29 markus 2248: }
1.99 markus 2249: packet_done();
2250: sock = channel_connect_to(host, host_port);
2251: if (sock != -1) {
1.75 markus 2252: newch = channel_allocate(SSH_CHANNEL_CONNECTING,
2253: sock, originator_string);
1.41 markus 2254: channels[newch].remote_id = remote_channel;
2255:
1.99 markus 2256: /*XXX delay answer? */
1.41 markus 2257: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
2258: packet_put_int(remote_channel);
2259: packet_put_int(newch);
2260: packet_send();
2261: } else {
2262: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2263: packet_put_int(remote_channel);
2264: packet_send();
1.25 markus 2265: }
2266: xfree(host);
1.1 deraadt 2267: }
2268:
1.27 markus 2269: /*
2270: * Creates an internet domain socket for listening for X11 connections.
2271: * Returns a suitable value for the DISPLAY variable, or NULL if an error
2272: * occurs.
2273: */
1.1 deraadt 2274:
1.35 markus 2275: #define NUM_SOCKS 10
2276:
1.25 markus 2277: char *
1.33 markus 2278: x11_create_display_inet(int screen_number, int x11_display_offset)
1.1 deraadt 2279: {
1.31 markus 2280: int display_number, sock;
2281: u_short port;
1.35 markus 2282: struct addrinfo hints, *ai, *aitop;
2283: char strport[NI_MAXSERV];
2284: int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
2285: char display[512];
1.25 markus 2286: char hostname[MAXHOSTNAMELEN];
2287:
1.33 markus 2288: for (display_number = x11_display_offset;
1.25 markus 2289: display_number < MAX_DISPLAYS;
2290: display_number++) {
2291: port = 6000 + display_number;
1.35 markus 2292: memset(&hints, 0, sizeof(hints));
2293: hints.ai_family = IPv4or6;
1.36 markus 2294: hints.ai_flags = AI_PASSIVE; /* XXX loopback only ? */
1.35 markus 2295: hints.ai_socktype = SOCK_STREAM;
2296: snprintf(strport, sizeof strport, "%d", port);
2297: if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
2298: error("getaddrinfo: %.100s", gai_strerror(gaierr));
1.25 markus 2299: return NULL;
2300: }
1.35 markus 2301: for (ai = aitop; ai; ai = ai->ai_next) {
2302: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2303: continue;
2304: sock = socket(ai->ai_family, SOCK_STREAM, 0);
2305: if (sock < 0) {
2306: error("socket: %.100s", strerror(errno));
2307: return NULL;
2308: }
2309: if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2310: debug("bind port %d: %.100s", port, strerror(errno));
2311: shutdown(sock, SHUT_RDWR);
2312: close(sock);
2313: for (n = 0; n < num_socks; n++) {
2314: shutdown(socks[n], SHUT_RDWR);
2315: close(socks[n]);
2316: }
2317: num_socks = 0;
2318: break;
2319: }
2320: socks[num_socks++] = sock;
2321: if (num_socks == NUM_SOCKS)
2322: break;
1.25 markus 2323: }
1.83 stevesk 2324: freeaddrinfo(aitop);
1.35 markus 2325: if (num_socks > 0)
2326: break;
1.25 markus 2327: }
2328: if (display_number >= MAX_DISPLAYS) {
2329: error("Failed to allocate internet-domain X11 display socket.");
2330: return NULL;
2331: }
2332: /* Start listening for connections on the socket. */
1.35 markus 2333: for (n = 0; n < num_socks; n++) {
2334: sock = socks[n];
2335: if (listen(sock, 5) < 0) {
2336: error("listen: %.100s", strerror(errno));
2337: shutdown(sock, SHUT_RDWR);
2338: close(sock);
2339: return NULL;
2340: }
1.25 markus 2341: }
1.35 markus 2342:
1.25 markus 2343: /* Set up a suitable value for the DISPLAY variable. */
2344: if (gethostname(hostname, sizeof(hostname)) < 0)
2345: fatal("gethostname: %.100s", strerror(errno));
1.35 markus 2346: snprintf(display, sizeof display, "%.400s:%d.%d", hostname,
1.25 markus 2347: display_number, screen_number);
2348:
1.35 markus 2349: /* Allocate a channel for each socket. */
2350: for (n = 0; n < num_socks; n++) {
2351: sock = socks[n];
1.51 markus 2352: (void) channel_new("x11 listener",
2353: SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
2354: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.71 markus 2355: 0, xstrdup("X11 inet listener"), 1);
1.35 markus 2356: }
1.1 deraadt 2357:
1.25 markus 2358: /* Return a suitable value for the DISPLAY environment variable. */
1.35 markus 2359: return xstrdup(display);
1.1 deraadt 2360: }
2361:
2362: #ifndef X_UNIX_PATH
2363: #define X_UNIX_PATH "/tmp/.X11-unix/X"
2364: #endif
2365:
2366: static
2367: int
1.77 markus 2368: connect_local_xsocket(u_int dnr)
1.1 deraadt 2369: {
1.25 markus 2370: static const char *const x_sockets[] = {
2371: X_UNIX_PATH "%u",
2372: "/var/X/.X11-unix/X" "%u",
2373: "/usr/spool/sockets/X11/" "%u",
2374: NULL
2375: };
2376: int sock;
2377: struct sockaddr_un addr;
2378: const char *const * path;
2379:
2380: for (path = x_sockets; *path; ++path) {
2381: sock = socket(AF_UNIX, SOCK_STREAM, 0);
2382: if (sock < 0)
2383: error("socket: %.100s", strerror(errno));
2384: memset(&addr, 0, sizeof(addr));
2385: addr.sun_family = AF_UNIX;
2386: snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr);
2387: if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
2388: return sock;
2389: close(sock);
2390: }
2391: error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
2392: return -1;
1.1 deraadt 2393: }
2394:
1.51 markus 2395: int
2396: x11_connect_display(void)
1.1 deraadt 2397: {
1.51 markus 2398: int display_number, sock = 0;
1.25 markus 2399: const char *display;
1.51 markus 2400: char buf[1024], *cp;
1.35 markus 2401: struct addrinfo hints, *ai, *aitop;
2402: char strport[NI_MAXSERV];
2403: int gaierr;
1.25 markus 2404:
2405: /* Try to open a socket for the local X server. */
2406: display = getenv("DISPLAY");
2407: if (!display) {
2408: error("DISPLAY not set.");
1.51 markus 2409: return -1;
1.25 markus 2410: }
1.27 markus 2411: /*
2412: * Now we decode the value of the DISPLAY variable and make a
2413: * connection to the real X server.
2414: */
2415:
2416: /*
2417: * Check if it is a unix domain socket. Unix domain displays are in
2418: * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
2419: */
1.25 markus 2420: if (strncmp(display, "unix:", 5) == 0 ||
2421: display[0] == ':') {
2422: /* Connect to the unix domain socket. */
2423: if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
2424: error("Could not parse display number from DISPLAY: %.100s",
2425: display);
1.51 markus 2426: return -1;
1.25 markus 2427: }
2428: /* Create a socket. */
2429: sock = connect_local_xsocket(display_number);
2430: if (sock < 0)
1.51 markus 2431: return -1;
1.25 markus 2432:
2433: /* OK, we now have a connection to the display. */
1.51 markus 2434: return sock;
1.25 markus 2435: }
1.27 markus 2436: /*
2437: * Connect to an inet socket. The DISPLAY value is supposedly
2438: * hostname:d[.s], where hostname may also be numeric IP address.
2439: */
1.25 markus 2440: strncpy(buf, display, sizeof(buf));
2441: buf[sizeof(buf) - 1] = 0;
2442: cp = strchr(buf, ':');
2443: if (!cp) {
2444: error("Could not find ':' in DISPLAY: %.100s", display);
1.51 markus 2445: return -1;
1.25 markus 2446: }
2447: *cp = 0;
1.27 markus 2448: /* buf now contains the host name. But first we parse the display number. */
1.25 markus 2449: if (sscanf(cp + 1, "%d", &display_number) != 1) {
2450: error("Could not parse display number from DISPLAY: %.100s",
2451: display);
1.51 markus 2452: return -1;
1.25 markus 2453: }
1.35 markus 2454:
2455: /* Look up the host address */
2456: memset(&hints, 0, sizeof(hints));
2457: hints.ai_family = IPv4or6;
2458: hints.ai_socktype = SOCK_STREAM;
2459: snprintf(strport, sizeof strport, "%d", 6000 + display_number);
2460: if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
2461: error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
1.51 markus 2462: return -1;
1.25 markus 2463: }
1.35 markus 2464: for (ai = aitop; ai; ai = ai->ai_next) {
2465: /* Create a socket. */
2466: sock = socket(ai->ai_family, SOCK_STREAM, 0);
2467: if (sock < 0) {
2468: debug("socket: %.100s", strerror(errno));
1.41 markus 2469: continue;
2470: }
2471: /* Connect it to the display. */
2472: if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2473: debug("connect %.100s port %d: %.100s", buf,
2474: 6000 + display_number, strerror(errno));
2475: close(sock);
2476: continue;
2477: }
2478: /* Success */
2479: break;
1.35 markus 2480: }
2481: freeaddrinfo(aitop);
2482: if (!ai) {
1.49 markus 2483: error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
1.35 markus 2484: strerror(errno));
1.51 markus 2485: return -1;
1.25 markus 2486: }
1.51 markus 2487: return sock;
2488: }
2489:
2490: /*
2491: * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
2492: * the remote channel number. We should do whatever we want, and respond
2493: * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2494: */
2495:
2496: void
1.69 markus 2497: x11_input_open(int type, int plen, void *ctxt)
1.51 markus 2498: {
2499: int remote_channel, sock = 0, newch;
2500: char *remote_host;
1.77 markus 2501: u_int remote_len;
1.25 markus 2502:
1.51 markus 2503: /* Get remote channel number. */
2504: remote_channel = packet_get_int();
2505:
2506: /* Get remote originator name. */
2507: if (have_hostname_in_open) {
2508: remote_host = packet_get_string(&remote_len);
2509: remote_len += 4;
2510: } else {
2511: remote_host = xstrdup("unknown (remote did not supply name)");
2512: remote_len = 0;
2513: }
1.25 markus 2514:
1.51 markus 2515: debug("Received X11 open request.");
2516: packet_integrity_check(plen, 4 + remote_len, SSH_SMSG_X11_OPEN);
1.25 markus 2517:
1.51 markus 2518: /* Obtain a connection to the real X display. */
2519: sock = x11_connect_display();
2520: if (sock == -1) {
2521: /* Send refusal to the remote host. */
2522: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2523: packet_put_int(remote_channel);
2524: packet_send();
2525: } else {
2526: /* Allocate a channel for this connection. */
2527: newch = channel_allocate(
2528: (x11_saved_proto == NULL) ?
2529: SSH_CHANNEL_OPEN : SSH_CHANNEL_X11_OPEN,
2530: sock, remote_host);
2531: channels[newch].remote_id = remote_channel;
1.25 markus 2532:
1.51 markus 2533: /* Send a confirmation to the remote host. */
2534: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
2535: packet_put_int(remote_channel);
2536: packet_put_int(newch);
2537: packet_send();
2538: }
1.72 markus 2539: }
2540:
2541: /* dummy protocol handler that denies SSH-1 requests (agent/x11) */
2542: void
2543: deny_input_open(int type, int plen, void *ctxt)
2544: {
2545: int rchan = packet_get_int();
2546: switch(type){
2547: case SSH_SMSG_AGENT_OPEN:
2548: error("Warning: ssh server tried agent forwarding.");
2549: break;
2550: case SSH_SMSG_X11_OPEN:
2551: error("Warning: ssh server tried X11 forwarding.");
2552: break;
2553: default:
2554: error("deny_input_open: type %d plen %d", type, plen);
2555: break;
2556: }
2557: error("Warning: this is probably a break in attempt by a malicious server.");
2558: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2559: packet_put_int(rchan);
2560: packet_send();
1.1 deraadt 2561: }
2562:
1.27 markus 2563: /*
2564: * Requests forwarding of X11 connections, generates fake authentication
2565: * data, and enables authentication spoofing.
2566: */
1.1 deraadt 2567:
1.49 markus 2568: void
1.51 markus 2569: x11_request_forwarding_with_spoofing(int client_session_id,
2570: const char *proto, const char *data)
1.1 deraadt 2571: {
1.77 markus 2572: u_int data_len = (u_int) strlen(data) / 2;
1.90 markus 2573: u_int i, value, len;
1.25 markus 2574: char *new_data;
2575: int screen_number;
2576: const char *cp;
2577: u_int32_t rand = 0;
2578:
2579: cp = getenv("DISPLAY");
2580: if (cp)
2581: cp = strchr(cp, ':');
2582: if (cp)
2583: cp = strchr(cp, '.');
2584: if (cp)
2585: screen_number = atoi(cp + 1);
2586: else
2587: screen_number = 0;
2588:
2589: /* Save protocol name. */
2590: x11_saved_proto = xstrdup(proto);
2591:
1.27 markus 2592: /*
2593: * Extract real authentication data and generate fake data of the
2594: * same length.
2595: */
1.25 markus 2596: x11_saved_data = xmalloc(data_len);
2597: x11_fake_data = xmalloc(data_len);
2598: for (i = 0; i < data_len; i++) {
2599: if (sscanf(data + 2 * i, "%2x", &value) != 1)
2600: fatal("x11_request_forwarding: bad authentication data: %.100s", data);
2601: if (i % 4 == 0)
2602: rand = arc4random();
2603: x11_saved_data[i] = value;
2604: x11_fake_data[i] = rand & 0xff;
2605: rand >>= 8;
2606: }
2607: x11_saved_data_len = data_len;
2608: x11_fake_data_len = data_len;
2609:
2610: /* Convert the fake data into hex. */
1.90 markus 2611: len = 2 * data_len + 1;
2612: new_data = xmalloc(len);
1.25 markus 2613: for (i = 0; i < data_len; i++)
1.90 markus 2614: snprintf(new_data + 2 * i, len - 2 * i,
2615: "%02x", (u_char) x11_fake_data[i]);
1.25 markus 2616:
2617: /* Send the request packet. */
1.51 markus 2618: if (compat20) {
2619: channel_request_start(client_session_id, "x11-req", 0);
2620: packet_put_char(0); /* XXX bool single connection */
2621: } else {
2622: packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
2623: }
2624: packet_put_cstring(proto);
2625: packet_put_cstring(new_data);
1.25 markus 2626: packet_put_int(screen_number);
2627: packet_send();
2628: packet_write_wait();
2629: xfree(new_data);
1.1 deraadt 2630: }
2631:
2632: /* Sends a message to the server to request authentication fd forwarding. */
2633:
1.49 markus 2634: void
1.25 markus 2635: auth_request_forwarding()
1.1 deraadt 2636: {
1.25 markus 2637: packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
2638: packet_send();
2639: packet_write_wait();
1.1 deraadt 2640: }
2641:
1.27 markus 2642: /*
2643: * Returns the name of the forwarded authentication socket. Returns NULL if
2644: * there is no forwarded authentication socket. The returned value points to
2645: * a static buffer.
2646: */
1.1 deraadt 2647:
1.25 markus 2648: char *
2649: auth_get_socket_name()
1.1 deraadt 2650: {
1.25 markus 2651: return channel_forwarded_auth_socket_name;
1.1 deraadt 2652: }
2653:
1.12 markus 2654: /* removes the agent forwarding socket */
2655:
1.49 markus 2656: void
1.25 markus 2657: cleanup_socket(void)
2658: {
1.78 markus 2659: unlink(channel_forwarded_auth_socket_name);
1.25 markus 2660: rmdir(channel_forwarded_auth_socket_dir);
1.12 markus 2661: }
2662:
1.27 markus 2663: /*
1.59 markus 2664: * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
1.27 markus 2665: * This starts forwarding authentication requests.
2666: */
1.1 deraadt 2667:
1.59 markus 2668: int
1.25 markus 2669: auth_input_request_forwarding(struct passwd * pw)
1.1 deraadt 2670: {
1.25 markus 2671: int sock, newch;
2672: struct sockaddr_un sunaddr;
2673:
2674: if (auth_get_socket_name() != NULL)
2675: fatal("Protocol error: authentication forwarding requested twice.");
2676:
2677: /* Temporarily drop privileged uid for mkdir/bind. */
1.102 markus 2678: temporarily_use_uid(pw);
1.25 markus 2679:
2680: /* Allocate a buffer for the socket name, and format the name. */
2681: channel_forwarded_auth_socket_name = xmalloc(MAX_SOCKET_NAME);
2682: channel_forwarded_auth_socket_dir = xmalloc(MAX_SOCKET_NAME);
2683: strlcpy(channel_forwarded_auth_socket_dir, "/tmp/ssh-XXXXXXXX", MAX_SOCKET_NAME);
2684:
2685: /* Create private directory for socket */
1.59 markus 2686: if (mkdtemp(channel_forwarded_auth_socket_dir) == NULL) {
2687: packet_send_debug("Agent forwarding disabled: mkdtemp() failed: %.100s",
2688: strerror(errno));
2689: restore_uid();
2690: xfree(channel_forwarded_auth_socket_name);
2691: xfree(channel_forwarded_auth_socket_dir);
2692: channel_forwarded_auth_socket_name = NULL;
2693: channel_forwarded_auth_socket_dir = NULL;
2694: return 0;
2695: }
1.25 markus 2696: snprintf(channel_forwarded_auth_socket_name, MAX_SOCKET_NAME, "%s/agent.%d",
2697: channel_forwarded_auth_socket_dir, (int) getpid());
2698:
2699: if (atexit(cleanup_socket) < 0) {
2700: int saved = errno;
2701: cleanup_socket();
2702: packet_disconnect("socket: %.100s", strerror(saved));
2703: }
2704: /* Create the socket. */
2705: sock = socket(AF_UNIX, SOCK_STREAM, 0);
2706: if (sock < 0)
2707: packet_disconnect("socket: %.100s", strerror(errno));
2708:
2709: /* Bind it to the name. */
2710: memset(&sunaddr, 0, sizeof(sunaddr));
2711: sunaddr.sun_family = AF_UNIX;
2712: strncpy(sunaddr.sun_path, channel_forwarded_auth_socket_name,
2713: sizeof(sunaddr.sun_path));
2714:
2715: if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
2716: packet_disconnect("bind: %.100s", strerror(errno));
2717:
2718: /* Restore the privileged uid. */
2719: restore_uid();
2720:
2721: /* Start listening on the socket. */
2722: if (listen(sock, 5) < 0)
2723: packet_disconnect("listen: %.100s", strerror(errno));
2724:
2725: /* Allocate a channel for the authentication agent socket. */
1.73 markus 2726: newch = channel_new("auth socket",
2727: SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
2728: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
2729: 0, xstrdup("auth socket"), 1);
2730:
1.32 deraadt 2731: strlcpy(channels[newch].path, channel_forwarded_auth_socket_name,
2732: sizeof(channels[newch].path));
1.59 markus 2733: return 1;
1.1 deraadt 2734: }
2735:
2736: /* This is called to process an SSH_SMSG_AGENT_OPEN message. */
2737:
1.49 markus 2738: void
1.69 markus 2739: auth_input_open_request(int type, int plen, void *ctxt)
1.1 deraadt 2740: {
1.25 markus 2741: int remch, sock, newch;
2742: char *dummyname;
1.41 markus 2743:
2744: packet_integrity_check(plen, 4, type);
1.25 markus 2745:
2746: /* Read the remote channel number from the message. */
2747: remch = packet_get_int();
2748:
1.27 markus 2749: /*
2750: * Get a connection to the local authentication agent (this may again
2751: * get forwarded).
2752: */
1.25 markus 2753: sock = ssh_get_authentication_socket();
2754:
1.27 markus 2755: /*
2756: * If we could not connect the agent, send an error message back to
2757: * the server. This should never happen unless the agent dies,
2758: * because authentication forwarding is only enabled if we have an
2759: * agent.
2760: */
1.25 markus 2761: if (sock < 0) {
2762: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2763: packet_put_int(remch);
2764: packet_send();
2765: return;
2766: }
2767: debug("Forwarding authentication connection.");
1.1 deraadt 2768:
1.27 markus 2769: /*
2770: * Dummy host name. This will be freed when the channel is freed; it
2771: * will still be valid in the packet_put_string below since the
2772: * channel cannot yet be freed at that point.
2773: */
1.25 markus 2774: dummyname = xstrdup("authentication agent connection");
2775:
2776: newch = channel_allocate(SSH_CHANNEL_OPEN, sock, dummyname);
2777: channels[newch].remote_id = remch;
2778:
2779: /* Send a confirmation to the remote host. */
2780: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
2781: packet_put_int(remch);
2782: packet_put_int(newch);
1.44 markus 2783: packet_send();
2784: }
2785:
2786: void
1.51 markus 2787: channel_start_open(int id)
1.44 markus 2788: {
2789: Channel *c = channel_lookup(id);
2790: if (c == NULL) {
2791: log("channel_open: %d: bad id", id);
2792: return;
2793: }
1.51 markus 2794: debug("send channel open %d", id);
1.44 markus 2795: packet_start(SSH2_MSG_CHANNEL_OPEN);
2796: packet_put_cstring(c->ctype);
2797: packet_put_int(c->self);
2798: packet_put_int(c->local_window);
2799: packet_put_int(c->local_maxpacket);
1.51 markus 2800: }
2801: void
2802: channel_open(int id)
2803: {
2804: /* XXX REMOVE ME */
2805: channel_start_open(id);
1.44 markus 2806: packet_send();
2807: }
2808: void
2809: channel_request(int id, char *service, int wantconfirm)
2810: {
2811: channel_request_start(id, service, wantconfirm);
2812: packet_send();
2813: debug("channel request %d: %s", id, service) ;
2814: }
2815: void
2816: channel_request_start(int id, char *service, int wantconfirm)
2817: {
2818: Channel *c = channel_lookup(id);
2819: if (c == NULL) {
2820: log("channel_request: %d: bad id", id);
2821: return;
2822: }
2823: packet_start(SSH2_MSG_CHANNEL_REQUEST);
2824: packet_put_int(c->remote_id);
2825: packet_put_cstring(service);
2826: packet_put_char(wantconfirm);
2827: }
2828: void
2829: channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg)
2830: {
2831: Channel *c = channel_lookup(id);
2832: if (c == NULL) {
2833: log("channel_register_callback: %d: bad id", id);
2834: return;
2835: }
2836: c->cb_event = mtype;
2837: c->cb_fn = fn;
2838: c->cb_arg = arg;
2839: }
2840: void
2841: channel_register_cleanup(int id, channel_callback_fn *fn)
2842: {
2843: Channel *c = channel_lookup(id);
2844: if (c == NULL) {
2845: log("channel_register_cleanup: %d: bad id", id);
2846: return;
2847: }
2848: c->dettach_user = fn;
2849: }
2850: void
2851: channel_cancel_cleanup(int id)
2852: {
2853: Channel *c = channel_lookup(id);
2854: if (c == NULL) {
2855: log("channel_cancel_cleanup: %d: bad id", id);
2856: return;
2857: }
2858: c->dettach_user = NULL;
1.65 markus 2859: }
1.89 stevesk 2860: void
1.65 markus 2861: channel_register_filter(int id, channel_filter_fn *fn)
2862: {
2863: Channel *c = channel_lookup(id);
2864: if (c == NULL) {
2865: log("channel_register_filter: %d: bad id", id);
2866: return;
2867: }
2868: c->input_filter = fn;
1.44 markus 2869: }
2870:
2871: void
1.71 markus 2872: channel_set_fds(int id, int rfd, int wfd, int efd,
2873: int extusage, int nonblock)
1.44 markus 2874: {
2875: Channel *c = channel_lookup(id);
2876: if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
2877: fatal("channel_activate for non-larval channel %d.", id);
1.71 markus 2878: channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
1.44 markus 2879: c->type = SSH_CHANNEL_OPEN;
2880: /* XXX window size? */
1.68 markus 2881: c->local_window = c->local_window_max = c->local_maxpacket * 2;
1.44 markus 2882: packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
2883: packet_put_int(c->remote_id);
2884: packet_put_int(c->local_window);
1.25 markus 2885: packet_send();
1.1 deraadt 2886: }
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