Annotation of src/usr.bin/ssh/channels.c, Revision 1.278
1.278 ! dtucker 1: /* $OpenBSD: channels.c,v 1.277 2008/05/09 16:17:51 markus Exp $ */
1.1 deraadt 2: /*
1.26 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * This file contains functions for generic socket connection forwarding.
7: * There is also code for initiating connection forwarding for X11 connections,
8: * arbitrary tcp/ip connections, and the authentication agent connection.
1.49 markus 9: *
1.67 deraadt 10: * As far as I am concerned, the code I have written for this software
11: * can be used freely for any purpose. Any derived versions of this
12: * software must be clearly marked as such, and if the derived work is
13: * incompatible with the protocol description in the RFC file, it must be
14: * called by a name other than "ssh" or "Secure Shell".
15: *
1.44 markus 16: * SSH2 support added by Markus Friedl.
1.156 markus 17: * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
1.67 deraadt 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:
1.265 deraadt 42: #include <sys/types.h>
1.234 stevesk 43: #include <sys/ioctl.h>
1.235 stevesk 44: #include <sys/un.h>
1.251 stevesk 45: #include <sys/socket.h>
1.261 stevesk 46: #include <sys/time.h>
1.275 djm 47: #include <sys/queue.h>
1.251 stevesk 48:
49: #include <netinet/in.h>
50: #include <arpa/inet.h>
1.233 stevesk 51:
1.254 stevesk 52: #include <errno.h>
1.255 stevesk 53: #include <netdb.h>
1.263 stevesk 54: #include <stdio.h>
1.262 stevesk 55: #include <stdlib.h>
1.260 stevesk 56: #include <string.h>
1.233 stevesk 57: #include <termios.h>
1.256 stevesk 58: #include <unistd.h>
1.265 deraadt 59: #include <stdarg.h>
1.1 deraadt 60:
1.265 deraadt 61: #include "xmalloc.h"
1.1 deraadt 62: #include "ssh.h"
1.82 markus 63: #include "ssh1.h"
64: #include "ssh2.h"
1.1 deraadt 65: #include "packet.h"
1.82 markus 66: #include "log.h"
67: #include "misc.h"
1.265 deraadt 68: #include "buffer.h"
1.14 markus 69: #include "channels.h"
70: #include "compat.h"
1.82 markus 71: #include "canohost.h"
1.64 markus 72: #include "key.h"
73: #include "authfd.h"
1.147 stevesk 74: #include "pathnames.h"
1.1 deraadt 75:
1.121 markus 76: /* -- channel core */
1.12 markus 77:
1.27 markus 78: /*
79: * Pointer to an array containing all allocated channels. The array is
80: * dynamically extended as needed.
81: */
1.113 markus 82: static Channel **channels = NULL;
1.1 deraadt 83:
1.27 markus 84: /*
85: * Size of the channel array. All slots of the array must always be
1.113 markus 86: * initialized (at least the type field); unused slots set to NULL
1.27 markus 87: */
1.209 avsm 88: static u_int channels_alloc = 0;
1.1 deraadt 89:
1.27 markus 90: /*
91: * Maximum file descriptor value used in any of the channels. This is
1.113 markus 92: * updated in channel_new.
1.27 markus 93: */
1.84 markus 94: static int channel_max_fd = 0;
1.1 deraadt 95:
96:
1.121 markus 97: /* -- tcp forwarding */
1.1 deraadt 98:
1.27 markus 99: /*
100: * Data structure for storing which hosts are permitted for forward requests.
101: * The local sides of any remote forwards are stored in this array to prevent
102: * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
103: * network (which might be behind a firewall).
104: */
1.25 markus 105: typedef struct {
1.41 markus 106: char *host_to_connect; /* Connect to 'host'. */
107: u_short port_to_connect; /* Connect to 'port'. */
108: u_short listen_port; /* Remote side should listen port number. */
1.1 deraadt 109: } ForwardPermission;
110:
1.257 dtucker 111: /* List of all permitted host/port pairs to connect by the user. */
1.1 deraadt 112: static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
1.121 markus 113:
1.257 dtucker 114: /* List of all permitted host/port pairs to connect by the admin. */
115: static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
116:
117: /* Number of permitted host/port pairs in the array permitted by the user. */
1.1 deraadt 118: static int num_permitted_opens = 0;
1.257 dtucker 119:
120: /* Number of permitted host/port pair in the array permitted by the admin. */
121: static int num_adm_permitted_opens = 0;
122:
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:
1.121 markus 130:
131: /* -- X11 forwarding */
132:
133: /* Maximum number of fake X11 displays to try. */
134: #define MAX_DISPLAYS 1000
135:
1.219 djm 136: /* Saved X11 local (client) display. */
137: static char *x11_saved_display = NULL;
138:
1.121 markus 139: /* Saved X11 authentication protocol name. */
140: static char *x11_saved_proto = NULL;
141:
142: /* Saved X11 authentication data. This is the real data. */
143: static char *x11_saved_data = NULL;
144: static u_int x11_saved_data_len = 0;
145:
146: /*
147: * Fake X11 authentication data. This is what the server will be sending us;
148: * we should replace any occurrences of this by the real data.
149: */
1.240 deraadt 150: static u_char *x11_fake_data = NULL;
1.121 markus 151: static u_int x11_fake_data_len;
152:
153:
154: /* -- agent forwarding */
155:
156: #define NUM_SOCKS 10
157:
1.82 markus 158: /* AF_UNSPEC or AF_INET or AF_INET6 */
1.135 markus 159: static int IPv4or6 = AF_UNSPEC;
1.1 deraadt 160:
1.121 markus 161: /* helper */
1.127 itojun 162: static void port_open_helper(Channel *c, char *rtype);
1.103 markus 163:
1.276 djm 164: /* non-blocking connect helpers */
165: static int connect_next(struct channel_connect *);
166: static void channel_connect_ctx_free(struct channel_connect *);
167:
1.121 markus 168: /* -- channel core */
1.41 markus 169:
170: Channel *
1.229 markus 171: channel_by_id(int id)
1.41 markus 172: {
173: Channel *c;
1.113 markus 174:
1.209 avsm 175: if (id < 0 || (u_int)id >= channels_alloc) {
1.229 markus 176: logit("channel_by_id: %d: bad id", id);
1.41 markus 177: return NULL;
178: }
1.113 markus 179: c = channels[id];
180: if (c == NULL) {
1.229 markus 181: logit("channel_by_id: %d: bad id: channel free", id);
1.41 markus 182: return NULL;
183: }
184: return c;
1.55 markus 185: }
186:
1.27 markus 187: /*
1.229 markus 188: * Returns the channel if it is allowed to receive protocol messages.
189: * Private channels, like listening sockets, may not receive messages.
190: */
191: Channel *
192: channel_lookup(int id)
193: {
194: Channel *c;
195:
196: if ((c = channel_by_id(id)) == NULL)
197: return (NULL);
198:
1.237 deraadt 199: switch (c->type) {
1.229 markus 200: case SSH_CHANNEL_X11_OPEN:
201: case SSH_CHANNEL_LARVAL:
202: case SSH_CHANNEL_CONNECTING:
203: case SSH_CHANNEL_DYNAMIC:
204: case SSH_CHANNEL_OPENING:
205: case SSH_CHANNEL_OPEN:
206: case SSH_CHANNEL_INPUT_DRAINING:
207: case SSH_CHANNEL_OUTPUT_DRAINING:
208: return (c);
209: }
210: logit("Non-public channel %d, type %d.", id, c->type);
211: return (NULL);
212: }
213:
214: /*
1.55 markus 215: * Register filedescriptors for a channel, used when allocating a channel or
1.52 markus 216: * when the channel consumer/producer is ready, e.g. shell exec'd
1.27 markus 217: */
1.127 itojun 218: static void
1.71 markus 219: channel_register_fds(Channel *c, int rfd, int wfd, int efd,
220: int extusage, int nonblock)
1.1 deraadt 221: {
1.25 markus 222: /* Update the maximum file descriptor value. */
1.84 markus 223: channel_max_fd = MAX(channel_max_fd, rfd);
224: channel_max_fd = MAX(channel_max_fd, wfd);
225: channel_max_fd = MAX(channel_max_fd, efd);
226:
1.27 markus 227: /* XXX set close-on-exec -markus */
1.55 markus 228:
1.52 markus 229: c->rfd = rfd;
230: c->wfd = wfd;
231: c->sock = (rfd == wfd) ? rfd : -1;
1.204 djm 232: c->ctl_fd = -1; /* XXX: set elsewhere */
1.52 markus 233: c->efd = efd;
234: c->extended_usage = extusage;
1.71 markus 235:
1.91 markus 236: /* XXX ugly hack: nonblock is only set by the server */
237: if (nonblock && isatty(c->rfd)) {
1.194 markus 238: debug2("channel %d: rfd %d isatty", c->self, c->rfd);
1.91 markus 239: c->isatty = 1;
240: if (!isatty(c->wfd)) {
1.94 markus 241: error("channel %d: wfd %d is not a tty?",
1.91 markus 242: c->self, c->wfd);
243: }
244: } else {
245: c->isatty = 0;
246: }
247:
1.71 markus 248: /* enable nonblocking mode */
249: if (nonblock) {
250: if (rfd != -1)
251: set_nonblock(rfd);
252: if (wfd != -1)
253: set_nonblock(wfd);
254: if (efd != -1)
255: set_nonblock(efd);
256: }
1.52 markus 257: }
258:
259: /*
260: * Allocate a new channel object and set its type and socket. This will cause
261: * remote_name to be freed.
262: */
1.113 markus 263: Channel *
1.52 markus 264: channel_new(char *ctype, int type, int rfd, int wfd, int efd,
1.178 markus 265: u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock)
1.52 markus 266: {
1.209 avsm 267: int found;
268: u_int i;
1.52 markus 269: Channel *c;
1.25 markus 270:
271: /* Do initial allocation if this is the first call. */
272: if (channels_alloc == 0) {
273: channels_alloc = 10;
1.242 djm 274: channels = xcalloc(channels_alloc, sizeof(Channel *));
1.25 markus 275: for (i = 0; i < channels_alloc; i++)
1.113 markus 276: channels[i] = NULL;
1.25 markus 277: }
278: /* Try to find a free slot where to put the new channel. */
279: for (found = -1, i = 0; i < channels_alloc; i++)
1.113 markus 280: if (channels[i] == NULL) {
1.25 markus 281: /* Found a free slot. */
1.209 avsm 282: found = (int)i;
1.25 markus 283: break;
284: }
1.209 avsm 285: if (found < 0) {
1.27 markus 286: /* There are no free slots. Take last+1 slot and expand the array. */
1.25 markus 287: found = channels_alloc;
1.179 markus 288: if (channels_alloc > 10000)
289: fatal("channel_new: internal error: channels_alloc %d "
290: "too big.", channels_alloc);
1.243 djm 291: channels = xrealloc(channels, channels_alloc + 10,
292: sizeof(Channel *));
1.195 markus 293: channels_alloc += 10;
1.70 markus 294: debug2("channel: expanding %d", channels_alloc);
1.25 markus 295: for (i = found; i < channels_alloc; i++)
1.113 markus 296: channels[i] = NULL;
1.25 markus 297: }
1.113 markus 298: /* Initialize and return new channel. */
1.242 djm 299: c = channels[found] = xcalloc(1, sizeof(Channel));
1.25 markus 300: buffer_init(&c->input);
301: buffer_init(&c->output);
1.41 markus 302: buffer_init(&c->extended);
1.159 markus 303: c->ostate = CHAN_OUTPUT_OPEN;
304: c->istate = CHAN_INPUT_OPEN;
305: c->flags = 0;
1.71 markus 306: channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
1.25 markus 307: c->self = found;
308: c->type = type;
1.41 markus 309: c->ctype = ctype;
1.51 markus 310: c->local_window = window;
311: c->local_window_max = window;
312: c->local_consumed = 0;
313: c->local_maxpacket = maxpack;
1.25 markus 314: c->remote_id = -1;
1.190 markus 315: c->remote_name = xstrdup(remote_name);
1.41 markus 316: c->remote_window = 0;
317: c->remote_maxpacket = 0;
1.133 markus 318: c->force_drain = 0;
1.149 markus 319: c->single_connection = 0;
1.131 markus 320: c->detach_user = NULL;
1.225 djm 321: c->detach_close = 0;
1.275 djm 322: c->open_confirm = NULL;
323: c->open_confirm_ctx = NULL;
1.65 markus 324: c->input_filter = NULL;
1.231 reyk 325: c->output_filter = NULL;
1.275 djm 326: TAILQ_INIT(&c->status_confirms);
1.25 markus 327: debug("channel %d: new [%s]", found, remote_name);
1.113 markus 328: return c;
1.1 deraadt 329: }
1.52 markus 330:
1.132 markus 331: static int
332: channel_find_maxfd(void)
333: {
1.209 avsm 334: u_int i;
335: int max = 0;
1.132 markus 336: Channel *c;
337:
338: for (i = 0; i < channels_alloc; i++) {
339: c = channels[i];
340: if (c != NULL) {
341: max = MAX(max, c->rfd);
342: max = MAX(max, c->wfd);
343: max = MAX(max, c->efd);
344: }
345: }
346: return max;
347: }
348:
349: int
350: channel_close_fd(int *fdp)
351: {
352: int ret = 0, fd = *fdp;
353:
354: if (fd != -1) {
355: ret = close(fd);
356: *fdp = -1;
357: if (fd == channel_max_fd)
358: channel_max_fd = channel_find_maxfd();
359: }
360: return ret;
361: }
362:
1.52 markus 363: /* Close all channel fd/socket. */
1.127 itojun 364: static void
1.52 markus 365: channel_close_fds(Channel *c)
366: {
1.204 djm 367: debug3("channel %d: close_fds r %d w %d e %d c %d",
368: c->self, c->rfd, c->wfd, c->efd, c->ctl_fd);
1.118 markus 369:
1.132 markus 370: channel_close_fd(&c->sock);
1.204 djm 371: channel_close_fd(&c->ctl_fd);
1.132 markus 372: channel_close_fd(&c->rfd);
373: channel_close_fd(&c->wfd);
374: channel_close_fd(&c->efd);
1.121 markus 375: }
376:
377: /* Free the channel and close its fd/socket. */
378: void
379: channel_free(Channel *c)
380: {
381: char *s;
1.209 avsm 382: u_int i, n;
1.275 djm 383: struct channel_confirm *cc;
1.121 markus 384:
385: for (n = 0, i = 0; i < channels_alloc; i++)
386: if (channels[i])
387: n++;
1.209 avsm 388: debug("channel %d: free: %s, nchannels %u", c->self,
1.121 markus 389: c->remote_name ? c->remote_name : "???", n);
390:
391: s = channel_open_message();
1.194 markus 392: debug3("channel %d: status: %s", c->self, s);
1.121 markus 393: xfree(s);
394:
395: if (c->sock != -1)
396: shutdown(c->sock, SHUT_RDWR);
1.204 djm 397: if (c->ctl_fd != -1)
398: shutdown(c->ctl_fd, SHUT_RDWR);
1.121 markus 399: channel_close_fds(c);
400: buffer_free(&c->input);
401: buffer_free(&c->output);
402: buffer_free(&c->extended);
403: if (c->remote_name) {
404: xfree(c->remote_name);
405: c->remote_name = NULL;
406: }
1.275 djm 407: while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) {
408: if (cc->abandon_cb != NULL)
409: cc->abandon_cb(c, cc->ctx);
410: TAILQ_REMOVE(&c->status_confirms, cc, entry);
411: bzero(cc, sizeof(*cc));
412: xfree(cc);
413: }
1.121 markus 414: channels[c->self] = NULL;
415: xfree(c);
416: }
417:
418: void
1.126 markus 419: channel_free_all(void)
1.121 markus 420: {
1.209 avsm 421: u_int i;
1.121 markus 422:
1.126 markus 423: for (i = 0; i < channels_alloc; i++)
424: if (channels[i] != NULL)
425: channel_free(channels[i]);
1.131 markus 426: }
427:
1.121 markus 428: /*
429: * Closes the sockets/fds of all channels. This is used to close extra file
430: * descriptors after a fork.
431: */
432: void
1.142 itojun 433: channel_close_all(void)
1.121 markus 434: {
1.209 avsm 435: u_int i;
1.121 markus 436:
437: for (i = 0; i < channels_alloc; i++)
438: if (channels[i] != NULL)
439: channel_close_fds(channels[i]);
440: }
441:
442: /*
1.131 markus 443: * Stop listening to channels.
444: */
445: void
446: channel_stop_listening(void)
447: {
1.209 avsm 448: u_int i;
1.131 markus 449: Channel *c;
450:
451: for (i = 0; i < channels_alloc; i++) {
452: c = channels[i];
453: if (c != NULL) {
454: switch (c->type) {
455: case SSH_CHANNEL_AUTH_SOCKET:
456: case SSH_CHANNEL_PORT_LISTENER:
457: case SSH_CHANNEL_RPORT_LISTENER:
458: case SSH_CHANNEL_X11_LISTENER:
1.132 markus 459: channel_close_fd(&c->sock);
1.131 markus 460: channel_free(c);
461: break;
462: }
463: }
464: }
465: }
466:
467: /*
1.121 markus 468: * Returns true if no channel has too much buffered data, and false if one or
469: * more channel is overfull.
470: */
471: int
1.142 itojun 472: channel_not_very_much_buffered_data(void)
1.121 markus 473: {
474: u_int i;
475: Channel *c;
476:
477: for (i = 0; i < channels_alloc; i++) {
478: c = channels[i];
479: if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
1.136 markus 480: #if 0
481: if (!compat20 &&
482: buffer_len(&c->input) > packet_get_maxsize()) {
1.185 markus 483: debug2("channel %d: big input buffer %d",
1.121 markus 484: c->self, buffer_len(&c->input));
485: return 0;
486: }
1.136 markus 487: #endif
1.121 markus 488: if (buffer_len(&c->output) > packet_get_maxsize()) {
1.191 markus 489: debug2("channel %d: big output buffer %u > %u",
1.136 markus 490: c->self, buffer_len(&c->output),
491: packet_get_maxsize());
1.121 markus 492: return 0;
493: }
494: }
495: }
496: return 1;
497: }
498:
499: /* Returns true if any channel is still open. */
500: int
1.142 itojun 501: channel_still_open(void)
1.121 markus 502: {
1.209 avsm 503: u_int i;
1.121 markus 504: Channel *c;
505:
506: for (i = 0; i < channels_alloc; i++) {
507: c = channels[i];
508: if (c == NULL)
509: continue;
510: switch (c->type) {
511: case SSH_CHANNEL_X11_LISTENER:
512: case SSH_CHANNEL_PORT_LISTENER:
513: case SSH_CHANNEL_RPORT_LISTENER:
514: case SSH_CHANNEL_CLOSED:
515: case SSH_CHANNEL_AUTH_SOCKET:
516: case SSH_CHANNEL_DYNAMIC:
517: case SSH_CHANNEL_CONNECTING:
518: case SSH_CHANNEL_ZOMBIE:
519: continue;
520: case SSH_CHANNEL_LARVAL:
521: if (!compat20)
522: fatal("cannot happen: SSH_CHANNEL_LARVAL");
523: continue;
524: case SSH_CHANNEL_OPENING:
525: case SSH_CHANNEL_OPEN:
526: case SSH_CHANNEL_X11_OPEN:
527: return 1;
528: case SSH_CHANNEL_INPUT_DRAINING:
529: case SSH_CHANNEL_OUTPUT_DRAINING:
530: if (!compat13)
531: fatal("cannot happen: OUT_DRAIN");
532: return 1;
533: default:
534: fatal("channel_still_open: bad channel type %d", c->type);
535: /* NOTREACHED */
536: }
537: }
538: return 0;
539: }
540:
541: /* Returns the id of an open channel suitable for keepaliving */
542: int
1.142 itojun 543: channel_find_open(void)
1.121 markus 544: {
1.209 avsm 545: u_int i;
1.121 markus 546: Channel *c;
547:
548: for (i = 0; i < channels_alloc; i++) {
549: c = channels[i];
1.206 djm 550: if (c == NULL || c->remote_id < 0)
1.121 markus 551: continue;
552: switch (c->type) {
553: case SSH_CHANNEL_CLOSED:
554: case SSH_CHANNEL_DYNAMIC:
555: case SSH_CHANNEL_X11_LISTENER:
556: case SSH_CHANNEL_PORT_LISTENER:
557: case SSH_CHANNEL_RPORT_LISTENER:
558: case SSH_CHANNEL_OPENING:
559: case SSH_CHANNEL_CONNECTING:
560: case SSH_CHANNEL_ZOMBIE:
561: continue;
562: case SSH_CHANNEL_LARVAL:
563: case SSH_CHANNEL_AUTH_SOCKET:
564: case SSH_CHANNEL_OPEN:
565: case SSH_CHANNEL_X11_OPEN:
566: return i;
567: case SSH_CHANNEL_INPUT_DRAINING:
568: case SSH_CHANNEL_OUTPUT_DRAINING:
569: if (!compat13)
570: fatal("cannot happen: OUT_DRAIN");
571: return i;
572: default:
573: fatal("channel_find_open: bad channel type %d", c->type);
574: /* NOTREACHED */
575: }
576: }
577: return -1;
578: }
579:
580:
581: /*
582: * Returns a message describing the currently open forwarded connections,
583: * suitable for sending to the client. The message contains crlf pairs for
584: * newlines.
585: */
586: char *
1.142 itojun 587: channel_open_message(void)
1.121 markus 588: {
589: Buffer buffer;
590: Channel *c;
591: char buf[1024], *cp;
1.209 avsm 592: u_int i;
1.121 markus 593:
594: buffer_init(&buffer);
595: snprintf(buf, sizeof buf, "The following connections are open:\r\n");
596: buffer_append(&buffer, buf, strlen(buf));
597: for (i = 0; i < channels_alloc; i++) {
598: c = channels[i];
599: if (c == NULL)
600: continue;
601: switch (c->type) {
602: case SSH_CHANNEL_X11_LISTENER:
603: case SSH_CHANNEL_PORT_LISTENER:
604: case SSH_CHANNEL_RPORT_LISTENER:
605: case SSH_CHANNEL_CLOSED:
606: case SSH_CHANNEL_AUTH_SOCKET:
607: case SSH_CHANNEL_ZOMBIE:
608: continue;
609: case SSH_CHANNEL_LARVAL:
610: case SSH_CHANNEL_OPENING:
611: case SSH_CHANNEL_CONNECTING:
612: case SSH_CHANNEL_DYNAMIC:
613: case SSH_CHANNEL_OPEN:
614: case SSH_CHANNEL_X11_OPEN:
615: case SSH_CHANNEL_INPUT_DRAINING:
616: case SSH_CHANNEL_OUTPUT_DRAINING:
1.204 djm 617: snprintf(buf, sizeof buf,
618: " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n",
1.121 markus 619: c->self, c->remote_name,
620: c->type, c->remote_id,
621: c->istate, buffer_len(&c->input),
622: c->ostate, buffer_len(&c->output),
1.204 djm 623: c->rfd, c->wfd, c->ctl_fd);
1.121 markus 624: buffer_append(&buffer, buf, strlen(buf));
625: continue;
626: default:
627: fatal("channel_open_message: bad channel type %d", c->type);
628: /* NOTREACHED */
629: }
630: }
631: buffer_append(&buffer, "\0", 1);
632: cp = xstrdup(buffer_ptr(&buffer));
633: buffer_free(&buffer);
634: return cp;
635: }
636:
637: void
638: channel_send_open(int id)
639: {
640: Channel *c = channel_lookup(id);
1.180 deraadt 641:
1.121 markus 642: if (c == NULL) {
1.188 itojun 643: logit("channel_send_open: %d: bad id", id);
1.121 markus 644: return;
645: }
1.184 markus 646: debug2("channel %d: send open", id);
1.121 markus 647: packet_start(SSH2_MSG_CHANNEL_OPEN);
648: packet_put_cstring(c->ctype);
649: packet_put_int(c->self);
650: packet_put_int(c->local_window);
651: packet_put_int(c->local_maxpacket);
652: packet_send();
653: }
654:
655: void
1.184 markus 656: channel_request_start(int id, char *service, int wantconfirm)
1.121 markus 657: {
1.184 markus 658: Channel *c = channel_lookup(id);
1.180 deraadt 659:
1.121 markus 660: if (c == NULL) {
1.188 itojun 661: logit("channel_request_start: %d: unknown channel id", id);
1.121 markus 662: return;
663: }
1.204 djm 664: debug2("channel %d: request %s confirm %d", id, service, wantconfirm);
1.121 markus 665: packet_start(SSH2_MSG_CHANNEL_REQUEST);
666: packet_put_int(c->remote_id);
667: packet_put_cstring(service);
668: packet_put_char(wantconfirm);
669: }
1.241 deraadt 670:
1.121 markus 671: void
1.275 djm 672: channel_register_status_confirm(int id, channel_confirm_cb *cb,
673: channel_confirm_abandon_cb *abandon_cb, void *ctx)
674: {
675: struct channel_confirm *cc;
676: Channel *c;
677:
678: if ((c = channel_lookup(id)) == NULL)
679: fatal("channel_register_expect: %d: bad id", id);
680:
681: cc = xmalloc(sizeof(*cc));
682: cc->cb = cb;
683: cc->abandon_cb = abandon_cb;
684: cc->ctx = ctx;
685: TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry);
686: }
687:
688: void
689: channel_register_open_confirm(int id, channel_callback_fn *fn, void *ctx)
1.121 markus 690: {
691: Channel *c = channel_lookup(id);
1.180 deraadt 692:
1.121 markus 693: if (c == NULL) {
1.275 djm 694: logit("channel_register_open_comfirm: %d: bad id", id);
1.121 markus 695: return;
696: }
1.275 djm 697: c->open_confirm = fn;
698: c->open_confirm_ctx = ctx;
1.121 markus 699: }
1.241 deraadt 700:
1.121 markus 701: void
1.225 djm 702: channel_register_cleanup(int id, channel_callback_fn *fn, int do_close)
1.121 markus 703: {
1.229 markus 704: Channel *c = channel_by_id(id);
1.180 deraadt 705:
1.121 markus 706: if (c == NULL) {
1.188 itojun 707: logit("channel_register_cleanup: %d: bad id", id);
1.121 markus 708: return;
709: }
1.131 markus 710: c->detach_user = fn;
1.225 djm 711: c->detach_close = do_close;
1.121 markus 712: }
1.241 deraadt 713:
1.121 markus 714: void
715: channel_cancel_cleanup(int id)
716: {
1.229 markus 717: Channel *c = channel_by_id(id);
1.180 deraadt 718:
1.121 markus 719: if (c == NULL) {
1.188 itojun 720: logit("channel_cancel_cleanup: %d: bad id", id);
1.121 markus 721: return;
1.52 markus 722: }
1.131 markus 723: c->detach_user = NULL;
1.225 djm 724: c->detach_close = 0;
1.121 markus 725: }
1.241 deraadt 726:
1.121 markus 727: void
1.231 reyk 728: channel_register_filter(int id, channel_infilter_fn *ifn,
729: channel_outfilter_fn *ofn)
1.121 markus 730: {
731: Channel *c = channel_lookup(id);
1.180 deraadt 732:
1.121 markus 733: if (c == NULL) {
1.188 itojun 734: logit("channel_register_filter: %d: bad id", id);
1.121 markus 735: return;
1.52 markus 736: }
1.231 reyk 737: c->input_filter = ifn;
738: c->output_filter = ofn;
1.52 markus 739: }
740:
1.49 markus 741: void
1.121 markus 742: channel_set_fds(int id, int rfd, int wfd, int efd,
1.168 markus 743: int extusage, int nonblock, u_int window_max)
1.1 deraadt 744: {
1.121 markus 745: Channel *c = channel_lookup(id);
1.180 deraadt 746:
1.121 markus 747: if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
748: fatal("channel_activate for non-larval channel %d.", id);
749: channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
750: c->type = SSH_CHANNEL_OPEN;
1.168 markus 751: c->local_window = c->local_window_max = window_max;
1.121 markus 752: packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
753: packet_put_int(c->remote_id);
754: packet_put_int(c->local_window);
755: packet_send();
1.1 deraadt 756: }
757:
1.27 markus 758: /*
1.41 markus 759: * 'channel_pre*' are called just before select() to add any bits relevant to
760: * channels in the select bitmasks.
761: */
762: /*
763: * 'channel_post*': perform any appropriate operations for channels which
764: * have events pending.
1.27 markus 765: */
1.237 deraadt 766: typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset);
1.41 markus 767: chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
768: chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
769:
1.259 stevesk 770: /* ARGSUSED */
1.127 itojun 771: static void
1.237 deraadt 772: channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 773: {
774: FD_SET(c->sock, readset);
775: }
776:
1.259 stevesk 777: /* ARGSUSED */
1.127 itojun 778: static void
1.237 deraadt 779: channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset)
1.75 markus 780: {
781: debug3("channel %d: waiting for connection", c->self);
782: FD_SET(c->sock, writeset);
783: }
784:
1.127 itojun 785: static void
1.237 deraadt 786: channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 787: {
788: if (buffer_len(&c->input) < packet_get_maxsize())
789: FD_SET(c->sock, readset);
790: if (buffer_len(&c->output) > 0)
791: FD_SET(c->sock, writeset);
792: }
1.1 deraadt 793:
1.127 itojun 794: static void
1.237 deraadt 795: channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 796: {
1.157 markus 797: u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
1.41 markus 798:
1.44 markus 799: if (c->istate == CHAN_INPUT_OPEN &&
1.157 markus 800: limit > 0 &&
1.250 djm 801: buffer_len(&c->input) < limit &&
802: buffer_check_alloc(&c->input, CHAN_RBUF))
1.44 markus 803: FD_SET(c->rfd, readset);
804: if (c->ostate == CHAN_OUTPUT_OPEN ||
805: c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
806: if (buffer_len(&c->output) > 0) {
807: FD_SET(c->wfd, writeset);
808: } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
1.172 markus 809: if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
1.223 djm 810: debug2("channel %d: obuf_empty delayed efd %d/(%d)",
811: c->self, c->efd, buffer_len(&c->extended));
1.172 markus 812: else
813: chan_obuf_empty(c);
1.44 markus 814: }
815: }
816: /** XXX check close conditions, too */
1.277 markus 817: if (compat20 && c->efd != -1 &&
818: !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) {
1.44 markus 819: if (c->extended_usage == CHAN_EXTENDED_WRITE &&
820: buffer_len(&c->extended) > 0)
821: FD_SET(c->efd, writeset);
1.172 markus 822: else if (!(c->flags & CHAN_EOF_SENT) &&
823: c->extended_usage == CHAN_EXTENDED_READ &&
1.44 markus 824: buffer_len(&c->extended) < c->remote_window)
825: FD_SET(c->efd, readset);
826: }
1.204 djm 827: /* XXX: What about efd? races? */
1.208 deraadt 828: if (compat20 && c->ctl_fd != -1 &&
1.204 djm 829: c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN)
830: FD_SET(c->ctl_fd, readset);
1.44 markus 831: }
832:
1.259 stevesk 833: /* ARGSUSED */
1.127 itojun 834: static void
1.237 deraadt 835: channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 836: {
837: if (buffer_len(&c->input) == 0) {
838: packet_start(SSH_MSG_CHANNEL_CLOSE);
839: packet_put_int(c->remote_id);
840: packet_send();
841: c->type = SSH_CHANNEL_CLOSED;
1.194 markus 842: debug2("channel %d: closing after input drain.", c->self);
1.41 markus 843: }
844: }
845:
1.259 stevesk 846: /* ARGSUSED */
1.127 itojun 847: static void
1.237 deraadt 848: channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 849: {
850: if (buffer_len(&c->output) == 0)
1.113 markus 851: chan_mark_dead(c);
1.49 markus 852: else
1.41 markus 853: FD_SET(c->sock, writeset);
854: }
855:
856: /*
857: * This is a special state for X11 authentication spoofing. An opened X11
858: * connection (when authentication spoofing is being done) remains in this
859: * state until the first packet has been completely read. The authentication
860: * data in that packet is then substituted by the real data if it matches the
861: * fake data, and the channel is put into normal mode.
1.51 markus 862: * XXX All this happens at the client side.
1.121 markus 863: * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
1.41 markus 864: */
1.127 itojun 865: static int
1.121 markus 866: x11_open_helper(Buffer *b)
1.1 deraadt 867: {
1.77 markus 868: u_char *ucp;
869: u_int proto_len, data_len;
1.25 markus 870:
1.41 markus 871: /* Check if the fixed size part of the packet is in buffer. */
1.121 markus 872: if (buffer_len(b) < 12)
1.41 markus 873: return 0;
874:
875: /* Parse the lengths of variable-length fields. */
1.155 stevesk 876: ucp = buffer_ptr(b);
1.41 markus 877: if (ucp[0] == 0x42) { /* Byte order MSB first. */
878: proto_len = 256 * ucp[6] + ucp[7];
879: data_len = 256 * ucp[8] + ucp[9];
880: } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
881: proto_len = ucp[6] + 256 * ucp[7];
882: data_len = ucp[8] + 256 * ucp[9];
883: } else {
1.194 markus 884: debug2("Initial X11 packet contains bad byte order byte: 0x%x",
1.148 deraadt 885: ucp[0]);
1.41 markus 886: return -1;
887: }
888:
889: /* Check if the whole packet is in buffer. */
1.121 markus 890: if (buffer_len(b) <
1.41 markus 891: 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
892: return 0;
893:
894: /* Check if authentication protocol matches. */
895: if (proto_len != strlen(x11_saved_proto) ||
896: memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
1.194 markus 897: debug2("X11 connection uses different authentication protocol.");
1.41 markus 898: return -1;
899: }
900: /* Check if authentication data matches our fake data. */
901: if (data_len != x11_fake_data_len ||
902: memcmp(ucp + 12 + ((proto_len + 3) & ~3),
903: x11_fake_data, x11_fake_data_len) != 0) {
1.194 markus 904: debug2("X11 auth data does not match fake data.");
1.41 markus 905: return -1;
906: }
907: /* Check fake data length */
908: if (x11_fake_data_len != x11_saved_data_len) {
909: error("X11 fake_data_len %d != saved_data_len %d",
910: x11_fake_data_len, x11_saved_data_len);
911: return -1;
912: }
913: /*
914: * Received authentication protocol and data match
915: * our fake data. Substitute the fake data with real
916: * data.
917: */
918: memcpy(ucp + 12 + ((proto_len + 3) & ~3),
919: x11_saved_data, x11_saved_data_len);
920: return 1;
921: }
922:
1.127 itojun 923: static void
1.237 deraadt 924: channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 925: {
1.121 markus 926: int ret = x11_open_helper(&c->output);
1.180 deraadt 927:
1.41 markus 928: if (ret == 1) {
929: /* Start normal processing for the channel. */
930: c->type = SSH_CHANNEL_OPEN;
1.47 markus 931: channel_pre_open_13(c, readset, writeset);
1.41 markus 932: } else if (ret == -1) {
933: /*
934: * We have received an X11 connection that has bad
935: * authentication information.
936: */
1.188 itojun 937: logit("X11 connection rejected because of wrong authentication.");
1.41 markus 938: buffer_clear(&c->input);
939: buffer_clear(&c->output);
1.132 markus 940: channel_close_fd(&c->sock);
1.41 markus 941: c->sock = -1;
942: c->type = SSH_CHANNEL_CLOSED;
943: packet_start(SSH_MSG_CHANNEL_CLOSE);
944: packet_put_int(c->remote_id);
945: packet_send();
946: }
947: }
1.25 markus 948:
1.127 itojun 949: static void
1.237 deraadt 950: channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 951: {
1.121 markus 952: int ret = x11_open_helper(&c->output);
1.133 markus 953:
954: /* c->force_drain = 1; */
955:
1.41 markus 956: if (ret == 1) {
957: c->type = SSH_CHANNEL_OPEN;
1.157 markus 958: channel_pre_open(c, readset, writeset);
1.41 markus 959: } else if (ret == -1) {
1.188 itojun 960: logit("X11 connection rejected because of wrong authentication.");
1.194 markus 961: debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
1.156 markus 962: chan_read_failed(c);
963: buffer_clear(&c->input);
964: chan_ibuf_empty(c);
965: buffer_clear(&c->output);
966: /* for proto v1, the peer will send an IEOF */
967: if (compat20)
968: chan_write_failed(c);
969: else
970: c->type = SSH_CHANNEL_OPEN;
1.194 markus 971: debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
1.41 markus 972: }
973: }
1.25 markus 974:
1.104 markus 975: /* try to decode a socks4 header */
1.259 stevesk 976: /* ARGSUSED */
1.127 itojun 977: static int
1.237 deraadt 978: channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset)
1.103 markus 979: {
1.181 markus 980: char *p, *host;
1.217 djm 981: u_int len, have, i, found;
1.148 deraadt 982: char username[256];
1.103 markus 983: struct {
984: u_int8_t version;
985: u_int8_t command;
986: u_int16_t dest_port;
1.104 markus 987: struct in_addr dest_addr;
1.103 markus 988: } s4_req, s4_rsp;
989:
1.104 markus 990: debug2("channel %d: decode socks4", c->self);
1.109 markus 991:
992: have = buffer_len(&c->input);
993: len = sizeof(s4_req);
994: if (have < len)
995: return 0;
996: p = buffer_ptr(&c->input);
997: for (found = 0, i = len; i < have; i++) {
998: if (p[i] == '\0') {
999: found = 1;
1000: break;
1001: }
1002: if (i > 1024) {
1003: /* the peer is probably sending garbage */
1004: debug("channel %d: decode socks4: too long",
1005: c->self);
1006: return -1;
1007: }
1008: }
1009: if (!found)
1010: return 0;
1.103 markus 1011: buffer_get(&c->input, (char *)&s4_req.version, 1);
1012: buffer_get(&c->input, (char *)&s4_req.command, 1);
1013: buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
1.104 markus 1014: buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
1.109 markus 1015: have = buffer_len(&c->input);
1.103 markus 1016: p = buffer_ptr(&c->input);
1017: len = strlen(p);
1.106 markus 1018: debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
1.103 markus 1019: if (len > have)
1.104 markus 1020: fatal("channel %d: decode socks4: len %d > have %d",
1.103 markus 1021: c->self, len, have);
1022: strlcpy(username, p, sizeof(username));
1023: buffer_consume(&c->input, len);
1024: buffer_consume(&c->input, 1); /* trailing '\0' */
1025:
1.104 markus 1026: host = inet_ntoa(s4_req.dest_addr);
1.103 markus 1027: strlcpy(c->path, host, sizeof(c->path));
1028: c->host_port = ntohs(s4_req.dest_port);
1.148 deraadt 1029:
1.194 markus 1030: debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
1.106 markus 1031: c->self, host, c->host_port, s4_req.command);
1.103 markus 1032:
1.104 markus 1033: if (s4_req.command != 1) {
1034: debug("channel %d: cannot handle: socks4 cn %d",
1035: c->self, s4_req.command);
1036: return -1;
1.103 markus 1037: }
1.104 markus 1038: s4_rsp.version = 0; /* vn: 0 for reply */
1039: s4_rsp.command = 90; /* cd: req granted */
1.103 markus 1040: s4_rsp.dest_port = 0; /* ignored */
1.104 markus 1041: s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
1.246 deraadt 1042: buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp));
1.104 markus 1043: return 1;
1044: }
1045:
1.193 markus 1046: /* try to decode a socks5 header */
1047: #define SSH_SOCKS5_AUTHDONE 0x1000
1048: #define SSH_SOCKS5_NOAUTH 0x00
1049: #define SSH_SOCKS5_IPV4 0x01
1050: #define SSH_SOCKS5_DOMAIN 0x03
1051: #define SSH_SOCKS5_IPV6 0x04
1052: #define SSH_SOCKS5_CONNECT 0x01
1053: #define SSH_SOCKS5_SUCCESS 0x00
1054:
1.259 stevesk 1055: /* ARGSUSED */
1.193 markus 1056: static int
1.237 deraadt 1057: channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset)
1.193 markus 1058: {
1059: struct {
1060: u_int8_t version;
1061: u_int8_t command;
1062: u_int8_t reserved;
1063: u_int8_t atyp;
1064: } s5_req, s5_rsp;
1065: u_int16_t dest_port;
1066: u_char *p, dest_addr[255+1];
1.252 djm 1067: u_int have, need, i, found, nmethods, addrlen, af;
1.193 markus 1068:
1069: debug2("channel %d: decode socks5", c->self);
1070: p = buffer_ptr(&c->input);
1071: if (p[0] != 0x05)
1072: return -1;
1073: have = buffer_len(&c->input);
1074: if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
1075: /* format: ver | nmethods | methods */
1.198 djm 1076: if (have < 2)
1.193 markus 1077: return 0;
1078: nmethods = p[1];
1079: if (have < nmethods + 2)
1080: return 0;
1081: /* look for method: "NO AUTHENTICATION REQUIRED" */
1.268 stevesk 1082: for (found = 0, i = 2; i < nmethods + 2; i++) {
1.264 stevesk 1083: if (p[i] == SSH_SOCKS5_NOAUTH) {
1.193 markus 1084: found = 1;
1085: break;
1086: }
1087: }
1088: if (!found) {
1089: debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
1090: c->self);
1091: return -1;
1092: }
1093: buffer_consume(&c->input, nmethods + 2);
1094: buffer_put_char(&c->output, 0x05); /* version */
1095: buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
1096: FD_SET(c->sock, writeset);
1097: c->flags |= SSH_SOCKS5_AUTHDONE;
1098: debug2("channel %d: socks5 auth done", c->self);
1099: return 0; /* need more */
1100: }
1101: debug2("channel %d: socks5 post auth", c->self);
1102: if (have < sizeof(s5_req)+1)
1103: return 0; /* need more */
1.247 deraadt 1104: memcpy(&s5_req, p, sizeof(s5_req));
1.193 markus 1105: if (s5_req.version != 0x05 ||
1106: s5_req.command != SSH_SOCKS5_CONNECT ||
1107: s5_req.reserved != 0x00) {
1.194 markus 1108: debug2("channel %d: only socks5 connect supported", c->self);
1.193 markus 1109: return -1;
1110: }
1.213 deraadt 1111: switch (s5_req.atyp){
1.193 markus 1112: case SSH_SOCKS5_IPV4:
1113: addrlen = 4;
1114: af = AF_INET;
1115: break;
1116: case SSH_SOCKS5_DOMAIN:
1117: addrlen = p[sizeof(s5_req)];
1118: af = -1;
1119: break;
1120: case SSH_SOCKS5_IPV6:
1121: addrlen = 16;
1122: af = AF_INET6;
1123: break;
1124: default:
1.194 markus 1125: debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
1.193 markus 1126: return -1;
1127: }
1.252 djm 1128: need = sizeof(s5_req) + addrlen + 2;
1129: if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1130: need++;
1131: if (have < need)
1.193 markus 1132: return 0;
1133: buffer_consume(&c->input, sizeof(s5_req));
1134: if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1135: buffer_consume(&c->input, 1); /* host string length */
1136: buffer_get(&c->input, (char *)&dest_addr, addrlen);
1137: buffer_get(&c->input, (char *)&dest_port, 2);
1138: dest_addr[addrlen] = '\0';
1139: if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1.201 deraadt 1140: strlcpy(c->path, (char *)dest_addr, sizeof(c->path));
1.193 markus 1141: else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL)
1142: return -1;
1143: c->host_port = ntohs(dest_port);
1.198 djm 1144:
1.194 markus 1145: debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
1.193 markus 1146: c->self, c->path, c->host_port, s5_req.command);
1147:
1148: s5_rsp.version = 0x05;
1149: s5_rsp.command = SSH_SOCKS5_SUCCESS;
1150: s5_rsp.reserved = 0; /* ignored */
1151: s5_rsp.atyp = SSH_SOCKS5_IPV4;
1152: ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY;
1153: dest_port = 0; /* ignored */
1154:
1.246 deraadt 1155: buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp));
1156: buffer_append(&c->output, &dest_addr, sizeof(struct in_addr));
1157: buffer_append(&c->output, &dest_port, sizeof(dest_port));
1.193 markus 1158: return 1;
1159: }
1160:
1.104 markus 1161: /* dynamic port forwarding */
1.127 itojun 1162: static void
1.237 deraadt 1163: channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset)
1.104 markus 1164: {
1165: u_char *p;
1.217 djm 1166: u_int have;
1167: int ret;
1.103 markus 1168:
1.104 markus 1169: have = buffer_len(&c->input);
1.137 markus 1170: c->delayed = 0;
1.104 markus 1171: debug2("channel %d: pre_dynamic: have %d", c->self, have);
1.105 markus 1172: /* buffer_dump(&c->input); */
1.104 markus 1173: /* check if the fixed size part of the packet is in buffer. */
1.193 markus 1174: if (have < 3) {
1.104 markus 1175: /* need more */
1176: FD_SET(c->sock, readset);
1177: return;
1178: }
1179: /* try to guess the protocol */
1180: p = buffer_ptr(&c->input);
1181: switch (p[0]) {
1182: case 0x04:
1183: ret = channel_decode_socks4(c, readset, writeset);
1.193 markus 1184: break;
1185: case 0x05:
1186: ret = channel_decode_socks5(c, readset, writeset);
1.104 markus 1187: break;
1188: default:
1189: ret = -1;
1190: break;
1191: }
1192: if (ret < 0) {
1.113 markus 1193: chan_mark_dead(c);
1.104 markus 1194: } else if (ret == 0) {
1195: debug2("channel %d: pre_dynamic: need more", c->self);
1196: /* need more */
1197: FD_SET(c->sock, readset);
1198: } else {
1199: /* switch to the next state */
1200: c->type = SSH_CHANNEL_OPENING;
1201: port_open_helper(c, "direct-tcpip");
1202: }
1.103 markus 1203: }
1204:
1.41 markus 1205: /* This is our fake X11 server socket. */
1.259 stevesk 1206: /* ARGSUSED */
1.127 itojun 1207: static void
1.237 deraadt 1208: channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 1209: {
1.113 markus 1210: Channel *nc;
1.41 markus 1211: struct sockaddr addr;
1.162 stevesk 1212: int newsock;
1.41 markus 1213: socklen_t addrlen;
1.85 markus 1214: char buf[16384], *remote_ipaddr;
1.51 markus 1215: int remote_port;
1.25 markus 1216:
1.41 markus 1217: if (FD_ISSET(c->sock, readset)) {
1218: debug("X11 connection requested.");
1219: addrlen = sizeof(addr);
1220: newsock = accept(c->sock, &addr, &addrlen);
1.149 markus 1221: if (c->single_connection) {
1.194 markus 1222: debug2("single_connection: closing X11 listener.");
1.149 markus 1223: channel_close_fd(&c->sock);
1224: chan_mark_dead(c);
1225: }
1.41 markus 1226: if (newsock < 0) {
1227: error("accept: %.100s", strerror(errno));
1228: return;
1229: }
1.162 stevesk 1230: set_nodelay(newsock);
1.85 markus 1231: remote_ipaddr = get_peer_ipaddr(newsock);
1.51 markus 1232: remote_port = get_peer_port(newsock);
1.41 markus 1233: snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
1.85 markus 1234: remote_ipaddr, remote_port);
1.51 markus 1235:
1.113 markus 1236: nc = channel_new("accepted x11 socket",
1.51 markus 1237: SSH_CHANNEL_OPENING, newsock, newsock, -1,
1.190 markus 1238: c->local_window_max, c->local_maxpacket, 0, buf, 1);
1.51 markus 1239: if (compat20) {
1240: packet_start(SSH2_MSG_CHANNEL_OPEN);
1241: packet_put_cstring("x11");
1.113 markus 1242: packet_put_int(nc->self);
1.149 markus 1243: packet_put_int(nc->local_window_max);
1244: packet_put_int(nc->local_maxpacket);
1.85 markus 1245: /* originator ipaddr and port */
1246: packet_put_cstring(remote_ipaddr);
1.57 markus 1247: if (datafellows & SSH_BUG_X11FWD) {
1.194 markus 1248: debug2("ssh2 x11 bug compat mode");
1.57 markus 1249: } else {
1250: packet_put_int(remote_port);
1251: }
1.51 markus 1252: packet_send();
1253: } else {
1254: packet_start(SSH_SMSG_X11_OPEN);
1.113 markus 1255: packet_put_int(nc->self);
1.121 markus 1256: if (packet_get_protocol_flags() &
1257: SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
1.125 markus 1258: packet_put_cstring(buf);
1.51 markus 1259: packet_send();
1260: }
1.85 markus 1261: xfree(remote_ipaddr);
1.41 markus 1262: }
1263: }
1.25 markus 1264:
1.127 itojun 1265: static void
1.103 markus 1266: port_open_helper(Channel *c, char *rtype)
1267: {
1268: int direct;
1269: char buf[1024];
1270: char *remote_ipaddr = get_peer_ipaddr(c->sock);
1.216 markus 1271: int remote_port = get_peer_port(c->sock);
1.103 markus 1272:
1273: direct = (strcmp(rtype, "direct-tcpip") == 0);
1274:
1275: snprintf(buf, sizeof buf,
1276: "%s: listening port %d for %.100s port %d, "
1277: "connect from %.200s port %d",
1278: rtype, c->listening_port, c->path, c->host_port,
1279: remote_ipaddr, remote_port);
1280:
1281: xfree(c->remote_name);
1282: c->remote_name = xstrdup(buf);
1283:
1284: if (compat20) {
1285: packet_start(SSH2_MSG_CHANNEL_OPEN);
1286: packet_put_cstring(rtype);
1287: packet_put_int(c->self);
1288: packet_put_int(c->local_window_max);
1289: packet_put_int(c->local_maxpacket);
1290: if (direct) {
1291: /* target host, port */
1292: packet_put_cstring(c->path);
1293: packet_put_int(c->host_port);
1294: } else {
1295: /* listen address, port */
1296: packet_put_cstring(c->path);
1297: packet_put_int(c->listening_port);
1298: }
1299: /* originator host and port */
1300: packet_put_cstring(remote_ipaddr);
1.216 markus 1301: packet_put_int((u_int)remote_port);
1.103 markus 1302: packet_send();
1303: } else {
1304: packet_start(SSH_MSG_PORT_OPEN);
1305: packet_put_int(c->self);
1306: packet_put_cstring(c->path);
1307: packet_put_int(c->host_port);
1.121 markus 1308: if (packet_get_protocol_flags() &
1309: SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
1.103 markus 1310: packet_put_cstring(c->remote_name);
1311: packet_send();
1312: }
1313: xfree(remote_ipaddr);
1314: }
1315:
1.226 djm 1316: static void
1317: channel_set_reuseaddr(int fd)
1318: {
1319: int on = 1;
1320:
1321: /*
1322: * Set socket options.
1323: * Allow local port reuse in TIME_WAIT.
1324: */
1325: if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1)
1326: error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
1327: }
1328:
1.41 markus 1329: /*
1330: * This socket is listening for connections to a forwarded TCP/IP port.
1331: */
1.259 stevesk 1332: /* ARGSUSED */
1.127 itojun 1333: static void
1.237 deraadt 1334: channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 1335: {
1.103 markus 1336: Channel *nc;
1.41 markus 1337: struct sockaddr addr;
1.113 markus 1338: int newsock, nextstate;
1.41 markus 1339: socklen_t addrlen;
1.103 markus 1340: char *rtype;
1.73 markus 1341:
1.41 markus 1342: if (FD_ISSET(c->sock, readset)) {
1343: debug("Connection to port %d forwarding "
1344: "to %.100s port %d requested.",
1345: c->listening_port, c->path, c->host_port);
1.103 markus 1346:
1.137 markus 1347: if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1348: nextstate = SSH_CHANNEL_OPENING;
1349: rtype = "forwarded-tcpip";
1350: } else {
1351: if (c->host_port == 0) {
1352: nextstate = SSH_CHANNEL_DYNAMIC;
1.138 markus 1353: rtype = "dynamic-tcpip";
1.137 markus 1354: } else {
1355: nextstate = SSH_CHANNEL_OPENING;
1356: rtype = "direct-tcpip";
1357: }
1358: }
1.103 markus 1359:
1.41 markus 1360: addrlen = sizeof(addr);
1361: newsock = accept(c->sock, &addr, &addrlen);
1362: if (newsock < 0) {
1363: error("accept: %.100s", strerror(errno));
1364: return;
1365: }
1.169 stevesk 1366: set_nodelay(newsock);
1.190 markus 1367: nc = channel_new(rtype, nextstate, newsock, newsock, -1,
1368: c->local_window_max, c->local_maxpacket, 0, rtype, 1);
1.103 markus 1369: nc->listening_port = c->listening_port;
1370: nc->host_port = c->host_port;
1371: strlcpy(nc->path, c->path, sizeof(nc->path));
1372:
1.137 markus 1373: if (nextstate == SSH_CHANNEL_DYNAMIC) {
1374: /*
1375: * do not call the channel_post handler until
1376: * this flag has been reset by a pre-handler.
1377: * otherwise the FD_ISSET calls might overflow
1378: */
1379: nc->delayed = 1;
1380: } else {
1.103 markus 1381: port_open_helper(nc, rtype);
1.137 markus 1382: }
1.41 markus 1383: }
1384: }
1.25 markus 1385:
1.41 markus 1386: /*
1387: * This is the authentication agent socket listening for connections from
1388: * clients.
1389: */
1.259 stevesk 1390: /* ARGSUSED */
1.127 itojun 1391: static void
1.237 deraadt 1392: channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 1393: {
1.113 markus 1394: Channel *nc;
1395: int newsock;
1.41 markus 1396: struct sockaddr addr;
1397: socklen_t addrlen;
1.25 markus 1398:
1.41 markus 1399: if (FD_ISSET(c->sock, readset)) {
1400: addrlen = sizeof(addr);
1401: newsock = accept(c->sock, &addr, &addrlen);
1402: if (newsock < 0) {
1403: error("accept from auth socket: %.100s", strerror(errno));
1404: return;
1405: }
1.113 markus 1406: nc = channel_new("accepted auth socket",
1.73 markus 1407: SSH_CHANNEL_OPENING, newsock, newsock, -1,
1408: c->local_window_max, c->local_maxpacket,
1.190 markus 1409: 0, "accepted auth socket", 1);
1.73 markus 1410: if (compat20) {
1411: packet_start(SSH2_MSG_CHANNEL_OPEN);
1412: packet_put_cstring("auth-agent@openssh.com");
1.113 markus 1413: packet_put_int(nc->self);
1.73 markus 1414: packet_put_int(c->local_window_max);
1415: packet_put_int(c->local_maxpacket);
1416: } else {
1417: packet_start(SSH_SMSG_AGENT_OPEN);
1.113 markus 1418: packet_put_int(nc->self);
1.73 markus 1419: }
1.41 markus 1420: packet_send();
1421: }
1422: }
1.25 markus 1423:
1.259 stevesk 1424: /* ARGSUSED */
1.127 itojun 1425: static void
1.237 deraadt 1426: channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset)
1.75 markus 1427: {
1.276 djm 1428: int err = 0, sock;
1.129 stevesk 1429: socklen_t sz = sizeof(err);
1.114 markus 1430:
1.75 markus 1431: if (FD_ISSET(c->sock, writeset)) {
1.170 stevesk 1432: if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
1.114 markus 1433: err = errno;
1434: error("getsockopt SO_ERROR failed");
1435: }
1436: if (err == 0) {
1.276 djm 1437: debug("channel %d: connected to %s port %d",
1438: c->self, c->connect_ctx.host, c->connect_ctx.port);
1439: channel_connect_ctx_free(&c->connect_ctx);
1.114 markus 1440: c->type = SSH_CHANNEL_OPEN;
1441: if (compat20) {
1442: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1443: packet_put_int(c->remote_id);
1444: packet_put_int(c->self);
1445: packet_put_int(c->local_window);
1446: packet_put_int(c->local_maxpacket);
1447: } else {
1448: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1449: packet_put_int(c->remote_id);
1450: packet_put_int(c->self);
1451: }
1.75 markus 1452: } else {
1.276 djm 1453: debug("channel %d: connection failed: %s",
1.114 markus 1454: c->self, strerror(err));
1.276 djm 1455: /* Try next address, if any */
1456: if ((sock = connect_next(&c->connect_ctx)) > 0) {
1457: close(c->sock);
1458: c->sock = c->rfd = c->wfd = sock;
1459: channel_max_fd = channel_find_maxfd();
1460: return;
1461: }
1462: /* Exhausted all addresses */
1463: error("connect_to %.100s port %d: failed.",
1464: c->connect_ctx.host, c->connect_ctx.port);
1465: channel_connect_ctx_free(&c->connect_ctx);
1.114 markus 1466: if (compat20) {
1467: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1468: packet_put_int(c->remote_id);
1469: packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1470: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1471: packet_put_cstring(strerror(err));
1472: packet_put_cstring("");
1473: }
1.75 markus 1474: } else {
1.114 markus 1475: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1476: packet_put_int(c->remote_id);
1.75 markus 1477: }
1.114 markus 1478: chan_mark_dead(c);
1.75 markus 1479: }
1.114 markus 1480: packet_send();
1.75 markus 1481: }
1482: }
1483:
1.259 stevesk 1484: /* ARGSUSED */
1.127 itojun 1485: static int
1.237 deraadt 1486: channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 1487: {
1.214 markus 1488: char buf[CHAN_RBUF];
1.41 markus 1489: int len;
1.25 markus 1490:
1.118 markus 1491: if (c->rfd != -1 &&
1.41 markus 1492: FD_ISSET(c->rfd, readset)) {
1493: len = read(c->rfd, buf, sizeof(buf));
1.53 markus 1494: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1495: return 1;
1.41 markus 1496: if (len <= 0) {
1.194 markus 1497: debug2("channel %d: read<=0 rfd %d len %d",
1.41 markus 1498: c->self, c->rfd, len);
1.104 markus 1499: if (c->type != SSH_CHANNEL_OPEN) {
1.194 markus 1500: debug2("channel %d: not open", c->self);
1.113 markus 1501: chan_mark_dead(c);
1.103 markus 1502: return -1;
1.104 markus 1503: } else if (compat13) {
1.158 markus 1504: buffer_clear(&c->output);
1.41 markus 1505: c->type = SSH_CHANNEL_INPUT_DRAINING;
1.194 markus 1506: debug2("channel %d: input draining.", c->self);
1.25 markus 1507: } else {
1.41 markus 1508: chan_read_failed(c);
1.25 markus 1509: }
1.41 markus 1510: return -1;
1511: }
1.143 deraadt 1512: if (c->input_filter != NULL) {
1.66 markus 1513: if (c->input_filter(c, buf, len) == -1) {
1.194 markus 1514: debug2("channel %d: filter stops", c->self);
1.65 markus 1515: chan_read_failed(c);
1516: }
1.228 reyk 1517: } else if (c->datagram) {
1518: buffer_put_string(&c->input, buf, len);
1.65 markus 1519: } else {
1520: buffer_append(&c->input, buf, len);
1521: }
1.41 markus 1522: }
1523: return 1;
1524: }
1.241 deraadt 1525:
1.259 stevesk 1526: /* ARGSUSED */
1.127 itojun 1527: static int
1.237 deraadt 1528: channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 1529: {
1.95 markus 1530: struct termios tio;
1.231 reyk 1531: u_char *data = NULL, *buf;
1.134 markus 1532: u_int dlen;
1.41 markus 1533: int len;
1.25 markus 1534:
1.41 markus 1535: /* Send buffered output data to the socket. */
1.118 markus 1536: if (c->wfd != -1 &&
1.41 markus 1537: FD_ISSET(c->wfd, writeset) &&
1538: buffer_len(&c->output) > 0) {
1.231 reyk 1539: if (c->output_filter != NULL) {
1540: if ((buf = c->output_filter(c, &data, &dlen)) == NULL) {
1541: debug2("channel %d: filter stops", c->self);
1.232 reyk 1542: if (c->type != SSH_CHANNEL_OPEN)
1543: chan_mark_dead(c);
1544: else
1545: chan_write_failed(c);
1546: return -1;
1.231 reyk 1547: }
1548: } else if (c->datagram) {
1549: buf = data = buffer_get_string(&c->output, &dlen);
1550: } else {
1551: buf = data = buffer_ptr(&c->output);
1552: dlen = buffer_len(&c->output);
1553: }
1554:
1.228 reyk 1555: if (c->datagram) {
1556: /* ignore truncated writes, datagrams might get lost */
1557: c->local_consumed += dlen + 4;
1.231 reyk 1558: len = write(c->wfd, buf, dlen);
1.228 reyk 1559: xfree(data);
1560: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1561: return 1;
1562: if (len <= 0) {
1563: if (c->type != SSH_CHANNEL_OPEN)
1564: chan_mark_dead(c);
1565: else
1566: chan_write_failed(c);
1567: return -1;
1568: }
1569: return 1;
1570: }
1.231 reyk 1571:
1572: len = write(c->wfd, buf, dlen);
1.53 markus 1573: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1574: return 1;
1.41 markus 1575: if (len <= 0) {
1.104 markus 1576: if (c->type != SSH_CHANNEL_OPEN) {
1.194 markus 1577: debug2("channel %d: not open", c->self);
1.113 markus 1578: chan_mark_dead(c);
1.104 markus 1579: return -1;
1580: } else if (compat13) {
1.158 markus 1581: buffer_clear(&c->output);
1.194 markus 1582: debug2("channel %d: input draining.", c->self);
1.41 markus 1583: c->type = SSH_CHANNEL_INPUT_DRAINING;
1584: } else {
1585: chan_write_failed(c);
1586: }
1587: return -1;
1.91 markus 1588: }
1.231 reyk 1589: if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') {
1.91 markus 1590: if (tcgetattr(c->wfd, &tio) == 0 &&
1591: !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1592: /*
1593: * Simulate echo to reduce the impact of
1.96 markus 1594: * traffic analysis. We need to match the
1.95 markus 1595: * size of a SSH2_MSG_CHANNEL_DATA message
1.231 reyk 1596: * (4 byte channel id + buf)
1.91 markus 1597: */
1.95 markus 1598: packet_send_ignore(4 + len);
1.91 markus 1599: packet_send();
1600: }
1.25 markus 1601: }
1.41 markus 1602: buffer_consume(&c->output, len);
1.44 markus 1603: if (compat20 && len > 0) {
1604: c->local_consumed += len;
1605: }
1606: }
1607: return 1;
1608: }
1.241 deraadt 1609:
1.127 itojun 1610: static int
1.237 deraadt 1611: channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset)
1.44 markus 1612: {
1.214 markus 1613: char buf[CHAN_RBUF];
1.44 markus 1614: int len;
1615:
1.45 markus 1616: /** XXX handle drain efd, too */
1.44 markus 1617: if (c->efd != -1) {
1618: if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1619: FD_ISSET(c->efd, writeset) &&
1620: buffer_len(&c->extended) > 0) {
1621: len = write(c->efd, buffer_ptr(&c->extended),
1622: buffer_len(&c->extended));
1.70 markus 1623: debug2("channel %d: written %d to efd %d",
1.44 markus 1624: c->self, len, c->efd);
1.93 markus 1625: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1626: return 1;
1627: if (len <= 0) {
1628: debug2("channel %d: closing write-efd %d",
1629: c->self, c->efd);
1.132 markus 1630: channel_close_fd(&c->efd);
1.93 markus 1631: } else {
1.44 markus 1632: buffer_consume(&c->extended, len);
1633: c->local_consumed += len;
1634: }
1635: } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1636: FD_ISSET(c->efd, readset)) {
1637: len = read(c->efd, buf, sizeof(buf));
1.70 markus 1638: debug2("channel %d: read %d from efd %d",
1.148 deraadt 1639: c->self, len, c->efd);
1.93 markus 1640: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1641: return 1;
1642: if (len <= 0) {
1643: debug2("channel %d: closing read-efd %d",
1.45 markus 1644: c->self, c->efd);
1.132 markus 1645: channel_close_fd(&c->efd);
1.93 markus 1646: } else {
1.44 markus 1647: buffer_append(&c->extended, buf, len);
1.93 markus 1648: }
1.44 markus 1649: }
1650: }
1651: return 1;
1652: }
1.241 deraadt 1653:
1.259 stevesk 1654: /* ARGSUSED */
1.127 itojun 1655: static int
1.237 deraadt 1656: channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset)
1.204 djm 1657: {
1658: char buf[16];
1659: int len;
1660:
1661: /* Monitor control fd to detect if the slave client exits */
1662: if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) {
1663: len = read(c->ctl_fd, buf, sizeof(buf));
1664: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1665: return 1;
1666: if (len <= 0) {
1667: debug2("channel %d: ctl read<=0", c->self);
1668: if (c->type != SSH_CHANNEL_OPEN) {
1669: debug2("channel %d: not open", c->self);
1670: chan_mark_dead(c);
1671: return -1;
1672: } else {
1673: chan_read_failed(c);
1674: chan_write_failed(c);
1675: }
1676: return -1;
1677: } else
1678: fatal("%s: unexpected data on ctl fd", __func__);
1679: }
1680: return 1;
1681: }
1.241 deraadt 1682:
1.204 djm 1683: static int
1.93 markus 1684: channel_check_window(Channel *c)
1.44 markus 1685: {
1.104 markus 1686: if (c->type == SSH_CHANNEL_OPEN &&
1687: !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
1.270 dtucker 1688: ((c->local_window_max - c->local_window >
1.269 markus 1689: c->local_maxpacket*3) ||
1690: c->local_window < c->local_window_max/2) &&
1.44 markus 1691: c->local_consumed > 0) {
1692: packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1693: packet_put_int(c->remote_id);
1694: packet_put_int(c->local_consumed);
1695: packet_send();
1.70 markus 1696: debug2("channel %d: window %d sent adjust %d",
1.44 markus 1697: c->self, c->local_window,
1698: c->local_consumed);
1699: c->local_window += c->local_consumed;
1700: c->local_consumed = 0;
1.1 deraadt 1701: }
1.41 markus 1702: return 1;
1.1 deraadt 1703: }
1704:
1.127 itojun 1705: static void
1.237 deraadt 1706: channel_post_open(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 1707: {
1.137 markus 1708: if (c->delayed)
1709: return;
1.41 markus 1710: channel_handle_rfd(c, readset, writeset);
1711: channel_handle_wfd(c, readset, writeset);
1.157 markus 1712: if (!compat20)
1.137 markus 1713: return;
1.44 markus 1714: channel_handle_efd(c, readset, writeset);
1.204 djm 1715: channel_handle_ctl(c, readset, writeset);
1.93 markus 1716: channel_check_window(c);
1.44 markus 1717: }
1718:
1.259 stevesk 1719: /* ARGSUSED */
1.127 itojun 1720: static void
1.237 deraadt 1721: channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset)
1.1 deraadt 1722: {
1.41 markus 1723: int len;
1.180 deraadt 1724:
1.41 markus 1725: /* Send buffered output data to the socket. */
1726: if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1727: len = write(c->sock, buffer_ptr(&c->output),
1728: buffer_len(&c->output));
1729: if (len <= 0)
1.158 markus 1730: buffer_clear(&c->output);
1.41 markus 1731: else
1732: buffer_consume(&c->output, len);
1733: }
1734: }
1.25 markus 1735:
1.127 itojun 1736: static void
1.44 markus 1737: channel_handler_init_20(void)
1738: {
1.157 markus 1739: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
1.51 markus 1740: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
1.44 markus 1741: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1.73 markus 1742: channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
1.51 markus 1743: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1.73 markus 1744: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1.75 markus 1745: channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
1.103 markus 1746: channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.44 markus 1747:
1.157 markus 1748: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
1.44 markus 1749: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1.73 markus 1750: channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
1.51 markus 1751: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1.73 markus 1752: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1.75 markus 1753: channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
1.157 markus 1754: channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
1.44 markus 1755: }
1756:
1.127 itojun 1757: static void
1.41 markus 1758: channel_handler_init_13(void)
1759: {
1760: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1761: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1762: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1763: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1764: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1765: channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1766: channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
1.75 markus 1767: channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
1.103 markus 1768: channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.25 markus 1769:
1.157 markus 1770: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
1.41 markus 1771: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1772: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1773: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1774: channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
1.75 markus 1775: channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
1.157 markus 1776: channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
1.41 markus 1777: }
1.25 markus 1778:
1.127 itojun 1779: static void
1.41 markus 1780: channel_handler_init_15(void)
1781: {
1.157 markus 1782: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
1.51 markus 1783: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
1.41 markus 1784: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1785: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1786: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1.75 markus 1787: channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
1.103 markus 1788: channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.25 markus 1789:
1.41 markus 1790: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1791: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1792: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1.157 markus 1793: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
1.75 markus 1794: channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
1.157 markus 1795: channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
1.41 markus 1796: }
1.27 markus 1797:
1.127 itojun 1798: static void
1.41 markus 1799: channel_handler_init(void)
1800: {
1801: int i;
1.180 deraadt 1802:
1.148 deraadt 1803: for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
1.41 markus 1804: channel_pre[i] = NULL;
1805: channel_post[i] = NULL;
1806: }
1.44 markus 1807: if (compat20)
1808: channel_handler_init_20();
1809: else if (compat13)
1.41 markus 1810: channel_handler_init_13();
1811: else
1812: channel_handler_init_15();
1813: }
1.25 markus 1814:
1.140 markus 1815: /* gc dead channels */
1816: static void
1817: channel_garbage_collect(Channel *c)
1818: {
1819: if (c == NULL)
1820: return;
1821: if (c->detach_user != NULL) {
1.225 djm 1822: if (!chan_is_dead(c, c->detach_close))
1.140 markus 1823: return;
1.194 markus 1824: debug2("channel %d: gc: notify user", c->self);
1.140 markus 1825: c->detach_user(c->self, NULL);
1826: /* if we still have a callback */
1827: if (c->detach_user != NULL)
1828: return;
1.194 markus 1829: debug2("channel %d: gc: user detached", c->self);
1.140 markus 1830: }
1831: if (!chan_is_dead(c, 1))
1832: return;
1.194 markus 1833: debug2("channel %d: garbage collecting", c->self);
1.140 markus 1834: channel_free(c);
1835: }
1836:
1.127 itojun 1837: static void
1.237 deraadt 1838: channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset)
1.41 markus 1839: {
1840: static int did_init = 0;
1.209 avsm 1841: u_int i;
1.41 markus 1842: Channel *c;
1.25 markus 1843:
1.41 markus 1844: if (!did_init) {
1845: channel_handler_init();
1846: did_init = 1;
1847: }
1848: for (i = 0; i < channels_alloc; i++) {
1.113 markus 1849: c = channels[i];
1850: if (c == NULL)
1.41 markus 1851: continue;
1.118 markus 1852: if (ftab[c->type] != NULL)
1853: (*ftab[c->type])(c, readset, writeset);
1.140 markus 1854: channel_garbage_collect(c);
1.1 deraadt 1855: }
1856: }
1857:
1.121 markus 1858: /*
1859: * Allocate/update select bitmasks and add any bits relevant to channels in
1860: * select bitmasks.
1861: */
1.49 markus 1862: void
1.100 markus 1863: channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
1.209 avsm 1864: u_int *nallocp, int rekeying)
1.41 markus 1865: {
1.243 djm 1866: u_int n, sz, nfdset;
1.84 markus 1867:
1868: n = MAX(*maxfdp, channel_max_fd);
1869:
1.243 djm 1870: nfdset = howmany(n+1, NFDBITS);
1871: /* Explicitly test here, because xrealloc isn't always called */
1872: if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask))
1873: fatal("channel_prepare_select: max_fd (%d) is too large", n);
1874: sz = nfdset * sizeof(fd_mask);
1875:
1.132 markus 1876: /* perhaps check sz < nalloc/2 and shrink? */
1877: if (*readsetp == NULL || sz > *nallocp) {
1.243 djm 1878: *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask));
1879: *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask));
1.132 markus 1880: *nallocp = sz;
1.84 markus 1881: }
1.132 markus 1882: *maxfdp = n;
1.84 markus 1883: memset(*readsetp, 0, sz);
1884: memset(*writesetp, 0, sz);
1885:
1.100 markus 1886: if (!rekeying)
1887: channel_handler(channel_pre, *readsetp, *writesetp);
1.41 markus 1888: }
1889:
1.121 markus 1890: /*
1891: * After select, perform any appropriate operations for channels which have
1892: * events pending.
1893: */
1.49 markus 1894: void
1.237 deraadt 1895: channel_after_select(fd_set *readset, fd_set *writeset)
1.41 markus 1896: {
1897: channel_handler(channel_post, readset, writeset);
1898: }
1899:
1.121 markus 1900:
1.84 markus 1901: /* If there is data to send to the connection, enqueue some of it now. */
1.49 markus 1902: void
1.142 itojun 1903: channel_output_poll(void)
1.1 deraadt 1904: {
1.41 markus 1905: Channel *c;
1.209 avsm 1906: u_int i, len;
1.1 deraadt 1907:
1.25 markus 1908: for (i = 0; i < channels_alloc; i++) {
1.113 markus 1909: c = channels[i];
1910: if (c == NULL)
1911: continue;
1.37 markus 1912:
1.121 markus 1913: /*
1914: * We are only interested in channels that can have buffered
1915: * incoming data.
1916: */
1.37 markus 1917: if (compat13) {
1.41 markus 1918: if (c->type != SSH_CHANNEL_OPEN &&
1919: c->type != SSH_CHANNEL_INPUT_DRAINING)
1.37 markus 1920: continue;
1921: } else {
1.41 markus 1922: if (c->type != SSH_CHANNEL_OPEN)
1.37 markus 1923: continue;
1924: }
1.46 markus 1925: if (compat20 &&
1926: (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
1.93 markus 1927: /* XXX is this true? */
1.140 markus 1928: debug3("channel %d: will not send data after close", c->self);
1.44 markus 1929: continue;
1930: }
1.25 markus 1931:
1932: /* Get the amount of buffered data for this channel. */
1.93 markus 1933: if ((c->istate == CHAN_INPUT_OPEN ||
1934: c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1935: (len = buffer_len(&c->input)) > 0) {
1.228 reyk 1936: if (c->datagram) {
1937: if (len > 0) {
1938: u_char *data;
1939: u_int dlen;
1940:
1941: data = buffer_get_string(&c->input,
1942: &dlen);
1943: packet_start(SSH2_MSG_CHANNEL_DATA);
1944: packet_put_int(c->remote_id);
1945: packet_put_string(data, dlen);
1946: packet_send();
1947: c->remote_window -= dlen + 4;
1948: xfree(data);
1949: }
1950: continue;
1951: }
1.121 markus 1952: /*
1953: * Send some data for the other side over the secure
1954: * connection.
1955: */
1.44 markus 1956: if (compat20) {
1957: if (len > c->remote_window)
1958: len = c->remote_window;
1959: if (len > c->remote_maxpacket)
1960: len = c->remote_maxpacket;
1.25 markus 1961: } else {
1.44 markus 1962: if (packet_is_interactive()) {
1963: if (len > 1024)
1964: len = 512;
1965: } else {
1966: /* Keep the packets at reasonable size. */
1967: if (len > packet_get_maxsize()/2)
1968: len = packet_get_maxsize()/2;
1969: }
1.25 markus 1970: }
1.41 markus 1971: if (len > 0) {
1.44 markus 1972: packet_start(compat20 ?
1973: SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
1.41 markus 1974: packet_put_int(c->remote_id);
1975: packet_put_string(buffer_ptr(&c->input), len);
1976: packet_send();
1977: buffer_consume(&c->input, len);
1978: c->remote_window -= len;
1979: }
1980: } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
1.25 markus 1981: if (compat13)
1982: fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
1.27 markus 1983: /*
1984: * input-buffer is empty and read-socket shutdown:
1.172 markus 1985: * tell peer, that we will not send more data: send IEOF.
1986: * hack for extended data: delay EOF if EFD still in use.
1.27 markus 1987: */
1.172 markus 1988: if (CHANNEL_EFD_INPUT_ACTIVE(c))
1.223 djm 1989: debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
1990: c->self, c->efd, buffer_len(&c->extended));
1.172 markus 1991: else
1992: chan_ibuf_empty(c);
1.25 markus 1993: }
1.44 markus 1994: /* Send extended data, i.e. stderr */
1995: if (compat20 &&
1.172 markus 1996: !(c->flags & CHAN_EOF_SENT) &&
1.44 markus 1997: c->remote_window > 0 &&
1998: (len = buffer_len(&c->extended)) > 0 &&
1999: c->extended_usage == CHAN_EXTENDED_READ) {
1.178 markus 2000: debug2("channel %d: rwin %u elen %u euse %d",
1.93 markus 2001: c->self, c->remote_window, buffer_len(&c->extended),
2002: c->extended_usage);
1.44 markus 2003: if (len > c->remote_window)
2004: len = c->remote_window;
2005: if (len > c->remote_maxpacket)
2006: len = c->remote_maxpacket;
2007: packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
2008: packet_put_int(c->remote_id);
2009: packet_put_int(SSH2_EXTENDED_DATA_STDERR);
2010: packet_put_string(buffer_ptr(&c->extended), len);
2011: packet_send();
2012: buffer_consume(&c->extended, len);
2013: c->remote_window -= len;
1.93 markus 2014: debug2("channel %d: sent ext data %d", c->self, len);
1.44 markus 2015: }
1.25 markus 2016: }
1.1 deraadt 2017: }
2018:
1.121 markus 2019:
2020: /* -- protocol input */
1.249 djm 2021:
2022: /* ARGSUSED */
1.49 markus 2023: void
1.154 markus 2024: channel_input_data(int type, u_int32_t seq, void *ctxt)
1.1 deraadt 2025: {
1.37 markus 2026: int id;
1.25 markus 2027: char *data;
1.77 markus 2028: u_int data_len;
1.41 markus 2029: Channel *c;
1.25 markus 2030:
2031: /* Get the channel number and verify it. */
1.37 markus 2032: id = packet_get_int();
1.41 markus 2033: c = channel_lookup(id);
2034: if (c == NULL)
1.37 markus 2035: packet_disconnect("Received data for nonexistent channel %d.", id);
1.25 markus 2036:
2037: /* Ignore any data for non-open channels (might happen on close) */
1.41 markus 2038: if (c->type != SSH_CHANNEL_OPEN &&
2039: c->type != SSH_CHANNEL_X11_OPEN)
1.37 markus 2040: return;
2041:
1.25 markus 2042: /* Get the data. */
1.274 markus 2043: data = packet_get_string_ptr(&data_len);
1.200 markus 2044:
2045: /*
2046: * Ignore data for protocol > 1.3 if output end is no longer open.
2047: * For protocol 2 the sending side is reducing its window as it sends
2048: * data, so we must 'fake' consumption of the data in order to ensure
2049: * that window updates are sent back. Otherwise the connection might
2050: * deadlock.
2051: */
2052: if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) {
2053: if (compat20) {
2054: c->local_window -= data_len;
2055: c->local_consumed += data_len;
2056: }
2057: return;
2058: }
1.41 markus 2059:
1.143 deraadt 2060: if (compat20) {
1.44 markus 2061: if (data_len > c->local_maxpacket) {
1.188 itojun 2062: logit("channel %d: rcvd big packet %d, maxpack %d",
1.44 markus 2063: c->self, data_len, c->local_maxpacket);
2064: }
2065: if (data_len > c->local_window) {
1.188 itojun 2066: logit("channel %d: rcvd too much data %d, win %d",
1.44 markus 2067: c->self, data_len, c->local_window);
2068: return;
2069: }
2070: c->local_window -= data_len;
2071: }
1.228 reyk 2072: if (c->datagram)
2073: buffer_put_string(&c->output, data, data_len);
2074: else
2075: buffer_append(&c->output, data, data_len);
1.274 markus 2076: packet_check_eom();
1.1 deraadt 2077: }
1.121 markus 2078:
1.249 djm 2079: /* ARGSUSED */
1.49 markus 2080: void
1.154 markus 2081: channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
1.44 markus 2082: {
2083: int id;
2084: char *data;
1.177 markus 2085: u_int data_len, tcode;
1.44 markus 2086: Channel *c;
2087:
2088: /* Get the channel number and verify it. */
2089: id = packet_get_int();
2090: c = channel_lookup(id);
2091:
2092: if (c == NULL)
2093: packet_disconnect("Received extended_data for bad channel %d.", id);
2094: if (c->type != SSH_CHANNEL_OPEN) {
1.188 itojun 2095: logit("channel %d: ext data for non open", id);
1.44 markus 2096: return;
1.172 markus 2097: }
2098: if (c->flags & CHAN_EOF_RCVD) {
2099: if (datafellows & SSH_BUG_EXTEOF)
2100: debug("channel %d: accepting ext data after eof", id);
2101: else
2102: packet_disconnect("Received extended_data after EOF "
2103: "on channel %d.", id);
1.44 markus 2104: }
2105: tcode = packet_get_int();
2106: if (c->efd == -1 ||
2107: c->extended_usage != CHAN_EXTENDED_WRITE ||
2108: tcode != SSH2_EXTENDED_DATA_STDERR) {
1.188 itojun 2109: logit("channel %d: bad ext data", c->self);
1.44 markus 2110: return;
2111: }
2112: data = packet_get_string(&data_len);
1.152 markus 2113: packet_check_eom();
1.44 markus 2114: if (data_len > c->local_window) {
1.188 itojun 2115: logit("channel %d: rcvd too much extended_data %d, win %d",
1.44 markus 2116: c->self, data_len, c->local_window);
2117: xfree(data);
2118: return;
2119: }
1.70 markus 2120: debug2("channel %d: rcvd ext data %d", c->self, data_len);
1.44 markus 2121: c->local_window -= data_len;
2122: buffer_append(&c->extended, data, data_len);
2123: xfree(data);
2124: }
2125:
1.249 djm 2126: /* ARGSUSED */
1.49 markus 2127: void
1.154 markus 2128: channel_input_ieof(int type, u_int32_t seq, void *ctxt)
1.41 markus 2129: {
2130: int id;
2131: Channel *c;
2132:
2133: id = packet_get_int();
1.152 markus 2134: packet_check_eom();
1.41 markus 2135: c = channel_lookup(id);
2136: if (c == NULL)
2137: packet_disconnect("Received ieof for nonexistent channel %d.", id);
2138: chan_rcvd_ieof(c);
1.133 markus 2139:
2140: /* XXX force input close */
1.156 markus 2141: if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
1.133 markus 2142: debug("channel %d: FORCE input drain", c->self);
2143: c->istate = CHAN_INPUT_WAIT_DRAIN;
1.161 markus 2144: if (buffer_len(&c->input) == 0)
2145: chan_ibuf_empty(c);
1.133 markus 2146: }
2147:
1.41 markus 2148: }
1.1 deraadt 2149:
1.249 djm 2150: /* ARGSUSED */
1.49 markus 2151: void
1.154 markus 2152: channel_input_close(int type, u_int32_t seq, void *ctxt)
1.1 deraadt 2153: {
1.41 markus 2154: int id;
2155: Channel *c;
1.1 deraadt 2156:
1.41 markus 2157: id = packet_get_int();
1.152 markus 2158: packet_check_eom();
1.41 markus 2159: c = channel_lookup(id);
2160: if (c == NULL)
2161: packet_disconnect("Received close for nonexistent channel %d.", id);
1.27 markus 2162:
2163: /*
2164: * Send a confirmation that we have closed the channel and no more
2165: * data is coming for it.
2166: */
1.25 markus 2167: packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
1.41 markus 2168: packet_put_int(c->remote_id);
1.25 markus 2169: packet_send();
2170:
1.27 markus 2171: /*
2172: * If the channel is in closed state, we have sent a close request,
2173: * and the other side will eventually respond with a confirmation.
2174: * Thus, we cannot free the channel here, because then there would be
2175: * no-one to receive the confirmation. The channel gets freed when
2176: * the confirmation arrives.
2177: */
1.41 markus 2178: if (c->type != SSH_CHANNEL_CLOSED) {
1.27 markus 2179: /*
2180: * Not a closed channel - mark it as draining, which will
2181: * cause it to be freed later.
2182: */
1.158 markus 2183: buffer_clear(&c->input);
1.41 markus 2184: c->type = SSH_CHANNEL_OUTPUT_DRAINING;
1.25 markus 2185: }
1.1 deraadt 2186: }
2187:
1.41 markus 2188: /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
1.249 djm 2189: /* ARGSUSED */
1.49 markus 2190: void
1.154 markus 2191: channel_input_oclose(int type, u_int32_t seq, void *ctxt)
1.41 markus 2192: {
2193: int id = packet_get_int();
2194: Channel *c = channel_lookup(id);
1.151 markus 2195:
1.152 markus 2196: packet_check_eom();
1.41 markus 2197: if (c == NULL)
2198: packet_disconnect("Received oclose for nonexistent channel %d.", id);
2199: chan_rcvd_oclose(c);
2200: }
1.1 deraadt 2201:
1.249 djm 2202: /* ARGSUSED */
1.49 markus 2203: void
1.154 markus 2204: channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
1.1 deraadt 2205: {
1.41 markus 2206: int id = packet_get_int();
2207: Channel *c = channel_lookup(id);
1.1 deraadt 2208:
1.152 markus 2209: packet_check_eom();
1.41 markus 2210: if (c == NULL)
2211: packet_disconnect("Received close confirmation for "
2212: "out-of-range channel %d.", id);
2213: if (c->type != SSH_CHANNEL_CLOSED)
2214: packet_disconnect("Received close confirmation for "
2215: "non-closed channel %d (type %d).", id, c->type);
1.113 markus 2216: channel_free(c);
1.1 deraadt 2217: }
2218:
1.249 djm 2219: /* ARGSUSED */
1.49 markus 2220: void
1.154 markus 2221: channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
1.1 deraadt 2222: {
1.41 markus 2223: int id, remote_id;
2224: Channel *c;
1.1 deraadt 2225:
1.41 markus 2226: id = packet_get_int();
2227: c = channel_lookup(id);
1.25 markus 2228:
1.41 markus 2229: if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2230: packet_disconnect("Received open confirmation for "
2231: "non-opening channel %d.", id);
2232: remote_id = packet_get_int();
1.27 markus 2233: /* Record the remote channel number and mark that the channel is now open. */
1.41 markus 2234: c->remote_id = remote_id;
2235: c->type = SSH_CHANNEL_OPEN;
1.44 markus 2236:
2237: if (compat20) {
2238: c->remote_window = packet_get_int();
2239: c->remote_maxpacket = packet_get_int();
1.275 djm 2240: if (c->open_confirm) {
1.70 markus 2241: debug2("callback start");
1.275 djm 2242: c->open_confirm(c->self, c->open_confirm_ctx);
1.70 markus 2243: debug2("callback done");
1.44 markus 2244: }
1.194 markus 2245: debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
1.44 markus 2246: c->remote_window, c->remote_maxpacket);
2247: }
1.152 markus 2248: packet_check_eom();
1.1 deraadt 2249: }
2250:
1.127 itojun 2251: static char *
1.114 markus 2252: reason2txt(int reason)
2253: {
1.143 deraadt 2254: switch (reason) {
1.114 markus 2255: case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
2256: return "administratively prohibited";
2257: case SSH2_OPEN_CONNECT_FAILED:
2258: return "connect failed";
2259: case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
2260: return "unknown channel type";
2261: case SSH2_OPEN_RESOURCE_SHORTAGE:
2262: return "resource shortage";
2263: }
1.117 stevesk 2264: return "unknown reason";
1.114 markus 2265: }
2266:
1.249 djm 2267: /* ARGSUSED */
1.49 markus 2268: void
1.154 markus 2269: channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
1.1 deraadt 2270: {
1.86 markus 2271: int id, reason;
2272: char *msg = NULL, *lang = NULL;
1.41 markus 2273: Channel *c;
2274:
2275: id = packet_get_int();
2276: c = channel_lookup(id);
1.25 markus 2277:
1.41 markus 2278: if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2279: packet_disconnect("Received open failure for "
2280: "non-opening channel %d.", id);
1.44 markus 2281: if (compat20) {
1.86 markus 2282: reason = packet_get_int();
1.110 markus 2283: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.86 markus 2284: msg = packet_get_string(NULL);
2285: lang = packet_get_string(NULL);
2286: }
1.188 itojun 2287: logit("channel %d: open failed: %s%s%s", id,
1.114 markus 2288: reason2txt(reason), msg ? ": ": "", msg ? msg : "");
1.86 markus 2289: if (msg != NULL)
2290: xfree(msg);
2291: if (lang != NULL)
2292: xfree(lang);
1.44 markus 2293: }
1.152 markus 2294: packet_check_eom();
1.25 markus 2295: /* Free the channel. This will also close the socket. */
1.113 markus 2296: channel_free(c);
1.44 markus 2297: }
2298:
1.249 djm 2299: /* ARGSUSED */
1.121 markus 2300: void
1.154 markus 2301: channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
1.121 markus 2302: {
2303: Channel *c;
1.178 markus 2304: int id;
2305: u_int adjust;
1.121 markus 2306:
2307: if (!compat20)
2308: return;
2309:
2310: /* Get the channel number and verify it. */
2311: id = packet_get_int();
2312: c = channel_lookup(id);
1.1 deraadt 2313:
1.229 markus 2314: if (c == NULL) {
2315: logit("Received window adjust for non-open channel %d.", id);
1.121 markus 2316: return;
2317: }
2318: adjust = packet_get_int();
1.152 markus 2319: packet_check_eom();
1.178 markus 2320: debug2("channel %d: rcvd adjust %u", id, adjust);
1.121 markus 2321: c->remote_window += adjust;
2322: }
1.1 deraadt 2323:
1.249 djm 2324: /* ARGSUSED */
1.121 markus 2325: void
1.154 markus 2326: channel_input_port_open(int type, u_int32_t seq, void *ctxt)
1.1 deraadt 2327: {
1.121 markus 2328: Channel *c = NULL;
2329: u_short host_port;
2330: char *host, *originator_string;
1.276 djm 2331: int remote_id;
1.121 markus 2332:
2333: remote_id = packet_get_int();
2334: host = packet_get_string(NULL);
2335: host_port = packet_get_int();
1.25 markus 2336:
1.121 markus 2337: if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2338: originator_string = packet_get_string(NULL);
2339: } else {
2340: originator_string = xstrdup("unknown (remote did not supply name)");
2341: }
1.152 markus 2342: packet_check_eom();
1.276 djm 2343: c = channel_connect_to(host, host_port,
2344: "connected socket", originator_string);
1.190 markus 2345: xfree(originator_string);
1.276 djm 2346: xfree(host);
1.121 markus 2347: if (c == NULL) {
2348: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2349: packet_put_int(remote_id);
2350: packet_send();
1.276 djm 2351: } else
2352: c->remote_id = remote_id;
1.1 deraadt 2353: }
2354:
1.275 djm 2355: /* ARGSUSED */
2356: void
2357: channel_input_status_confirm(int type, u_int32_t seq, void *ctxt)
2358: {
2359: Channel *c;
2360: struct channel_confirm *cc;
2361: int remote_id;
2362:
2363: /* Reset keepalive timeout */
2364: keep_alive_timeouts = 0;
2365:
2366: remote_id = packet_get_int();
2367: packet_check_eom();
2368:
2369: debug2("channel_input_confirm: type %d id %d", type, remote_id);
2370:
2371: if ((c = channel_lookup(remote_id)) == NULL) {
2372: logit("channel_input_success_failure: %d: unknown", remote_id);
2373: return;
2374: }
2375: ;
2376: if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL)
2377: return;
2378: cc->cb(type, c, cc->ctx);
2379: TAILQ_REMOVE(&c->status_confirms, cc, entry);
2380: bzero(cc, sizeof(*cc));
2381: xfree(cc);
2382: }
1.121 markus 2383:
2384: /* -- tcp forwarding */
1.135 markus 2385:
2386: void
2387: channel_set_af(int af)
2388: {
2389: IPv4or6 = af;
2390: }
1.121 markus 2391:
1.160 markus 2392: static int
2393: channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port,
2394: const char *host_to_connect, u_short port_to_connect, int gateway_ports)
1.25 markus 2395: {
1.113 markus 2396: Channel *c;
1.226 djm 2397: int sock, r, success = 0, wildcard = 0, is_client;
1.35 markus 2398: struct addrinfo hints, *ai, *aitop;
1.212 djm 2399: const char *host, *addr;
1.35 markus 2400: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
1.25 markus 2401:
1.160 markus 2402: host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2403: listen_addr : host_to_connect;
1.212 djm 2404: is_client = (type == SSH_CHANNEL_PORT_LISTENER);
1.87 markus 2405:
1.160 markus 2406: if (host == NULL) {
2407: error("No forward host name.");
1.218 markus 2408: return 0;
1.73 markus 2409: }
1.113 markus 2410: if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
1.87 markus 2411: error("Forward host name too long.");
1.218 markus 2412: return 0;
1.87 markus 2413: }
1.25 markus 2414:
1.28 markus 2415: /*
1.212 djm 2416: * Determine whether or not a port forward listens to loopback,
1.213 deraadt 2417: * specified address or wildcard. On the client, a specified bind
2418: * address will always override gateway_ports. On the server, a
2419: * gateway_ports of 1 (``yes'') will override the client's
2420: * specification and force a wildcard bind, whereas a value of 2
2421: * (``clientspecified'') will bind to whatever address the client
1.212 djm 2422: * asked for.
2423: *
2424: * Special-case listen_addrs are:
2425: *
2426: * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR
2427: * "" (empty string), "*" -> wildcard v4/v6
2428: * "localhost" -> loopback v4/v6
2429: */
2430: addr = NULL;
2431: if (listen_addr == NULL) {
2432: /* No address specified: default to gateway_ports setting */
2433: if (gateway_ports)
2434: wildcard = 1;
2435: } else if (gateway_ports || is_client) {
2436: if (((datafellows & SSH_OLD_FORWARD_ADDR) &&
1.272 djm 2437: strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) ||
1.212 djm 2438: *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 ||
2439: (!is_client && gateway_ports == 1))
2440: wildcard = 1;
2441: else if (strcmp(listen_addr, "localhost") != 0)
2442: addr = listen_addr;
2443: }
2444:
2445: debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s",
2446: type, wildcard, (addr == NULL) ? "NULL" : addr);
2447:
2448: /*
1.35 markus 2449: * getaddrinfo returns a loopback address if the hostname is
2450: * set to NULL and hints.ai_flags is not AI_PASSIVE
1.28 markus 2451: */
1.35 markus 2452: memset(&hints, 0, sizeof(hints));
2453: hints.ai_family = IPv4or6;
1.212 djm 2454: hints.ai_flags = wildcard ? AI_PASSIVE : 0;
1.35 markus 2455: hints.ai_socktype = SOCK_STREAM;
1.73 markus 2456: snprintf(strport, sizeof strport, "%d", listen_port);
1.212 djm 2457: if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) {
2458: if (addr == NULL) {
2459: /* This really shouldn't happen */
2460: packet_disconnect("getaddrinfo: fatal error: %s",
1.271 dtucker 2461: ssh_gai_strerror(r));
1.212 djm 2462: } else {
1.218 markus 2463: error("channel_setup_fwd_listener: "
1.271 dtucker 2464: "getaddrinfo(%.64s): %s", addr,
2465: ssh_gai_strerror(r));
1.212 djm 2466: }
1.218 markus 2467: return 0;
1.212 djm 2468: }
1.35 markus 2469:
2470: for (ai = aitop; ai; ai = ai->ai_next) {
2471: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2472: continue;
2473: if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2474: strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1.160 markus 2475: error("channel_setup_fwd_listener: getnameinfo failed");
1.35 markus 2476: continue;
2477: }
2478: /* Create a port to listen for the host. */
1.189 markus 2479: sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.35 markus 2480: if (sock < 0) {
2481: /* this is no error since kernel may not support ipv6 */
2482: verbose("socket: %.100s", strerror(errno));
2483: continue;
2484: }
1.226 djm 2485:
2486: channel_set_reuseaddr(sock);
1.182 stevesk 2487:
1.35 markus 2488: debug("Local forwarding listening on %s port %s.", ntop, strport);
2489:
2490: /* Bind the socket to the address. */
2491: if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2492: /* address can be in use ipv6 address is already bound */
2493: verbose("bind: %.100s", strerror(errno));
2494: close(sock);
2495: continue;
2496: }
2497: /* Start listening for connections on the socket. */
1.199 markus 2498: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.35 markus 2499: error("listen: %.100s", strerror(errno));
2500: close(sock);
2501: continue;
2502: }
2503: /* Allocate a channel number for the socket. */
1.121 markus 2504: c = channel_new("port listener", type, sock, sock, -1,
1.51 markus 2505: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1.190 markus 2506: 0, "port listener", 1);
1.113 markus 2507: strlcpy(c->path, host, sizeof(c->path));
2508: c->host_port = port_to_connect;
2509: c->listening_port = listen_port;
1.35 markus 2510: success = 1;
2511: }
2512: if (success == 0)
1.160 markus 2513: error("channel_setup_fwd_listener: cannot listen to port: %d",
1.87 markus 2514: listen_port);
1.35 markus 2515: freeaddrinfo(aitop);
1.87 markus 2516: return success;
1.25 markus 2517: }
1.1 deraadt 2518:
1.202 djm 2519: int
2520: channel_cancel_rport_listener(const char *host, u_short port)
2521: {
1.209 avsm 2522: u_int i;
2523: int found = 0;
1.202 djm 2524:
1.213 deraadt 2525: for (i = 0; i < channels_alloc; i++) {
1.202 djm 2526: Channel *c = channels[i];
2527:
2528: if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER &&
2529: strncmp(c->path, host, sizeof(c->path)) == 0 &&
1.208 deraadt 2530: c->listening_port == port) {
1.210 djm 2531: debug2("%s: close channel %d", __func__, i);
1.202 djm 2532: channel_free(c);
2533: found = 1;
2534: }
2535: }
2536:
2537: return (found);
2538: }
2539:
1.160 markus 2540: /* protocol local port fwd, used by ssh (and sshd in v1) */
2541: int
1.212 djm 2542: channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port,
1.160 markus 2543: const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2544: {
2545: return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
1.212 djm 2546: listen_host, listen_port, host_to_connect, port_to_connect,
2547: gateway_ports);
1.160 markus 2548: }
2549:
2550: /* protocol v2 remote port fwd, used by sshd */
2551: int
2552: channel_setup_remote_fwd_listener(const char *listen_address,
2553: u_short listen_port, int gateway_ports)
2554: {
2555: return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
2556: listen_address, listen_port, NULL, 0, gateway_ports);
2557: }
2558:
1.27 markus 2559: /*
2560: * Initiate forwarding of connections to port "port" on remote host through
2561: * the secure channel to host:port from local side.
2562: */
1.1 deraadt 2563:
1.253 markus 2564: int
1.212 djm 2565: channel_request_remote_forwarding(const char *listen_host, u_short listen_port,
1.73 markus 2566: const char *host_to_connect, u_short port_to_connect)
1.25 markus 2567: {
1.153 markus 2568: int type, success = 0;
1.73 markus 2569:
1.25 markus 2570: /* Record locally that connection to this host/port is permitted. */
2571: if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2572: fatal("channel_request_remote_forwarding: too many forwards");
2573:
2574: /* Send the forward request to the remote side. */
1.44 markus 2575: if (compat20) {
1.212 djm 2576: const char *address_to_bind;
1.267 djm 2577: if (listen_host == NULL) {
2578: if (datafellows & SSH_BUG_RFWD_ADDR)
2579: address_to_bind = "127.0.0.1";
2580: else
2581: address_to_bind = "localhost";
2582: } else if (*listen_host == '\0' ||
2583: strcmp(listen_host, "*") == 0) {
2584: if (datafellows & SSH_BUG_RFWD_ADDR)
2585: address_to_bind = "0.0.0.0";
2586: else
2587: address_to_bind = "";
2588: } else
1.212 djm 2589: address_to_bind = listen_host;
2590:
1.44 markus 2591: packet_start(SSH2_MSG_GLOBAL_REQUEST);
2592: packet_put_cstring("tcpip-forward");
1.173 markus 2593: packet_put_char(1); /* boolean: want reply */
1.44 markus 2594: packet_put_cstring(address_to_bind);
2595: packet_put_int(listen_port);
1.73 markus 2596: packet_send();
2597: packet_write_wait();
2598: /* Assume that server accepts the request */
2599: success = 1;
1.44 markus 2600: } else {
2601: packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
1.50 markus 2602: packet_put_int(listen_port);
2603: packet_put_cstring(host_to_connect);
1.44 markus 2604: packet_put_int(port_to_connect);
2605: packet_send();
2606: packet_write_wait();
1.73 markus 2607:
2608: /* Wait for response from the remote side. */
1.153 markus 2609: type = packet_read();
1.73 markus 2610: switch (type) {
2611: case SSH_SMSG_SUCCESS:
2612: success = 1;
2613: break;
2614: case SSH_SMSG_FAILURE:
2615: break;
2616: default:
2617: /* Unknown packet */
2618: packet_disconnect("Protocol error for port forward request:"
2619: "received packet type %d.", type);
2620: }
2621: }
2622: if (success) {
2623: permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2624: permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2625: permitted_opens[num_permitted_opens].listen_port = listen_port;
2626: num_permitted_opens++;
1.44 markus 2627: }
1.253 markus 2628: return (success ? 0 : -1);
1.1 deraadt 2629: }
2630:
1.27 markus 2631: /*
1.208 deraadt 2632: * Request cancellation of remote forwarding of connection host:port from
1.202 djm 2633: * local side.
2634: */
2635: void
1.212 djm 2636: channel_request_rforward_cancel(const char *host, u_short port)
1.202 djm 2637: {
2638: int i;
2639:
2640: if (!compat20)
2641: return;
2642:
2643: for (i = 0; i < num_permitted_opens; i++) {
1.208 deraadt 2644: if (permitted_opens[i].host_to_connect != NULL &&
1.202 djm 2645: permitted_opens[i].listen_port == port)
2646: break;
2647: }
2648: if (i >= num_permitted_opens) {
2649: debug("%s: requested forward not found", __func__);
2650: return;
2651: }
2652: packet_start(SSH2_MSG_GLOBAL_REQUEST);
2653: packet_put_cstring("cancel-tcpip-forward");
2654: packet_put_char(0);
1.212 djm 2655: packet_put_cstring(host == NULL ? "" : host);
1.202 djm 2656: packet_put_int(port);
2657: packet_send();
2658:
2659: permitted_opens[i].listen_port = 0;
2660: permitted_opens[i].port_to_connect = 0;
1.227 stevesk 2661: xfree(permitted_opens[i].host_to_connect);
1.202 djm 2662: permitted_opens[i].host_to_connect = NULL;
2663: }
2664:
2665: /*
1.27 markus 2666: * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2667: * listening for the port, and sends back a success reply (or disconnect
1.253 markus 2668: * message if there was an error).
1.27 markus 2669: */
1.253 markus 2670: int
1.56 markus 2671: channel_input_port_forward_request(int is_root, int gateway_ports)
1.1 deraadt 2672: {
1.31 markus 2673: u_short port, host_port;
1.253 markus 2674: int success = 0;
1.25 markus 2675: char *hostname;
1.1 deraadt 2676:
1.25 markus 2677: /* Get arguments from the packet. */
2678: port = packet_get_int();
2679: hostname = packet_get_string(NULL);
2680: host_port = packet_get_int();
2681:
1.27 markus 2682: /*
2683: * Check that an unprivileged user is not trying to forward a
2684: * privileged port.
2685: */
1.25 markus 2686: if (port < IPPORT_RESERVED && !is_root)
1.192 markus 2687: packet_disconnect(
2688: "Requested forwarding of port %d but user is not root.",
2689: port);
2690: if (host_port == 0)
2691: packet_disconnect("Dynamic forwarding denied.");
2692:
1.73 markus 2693: /* Initiate forwarding */
1.253 markus 2694: success = channel_setup_local_fwd_listener(NULL, port, hostname,
1.212 djm 2695: host_port, gateway_ports);
1.25 markus 2696:
2697: /* Free the argument string. */
2698: xfree(hostname);
1.253 markus 2699:
2700: return (success ? 0 : -1);
1.1 deraadt 2701: }
2702:
1.99 markus 2703: /*
2704: * Permits opening to any host/port if permitted_opens[] is empty. This is
2705: * usually called by the server, because the user could connect to any port
2706: * anyway, and the server has no way to know but to trust the client anyway.
2707: */
2708: void
1.142 itojun 2709: channel_permit_all_opens(void)
1.99 markus 2710: {
2711: if (num_permitted_opens == 0)
2712: all_opens_permitted = 1;
2713: }
2714:
1.101 markus 2715: void
1.99 markus 2716: channel_add_permitted_opens(char *host, int port)
2717: {
2718: if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
1.253 markus 2719: fatal("channel_add_permitted_opens: too many forwards");
1.99 markus 2720: debug("allow port forwarding to host %s port %d", host, port);
2721:
2722: permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2723: permitted_opens[num_permitted_opens].port_to_connect = port;
2724: num_permitted_opens++;
2725:
2726: all_opens_permitted = 0;
2727: }
2728:
1.258 dtucker 2729: int
1.257 dtucker 2730: channel_add_adm_permitted_opens(char *host, int port)
2731: {
2732: if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2733: fatal("channel_add_adm_permitted_opens: too many forwards");
1.258 dtucker 2734: debug("config allows port forwarding to host %s port %d", host, port);
1.257 dtucker 2735:
2736: permitted_adm_opens[num_adm_permitted_opens].host_to_connect
2737: = xstrdup(host);
2738: permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port;
1.258 dtucker 2739: return ++num_adm_permitted_opens;
1.257 dtucker 2740: }
2741:
2742: void
1.99 markus 2743: channel_clear_permitted_opens(void)
2744: {
2745: int i;
2746:
2747: for (i = 0; i < num_permitted_opens; i++)
1.202 djm 2748: if (permitted_opens[i].host_to_connect != NULL)
2749: xfree(permitted_opens[i].host_to_connect);
1.99 markus 2750: num_permitted_opens = 0;
1.257 dtucker 2751: }
2752:
2753: void
2754: channel_clear_adm_permitted_opens(void)
2755: {
2756: int i;
1.99 markus 2757:
1.257 dtucker 2758: for (i = 0; i < num_adm_permitted_opens; i++)
2759: if (permitted_adm_opens[i].host_to_connect != NULL)
2760: xfree(permitted_adm_opens[i].host_to_connect);
2761: num_adm_permitted_opens = 0;
1.278 ! dtucker 2762: }
! 2763:
! 2764: void
! 2765: channel_print_adm_permitted_opens(void)
! 2766: {
! 2767: static int i;
! 2768:
! 2769: for (i = 0; i < num_adm_permitted_opens; i++)
! 2770: if (permitted_adm_opens[i].host_to_connect != NULL)
! 2771: printf(" %s:%d", permitted_adm_opens[i].host_to_connect,
! 2772: permitted_adm_opens[i].port_to_connect);
1.99 markus 2773: }
2774:
1.276 djm 2775: /* Try to start non-blocking connect to next host in cctx list */
1.127 itojun 2776: static int
1.276 djm 2777: connect_next(struct channel_connect *cctx)
1.41 markus 2778: {
1.276 djm 2779: int sock, saved_errno;
1.41 markus 2780: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2781:
1.276 djm 2782: for (; cctx->ai; cctx->ai = cctx->ai->ai_next) {
2783: if (cctx->ai->ai_family != AF_INET &&
2784: cctx->ai->ai_family != AF_INET6)
1.41 markus 2785: continue;
1.276 djm 2786: if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen,
2787: ntop, sizeof(ntop), strport, sizeof(strport),
2788: NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
2789: error("connect_next: getnameinfo failed");
1.41 markus 2790: continue;
2791: }
1.276 djm 2792: if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype,
2793: cctx->ai->ai_protocol)) == -1) {
2794: if (cctx->ai->ai_next == NULL)
1.186 djm 2795: error("socket: %.100s", strerror(errno));
2796: else
2797: verbose("socket: %.100s", strerror(errno));
1.41 markus 2798: continue;
2799: }
1.205 djm 2800: if (set_nonblock(sock) == -1)
2801: fatal("%s: set_nonblock(%d)", __func__, sock);
1.276 djm 2802: if (connect(sock, cctx->ai->ai_addr,
2803: cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) {
2804: debug("connect_next: host %.100s ([%.100s]:%s): "
2805: "%.100s", cctx->host, ntop, strport,
1.41 markus 2806: strerror(errno));
1.276 djm 2807: saved_errno = errno;
1.41 markus 2808: close(sock);
1.276 djm 2809: errno = saved_errno;
1.89 stevesk 2810: continue; /* fail -- try next */
1.41 markus 2811: }
1.276 djm 2812: debug("connect_next: host %.100s ([%.100s]:%s) "
2813: "in progress, fd=%d", cctx->host, ntop, strport, sock);
2814: cctx->ai = cctx->ai->ai_next;
2815: set_nodelay(sock);
2816: return sock;
2817: }
2818: return -1;
2819: }
1.41 markus 2820:
1.276 djm 2821: static void
2822: channel_connect_ctx_free(struct channel_connect *cctx)
2823: {
2824: xfree(cctx->host);
2825: if (cctx->aitop)
2826: freeaddrinfo(cctx->aitop);
2827: bzero(cctx, sizeof(*cctx));
2828: cctx->host = NULL;
2829: cctx->ai = cctx->aitop = NULL;
2830: }
2831:
2832: /* Return CONNECTING channel to remote host, port */
2833: static Channel *
2834: connect_to(const char *host, u_short port, char *ctype, char *rname)
2835: {
2836: struct addrinfo hints;
2837: int gaierr;
2838: int sock = -1;
2839: char strport[NI_MAXSERV];
2840: struct channel_connect cctx;
2841: Channel *c;
2842:
2843: memset(&hints, 0, sizeof(hints));
2844: hints.ai_family = IPv4or6;
2845: hints.ai_socktype = SOCK_STREAM;
2846: snprintf(strport, sizeof strport, "%d", port);
2847: if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) {
2848: error("connect_to %.100s: unknown host (%s)", host,
2849: ssh_gai_strerror(gaierr));
2850: return NULL;
1.41 markus 2851: }
1.276 djm 2852:
2853: cctx.host = xstrdup(host);
2854: cctx.port = port;
2855: cctx.ai = cctx.aitop;
2856:
2857: if ((sock = connect_next(&cctx)) == -1) {
2858: error("connect to %.100s port %d failed: %s",
2859: host, port, strerror(errno));
2860: channel_connect_ctx_free(&cctx);
2861: return NULL;
1.41 markus 2862: }
1.276 djm 2863: c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1,
2864: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1);
2865: c->connect_ctx = cctx;
2866: return c;
1.41 markus 2867: }
1.99 markus 2868:
1.276 djm 2869: Channel *
2870: channel_connect_by_listen_address(u_short listen_port, char *ctype, char *rname)
1.73 markus 2871: {
2872: int i;
1.99 markus 2873:
1.276 djm 2874: for (i = 0; i < num_permitted_opens; i++) {
1.202 djm 2875: if (permitted_opens[i].host_to_connect != NULL &&
1.276 djm 2876: permitted_opens[i].listen_port == listen_port) {
1.99 markus 2877: return connect_to(
1.73 markus 2878: permitted_opens[i].host_to_connect,
1.276 djm 2879: permitted_opens[i].port_to_connect, ctype, rname);
2880: }
2881: }
1.74 markus 2882: error("WARNING: Server requests forwarding for unknown listen_port %d",
2883: listen_port);
1.276 djm 2884: return NULL;
1.73 markus 2885: }
2886:
1.99 markus 2887: /* Check if connecting to that port is permitted and connect. */
1.276 djm 2888: Channel *
2889: channel_connect_to(const char *host, u_short port, char *ctype, char *rname)
1.99 markus 2890: {
1.257 dtucker 2891: int i, permit, permit_adm = 1;
1.99 markus 2892:
2893: permit = all_opens_permitted;
2894: if (!permit) {
2895: for (i = 0; i < num_permitted_opens; i++)
1.202 djm 2896: if (permitted_opens[i].host_to_connect != NULL &&
2897: permitted_opens[i].port_to_connect == port &&
1.99 markus 2898: strcmp(permitted_opens[i].host_to_connect, host) == 0)
2899: permit = 1;
1.257 dtucker 2900: }
1.99 markus 2901:
1.257 dtucker 2902: if (num_adm_permitted_opens > 0) {
2903: permit_adm = 0;
2904: for (i = 0; i < num_adm_permitted_opens; i++)
2905: if (permitted_adm_opens[i].host_to_connect != NULL &&
2906: permitted_adm_opens[i].port_to_connect == port &&
2907: strcmp(permitted_adm_opens[i].host_to_connect, host)
2908: == 0)
2909: permit_adm = 1;
1.99 markus 2910: }
1.257 dtucker 2911:
2912: if (!permit || !permit_adm) {
1.188 itojun 2913: logit("Received request to connect to host %.100s port %d, "
1.99 markus 2914: "but the request was denied.", host, port);
1.276 djm 2915: return NULL;
1.99 markus 2916: }
1.276 djm 2917: return connect_to(host, port, ctype, rname);
1.204 djm 2918: }
2919:
2920: void
2921: channel_send_window_changes(void)
2922: {
1.209 avsm 2923: u_int i;
1.204 djm 2924: struct winsize ws;
2925:
2926: for (i = 0; i < channels_alloc; i++) {
1.213 deraadt 2927: if (channels[i] == NULL || !channels[i]->client_tty ||
1.204 djm 2928: channels[i]->type != SSH_CHANNEL_OPEN)
2929: continue;
2930: if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0)
2931: continue;
2932: channel_request_start(i, "window-change", 0);
1.238 deraadt 2933: packet_put_int((u_int)ws.ws_col);
2934: packet_put_int((u_int)ws.ws_row);
2935: packet_put_int((u_int)ws.ws_xpixel);
2936: packet_put_int((u_int)ws.ws_ypixel);
1.204 djm 2937: packet_send();
2938: }
1.99 markus 2939: }
2940:
1.121 markus 2941: /* -- X11 forwarding */
1.1 deraadt 2942:
1.27 markus 2943: /*
2944: * Creates an internet domain socket for listening for X11 connections.
1.176 deraadt 2945: * Returns 0 and a suitable display number for the DISPLAY variable
2946: * stored in display_numberp , or -1 if an error occurs.
1.27 markus 2947: */
1.141 stevesk 2948: int
1.163 stevesk 2949: x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
1.222 djm 2950: int single_connection, u_int *display_numberp, int **chanids)
1.1 deraadt 2951: {
1.149 markus 2952: Channel *nc = NULL;
1.31 markus 2953: int display_number, sock;
2954: u_short port;
1.35 markus 2955: struct addrinfo hints, *ai, *aitop;
2956: char strport[NI_MAXSERV];
2957: int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
1.25 markus 2958:
1.224 markus 2959: if (chanids == NULL)
2960: return -1;
2961:
1.33 markus 2962: for (display_number = x11_display_offset;
1.148 deraadt 2963: display_number < MAX_DISPLAYS;
2964: display_number++) {
1.25 markus 2965: port = 6000 + display_number;
1.35 markus 2966: memset(&hints, 0, sizeof(hints));
2967: hints.ai_family = IPv4or6;
1.163 stevesk 2968: hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
1.35 markus 2969: hints.ai_socktype = SOCK_STREAM;
2970: snprintf(strport, sizeof strport, "%d", port);
2971: if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
1.271 dtucker 2972: error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr));
1.141 stevesk 2973: return -1;
1.25 markus 2974: }
1.35 markus 2975: for (ai = aitop; ai; ai = ai->ai_next) {
2976: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2977: continue;
1.189 markus 2978: sock = socket(ai->ai_family, ai->ai_socktype,
2979: ai->ai_protocol);
1.35 markus 2980: if (sock < 0) {
2981: error("socket: %.100s", strerror(errno));
1.203 markus 2982: freeaddrinfo(aitop);
1.141 stevesk 2983: return -1;
1.35 markus 2984: }
1.226 djm 2985: channel_set_reuseaddr(sock);
1.35 markus 2986: if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1.194 markus 2987: debug2("bind port %d: %.100s", port, strerror(errno));
1.35 markus 2988: close(sock);
1.183 itojun 2989:
1.35 markus 2990: for (n = 0; n < num_socks; n++) {
2991: close(socks[n]);
2992: }
2993: num_socks = 0;
2994: break;
2995: }
2996: socks[num_socks++] = sock;
2997: if (num_socks == NUM_SOCKS)
2998: break;
1.25 markus 2999: }
1.83 stevesk 3000: freeaddrinfo(aitop);
1.35 markus 3001: if (num_socks > 0)
3002: break;
1.25 markus 3003: }
3004: if (display_number >= MAX_DISPLAYS) {
3005: error("Failed to allocate internet-domain X11 display socket.");
1.141 stevesk 3006: return -1;
1.25 markus 3007: }
3008: /* Start listening for connections on the socket. */
1.35 markus 3009: for (n = 0; n < num_socks; n++) {
3010: sock = socks[n];
1.199 markus 3011: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.35 markus 3012: error("listen: %.100s", strerror(errno));
3013: close(sock);
1.141 stevesk 3014: return -1;
1.35 markus 3015: }
1.25 markus 3016: }
1.35 markus 3017:
3018: /* Allocate a channel for each socket. */
1.242 djm 3019: *chanids = xcalloc(num_socks + 1, sizeof(**chanids));
1.35 markus 3020: for (n = 0; n < num_socks; n++) {
3021: sock = socks[n];
1.149 markus 3022: nc = channel_new("x11 listener",
1.51 markus 3023: SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
3024: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.190 markus 3025: 0, "X11 inet listener", 1);
1.167 markus 3026: nc->single_connection = single_connection;
1.224 markus 3027: (*chanids)[n] = nc->self;
1.35 markus 3028: }
1.224 markus 3029: (*chanids)[n] = -1;
1.1 deraadt 3030:
1.141 stevesk 3031: /* Return the display number for the DISPLAY environment variable. */
1.176 deraadt 3032: *display_numberp = display_number;
3033: return (0);
1.1 deraadt 3034: }
3035:
1.127 itojun 3036: static int
1.77 markus 3037: connect_local_xsocket(u_int dnr)
1.1 deraadt 3038: {
1.25 markus 3039: int sock;
3040: struct sockaddr_un addr;
3041:
1.147 stevesk 3042: sock = socket(AF_UNIX, SOCK_STREAM, 0);
3043: if (sock < 0)
3044: error("socket: %.100s", strerror(errno));
3045: memset(&addr, 0, sizeof(addr));
3046: addr.sun_family = AF_UNIX;
3047: snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
1.239 deraadt 3048: if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0)
1.147 stevesk 3049: return sock;
3050: close(sock);
1.25 markus 3051: error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
3052: return -1;
1.1 deraadt 3053: }
3054:
1.51 markus 3055: int
3056: x11_connect_display(void)
1.1 deraadt 3057: {
1.248 deraadt 3058: u_int display_number;
1.25 markus 3059: const char *display;
1.51 markus 3060: char buf[1024], *cp;
1.35 markus 3061: struct addrinfo hints, *ai, *aitop;
3062: char strport[NI_MAXSERV];
1.248 deraadt 3063: int gaierr, sock = 0;
1.25 markus 3064:
3065: /* Try to open a socket for the local X server. */
3066: display = getenv("DISPLAY");
3067: if (!display) {
3068: error("DISPLAY not set.");
1.51 markus 3069: return -1;
1.25 markus 3070: }
1.27 markus 3071: /*
3072: * Now we decode the value of the DISPLAY variable and make a
3073: * connection to the real X server.
3074: */
3075:
3076: /*
3077: * Check if it is a unix domain socket. Unix domain displays are in
3078: * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
3079: */
1.25 markus 3080: if (strncmp(display, "unix:", 5) == 0 ||
3081: display[0] == ':') {
3082: /* Connect to the unix domain socket. */
1.248 deraadt 3083: if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) {
1.25 markus 3084: error("Could not parse display number from DISPLAY: %.100s",
1.148 deraadt 3085: display);
1.51 markus 3086: return -1;
1.25 markus 3087: }
3088: /* Create a socket. */
3089: sock = connect_local_xsocket(display_number);
3090: if (sock < 0)
1.51 markus 3091: return -1;
1.25 markus 3092:
3093: /* OK, we now have a connection to the display. */
1.51 markus 3094: return sock;
1.25 markus 3095: }
1.27 markus 3096: /*
3097: * Connect to an inet socket. The DISPLAY value is supposedly
3098: * hostname:d[.s], where hostname may also be numeric IP address.
3099: */
1.145 stevesk 3100: strlcpy(buf, display, sizeof(buf));
1.25 markus 3101: cp = strchr(buf, ':');
3102: if (!cp) {
3103: error("Could not find ':' in DISPLAY: %.100s", display);
1.51 markus 3104: return -1;
1.25 markus 3105: }
3106: *cp = 0;
1.27 markus 3107: /* buf now contains the host name. But first we parse the display number. */
1.248 deraadt 3108: if (sscanf(cp + 1, "%u", &display_number) != 1) {
1.25 markus 3109: error("Could not parse display number from DISPLAY: %.100s",
1.148 deraadt 3110: display);
1.51 markus 3111: return -1;
1.25 markus 3112: }
1.35 markus 3113:
3114: /* Look up the host address */
3115: memset(&hints, 0, sizeof(hints));
3116: hints.ai_family = IPv4or6;
3117: hints.ai_socktype = SOCK_STREAM;
1.248 deraadt 3118: snprintf(strport, sizeof strport, "%u", 6000 + display_number);
1.35 markus 3119: if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
1.271 dtucker 3120: error("%.100s: unknown host. (%s)", buf,
3121: ssh_gai_strerror(gaierr));
1.51 markus 3122: return -1;
1.25 markus 3123: }
1.35 markus 3124: for (ai = aitop; ai; ai = ai->ai_next) {
3125: /* Create a socket. */
1.189 markus 3126: sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.35 markus 3127: if (sock < 0) {
1.194 markus 3128: debug2("socket: %.100s", strerror(errno));
1.41 markus 3129: continue;
3130: }
3131: /* Connect it to the display. */
3132: if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1.248 deraadt 3133: debug2("connect %.100s port %u: %.100s", buf,
1.41 markus 3134: 6000 + display_number, strerror(errno));
3135: close(sock);
3136: continue;
3137: }
3138: /* Success */
3139: break;
1.35 markus 3140: }
3141: freeaddrinfo(aitop);
3142: if (!ai) {
1.248 deraadt 3143: error("connect %.100s port %u: %.100s", buf, 6000 + display_number,
1.35 markus 3144: strerror(errno));
1.51 markus 3145: return -1;
1.25 markus 3146: }
1.162 stevesk 3147: set_nodelay(sock);
1.51 markus 3148: return sock;
3149: }
3150:
3151: /*
3152: * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
3153: * the remote channel number. We should do whatever we want, and respond
3154: * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
3155: */
3156:
1.259 stevesk 3157: /* ARGSUSED */
1.51 markus 3158: void
1.154 markus 3159: x11_input_open(int type, u_int32_t seq, void *ctxt)
1.51 markus 3160: {
1.113 markus 3161: Channel *c = NULL;
3162: int remote_id, sock = 0;
1.51 markus 3163: char *remote_host;
1.25 markus 3164:
1.113 markus 3165: debug("Received X11 open request.");
1.51 markus 3166:
1.113 markus 3167: remote_id = packet_get_int();
1.121 markus 3168:
3169: if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
1.113 markus 3170: remote_host = packet_get_string(NULL);
1.51 markus 3171: } else {
3172: remote_host = xstrdup("unknown (remote did not supply name)");
3173: }
1.152 markus 3174: packet_check_eom();
1.25 markus 3175:
1.51 markus 3176: /* Obtain a connection to the real X display. */
3177: sock = x11_connect_display();
1.113 markus 3178: if (sock != -1) {
3179: /* Allocate a channel for this connection. */
3180: c = channel_new("connected x11 socket",
3181: SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
3182: remote_host, 1);
1.167 markus 3183: c->remote_id = remote_id;
3184: c->force_drain = 1;
1.113 markus 3185: }
1.190 markus 3186: xfree(remote_host);
1.113 markus 3187: if (c == NULL) {
1.51 markus 3188: /* Send refusal to the remote host. */
3189: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1.113 markus 3190: packet_put_int(remote_id);
1.51 markus 3191: } else {
3192: /* Send a confirmation to the remote host. */
3193: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1.113 markus 3194: packet_put_int(remote_id);
3195: packet_put_int(c->self);
1.51 markus 3196: }
1.113 markus 3197: packet_send();
1.72 markus 3198: }
3199:
3200: /* dummy protocol handler that denies SSH-1 requests (agent/x11) */
1.259 stevesk 3201: /* ARGSUSED */
1.72 markus 3202: void
1.154 markus 3203: deny_input_open(int type, u_int32_t seq, void *ctxt)
1.72 markus 3204: {
3205: int rchan = packet_get_int();
1.180 deraadt 3206:
1.143 deraadt 3207: switch (type) {
1.72 markus 3208: case SSH_SMSG_AGENT_OPEN:
3209: error("Warning: ssh server tried agent forwarding.");
3210: break;
3211: case SSH_SMSG_X11_OPEN:
3212: error("Warning: ssh server tried X11 forwarding.");
3213: break;
3214: default:
1.154 markus 3215: error("deny_input_open: type %d", type);
1.72 markus 3216: break;
3217: }
1.230 stevesk 3218: error("Warning: this is probably a break-in attempt by a malicious server.");
1.72 markus 3219: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
3220: packet_put_int(rchan);
3221: packet_send();
1.1 deraadt 3222: }
3223:
1.27 markus 3224: /*
3225: * Requests forwarding of X11 connections, generates fake authentication
3226: * data, and enables authentication spoofing.
1.121 markus 3227: * This should be called in the client only.
1.27 markus 3228: */
1.49 markus 3229: void
1.215 djm 3230: x11_request_forwarding_with_spoofing(int client_session_id, const char *disp,
1.51 markus 3231: const char *proto, const char *data)
1.1 deraadt 3232: {
1.77 markus 3233: u_int data_len = (u_int) strlen(data) / 2;
1.219 djm 3234: u_int i, value;
1.25 markus 3235: char *new_data;
3236: int screen_number;
3237: const char *cp;
1.207 avsm 3238: u_int32_t rnd = 0;
1.25 markus 3239:
1.220 markus 3240: if (x11_saved_display == NULL)
3241: x11_saved_display = xstrdup(disp);
3242: else if (strcmp(disp, x11_saved_display) != 0) {
1.219 djm 3243: error("x11_request_forwarding_with_spoofing: different "
3244: "$DISPLAY already forwarded");
3245: return;
3246: }
3247:
1.266 djm 3248: cp = strchr(disp, ':');
1.25 markus 3249: if (cp)
3250: cp = strchr(cp, '.');
3251: if (cp)
1.245 deraadt 3252: screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL);
1.25 markus 3253: else
3254: screen_number = 0;
3255:
1.219 djm 3256: if (x11_saved_proto == NULL) {
3257: /* Save protocol name. */
3258: x11_saved_proto = xstrdup(proto);
3259: /*
1.221 djm 3260: * Extract real authentication data and generate fake data
1.219 djm 3261: * of the same length.
3262: */
3263: x11_saved_data = xmalloc(data_len);
3264: x11_fake_data = xmalloc(data_len);
3265: for (i = 0; i < data_len; i++) {
3266: if (sscanf(data + 2 * i, "%2x", &value) != 1)
3267: fatal("x11_request_forwarding: bad "
3268: "authentication data: %.100s", data);
3269: if (i % 4 == 0)
3270: rnd = arc4random();
3271: x11_saved_data[i] = value;
3272: x11_fake_data[i] = rnd & 0xff;
3273: rnd >>= 8;
3274: }
3275: x11_saved_data_len = data_len;
3276: x11_fake_data_len = data_len;
1.25 markus 3277: }
3278:
3279: /* Convert the fake data into hex. */
1.219 djm 3280: new_data = tohex(x11_fake_data, data_len);
1.25 markus 3281:
3282: /* Send the request packet. */
1.51 markus 3283: if (compat20) {
3284: channel_request_start(client_session_id, "x11-req", 0);
3285: packet_put_char(0); /* XXX bool single connection */
3286: } else {
3287: packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
3288: }
3289: packet_put_cstring(proto);
3290: packet_put_cstring(new_data);
1.25 markus 3291: packet_put_int(screen_number);
3292: packet_send();
3293: packet_write_wait();
3294: xfree(new_data);
1.1 deraadt 3295: }
3296:
1.121 markus 3297:
3298: /* -- agent forwarding */
3299:
1.1 deraadt 3300: /* Sends a message to the server to request authentication fd forwarding. */
3301:
1.49 markus 3302: void
1.142 itojun 3303: auth_request_forwarding(void)
1.1 deraadt 3304: {
1.25 markus 3305: packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
3306: packet_send();
3307: packet_write_wait();
1.1 deraadt 3308: }
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