Annotation of src/usr.bin/ssh/channels.c, Revision 1.73
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"
1.73 ! markus 43: RCSID("$OpenBSD: channels.c,v 1.72 2000/10/27 07:48:22 markus Exp $");
1.1 deraadt 44:
45: #include "ssh.h"
46: #include "packet.h"
47: #include "xmalloc.h"
48: #include "buffer.h"
49: #include "uidswap.h"
1.20 markus 50: #include "readconf.h"
1.3 deraadt 51: #include "servconf.h"
1.1 deraadt 52:
1.14 markus 53: #include "channels.h"
54: #include "nchan.h"
55: #include "compat.h"
56:
1.44 markus 57: #include "ssh2.h"
1.64 markus 58:
59: #include <openssl/rsa.h>
60: #include <openssl/dsa.h>
61: #include "key.h"
62: #include "authfd.h"
1.44 markus 63:
1.1 deraadt 64: /* Maximum number of fake X11 displays to try. */
65: #define MAX_DISPLAYS 1000
66:
1.12 markus 67: /* Max len of agent socket */
68: #define MAX_SOCKET_NAME 100
69:
1.27 markus 70: /*
71: * Pointer to an array containing all allocated channels. The array is
72: * dynamically extended as needed.
73: */
1.1 deraadt 74: static Channel *channels = NULL;
75:
1.27 markus 76: /*
77: * Size of the channel array. All slots of the array must always be
78: * initialized (at least the type field); unused slots are marked with type
79: * SSH_CHANNEL_FREE.
80: */
1.1 deraadt 81: static int channels_alloc = 0;
82:
1.27 markus 83: /*
84: * Maximum file descriptor value used in any of the channels. This is
85: * updated in channel_allocate.
86: */
1.1 deraadt 87: static int channel_max_fd_value = 0;
88:
1.12 markus 89: /* Name and directory of socket for authentication agent forwarding. */
1.1 deraadt 90: static char *channel_forwarded_auth_socket_name = NULL;
1.25 markus 91: static char *channel_forwarded_auth_socket_dir = NULL;
1.1 deraadt 92:
93: /* Saved X11 authentication protocol name. */
94: char *x11_saved_proto = NULL;
95:
96: /* Saved X11 authentication data. This is the real data. */
97: char *x11_saved_data = NULL;
98: unsigned int x11_saved_data_len = 0;
99:
1.27 markus 100: /*
101: * Fake X11 authentication data. This is what the server will be sending us;
102: * we should replace any occurrences of this by the real data.
103: */
1.1 deraadt 104: char *x11_fake_data = NULL;
105: unsigned int x11_fake_data_len;
106:
1.27 markus 107: /*
108: * Data structure for storing which hosts are permitted for forward requests.
109: * The local sides of any remote forwards are stored in this array to prevent
110: * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
111: * network (which might be behind a firewall).
112: */
1.25 markus 113: typedef struct {
1.41 markus 114: char *host_to_connect; /* Connect to 'host'. */
115: u_short port_to_connect; /* Connect to 'port'. */
116: u_short listen_port; /* Remote side should listen port number. */
1.1 deraadt 117: } ForwardPermission;
118:
119: /* List of all permitted host/port pairs to connect. */
120: static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
121: /* Number of permitted host/port pairs in the array. */
122: static int num_permitted_opens = 0;
1.27 markus 123: /*
124: * If this is true, all opens are permitted. This is the case on the server
125: * on which we have to trust the client anyway, and the user could do
126: * anything after logging in anyway.
127: */
1.1 deraadt 128: static int all_opens_permitted = 0;
129:
130: /* This is set to true if both sides support SSH_PROTOFLAG_HOST_IN_FWD_OPEN. */
131: static int have_hostname_in_open = 0;
132:
133: /* Sets specific protocol options. */
134:
1.49 markus 135: void
1.25 markus 136: channel_set_options(int hostname_in_open)
1.1 deraadt 137: {
1.25 markus 138: have_hostname_in_open = hostname_in_open;
1.1 deraadt 139: }
140:
1.27 markus 141: /*
142: * Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually
143: * called by the server, because the user could connect to any port anyway,
144: * and the server has no way to know but to trust the client anyway.
145: */
1.1 deraadt 146:
1.49 markus 147: void
1.25 markus 148: channel_permit_all_opens()
1.1 deraadt 149: {
1.25 markus 150: all_opens_permitted = 1;
1.1 deraadt 151: }
152:
1.41 markus 153: /* lookup channel by id */
154:
155: Channel *
156: channel_lookup(int id)
157: {
158: Channel *c;
1.63 provos 159: if (id < 0 || id > channels_alloc) {
1.41 markus 160: log("channel_lookup: %d: bad id", id);
161: return NULL;
162: }
163: c = &channels[id];
164: if (c->type == SSH_CHANNEL_FREE) {
165: log("channel_lookup: %d: bad id: channel free", id);
166: return NULL;
167: }
168: return c;
1.55 markus 169: }
170:
1.27 markus 171: /*
1.55 markus 172: * Register filedescriptors for a channel, used when allocating a channel or
1.52 markus 173: * when the channel consumer/producer is ready, e.g. shell exec'd
1.27 markus 174: */
1.1 deraadt 175:
1.52 markus 176: void
1.71 markus 177: channel_register_fds(Channel *c, int rfd, int wfd, int efd,
178: int extusage, int nonblock)
1.1 deraadt 179: {
1.25 markus 180: /* Update the maximum file descriptor value. */
1.41 markus 181: if (rfd > channel_max_fd_value)
182: channel_max_fd_value = rfd;
183: if (wfd > channel_max_fd_value)
184: channel_max_fd_value = wfd;
185: if (efd > channel_max_fd_value)
186: channel_max_fd_value = efd;
1.27 markus 187: /* XXX set close-on-exec -markus */
1.55 markus 188:
1.52 markus 189: c->rfd = rfd;
190: c->wfd = wfd;
191: c->sock = (rfd == wfd) ? rfd : -1;
192: c->efd = efd;
193: c->extended_usage = extusage;
1.71 markus 194:
195: /* enable nonblocking mode */
196: if (nonblock) {
197: if (rfd != -1)
198: set_nonblock(rfd);
199: if (wfd != -1)
200: set_nonblock(wfd);
201: if (efd != -1)
202: set_nonblock(efd);
203: }
1.52 markus 204: }
205:
206: /*
207: * Allocate a new channel object and set its type and socket. This will cause
208: * remote_name to be freed.
209: */
210:
211: int
212: channel_new(char *ctype, int type, int rfd, int wfd, int efd,
1.71 markus 213: int window, int maxpack, int extusage, char *remote_name, int nonblock)
1.52 markus 214: {
215: int i, found;
216: Channel *c;
1.25 markus 217:
218: /* Do initial allocation if this is the first call. */
219: if (channels_alloc == 0) {
1.44 markus 220: chan_init();
1.25 markus 221: channels_alloc = 10;
222: channels = xmalloc(channels_alloc * sizeof(Channel));
223: for (i = 0; i < channels_alloc; i++)
224: channels[i].type = SSH_CHANNEL_FREE;
1.27 markus 225: /*
226: * Kludge: arrange a call to channel_stop_listening if we
227: * terminate with fatal().
228: */
1.25 markus 229: fatal_add_cleanup((void (*) (void *)) channel_stop_listening, NULL);
230: }
231: /* Try to find a free slot where to put the new channel. */
232: for (found = -1, i = 0; i < channels_alloc; i++)
233: if (channels[i].type == SSH_CHANNEL_FREE) {
234: /* Found a free slot. */
235: found = i;
236: break;
237: }
238: if (found == -1) {
1.27 markus 239: /* There are no free slots. Take last+1 slot and expand the array. */
1.25 markus 240: found = channels_alloc;
241: channels_alloc += 10;
1.70 markus 242: debug2("channel: expanding %d", channels_alloc);
1.25 markus 243: channels = xrealloc(channels, channels_alloc * sizeof(Channel));
244: for (i = found; i < channels_alloc; i++)
245: channels[i].type = SSH_CHANNEL_FREE;
246: }
247: /* Initialize and return new channel number. */
248: c = &channels[found];
249: buffer_init(&c->input);
250: buffer_init(&c->output);
1.41 markus 251: buffer_init(&c->extended);
1.25 markus 252: chan_init_iostates(c);
1.71 markus 253: channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
1.25 markus 254: c->self = found;
255: c->type = type;
1.41 markus 256: c->ctype = ctype;
1.51 markus 257: c->local_window = window;
258: c->local_window_max = window;
259: c->local_consumed = 0;
260: c->local_maxpacket = maxpack;
1.25 markus 261: c->remote_id = -1;
262: c->remote_name = remote_name;
1.41 markus 263: c->remote_window = 0;
264: c->remote_maxpacket = 0;
265: c->cb_fn = NULL;
266: c->cb_arg = NULL;
267: c->cb_event = 0;
268: c->dettach_user = NULL;
1.65 markus 269: c->input_filter = NULL;
1.25 markus 270: debug("channel %d: new [%s]", found, remote_name);
271: return found;
1.1 deraadt 272: }
1.52 markus 273: /* old interface XXX */
1.49 markus 274: int
1.41 markus 275: channel_allocate(int type, int sock, char *remote_name)
276: {
1.71 markus 277: return channel_new("", type, sock, sock, -1, 0, 0, 0, remote_name, 1);
1.41 markus 278: }
1.1 deraadt 279:
1.52 markus 280:
281: /* Close all channel fd/socket. */
282:
283: void
284: channel_close_fds(Channel *c)
285: {
286: if (c->sock != -1) {
287: close(c->sock);
288: c->sock = -1;
289: }
290: if (c->rfd != -1) {
291: close(c->rfd);
292: c->rfd = -1;
293: }
294: if (c->wfd != -1) {
295: close(c->wfd);
296: c->wfd = -1;
297: }
298: if (c->efd != -1) {
299: close(c->efd);
300: c->efd = -1;
301: }
302: }
303:
304: /* Free the channel and close its fd/socket. */
1.1 deraadt 305:
1.49 markus 306: void
1.41 markus 307: channel_free(int id)
1.1 deraadt 308: {
1.41 markus 309: Channel *c = channel_lookup(id);
310: if (c == NULL)
311: packet_disconnect("channel free: bad local channel %d", id);
312: debug("channel_free: channel %d: status: %s", id, channel_open_message());
1.44 markus 313: if (c->dettach_user != NULL) {
314: debug("channel_free: channel %d: dettaching channel user", id);
315: c->dettach_user(c->self, NULL);
316: }
1.54 markus 317: if (c->sock != -1)
318: shutdown(c->sock, SHUT_RDWR);
1.52 markus 319: channel_close_fds(c);
1.41 markus 320: buffer_free(&c->input);
321: buffer_free(&c->output);
322: buffer_free(&c->extended);
323: c->type = SSH_CHANNEL_FREE;
324: if (c->remote_name) {
325: xfree(c->remote_name);
326: c->remote_name = NULL;
1.25 markus 327: }
1.1 deraadt 328: }
329:
1.27 markus 330: /*
1.41 markus 331: * 'channel_pre*' are called just before select() to add any bits relevant to
332: * channels in the select bitmasks.
333: */
334: /*
335: * 'channel_post*': perform any appropriate operations for channels which
336: * have events pending.
1.27 markus 337: */
1.41 markus 338: typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset);
339: chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
340: chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
341:
342: void
343: channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
344: {
345: FD_SET(c->sock, readset);
346: }
347:
348: void
349: channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
350: {
351: if (buffer_len(&c->input) < packet_get_maxsize())
352: FD_SET(c->sock, readset);
353: if (buffer_len(&c->output) > 0)
354: FD_SET(c->sock, writeset);
355: }
1.1 deraadt 356:
1.41 markus 357: void
358: channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset)
359: {
360: /* test whether sockets are 'alive' for read/write */
361: if (c->istate == CHAN_INPUT_OPEN)
362: if (buffer_len(&c->input) < packet_get_maxsize())
363: FD_SET(c->sock, readset);
364: if (c->ostate == CHAN_OUTPUT_OPEN ||
365: c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
366: if (buffer_len(&c->output) > 0) {
367: FD_SET(c->sock, writeset);
368: } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
369: chan_obuf_empty(c);
370: }
371: }
372: }
373:
374: void
1.44 markus 375: channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset)
376: {
377: if (c->istate == CHAN_INPUT_OPEN &&
378: c->remote_window > 0 &&
379: buffer_len(&c->input) < c->remote_window)
380: FD_SET(c->rfd, readset);
381: if (c->ostate == CHAN_OUTPUT_OPEN ||
382: c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
383: if (buffer_len(&c->output) > 0) {
384: FD_SET(c->wfd, writeset);
385: } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
386: chan_obuf_empty(c);
387: }
388: }
389: /** XXX check close conditions, too */
390: if (c->efd != -1) {
391: if (c->extended_usage == CHAN_EXTENDED_WRITE &&
392: buffer_len(&c->extended) > 0)
393: FD_SET(c->efd, writeset);
394: else if (c->extended_usage == CHAN_EXTENDED_READ &&
395: buffer_len(&c->extended) < c->remote_window)
396: FD_SET(c->efd, readset);
397: }
398: }
399:
400: void
1.41 markus 401: channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
402: {
403: if (buffer_len(&c->input) == 0) {
404: packet_start(SSH_MSG_CHANNEL_CLOSE);
405: packet_put_int(c->remote_id);
406: packet_send();
407: c->type = SSH_CHANNEL_CLOSED;
408: debug("Closing channel %d after input drain.", c->self);
409: }
410: }
411:
412: void
413: channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
414: {
415: if (buffer_len(&c->output) == 0)
416: channel_free(c->self);
1.49 markus 417: else
1.41 markus 418: FD_SET(c->sock, writeset);
419: }
420:
421: /*
422: * This is a special state for X11 authentication spoofing. An opened X11
423: * connection (when authentication spoofing is being done) remains in this
424: * state until the first packet has been completely read. The authentication
425: * data in that packet is then substituted by the real data if it matches the
426: * fake data, and the channel is put into normal mode.
1.51 markus 427: * XXX All this happens at the client side.
1.41 markus 428: */
429: int
430: x11_open_helper(Channel *c)
1.1 deraadt 431: {
1.25 markus 432: unsigned char *ucp;
433: unsigned int proto_len, data_len;
434:
1.41 markus 435: /* Check if the fixed size part of the packet is in buffer. */
436: if (buffer_len(&c->output) < 12)
437: return 0;
438:
439: /* Parse the lengths of variable-length fields. */
440: ucp = (unsigned char *) buffer_ptr(&c->output);
441: if (ucp[0] == 0x42) { /* Byte order MSB first. */
442: proto_len = 256 * ucp[6] + ucp[7];
443: data_len = 256 * ucp[8] + ucp[9];
444: } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
445: proto_len = ucp[6] + 256 * ucp[7];
446: data_len = ucp[8] + 256 * ucp[9];
447: } else {
448: debug("Initial X11 packet contains bad byte order byte: 0x%x",
449: ucp[0]);
450: return -1;
451: }
452:
453: /* Check if the whole packet is in buffer. */
454: if (buffer_len(&c->output) <
455: 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
456: return 0;
457:
458: /* Check if authentication protocol matches. */
459: if (proto_len != strlen(x11_saved_proto) ||
460: memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
461: debug("X11 connection uses different authentication protocol.");
462: return -1;
463: }
464: /* Check if authentication data matches our fake data. */
465: if (data_len != x11_fake_data_len ||
466: memcmp(ucp + 12 + ((proto_len + 3) & ~3),
467: x11_fake_data, x11_fake_data_len) != 0) {
468: debug("X11 auth data does not match fake data.");
469: return -1;
470: }
471: /* Check fake data length */
472: if (x11_fake_data_len != x11_saved_data_len) {
473: error("X11 fake_data_len %d != saved_data_len %d",
474: x11_fake_data_len, x11_saved_data_len);
475: return -1;
476: }
477: /*
478: * Received authentication protocol and data match
479: * our fake data. Substitute the fake data with real
480: * data.
481: */
482: memcpy(ucp + 12 + ((proto_len + 3) & ~3),
483: x11_saved_data, x11_saved_data_len);
484: return 1;
485: }
486:
487: void
488: channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
489: {
490: int ret = x11_open_helper(c);
491: if (ret == 1) {
492: /* Start normal processing for the channel. */
493: c->type = SSH_CHANNEL_OPEN;
1.47 markus 494: channel_pre_open_13(c, readset, writeset);
1.41 markus 495: } else if (ret == -1) {
496: /*
497: * We have received an X11 connection that has bad
498: * authentication information.
499: */
500: log("X11 connection rejected because of wrong authentication.\r\n");
501: buffer_clear(&c->input);
502: buffer_clear(&c->output);
503: close(c->sock);
504: c->sock = -1;
505: c->type = SSH_CHANNEL_CLOSED;
506: packet_start(SSH_MSG_CHANNEL_CLOSE);
507: packet_put_int(c->remote_id);
508: packet_send();
509: }
510: }
1.25 markus 511:
1.41 markus 512: void
1.51 markus 513: channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
1.41 markus 514: {
515: int ret = x11_open_helper(c);
516: if (ret == 1) {
517: c->type = SSH_CHANNEL_OPEN;
1.57 markus 518: if (compat20)
519: channel_pre_open_20(c, readset, writeset);
520: else
521: channel_pre_open_15(c, readset, writeset);
1.41 markus 522: } else if (ret == -1) {
523: debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
1.51 markus 524: chan_read_failed(c); /** force close? */
1.41 markus 525: chan_write_failed(c);
526: debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
527: }
528: }
1.25 markus 529:
1.41 markus 530: /* This is our fake X11 server socket. */
531: void
532: channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
533: {
534: struct sockaddr addr;
535: int newsock, newch;
536: socklen_t addrlen;
537: char buf[16384], *remote_hostname;
1.51 markus 538: int remote_port;
1.25 markus 539:
1.41 markus 540: if (FD_ISSET(c->sock, readset)) {
541: debug("X11 connection requested.");
542: addrlen = sizeof(addr);
543: newsock = accept(c->sock, &addr, &addrlen);
544: if (newsock < 0) {
545: error("accept: %.100s", strerror(errno));
546: return;
547: }
548: remote_hostname = get_remote_hostname(newsock);
1.51 markus 549: remote_port = get_peer_port(newsock);
1.41 markus 550: snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
1.51 markus 551: remote_hostname, remote_port);
552:
553: newch = channel_new("x11",
554: SSH_CHANNEL_OPENING, newsock, newsock, -1,
555: c->local_window_max, c->local_maxpacket,
1.71 markus 556: 0, xstrdup(buf), 1);
1.51 markus 557: if (compat20) {
558: packet_start(SSH2_MSG_CHANNEL_OPEN);
559: packet_put_cstring("x11");
560: packet_put_int(newch);
561: packet_put_int(c->local_window_max);
562: packet_put_int(c->local_maxpacket);
563: /* originator host and port */
564: packet_put_cstring(remote_hostname);
1.57 markus 565: if (datafellows & SSH_BUG_X11FWD) {
566: debug("ssh2 x11 bug compat mode");
567: } else {
568: packet_put_int(remote_port);
569: }
1.51 markus 570: packet_send();
571: } else {
572: packet_start(SSH_SMSG_X11_OPEN);
573: packet_put_int(newch);
574: if (have_hostname_in_open)
575: packet_put_string(buf, strlen(buf));
576: packet_send();
577: }
1.41 markus 578: xfree(remote_hostname);
579: }
580: }
1.25 markus 581:
1.41 markus 582: /*
583: * This socket is listening for connections to a forwarded TCP/IP port.
584: */
585: void
586: channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
587: {
588: struct sockaddr addr;
589: int newsock, newch;
590: socklen_t addrlen;
1.73 ! markus 591: char buf[1024], *remote_hostname, *rtype;
1.41 markus 592: int remote_port;
1.25 markus 593:
1.73 ! markus 594: rtype = (c->type == SSH_CHANNEL_RPORT_LISTENER) ?
! 595: "forwarded-tcpip" : "direct-tcpip";
! 596:
1.41 markus 597: if (FD_ISSET(c->sock, readset)) {
598: debug("Connection to port %d forwarding "
599: "to %.100s port %d requested.",
600: c->listening_port, c->path, c->host_port);
601: addrlen = sizeof(addr);
602: newsock = accept(c->sock, &addr, &addrlen);
603: if (newsock < 0) {
604: error("accept: %.100s", strerror(errno));
605: return;
606: }
607: remote_hostname = get_remote_hostname(newsock);
608: remote_port = get_peer_port(newsock);
609: snprintf(buf, sizeof buf,
610: "listen port %d for %.100s port %d, "
611: "connect from %.200s port %d",
612: c->listening_port, c->path, c->host_port,
613: remote_hostname, remote_port);
1.73 ! markus 614:
! 615: newch = channel_new(rtype,
1.41 markus 616: SSH_CHANNEL_OPENING, newsock, newsock, -1,
617: c->local_window_max, c->local_maxpacket,
1.71 markus 618: 0, xstrdup(buf), 1);
1.44 markus 619: if (compat20) {
620: packet_start(SSH2_MSG_CHANNEL_OPEN);
1.73 ! markus 621: packet_put_cstring(rtype);
1.44 markus 622: packet_put_int(newch);
623: packet_put_int(c->local_window_max);
624: packet_put_int(c->local_maxpacket);
1.73 ! markus 625: if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
! 626: /* listen address, port */
! 627: packet_put_string(c->path, strlen(c->path));
! 628: packet_put_int(c->listening_port);
! 629: } else {
! 630: /* target host, port */
! 631: packet_put_string(c->path, strlen(c->path));
! 632: packet_put_int(c->host_port);
! 633: }
1.48 markus 634: /* originator host and port */
1.44 markus 635: packet_put_cstring(remote_hostname);
636: packet_put_int(remote_port);
637: packet_send();
638: } else {
639: packet_start(SSH_MSG_PORT_OPEN);
640: packet_put_int(newch);
641: packet_put_string(c->path, strlen(c->path));
642: packet_put_int(c->host_port);
643: if (have_hostname_in_open) {
644: packet_put_string(buf, strlen(buf));
645: }
646: packet_send();
1.41 markus 647: }
648: xfree(remote_hostname);
649: }
650: }
1.25 markus 651:
1.41 markus 652: /*
653: * This is the authentication agent socket listening for connections from
654: * clients.
655: */
656: void
657: channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
658: {
659: struct sockaddr addr;
660: int newsock, newch;
661: socklen_t addrlen;
1.25 markus 662:
1.41 markus 663: if (FD_ISSET(c->sock, readset)) {
664: addrlen = sizeof(addr);
665: newsock = accept(c->sock, &addr, &addrlen);
666: if (newsock < 0) {
667: error("accept from auth socket: %.100s", strerror(errno));
668: return;
669: }
1.73 ! markus 670: newch = channel_new("accepted auth socket",
! 671: SSH_CHANNEL_OPENING, newsock, newsock, -1,
! 672: c->local_window_max, c->local_maxpacket,
! 673: 0, xstrdup("accepted auth socket"), 1);
! 674: if (compat20) {
! 675: packet_start(SSH2_MSG_CHANNEL_OPEN);
! 676: packet_put_cstring("auth-agent@openssh.com");
! 677: packet_put_int(newch);
! 678: packet_put_int(c->local_window_max);
! 679: packet_put_int(c->local_maxpacket);
! 680: } else {
! 681: packet_start(SSH_SMSG_AGENT_OPEN);
! 682: packet_put_int(newch);
! 683: }
1.41 markus 684: packet_send();
685: }
686: }
1.25 markus 687:
1.41 markus 688: int
689: channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
690: {
691: char buf[16*1024];
692: int len;
1.25 markus 693:
1.41 markus 694: if (c->rfd != -1 &&
695: FD_ISSET(c->rfd, readset)) {
696: len = read(c->rfd, buf, sizeof(buf));
1.53 markus 697: if (len < 0 && (errno == EINTR || errno == EAGAIN))
698: return 1;
1.41 markus 699: if (len <= 0) {
1.51 markus 700: debug("channel %d: read<=0 rfd %d len %d",
1.41 markus 701: c->self, c->rfd, len);
1.25 markus 702: if (compat13) {
1.41 markus 703: buffer_consume(&c->output, buffer_len(&c->output));
704: c->type = SSH_CHANNEL_INPUT_DRAINING;
705: debug("Channel %d status set to input draining.", c->self);
1.25 markus 706: } else {
1.41 markus 707: chan_read_failed(c);
1.25 markus 708: }
1.41 markus 709: return -1;
710: }
1.65 markus 711: if(c->input_filter != NULL) {
1.66 markus 712: if (c->input_filter(c, buf, len) == -1) {
1.65 markus 713: debug("filter stops channel %d", c->self);
714: chan_read_failed(c);
715: }
716: } else {
717: buffer_append(&c->input, buf, len);
718: }
1.41 markus 719: }
720: return 1;
721: }
722: int
723: channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
724: {
725: int len;
1.25 markus 726:
1.41 markus 727: /* Send buffered output data to the socket. */
728: if (c->wfd != -1 &&
729: FD_ISSET(c->wfd, writeset) &&
730: buffer_len(&c->output) > 0) {
731: len = write(c->wfd, buffer_ptr(&c->output),
1.53 markus 732: buffer_len(&c->output));
733: if (len < 0 && (errno == EINTR || errno == EAGAIN))
734: return 1;
1.41 markus 735: if (len <= 0) {
736: if (compat13) {
737: buffer_consume(&c->output, buffer_len(&c->output));
738: debug("Channel %d status set to input draining.", c->self);
739: c->type = SSH_CHANNEL_INPUT_DRAINING;
740: } else {
741: chan_write_failed(c);
742: }
743: return -1;
1.25 markus 744: }
1.41 markus 745: buffer_consume(&c->output, len);
1.44 markus 746: if (compat20 && len > 0) {
747: c->local_consumed += len;
748: }
749: }
750: return 1;
751: }
752: int
753: channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
754: {
755: char buf[16*1024];
756: int len;
757:
1.45 markus 758: /** XXX handle drain efd, too */
1.44 markus 759: if (c->efd != -1) {
760: if (c->extended_usage == CHAN_EXTENDED_WRITE &&
761: FD_ISSET(c->efd, writeset) &&
762: buffer_len(&c->extended) > 0) {
763: len = write(c->efd, buffer_ptr(&c->extended),
764: buffer_len(&c->extended));
1.70 markus 765: debug2("channel %d: written %d to efd %d",
1.44 markus 766: c->self, len, c->efd);
767: if (len > 0) {
768: buffer_consume(&c->extended, len);
769: c->local_consumed += len;
770: }
771: } else if (c->extended_usage == CHAN_EXTENDED_READ &&
772: FD_ISSET(c->efd, readset)) {
773: len = read(c->efd, buf, sizeof(buf));
1.70 markus 774: debug2("channel %d: read %d from efd %d",
1.44 markus 775: c->self, len, c->efd);
1.45 markus 776: if (len == 0) {
777: debug("channel %d: closing efd %d",
778: c->self, c->efd);
779: close(c->efd);
780: c->efd = -1;
781: } else if (len > 0)
1.44 markus 782: buffer_append(&c->extended, buf, len);
783: }
784: }
785: return 1;
786: }
787: int
788: channel_check_window(Channel *c, fd_set * readset, fd_set * writeset)
789: {
1.46 markus 790: if (!(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
1.44 markus 791: c->local_window < c->local_window_max/2 &&
792: c->local_consumed > 0) {
793: packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
794: packet_put_int(c->remote_id);
795: packet_put_int(c->local_consumed);
796: packet_send();
1.70 markus 797: debug2("channel %d: window %d sent adjust %d",
1.44 markus 798: c->self, c->local_window,
799: c->local_consumed);
800: c->local_window += c->local_consumed;
801: c->local_consumed = 0;
1.1 deraadt 802: }
1.41 markus 803: return 1;
1.1 deraadt 804: }
805:
1.41 markus 806: void
807: channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset)
808: {
809: channel_handle_rfd(c, readset, writeset);
810: channel_handle_wfd(c, readset, writeset);
811: }
1.1 deraadt 812:
1.41 markus 813: void
1.44 markus 814: channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset)
815: {
816: channel_handle_rfd(c, readset, writeset);
817: channel_handle_wfd(c, readset, writeset);
818: channel_handle_efd(c, readset, writeset);
819: channel_check_window(c, readset, writeset);
820: }
821:
822: void
1.41 markus 823: channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
1.1 deraadt 824: {
1.41 markus 825: int len;
826: /* Send buffered output data to the socket. */
827: if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
828: len = write(c->sock, buffer_ptr(&c->output),
829: buffer_len(&c->output));
830: if (len <= 0)
831: buffer_consume(&c->output, buffer_len(&c->output));
832: else
833: buffer_consume(&c->output, len);
834: }
835: }
1.25 markus 836:
1.41 markus 837: void
1.44 markus 838: channel_handler_init_20(void)
839: {
840: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20;
1.51 markus 841: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
1.44 markus 842: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1.73 ! markus 843: channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
1.51 markus 844: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1.73 ! markus 845: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1.44 markus 846:
847: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2;
848: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1.73 ! markus 849: channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
1.51 markus 850: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1.73 ! markus 851: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1.44 markus 852: }
853:
854: void
1.41 markus 855: channel_handler_init_13(void)
856: {
857: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
858: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
859: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
860: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
861: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
862: channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
863: channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
1.25 markus 864:
1.41 markus 865: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
866: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
867: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
868: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
869: channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
870: }
1.25 markus 871:
1.41 markus 872: void
873: channel_handler_init_15(void)
874: {
875: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15;
1.51 markus 876: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
1.41 markus 877: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
878: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
879: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1.25 markus 880:
1.41 markus 881: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
882: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
883: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
884: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
885: }
1.27 markus 886:
1.41 markus 887: void
888: channel_handler_init(void)
889: {
890: int i;
891: for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
892: channel_pre[i] = NULL;
893: channel_post[i] = NULL;
894: }
1.44 markus 895: if (compat20)
896: channel_handler_init_20();
897: else if (compat13)
1.41 markus 898: channel_handler_init_13();
899: else
900: channel_handler_init_15();
901: }
1.25 markus 902:
1.49 markus 903: void
1.41 markus 904: channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
905: {
906: static int did_init = 0;
907: int i;
908: Channel *c;
1.25 markus 909:
1.41 markus 910: if (!did_init) {
911: channel_handler_init();
912: did_init = 1;
913: }
914: for (i = 0; i < channels_alloc; i++) {
915: c = &channels[i];
916: if (c->type == SSH_CHANNEL_FREE)
917: continue;
918: if (ftab[c->type] == NULL)
1.25 markus 919: continue;
1.41 markus 920: (*ftab[c->type])(c, readset, writeset);
1.44 markus 921: chan_delete_if_full_closed(c);
1.1 deraadt 922: }
923: }
924:
1.49 markus 925: void
1.41 markus 926: channel_prepare_select(fd_set * readset, fd_set * writeset)
927: {
928: channel_handler(channel_pre, readset, writeset);
929: }
930:
1.49 markus 931: void
1.41 markus 932: channel_after_select(fd_set * readset, fd_set * writeset)
933: {
934: channel_handler(channel_post, readset, writeset);
935: }
936:
1.1 deraadt 937: /* If there is data to send to the connection, send some of it now. */
938:
1.49 markus 939: void
1.25 markus 940: channel_output_poll()
1.1 deraadt 941: {
1.25 markus 942: int len, i;
1.41 markus 943: Channel *c;
1.1 deraadt 944:
1.25 markus 945: for (i = 0; i < channels_alloc; i++) {
1.41 markus 946: c = &channels[i];
1.37 markus 947:
1.27 markus 948: /* We are only interested in channels that can have buffered incoming data. */
1.37 markus 949: if (compat13) {
1.41 markus 950: if (c->type != SSH_CHANNEL_OPEN &&
951: c->type != SSH_CHANNEL_INPUT_DRAINING)
1.37 markus 952: continue;
953: } else {
1.41 markus 954: if (c->type != SSH_CHANNEL_OPEN)
1.37 markus 955: continue;
1.41 markus 956: if (c->istate != CHAN_INPUT_OPEN &&
957: c->istate != CHAN_INPUT_WAIT_DRAIN)
1.37 markus 958: continue;
959: }
1.46 markus 960: if (compat20 &&
961: (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
1.44 markus 962: debug("channel: %d: no data after CLOSE", c->self);
963: continue;
964: }
1.25 markus 965:
966: /* Get the amount of buffered data for this channel. */
1.41 markus 967: len = buffer_len(&c->input);
1.25 markus 968: if (len > 0) {
1.27 markus 969: /* Send some data for the other side over the secure connection. */
1.44 markus 970: if (compat20) {
971: if (len > c->remote_window)
972: len = c->remote_window;
973: if (len > c->remote_maxpacket)
974: len = c->remote_maxpacket;
1.25 markus 975: } else {
1.44 markus 976: if (packet_is_interactive()) {
977: if (len > 1024)
978: len = 512;
979: } else {
980: /* Keep the packets at reasonable size. */
981: if (len > packet_get_maxsize()/2)
982: len = packet_get_maxsize()/2;
983: }
1.25 markus 984: }
1.41 markus 985: if (len > 0) {
1.44 markus 986: packet_start(compat20 ?
987: SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
1.41 markus 988: packet_put_int(c->remote_id);
989: packet_put_string(buffer_ptr(&c->input), len);
990: packet_send();
991: buffer_consume(&c->input, len);
992: c->remote_window -= len;
993: }
994: } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
1.25 markus 995: if (compat13)
996: fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
1.27 markus 997: /*
998: * input-buffer is empty and read-socket shutdown:
999: * tell peer, that we will not send more data: send IEOF
1000: */
1.41 markus 1001: chan_ibuf_empty(c);
1.25 markus 1002: }
1.44 markus 1003: /* Send extended data, i.e. stderr */
1004: if (compat20 &&
1005: c->remote_window > 0 &&
1006: (len = buffer_len(&c->extended)) > 0 &&
1007: c->extended_usage == CHAN_EXTENDED_READ) {
1008: if (len > c->remote_window)
1009: len = c->remote_window;
1010: if (len > c->remote_maxpacket)
1011: len = c->remote_maxpacket;
1012: packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1013: packet_put_int(c->remote_id);
1014: packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1015: packet_put_string(buffer_ptr(&c->extended), len);
1016: packet_send();
1017: buffer_consume(&c->extended, len);
1018: c->remote_window -= len;
1019: }
1.25 markus 1020: }
1.1 deraadt 1021: }
1022:
1.27 markus 1023: /*
1024: * This is called when a packet of type CHANNEL_DATA has just been received.
1025: * The message type has already been consumed, but channel number and data is
1026: * still there.
1027: */
1.1 deraadt 1028:
1.49 markus 1029: void
1.69 markus 1030: channel_input_data(int type, int plen, void *ctxt)
1.1 deraadt 1031: {
1.37 markus 1032: int id;
1.25 markus 1033: char *data;
1034: unsigned int data_len;
1.41 markus 1035: Channel *c;
1.25 markus 1036:
1037: /* Get the channel number and verify it. */
1.37 markus 1038: id = packet_get_int();
1.41 markus 1039: c = channel_lookup(id);
1040: if (c == NULL)
1.37 markus 1041: packet_disconnect("Received data for nonexistent channel %d.", id);
1.25 markus 1042:
1043: /* Ignore any data for non-open channels (might happen on close) */
1.41 markus 1044: if (c->type != SSH_CHANNEL_OPEN &&
1045: c->type != SSH_CHANNEL_X11_OPEN)
1.37 markus 1046: return;
1047:
1048: /* same for protocol 1.5 if output end is no longer open */
1.41 markus 1049: if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN)
1.25 markus 1050: return;
1051:
1052: /* Get the data. */
1053: data = packet_get_string(&data_len);
1.48 markus 1054: packet_done();
1.41 markus 1055:
1.44 markus 1056: if (compat20){
1057: if (data_len > c->local_maxpacket) {
1058: log("channel %d: rcvd big packet %d, maxpack %d",
1059: c->self, data_len, c->local_maxpacket);
1060: }
1061: if (data_len > c->local_window) {
1062: log("channel %d: rcvd too much data %d, win %d",
1063: c->self, data_len, c->local_window);
1064: xfree(data);
1065: return;
1066: }
1067: c->local_window -= data_len;
1068: }else{
1069: packet_integrity_check(plen, 4 + 4 + data_len, type);
1070: }
1.41 markus 1071: buffer_append(&c->output, data, data_len);
1.25 markus 1072: xfree(data);
1.1 deraadt 1073: }
1.49 markus 1074: void
1.69 markus 1075: channel_input_extended_data(int type, int plen, void *ctxt)
1.44 markus 1076: {
1077: int id;
1078: int tcode;
1079: char *data;
1080: unsigned int data_len;
1081: Channel *c;
1082:
1083: /* Get the channel number and verify it. */
1084: id = packet_get_int();
1085: c = channel_lookup(id);
1086:
1087: if (c == NULL)
1088: packet_disconnect("Received extended_data for bad channel %d.", id);
1089: if (c->type != SSH_CHANNEL_OPEN) {
1090: log("channel %d: ext data for non open", id);
1091: return;
1092: }
1093: tcode = packet_get_int();
1094: if (c->efd == -1 ||
1095: c->extended_usage != CHAN_EXTENDED_WRITE ||
1096: tcode != SSH2_EXTENDED_DATA_STDERR) {
1097: log("channel %d: bad ext data", c->self);
1098: return;
1099: }
1100: data = packet_get_string(&data_len);
1.48 markus 1101: packet_done();
1.44 markus 1102: if (data_len > c->local_window) {
1103: log("channel %d: rcvd too much extended_data %d, win %d",
1104: c->self, data_len, c->local_window);
1105: xfree(data);
1106: return;
1107: }
1.70 markus 1108: debug2("channel %d: rcvd ext data %d", c->self, data_len);
1.44 markus 1109: c->local_window -= data_len;
1110: buffer_append(&c->extended, data, data_len);
1111: xfree(data);
1112: }
1113:
1.1 deraadt 1114:
1.27 markus 1115: /*
1116: * Returns true if no channel has too much buffered data, and false if one or
1117: * more channel is overfull.
1118: */
1.1 deraadt 1119:
1.49 markus 1120: int
1.25 markus 1121: channel_not_very_much_buffered_data()
1.1 deraadt 1122: {
1.25 markus 1123: unsigned int i;
1.41 markus 1124: Channel *c;
1.25 markus 1125:
1126: for (i = 0; i < channels_alloc; i++) {
1.41 markus 1127: c = &channels[i];
1128: if (c->type == SSH_CHANNEL_OPEN) {
1.44 markus 1129: if (!compat20 && buffer_len(&c->input) > packet_get_maxsize()) {
1.41 markus 1130: debug("channel %d: big input buffer %d",
1131: c->self, buffer_len(&c->input));
1.25 markus 1132: return 0;
1.41 markus 1133: }
1134: if (buffer_len(&c->output) > packet_get_maxsize()) {
1135: debug("channel %d: big output buffer %d",
1136: c->self, buffer_len(&c->output));
1.25 markus 1137: return 0;
1.41 markus 1138: }
1.25 markus 1139: }
1.1 deraadt 1140: }
1.25 markus 1141: return 1;
1.1 deraadt 1142: }
1143:
1.49 markus 1144: void
1.69 markus 1145: channel_input_ieof(int type, int plen, void *ctxt)
1.41 markus 1146: {
1147: int id;
1148: Channel *c;
1149:
1150: packet_integrity_check(plen, 4, type);
1151:
1152: id = packet_get_int();
1153: c = channel_lookup(id);
1154: if (c == NULL)
1155: packet_disconnect("Received ieof for nonexistent channel %d.", id);
1156: chan_rcvd_ieof(c);
1157: }
1.1 deraadt 1158:
1.49 markus 1159: void
1.69 markus 1160: channel_input_close(int type, int plen, void *ctxt)
1.1 deraadt 1161: {
1.41 markus 1162: int id;
1163: Channel *c;
1.1 deraadt 1164:
1.41 markus 1165: packet_integrity_check(plen, 4, type);
1166:
1167: id = packet_get_int();
1168: c = channel_lookup(id);
1169: if (c == NULL)
1170: packet_disconnect("Received close for nonexistent channel %d.", id);
1.27 markus 1171:
1172: /*
1173: * Send a confirmation that we have closed the channel and no more
1174: * data is coming for it.
1175: */
1.25 markus 1176: packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
1.41 markus 1177: packet_put_int(c->remote_id);
1.25 markus 1178: packet_send();
1179:
1.27 markus 1180: /*
1181: * If the channel is in closed state, we have sent a close request,
1182: * and the other side will eventually respond with a confirmation.
1183: * Thus, we cannot free the channel here, because then there would be
1184: * no-one to receive the confirmation. The channel gets freed when
1185: * the confirmation arrives.
1186: */
1.41 markus 1187: if (c->type != SSH_CHANNEL_CLOSED) {
1.27 markus 1188: /*
1189: * Not a closed channel - mark it as draining, which will
1190: * cause it to be freed later.
1191: */
1.41 markus 1192: buffer_consume(&c->input, buffer_len(&c->input));
1193: c->type = SSH_CHANNEL_OUTPUT_DRAINING;
1.25 markus 1194: }
1.1 deraadt 1195: }
1196:
1.41 markus 1197: /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
1.49 markus 1198: void
1.69 markus 1199: channel_input_oclose(int type, int plen, void *ctxt)
1.41 markus 1200: {
1201: int id = packet_get_int();
1202: Channel *c = channel_lookup(id);
1203: packet_integrity_check(plen, 4, type);
1204: if (c == NULL)
1205: packet_disconnect("Received oclose for nonexistent channel %d.", id);
1206: chan_rcvd_oclose(c);
1207: }
1.1 deraadt 1208:
1.49 markus 1209: void
1.69 markus 1210: channel_input_close_confirmation(int type, int plen, void *ctxt)
1.1 deraadt 1211: {
1.41 markus 1212: int id = packet_get_int();
1213: Channel *c = channel_lookup(id);
1.1 deraadt 1214:
1.48 markus 1215: packet_done();
1.41 markus 1216: if (c == NULL)
1217: packet_disconnect("Received close confirmation for "
1218: "out-of-range channel %d.", id);
1219: if (c->type != SSH_CHANNEL_CLOSED)
1220: packet_disconnect("Received close confirmation for "
1221: "non-closed channel %d (type %d).", id, c->type);
1222: channel_free(c->self);
1.1 deraadt 1223: }
1224:
1.49 markus 1225: void
1.69 markus 1226: channel_input_open_confirmation(int type, int plen, void *ctxt)
1.1 deraadt 1227: {
1.41 markus 1228: int id, remote_id;
1229: Channel *c;
1.1 deraadt 1230:
1.44 markus 1231: if (!compat20)
1232: packet_integrity_check(plen, 4 + 4, type);
1.25 markus 1233:
1.41 markus 1234: id = packet_get_int();
1235: c = channel_lookup(id);
1.25 markus 1236:
1.41 markus 1237: if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1238: packet_disconnect("Received open confirmation for "
1239: "non-opening channel %d.", id);
1240: remote_id = packet_get_int();
1.27 markus 1241: /* Record the remote channel number and mark that the channel is now open. */
1.41 markus 1242: c->remote_id = remote_id;
1243: c->type = SSH_CHANNEL_OPEN;
1.44 markus 1244:
1245: if (compat20) {
1246: c->remote_window = packet_get_int();
1247: c->remote_maxpacket = packet_get_int();
1.48 markus 1248: packet_done();
1.44 markus 1249: if (c->cb_fn != NULL && c->cb_event == type) {
1.70 markus 1250: debug2("callback start");
1.44 markus 1251: c->cb_fn(c->self, c->cb_arg);
1.70 markus 1252: debug2("callback done");
1.44 markus 1253: }
1254: debug("channel %d: open confirm rwindow %d rmax %d", c->self,
1255: c->remote_window, c->remote_maxpacket);
1256: }
1.1 deraadt 1257: }
1258:
1.49 markus 1259: void
1.69 markus 1260: channel_input_open_failure(int type, int plen, void *ctxt)
1.1 deraadt 1261: {
1.41 markus 1262: int id;
1263: Channel *c;
1264:
1.44 markus 1265: if (!compat20)
1266: packet_integrity_check(plen, 4, type);
1.41 markus 1267:
1268: id = packet_get_int();
1269: c = channel_lookup(id);
1.25 markus 1270:
1.41 markus 1271: if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1272: packet_disconnect("Received open failure for "
1273: "non-opening channel %d.", id);
1.44 markus 1274: if (compat20) {
1275: int reason = packet_get_int();
1276: char *msg = packet_get_string(NULL);
1.48 markus 1277: char *lang = packet_get_string(NULL);
1.44 markus 1278: log("channel_open_failure: %d: reason %d: %s", id, reason, msg);
1.48 markus 1279: packet_done();
1.44 markus 1280: xfree(msg);
1.48 markus 1281: xfree(lang);
1.44 markus 1282: }
1.25 markus 1283: /* Free the channel. This will also close the socket. */
1.41 markus 1284: channel_free(id);
1.1 deraadt 1285: }
1286:
1.44 markus 1287: void
1.69 markus 1288: channel_input_channel_request(int type, int plen, void *ctxt)
1.44 markus 1289: {
1290: int id;
1291: Channel *c;
1292:
1293: id = packet_get_int();
1294: c = channel_lookup(id);
1295:
1296: if (c == NULL ||
1297: (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL))
1298: packet_disconnect("Received request for "
1299: "non-open channel %d.", id);
1300: if (c->cb_fn != NULL && c->cb_event == type) {
1.70 markus 1301: debug2("callback start");
1.44 markus 1302: c->cb_fn(c->self, c->cb_arg);
1.70 markus 1303: debug2("callback done");
1.44 markus 1304: } else {
1305: char *service = packet_get_string(NULL);
1306: debug("channel: %d rcvd request for %s", c->self, service);
1.70 markus 1307: debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event);
1.44 markus 1308: xfree(service);
1309: }
1310: }
1311:
1.49 markus 1312: void
1.69 markus 1313: channel_input_window_adjust(int type, int plen, void *ctxt)
1.44 markus 1314: {
1315: Channel *c;
1316: int id, adjust;
1317:
1318: if (!compat20)
1319: return;
1320:
1321: /* Get the channel number and verify it. */
1322: id = packet_get_int();
1323: c = channel_lookup(id);
1324:
1325: if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
1326: log("Received window adjust for "
1327: "non-open channel %d.", id);
1328: return;
1329: }
1330: adjust = packet_get_int();
1.48 markus 1331: packet_done();
1.70 markus 1332: debug2("channel %d: rcvd adjust %d", id, adjust);
1.44 markus 1333: c->remote_window += adjust;
1334: }
1335:
1.27 markus 1336: /*
1337: * Stops listening for channels, and removes any unix domain sockets that we
1338: * might have.
1339: */
1.1 deraadt 1340:
1.49 markus 1341: void
1.25 markus 1342: channel_stop_listening()
1.1 deraadt 1343: {
1.25 markus 1344: int i;
1345: for (i = 0; i < channels_alloc; i++) {
1346: switch (channels[i].type) {
1347: case SSH_CHANNEL_AUTH_SOCKET:
1348: close(channels[i].sock);
1349: remove(channels[i].path);
1350: channel_free(i);
1351: break;
1352: case SSH_CHANNEL_PORT_LISTENER:
1.73 ! markus 1353: case SSH_CHANNEL_RPORT_LISTENER:
1.25 markus 1354: case SSH_CHANNEL_X11_LISTENER:
1355: close(channels[i].sock);
1356: channel_free(i);
1357: break;
1358: default:
1359: break;
1360: }
1.1 deraadt 1361: }
1362: }
1363:
1.27 markus 1364: /*
1.52 markus 1365: * Closes the sockets/fds of all channels. This is used to close extra file
1.27 markus 1366: * descriptors after a fork.
1367: */
1.1 deraadt 1368:
1.49 markus 1369: void
1.25 markus 1370: channel_close_all()
1.1 deraadt 1371: {
1.25 markus 1372: int i;
1.52 markus 1373: for (i = 0; i < channels_alloc; i++)
1.25 markus 1374: if (channels[i].type != SSH_CHANNEL_FREE)
1.52 markus 1375: channel_close_fds(&channels[i]);
1.1 deraadt 1376: }
1377:
1378: /* Returns the maximum file descriptor number used by the channels. */
1379:
1.49 markus 1380: int
1.25 markus 1381: channel_max_fd()
1.1 deraadt 1382: {
1.25 markus 1383: return channel_max_fd_value;
1.1 deraadt 1384: }
1385:
1386: /* Returns true if any channel is still open. */
1387:
1.49 markus 1388: int
1.25 markus 1389: channel_still_open()
1.1 deraadt 1390: {
1.25 markus 1391: unsigned int i;
1392: for (i = 0; i < channels_alloc; i++)
1393: switch (channels[i].type) {
1394: case SSH_CHANNEL_FREE:
1395: case SSH_CHANNEL_X11_LISTENER:
1396: case SSH_CHANNEL_PORT_LISTENER:
1.73 ! markus 1397: case SSH_CHANNEL_RPORT_LISTENER:
1.25 markus 1398: case SSH_CHANNEL_CLOSED:
1399: case SSH_CHANNEL_AUTH_SOCKET:
1400: continue;
1.44 markus 1401: case SSH_CHANNEL_LARVAL:
1402: if (!compat20)
1403: fatal("cannot happen: SSH_CHANNEL_LARVAL");
1404: continue;
1.25 markus 1405: case SSH_CHANNEL_OPENING:
1406: case SSH_CHANNEL_OPEN:
1407: case SSH_CHANNEL_X11_OPEN:
1408: return 1;
1409: case SSH_CHANNEL_INPUT_DRAINING:
1410: case SSH_CHANNEL_OUTPUT_DRAINING:
1411: if (!compat13)
1412: fatal("cannot happen: OUT_DRAIN");
1413: return 1;
1414: default:
1415: fatal("channel_still_open: bad channel type %d", channels[i].type);
1416: /* NOTREACHED */
1417: }
1418: return 0;
1.1 deraadt 1419: }
1420:
1.27 markus 1421: /*
1422: * Returns a message describing the currently open forwarded connections,
1423: * suitable for sending to the client. The message contains crlf pairs for
1424: * newlines.
1425: */
1.1 deraadt 1426:
1.25 markus 1427: char *
1428: channel_open_message()
1.1 deraadt 1429: {
1.25 markus 1430: Buffer buffer;
1431: int i;
1432: char buf[512], *cp;
1433:
1434: buffer_init(&buffer);
1435: snprintf(buf, sizeof buf, "The following connections are open:\r\n");
1.1 deraadt 1436: buffer_append(&buffer, buf, strlen(buf));
1.25 markus 1437: for (i = 0; i < channels_alloc; i++) {
1438: Channel *c = &channels[i];
1439: switch (c->type) {
1440: case SSH_CHANNEL_FREE:
1441: case SSH_CHANNEL_X11_LISTENER:
1442: case SSH_CHANNEL_PORT_LISTENER:
1.73 ! markus 1443: case SSH_CHANNEL_RPORT_LISTENER:
1.25 markus 1444: case SSH_CHANNEL_CLOSED:
1445: case SSH_CHANNEL_AUTH_SOCKET:
1446: continue;
1.44 markus 1447: case SSH_CHANNEL_LARVAL:
1.25 markus 1448: case SSH_CHANNEL_OPENING:
1449: case SSH_CHANNEL_OPEN:
1450: case SSH_CHANNEL_X11_OPEN:
1451: case SSH_CHANNEL_INPUT_DRAINING:
1452: case SSH_CHANNEL_OUTPUT_DRAINING:
1.41 markus 1453: snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n",
1.37 markus 1454: c->self, c->remote_name,
1455: c->type, c->remote_id,
1456: c->istate, buffer_len(&c->input),
1.41 markus 1457: c->ostate, buffer_len(&c->output),
1458: c->rfd, c->wfd);
1.25 markus 1459: buffer_append(&buffer, buf, strlen(buf));
1460: continue;
1461: default:
1.41 markus 1462: fatal("channel_open_message: bad channel type %d", c->type);
1.25 markus 1463: /* NOTREACHED */
1464: }
1465: }
1466: buffer_append(&buffer, "\0", 1);
1467: cp = xstrdup(buffer_ptr(&buffer));
1468: buffer_free(&buffer);
1469: return cp;
1.1 deraadt 1470: }
1471:
1.27 markus 1472: /*
1473: * Initiate forwarding of connections to local port "port" through the secure
1474: * channel to host:port from remote side.
1475: */
1.73 ! markus 1476: void
! 1477: channel_request_local_forwarding(u_short listen_port, const char *host_to_connect,
! 1478: u_short port_to_connect, int gateway_ports)
! 1479: {
! 1480: channel_request_forwarding(
! 1481: NULL, listen_port,
! 1482: host_to_connect, port_to_connect,
! 1483: gateway_ports, /*remote_fwd*/ 0);
! 1484: }
1.1 deraadt 1485:
1.73 ! markus 1486: /*
! 1487: * If 'remote_fwd' is true we have a '-R style' listener for protocol 2
! 1488: * (SSH_CHANNEL_RPORT_LISTENER).
! 1489: */
1.49 markus 1490: void
1.73 ! markus 1491: channel_request_forwarding(
! 1492: const char *listen_address, u_short listen_port,
! 1493: const char *host_to_connect, u_short port_to_connect,
! 1494: int gateway_ports, int remote_fwd)
1.25 markus 1495: {
1.73 ! markus 1496: int success, ch, sock, on = 1, ctype;
1.35 markus 1497: struct addrinfo hints, *ai, *aitop;
1498: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
1.73 ! markus 1499: const char *host;
1.28 markus 1500: struct linger linger;
1.25 markus 1501:
1.73 ! markus 1502: if (remote_fwd) {
! 1503: host = listen_address;
! 1504: ctype = SSH_CHANNEL_RPORT_LISTENER;
! 1505: } else {
! 1506: host = host_to_connect;
! 1507: ctype =SSH_CHANNEL_PORT_LISTENER;
! 1508: }
! 1509:
1.25 markus 1510: if (strlen(host) > sizeof(channels[0].path) - 1)
1511: packet_disconnect("Forward host name too long.");
1512:
1.73 ! markus 1513: /* XXX listen_address is currently ignored */
1.28 markus 1514: /*
1.35 markus 1515: * getaddrinfo returns a loopback address if the hostname is
1516: * set to NULL and hints.ai_flags is not AI_PASSIVE
1.28 markus 1517: */
1.35 markus 1518: memset(&hints, 0, sizeof(hints));
1519: hints.ai_family = IPv4or6;
1520: hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
1521: hints.ai_socktype = SOCK_STREAM;
1.73 ! markus 1522: snprintf(strport, sizeof strport, "%d", listen_port);
1.35 markus 1523: if (getaddrinfo(NULL, strport, &hints, &aitop) != 0)
1524: packet_disconnect("getaddrinfo: fatal error");
1525:
1526: success = 0;
1527: for (ai = aitop; ai; ai = ai->ai_next) {
1528: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
1529: continue;
1530: if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
1531: strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1.73 ! markus 1532: error("channel_request_forwarding: getnameinfo failed");
1.35 markus 1533: continue;
1534: }
1535: /* Create a port to listen for the host. */
1536: sock = socket(ai->ai_family, SOCK_STREAM, 0);
1537: if (sock < 0) {
1538: /* this is no error since kernel may not support ipv6 */
1539: verbose("socket: %.100s", strerror(errno));
1540: continue;
1541: }
1542: /*
1543: * Set socket options. We would like the socket to disappear
1544: * as soon as it has been closed for whatever reason.
1545: */
1546: setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
1547: linger.l_onoff = 1;
1548: linger.l_linger = 5;
1549: setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger));
1550: debug("Local forwarding listening on %s port %s.", ntop, strport);
1551:
1552: /* Bind the socket to the address. */
1553: if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1554: /* address can be in use ipv6 address is already bound */
1555: verbose("bind: %.100s", strerror(errno));
1556: close(sock);
1557: continue;
1558: }
1559: /* Start listening for connections on the socket. */
1560: if (listen(sock, 5) < 0) {
1561: error("listen: %.100s", strerror(errno));
1562: close(sock);
1563: continue;
1564: }
1565: /* Allocate a channel number for the socket. */
1.73 ! markus 1566: ch = channel_new("port listener", ctype, sock, sock, -1,
1.51 markus 1567: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1.71 markus 1568: 0, xstrdup("port listener"), 1);
1.35 markus 1569: strlcpy(channels[ch].path, host, sizeof(channels[ch].path));
1.73 ! markus 1570: channels[ch].host_port = port_to_connect;
! 1571: channels[ch].listening_port = listen_port;
1.35 markus 1572: success = 1;
1573: }
1574: if (success == 0)
1.73 ! markus 1575: packet_disconnect("cannot listen port: %d", listen_port); /*XXX ?disconnect? */
1.35 markus 1576: freeaddrinfo(aitop);
1.25 markus 1577: }
1.1 deraadt 1578:
1.27 markus 1579: /*
1580: * Initiate forwarding of connections to port "port" on remote host through
1581: * the secure channel to host:port from local side.
1582: */
1.1 deraadt 1583:
1.49 markus 1584: void
1.73 ! markus 1585: channel_request_remote_forwarding(u_short listen_port,
! 1586: const char *host_to_connect, u_short port_to_connect)
1.25 markus 1587: {
1.73 ! markus 1588: int payload_len, type, success = 0;
! 1589:
1.25 markus 1590: /* Record locally that connection to this host/port is permitted. */
1591: if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
1592: fatal("channel_request_remote_forwarding: too many forwards");
1593:
1594: /* Send the forward request to the remote side. */
1.44 markus 1595: if (compat20) {
1596: const char *address_to_bind = "0.0.0.0";
1597: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1598: packet_put_cstring("tcpip-forward");
1599: packet_put_char(0); /* boolean: want reply */
1600: packet_put_cstring(address_to_bind);
1601: packet_put_int(listen_port);
1.73 ! markus 1602: packet_send();
! 1603: packet_write_wait();
! 1604: /* Assume that server accepts the request */
! 1605: success = 1;
1.44 markus 1606: } else {
1607: packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
1.50 markus 1608: packet_put_int(listen_port);
1609: packet_put_cstring(host_to_connect);
1.44 markus 1610: packet_put_int(port_to_connect);
1611: packet_send();
1612: packet_write_wait();
1.73 ! markus 1613:
! 1614: /* Wait for response from the remote side. */
! 1615: type = packet_read(&payload_len);
! 1616: switch (type) {
! 1617: case SSH_SMSG_SUCCESS:
! 1618: success = 1;
! 1619: break;
! 1620: case SSH_SMSG_FAILURE:
! 1621: log("Warning: Server denied remote port forwarding.");
! 1622: break;
! 1623: default:
! 1624: /* Unknown packet */
! 1625: packet_disconnect("Protocol error for port forward request:"
! 1626: "received packet type %d.", type);
! 1627: }
! 1628: }
! 1629: if (success) {
! 1630: permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
! 1631: permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
! 1632: permitted_opens[num_permitted_opens].listen_port = listen_port;
! 1633: num_permitted_opens++;
1.44 markus 1634: }
1.1 deraadt 1635: }
1636:
1.27 markus 1637: /*
1638: * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
1639: * listening for the port, and sends back a success reply (or disconnect
1640: * message if there was an error). This never returns if there was an error.
1641: */
1.1 deraadt 1642:
1.49 markus 1643: void
1.56 markus 1644: channel_input_port_forward_request(int is_root, int gateway_ports)
1.1 deraadt 1645: {
1.31 markus 1646: u_short port, host_port;
1.25 markus 1647: char *hostname;
1.1 deraadt 1648:
1.25 markus 1649: /* Get arguments from the packet. */
1650: port = packet_get_int();
1651: hostname = packet_get_string(NULL);
1652: host_port = packet_get_int();
1653:
1.27 markus 1654: /*
1655: * Check that an unprivileged user is not trying to forward a
1656: * privileged port.
1657: */
1.25 markus 1658: if (port < IPPORT_RESERVED && !is_root)
1659: packet_disconnect("Requested forwarding of port %d but user is not root.",
1660: port);
1.73 ! markus 1661: /* Initiate forwarding */
1.56 markus 1662: channel_request_local_forwarding(port, hostname, host_port, gateway_ports);
1.25 markus 1663:
1664: /* Free the argument string. */
1665: xfree(hostname);
1.1 deraadt 1666: }
1667:
1.41 markus 1668: /* XXX move to aux.c */
1669: int
1670: channel_connect_to(const char *host, u_short host_port)
1671: {
1672: struct addrinfo hints, *ai, *aitop;
1673: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
1674: int gaierr;
1675: int sock = -1;
1676:
1677: memset(&hints, 0, sizeof(hints));
1678: hints.ai_family = IPv4or6;
1679: hints.ai_socktype = SOCK_STREAM;
1680: snprintf(strport, sizeof strport, "%d", host_port);
1681: if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
1682: error("%.100s: unknown host (%s)", host, gai_strerror(gaierr));
1683: return -1;
1684: }
1685: for (ai = aitop; ai; ai = ai->ai_next) {
1686: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
1687: continue;
1688: if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
1689: strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1690: error("channel_connect_to: getnameinfo failed");
1691: continue;
1692: }
1693: /* Create the socket. */
1694: sock = socket(ai->ai_family, SOCK_STREAM, 0);
1695: if (sock < 0) {
1696: error("socket: %.100s", strerror(errno));
1697: continue;
1698: }
1699: /* Connect to the host/port. */
1700: if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1701: error("connect %.100s port %s: %.100s", ntop, strport,
1702: strerror(errno));
1703: close(sock);
1704: continue; /* fail -- try next */
1705: }
1706: break; /* success */
1707:
1708: }
1709: freeaddrinfo(aitop);
1710: if (!ai) {
1711: error("connect %.100s port %d: failed.", host, host_port);
1712: return -1;
1713: }
1714: /* success */
1715: return sock;
1716: }
1.73 ! markus 1717: int
! 1718: channel_connect_by_listen_adress(u_short listen_port)
! 1719: {
! 1720: int i;
! 1721: for (i = 0; i < num_permitted_opens; i++)
! 1722: if (permitted_opens[i].listen_port == listen_port)
! 1723: return channel_connect_to(
! 1724: permitted_opens[i].host_to_connect,
! 1725: permitted_opens[i].port_to_connect);
! 1726: debug("channel_connect_by_listen_adress: unknown listen_port %d", listen_port);
! 1727: return -1;
! 1728: }
! 1729:
1.27 markus 1730: /*
1731: * This is called after receiving PORT_OPEN message. This attempts to
1732: * connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION
1733: * or CHANNEL_OPEN_FAILURE.
1734: */
1.1 deraadt 1735:
1.49 markus 1736: void
1.69 markus 1737: channel_input_port_open(int type, int plen, void *ctxt)
1.1 deraadt 1738: {
1.31 markus 1739: u_short host_port;
1.25 markus 1740: char *host, *originator_string;
1.41 markus 1741: int remote_channel, sock = -1, newch, i, denied;
1.39 markus 1742: unsigned int host_len, originator_len;
1.25 markus 1743:
1744: /* Get remote channel number. */
1745: remote_channel = packet_get_int();
1746:
1747: /* Get host name to connect to. */
1748: host = packet_get_string(&host_len);
1749:
1750: /* Get port to connect to. */
1751: host_port = packet_get_int();
1752:
1753: /* Get remote originator name. */
1.29 markus 1754: if (have_hostname_in_open) {
1.25 markus 1755: originator_string = packet_get_string(&originator_len);
1.29 markus 1756: originator_len += 4; /* size of packet_int */
1757: } else {
1.25 markus 1758: originator_string = xstrdup("unknown (remote did not supply name)");
1.29 markus 1759: originator_len = 0; /* no originator supplied */
1760: }
1.25 markus 1761:
1.41 markus 1762: packet_integrity_check(plen,
1763: 4 + 4 + host_len + 4 + originator_len, SSH_MSG_PORT_OPEN);
1.25 markus 1764:
1765: /* Check if opening that port is permitted. */
1.41 markus 1766: denied = 0;
1.25 markus 1767: if (!all_opens_permitted) {
1768: /* Go trough all permitted ports. */
1769: for (i = 0; i < num_permitted_opens; i++)
1.41 markus 1770: if (permitted_opens[i].port_to_connect == host_port &&
1771: strcmp(permitted_opens[i].host_to_connect, host) == 0)
1.25 markus 1772: break;
1773:
1774: /* Check if we found the requested port among those permitted. */
1775: if (i >= num_permitted_opens) {
1776: /* The port is not permitted. */
1777: log("Received request to connect to %.100s:%d, but the request was denied.",
1778: host, host_port);
1.41 markus 1779: denied = 1;
1.25 markus 1780: }
1781: }
1.41 markus 1782: sock = denied ? -1 : channel_connect_to(host, host_port);
1783: if (sock > 0) {
1784: /* Allocate a channel for this connection. */
1785: newch = channel_allocate(SSH_CHANNEL_OPEN, sock, originator_string);
1786: channels[newch].remote_id = remote_channel;
1787:
1788: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1789: packet_put_int(remote_channel);
1790: packet_put_int(newch);
1791: packet_send();
1792: } else {
1793: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1794: packet_put_int(remote_channel);
1795: packet_send();
1.25 markus 1796: }
1797: xfree(host);
1.1 deraadt 1798: }
1799:
1.27 markus 1800: /*
1801: * Creates an internet domain socket for listening for X11 connections.
1802: * Returns a suitable value for the DISPLAY variable, or NULL if an error
1803: * occurs.
1804: */
1.1 deraadt 1805:
1.35 markus 1806: #define NUM_SOCKS 10
1807:
1.25 markus 1808: char *
1.33 markus 1809: x11_create_display_inet(int screen_number, int x11_display_offset)
1.1 deraadt 1810: {
1.31 markus 1811: int display_number, sock;
1812: u_short port;
1.35 markus 1813: struct addrinfo hints, *ai, *aitop;
1814: char strport[NI_MAXSERV];
1815: int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
1816: char display[512];
1.25 markus 1817: char hostname[MAXHOSTNAMELEN];
1818:
1.33 markus 1819: for (display_number = x11_display_offset;
1.25 markus 1820: display_number < MAX_DISPLAYS;
1821: display_number++) {
1822: port = 6000 + display_number;
1.35 markus 1823: memset(&hints, 0, sizeof(hints));
1824: hints.ai_family = IPv4or6;
1.36 markus 1825: hints.ai_flags = AI_PASSIVE; /* XXX loopback only ? */
1.35 markus 1826: hints.ai_socktype = SOCK_STREAM;
1827: snprintf(strport, sizeof strport, "%d", port);
1828: if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
1829: error("getaddrinfo: %.100s", gai_strerror(gaierr));
1.25 markus 1830: return NULL;
1831: }
1.35 markus 1832: for (ai = aitop; ai; ai = ai->ai_next) {
1833: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
1834: continue;
1835: sock = socket(ai->ai_family, SOCK_STREAM, 0);
1836: if (sock < 0) {
1837: error("socket: %.100s", strerror(errno));
1838: return NULL;
1839: }
1840: if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1841: debug("bind port %d: %.100s", port, strerror(errno));
1842: shutdown(sock, SHUT_RDWR);
1843: close(sock);
1844: for (n = 0; n < num_socks; n++) {
1845: shutdown(socks[n], SHUT_RDWR);
1846: close(socks[n]);
1847: }
1848: num_socks = 0;
1849: break;
1850: }
1851: socks[num_socks++] = sock;
1852: if (num_socks == NUM_SOCKS)
1853: break;
1.25 markus 1854: }
1.35 markus 1855: if (num_socks > 0)
1856: break;
1.25 markus 1857: }
1858: if (display_number >= MAX_DISPLAYS) {
1859: error("Failed to allocate internet-domain X11 display socket.");
1860: return NULL;
1861: }
1862: /* Start listening for connections on the socket. */
1.35 markus 1863: for (n = 0; n < num_socks; n++) {
1864: sock = socks[n];
1865: if (listen(sock, 5) < 0) {
1866: error("listen: %.100s", strerror(errno));
1867: shutdown(sock, SHUT_RDWR);
1868: close(sock);
1869: return NULL;
1870: }
1.25 markus 1871: }
1.35 markus 1872:
1.25 markus 1873: /* Set up a suitable value for the DISPLAY variable. */
1874: if (gethostname(hostname, sizeof(hostname)) < 0)
1875: fatal("gethostname: %.100s", strerror(errno));
1.35 markus 1876: snprintf(display, sizeof display, "%.400s:%d.%d", hostname,
1.25 markus 1877: display_number, screen_number);
1878:
1.35 markus 1879: /* Allocate a channel for each socket. */
1880: for (n = 0; n < num_socks; n++) {
1881: sock = socks[n];
1.51 markus 1882: (void) channel_new("x11 listener",
1883: SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
1884: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.71 markus 1885: 0, xstrdup("X11 inet listener"), 1);
1.35 markus 1886: }
1.1 deraadt 1887:
1.25 markus 1888: /* Return a suitable value for the DISPLAY environment variable. */
1.35 markus 1889: return xstrdup(display);
1.1 deraadt 1890: }
1891:
1892: #ifndef X_UNIX_PATH
1893: #define X_UNIX_PATH "/tmp/.X11-unix/X"
1894: #endif
1895:
1896: static
1897: int
1.30 deraadt 1898: connect_local_xsocket(unsigned int dnr)
1.1 deraadt 1899: {
1.25 markus 1900: static const char *const x_sockets[] = {
1901: X_UNIX_PATH "%u",
1902: "/var/X/.X11-unix/X" "%u",
1903: "/usr/spool/sockets/X11/" "%u",
1904: NULL
1905: };
1906: int sock;
1907: struct sockaddr_un addr;
1908: const char *const * path;
1909:
1910: for (path = x_sockets; *path; ++path) {
1911: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1912: if (sock < 0)
1913: error("socket: %.100s", strerror(errno));
1914: memset(&addr, 0, sizeof(addr));
1915: addr.sun_family = AF_UNIX;
1916: snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr);
1917: if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
1918: return sock;
1919: close(sock);
1920: }
1921: error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
1922: return -1;
1.1 deraadt 1923: }
1924:
1.51 markus 1925: int
1926: x11_connect_display(void)
1.1 deraadt 1927: {
1.51 markus 1928: int display_number, sock = 0;
1.25 markus 1929: const char *display;
1.51 markus 1930: char buf[1024], *cp;
1.35 markus 1931: struct addrinfo hints, *ai, *aitop;
1932: char strport[NI_MAXSERV];
1933: int gaierr;
1.25 markus 1934:
1935: /* Try to open a socket for the local X server. */
1936: display = getenv("DISPLAY");
1937: if (!display) {
1938: error("DISPLAY not set.");
1.51 markus 1939: return -1;
1.25 markus 1940: }
1.27 markus 1941: /*
1942: * Now we decode the value of the DISPLAY variable and make a
1943: * connection to the real X server.
1944: */
1945:
1946: /*
1947: * Check if it is a unix domain socket. Unix domain displays are in
1948: * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
1949: */
1.25 markus 1950: if (strncmp(display, "unix:", 5) == 0 ||
1951: display[0] == ':') {
1952: /* Connect to the unix domain socket. */
1953: if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
1954: error("Could not parse display number from DISPLAY: %.100s",
1955: display);
1.51 markus 1956: return -1;
1.25 markus 1957: }
1958: /* Create a socket. */
1959: sock = connect_local_xsocket(display_number);
1960: if (sock < 0)
1.51 markus 1961: return -1;
1.25 markus 1962:
1963: /* OK, we now have a connection to the display. */
1.51 markus 1964: return sock;
1.25 markus 1965: }
1.27 markus 1966: /*
1967: * Connect to an inet socket. The DISPLAY value is supposedly
1968: * hostname:d[.s], where hostname may also be numeric IP address.
1969: */
1.25 markus 1970: strncpy(buf, display, sizeof(buf));
1971: buf[sizeof(buf) - 1] = 0;
1972: cp = strchr(buf, ':');
1973: if (!cp) {
1974: error("Could not find ':' in DISPLAY: %.100s", display);
1.51 markus 1975: return -1;
1.25 markus 1976: }
1977: *cp = 0;
1.27 markus 1978: /* buf now contains the host name. But first we parse the display number. */
1.25 markus 1979: if (sscanf(cp + 1, "%d", &display_number) != 1) {
1980: error("Could not parse display number from DISPLAY: %.100s",
1981: display);
1.51 markus 1982: return -1;
1.25 markus 1983: }
1.35 markus 1984:
1985: /* Look up the host address */
1986: memset(&hints, 0, sizeof(hints));
1987: hints.ai_family = IPv4or6;
1988: hints.ai_socktype = SOCK_STREAM;
1989: snprintf(strport, sizeof strport, "%d", 6000 + display_number);
1990: if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
1991: error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
1.51 markus 1992: return -1;
1.25 markus 1993: }
1.35 markus 1994: for (ai = aitop; ai; ai = ai->ai_next) {
1995: /* Create a socket. */
1996: sock = socket(ai->ai_family, SOCK_STREAM, 0);
1997: if (sock < 0) {
1998: debug("socket: %.100s", strerror(errno));
1.41 markus 1999: continue;
2000: }
2001: /* Connect it to the display. */
2002: if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2003: debug("connect %.100s port %d: %.100s", buf,
2004: 6000 + display_number, strerror(errno));
2005: close(sock);
2006: continue;
2007: }
2008: /* Success */
2009: break;
1.35 markus 2010: }
2011: freeaddrinfo(aitop);
2012: if (!ai) {
1.49 markus 2013: error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
1.35 markus 2014: strerror(errno));
1.51 markus 2015: return -1;
1.25 markus 2016: }
1.51 markus 2017: return sock;
2018: }
2019:
2020: /*
2021: * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
2022: * the remote channel number. We should do whatever we want, and respond
2023: * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2024: */
2025:
2026: void
1.69 markus 2027: x11_input_open(int type, int plen, void *ctxt)
1.51 markus 2028: {
2029: int remote_channel, sock = 0, newch;
2030: char *remote_host;
2031: unsigned int remote_len;
1.25 markus 2032:
1.51 markus 2033: /* Get remote channel number. */
2034: remote_channel = packet_get_int();
2035:
2036: /* Get remote originator name. */
2037: if (have_hostname_in_open) {
2038: remote_host = packet_get_string(&remote_len);
2039: remote_len += 4;
2040: } else {
2041: remote_host = xstrdup("unknown (remote did not supply name)");
2042: remote_len = 0;
2043: }
1.25 markus 2044:
1.51 markus 2045: debug("Received X11 open request.");
2046: packet_integrity_check(plen, 4 + remote_len, SSH_SMSG_X11_OPEN);
1.25 markus 2047:
1.51 markus 2048: /* Obtain a connection to the real X display. */
2049: sock = x11_connect_display();
2050: if (sock == -1) {
2051: /* Send refusal to the remote host. */
2052: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2053: packet_put_int(remote_channel);
2054: packet_send();
2055: } else {
2056: /* Allocate a channel for this connection. */
2057: newch = channel_allocate(
2058: (x11_saved_proto == NULL) ?
2059: SSH_CHANNEL_OPEN : SSH_CHANNEL_X11_OPEN,
2060: sock, remote_host);
2061: channels[newch].remote_id = remote_channel;
1.25 markus 2062:
1.51 markus 2063: /* Send a confirmation to the remote host. */
2064: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
2065: packet_put_int(remote_channel);
2066: packet_put_int(newch);
2067: packet_send();
2068: }
1.72 markus 2069: }
2070:
2071: /* dummy protocol handler that denies SSH-1 requests (agent/x11) */
2072: void
2073: deny_input_open(int type, int plen, void *ctxt)
2074: {
2075: int rchan = packet_get_int();
2076: switch(type){
2077: case SSH_SMSG_AGENT_OPEN:
2078: error("Warning: ssh server tried agent forwarding.");
2079: break;
2080: case SSH_SMSG_X11_OPEN:
2081: error("Warning: ssh server tried X11 forwarding.");
2082: break;
2083: default:
2084: error("deny_input_open: type %d plen %d", type, plen);
2085: break;
2086: }
2087: error("Warning: this is probably a break in attempt by a malicious server.");
2088: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2089: packet_put_int(rchan);
2090: packet_send();
1.1 deraadt 2091: }
2092:
1.27 markus 2093: /*
2094: * Requests forwarding of X11 connections, generates fake authentication
2095: * data, and enables authentication spoofing.
2096: */
1.1 deraadt 2097:
1.49 markus 2098: void
1.51 markus 2099: x11_request_forwarding_with_spoofing(int client_session_id,
2100: const char *proto, const char *data)
1.1 deraadt 2101: {
1.25 markus 2102: unsigned int data_len = (unsigned int) strlen(data) / 2;
2103: unsigned int i, value;
2104: char *new_data;
2105: int screen_number;
2106: const char *cp;
2107: u_int32_t rand = 0;
2108:
2109: cp = getenv("DISPLAY");
2110: if (cp)
2111: cp = strchr(cp, ':');
2112: if (cp)
2113: cp = strchr(cp, '.');
2114: if (cp)
2115: screen_number = atoi(cp + 1);
2116: else
2117: screen_number = 0;
2118:
2119: /* Save protocol name. */
2120: x11_saved_proto = xstrdup(proto);
2121:
1.27 markus 2122: /*
2123: * Extract real authentication data and generate fake data of the
2124: * same length.
2125: */
1.25 markus 2126: x11_saved_data = xmalloc(data_len);
2127: x11_fake_data = xmalloc(data_len);
2128: for (i = 0; i < data_len; i++) {
2129: if (sscanf(data + 2 * i, "%2x", &value) != 1)
2130: fatal("x11_request_forwarding: bad authentication data: %.100s", data);
2131: if (i % 4 == 0)
2132: rand = arc4random();
2133: x11_saved_data[i] = value;
2134: x11_fake_data[i] = rand & 0xff;
2135: rand >>= 8;
2136: }
2137: x11_saved_data_len = data_len;
2138: x11_fake_data_len = data_len;
2139:
2140: /* Convert the fake data into hex. */
2141: new_data = xmalloc(2 * data_len + 1);
2142: for (i = 0; i < data_len; i++)
2143: sprintf(new_data + 2 * i, "%02x", (unsigned char) x11_fake_data[i]);
2144:
2145: /* Send the request packet. */
1.51 markus 2146: if (compat20) {
2147: channel_request_start(client_session_id, "x11-req", 0);
2148: packet_put_char(0); /* XXX bool single connection */
2149: } else {
2150: packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
2151: }
2152: packet_put_cstring(proto);
2153: packet_put_cstring(new_data);
1.25 markus 2154: packet_put_int(screen_number);
2155: packet_send();
2156: packet_write_wait();
2157: xfree(new_data);
1.1 deraadt 2158: }
2159:
2160: /* Sends a message to the server to request authentication fd forwarding. */
2161:
1.49 markus 2162: void
1.25 markus 2163: auth_request_forwarding()
1.1 deraadt 2164: {
1.25 markus 2165: packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
2166: packet_send();
2167: packet_write_wait();
1.1 deraadt 2168: }
2169:
1.27 markus 2170: /*
2171: * Returns the name of the forwarded authentication socket. Returns NULL if
2172: * there is no forwarded authentication socket. The returned value points to
2173: * a static buffer.
2174: */
1.1 deraadt 2175:
1.25 markus 2176: char *
2177: auth_get_socket_name()
1.1 deraadt 2178: {
1.25 markus 2179: return channel_forwarded_auth_socket_name;
1.1 deraadt 2180: }
2181:
1.12 markus 2182: /* removes the agent forwarding socket */
2183:
1.49 markus 2184: void
1.25 markus 2185: cleanup_socket(void)
2186: {
2187: remove(channel_forwarded_auth_socket_name);
2188: rmdir(channel_forwarded_auth_socket_dir);
1.12 markus 2189: }
2190:
1.27 markus 2191: /*
1.59 markus 2192: * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
1.27 markus 2193: * This starts forwarding authentication requests.
2194: */
1.1 deraadt 2195:
1.59 markus 2196: int
1.25 markus 2197: auth_input_request_forwarding(struct passwd * pw)
1.1 deraadt 2198: {
1.25 markus 2199: int sock, newch;
2200: struct sockaddr_un sunaddr;
2201:
2202: if (auth_get_socket_name() != NULL)
2203: fatal("Protocol error: authentication forwarding requested twice.");
2204:
2205: /* Temporarily drop privileged uid for mkdir/bind. */
2206: temporarily_use_uid(pw->pw_uid);
2207:
2208: /* Allocate a buffer for the socket name, and format the name. */
2209: channel_forwarded_auth_socket_name = xmalloc(MAX_SOCKET_NAME);
2210: channel_forwarded_auth_socket_dir = xmalloc(MAX_SOCKET_NAME);
2211: strlcpy(channel_forwarded_auth_socket_dir, "/tmp/ssh-XXXXXXXX", MAX_SOCKET_NAME);
2212:
2213: /* Create private directory for socket */
1.59 markus 2214: if (mkdtemp(channel_forwarded_auth_socket_dir) == NULL) {
2215: packet_send_debug("Agent forwarding disabled: mkdtemp() failed: %.100s",
2216: strerror(errno));
2217: restore_uid();
2218: xfree(channel_forwarded_auth_socket_name);
2219: xfree(channel_forwarded_auth_socket_dir);
2220: channel_forwarded_auth_socket_name = NULL;
2221: channel_forwarded_auth_socket_dir = NULL;
2222: return 0;
2223: }
1.25 markus 2224: snprintf(channel_forwarded_auth_socket_name, MAX_SOCKET_NAME, "%s/agent.%d",
2225: channel_forwarded_auth_socket_dir, (int) getpid());
2226:
2227: if (atexit(cleanup_socket) < 0) {
2228: int saved = errno;
2229: cleanup_socket();
2230: packet_disconnect("socket: %.100s", strerror(saved));
2231: }
2232: /* Create the socket. */
2233: sock = socket(AF_UNIX, SOCK_STREAM, 0);
2234: if (sock < 0)
2235: packet_disconnect("socket: %.100s", strerror(errno));
2236:
2237: /* Bind it to the name. */
2238: memset(&sunaddr, 0, sizeof(sunaddr));
2239: sunaddr.sun_family = AF_UNIX;
2240: strncpy(sunaddr.sun_path, channel_forwarded_auth_socket_name,
2241: sizeof(sunaddr.sun_path));
2242:
2243: if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
2244: packet_disconnect("bind: %.100s", strerror(errno));
2245:
2246: /* Restore the privileged uid. */
2247: restore_uid();
2248:
2249: /* Start listening on the socket. */
2250: if (listen(sock, 5) < 0)
2251: packet_disconnect("listen: %.100s", strerror(errno));
2252:
2253: /* Allocate a channel for the authentication agent socket. */
1.73 ! markus 2254: newch = channel_new("auth socket",
! 2255: SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
! 2256: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
! 2257: 0, xstrdup("auth socket"), 1);
! 2258:
1.32 deraadt 2259: strlcpy(channels[newch].path, channel_forwarded_auth_socket_name,
2260: sizeof(channels[newch].path));
1.59 markus 2261: return 1;
1.1 deraadt 2262: }
2263:
2264: /* This is called to process an SSH_SMSG_AGENT_OPEN message. */
2265:
1.49 markus 2266: void
1.69 markus 2267: auth_input_open_request(int type, int plen, void *ctxt)
1.1 deraadt 2268: {
1.25 markus 2269: int remch, sock, newch;
2270: char *dummyname;
1.41 markus 2271:
2272: packet_integrity_check(plen, 4, type);
1.25 markus 2273:
2274: /* Read the remote channel number from the message. */
2275: remch = packet_get_int();
2276:
1.27 markus 2277: /*
2278: * Get a connection to the local authentication agent (this may again
2279: * get forwarded).
2280: */
1.25 markus 2281: sock = ssh_get_authentication_socket();
2282:
1.27 markus 2283: /*
2284: * If we could not connect the agent, send an error message back to
2285: * the server. This should never happen unless the agent dies,
2286: * because authentication forwarding is only enabled if we have an
2287: * agent.
2288: */
1.25 markus 2289: if (sock < 0) {
2290: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2291: packet_put_int(remch);
2292: packet_send();
2293: return;
2294: }
2295: debug("Forwarding authentication connection.");
1.1 deraadt 2296:
1.27 markus 2297: /*
2298: * Dummy host name. This will be freed when the channel is freed; it
2299: * will still be valid in the packet_put_string below since the
2300: * channel cannot yet be freed at that point.
2301: */
1.25 markus 2302: dummyname = xstrdup("authentication agent connection");
2303:
2304: newch = channel_allocate(SSH_CHANNEL_OPEN, sock, dummyname);
2305: channels[newch].remote_id = remch;
2306:
2307: /* Send a confirmation to the remote host. */
2308: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
2309: packet_put_int(remch);
2310: packet_put_int(newch);
1.44 markus 2311: packet_send();
2312: }
2313:
2314: void
1.51 markus 2315: channel_start_open(int id)
1.44 markus 2316: {
2317: Channel *c = channel_lookup(id);
2318: if (c == NULL) {
2319: log("channel_open: %d: bad id", id);
2320: return;
2321: }
1.51 markus 2322: debug("send channel open %d", id);
1.44 markus 2323: packet_start(SSH2_MSG_CHANNEL_OPEN);
2324: packet_put_cstring(c->ctype);
2325: packet_put_int(c->self);
2326: packet_put_int(c->local_window);
2327: packet_put_int(c->local_maxpacket);
1.51 markus 2328: }
2329: void
2330: channel_open(int id)
2331: {
2332: /* XXX REMOVE ME */
2333: channel_start_open(id);
1.44 markus 2334: packet_send();
2335: }
2336: void
2337: channel_request(int id, char *service, int wantconfirm)
2338: {
2339: channel_request_start(id, service, wantconfirm);
2340: packet_send();
2341: debug("channel request %d: %s", id, service) ;
2342: }
2343: void
2344: channel_request_start(int id, char *service, int wantconfirm)
2345: {
2346: Channel *c = channel_lookup(id);
2347: if (c == NULL) {
2348: log("channel_request: %d: bad id", id);
2349: return;
2350: }
2351: packet_start(SSH2_MSG_CHANNEL_REQUEST);
2352: packet_put_int(c->remote_id);
2353: packet_put_cstring(service);
2354: packet_put_char(wantconfirm);
2355: }
2356: void
2357: channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg)
2358: {
2359: Channel *c = channel_lookup(id);
2360: if (c == NULL) {
2361: log("channel_register_callback: %d: bad id", id);
2362: return;
2363: }
2364: c->cb_event = mtype;
2365: c->cb_fn = fn;
2366: c->cb_arg = arg;
2367: }
2368: void
2369: channel_register_cleanup(int id, channel_callback_fn *fn)
2370: {
2371: Channel *c = channel_lookup(id);
2372: if (c == NULL) {
2373: log("channel_register_cleanup: %d: bad id", id);
2374: return;
2375: }
2376: c->dettach_user = fn;
2377: }
2378: void
2379: channel_cancel_cleanup(int id)
2380: {
2381: Channel *c = channel_lookup(id);
2382: if (c == NULL) {
2383: log("channel_cancel_cleanup: %d: bad id", id);
2384: return;
2385: }
2386: c->dettach_user = NULL;
1.65 markus 2387: }
2388: void
2389: channel_register_filter(int id, channel_filter_fn *fn)
2390: {
2391: Channel *c = channel_lookup(id);
2392: if (c == NULL) {
2393: log("channel_register_filter: %d: bad id", id);
2394: return;
2395: }
2396: c->input_filter = fn;
1.44 markus 2397: }
2398:
2399: void
1.71 markus 2400: channel_set_fds(int id, int rfd, int wfd, int efd,
2401: int extusage, int nonblock)
1.44 markus 2402: {
2403: Channel *c = channel_lookup(id);
2404: if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
2405: fatal("channel_activate for non-larval channel %d.", id);
1.71 markus 2406: channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
1.44 markus 2407: c->type = SSH_CHANNEL_OPEN;
2408: /* XXX window size? */
1.68 markus 2409: c->local_window = c->local_window_max = c->local_maxpacket * 2;
1.44 markus 2410: packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
2411: packet_put_int(c->remote_id);
2412: packet_put_int(c->local_window);
1.25 markus 2413: packet_send();
1.1 deraadt 2414: }
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