Annotation of src/usr.bin/ssh/channels.c, Revision 1.276
1.276 ! djm 1: /* $OpenBSD: channels.c,v 1.275 2008/05/08 12:02:23 djm 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 */
1.157 markus 817: if (compat20 && c->efd != -1) {
1.44 markus 818: if (c->extended_usage == CHAN_EXTENDED_WRITE &&
819: buffer_len(&c->extended) > 0)
820: FD_SET(c->efd, writeset);
1.172 markus 821: else if (!(c->flags & CHAN_EOF_SENT) &&
822: c->extended_usage == CHAN_EXTENDED_READ &&
1.44 markus 823: buffer_len(&c->extended) < c->remote_window)
824: FD_SET(c->efd, readset);
825: }
1.204 djm 826: /* XXX: What about efd? races? */
1.208 deraadt 827: if (compat20 && c->ctl_fd != -1 &&
1.204 djm 828: c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN)
829: FD_SET(c->ctl_fd, readset);
1.44 markus 830: }
831:
1.259 stevesk 832: /* ARGSUSED */
1.127 itojun 833: static void
1.237 deraadt 834: channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 835: {
836: if (buffer_len(&c->input) == 0) {
837: packet_start(SSH_MSG_CHANNEL_CLOSE);
838: packet_put_int(c->remote_id);
839: packet_send();
840: c->type = SSH_CHANNEL_CLOSED;
1.194 markus 841: debug2("channel %d: closing after input drain.", c->self);
1.41 markus 842: }
843: }
844:
1.259 stevesk 845: /* ARGSUSED */
1.127 itojun 846: static void
1.237 deraadt 847: channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 848: {
849: if (buffer_len(&c->output) == 0)
1.113 markus 850: chan_mark_dead(c);
1.49 markus 851: else
1.41 markus 852: FD_SET(c->sock, writeset);
853: }
854:
855: /*
856: * This is a special state for X11 authentication spoofing. An opened X11
857: * connection (when authentication spoofing is being done) remains in this
858: * state until the first packet has been completely read. The authentication
859: * data in that packet is then substituted by the real data if it matches the
860: * fake data, and the channel is put into normal mode.
1.51 markus 861: * XXX All this happens at the client side.
1.121 markus 862: * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
1.41 markus 863: */
1.127 itojun 864: static int
1.121 markus 865: x11_open_helper(Buffer *b)
1.1 deraadt 866: {
1.77 markus 867: u_char *ucp;
868: u_int proto_len, data_len;
1.25 markus 869:
1.41 markus 870: /* Check if the fixed size part of the packet is in buffer. */
1.121 markus 871: if (buffer_len(b) < 12)
1.41 markus 872: return 0;
873:
874: /* Parse the lengths of variable-length fields. */
1.155 stevesk 875: ucp = buffer_ptr(b);
1.41 markus 876: if (ucp[0] == 0x42) { /* Byte order MSB first. */
877: proto_len = 256 * ucp[6] + ucp[7];
878: data_len = 256 * ucp[8] + ucp[9];
879: } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
880: proto_len = ucp[6] + 256 * ucp[7];
881: data_len = ucp[8] + 256 * ucp[9];
882: } else {
1.194 markus 883: debug2("Initial X11 packet contains bad byte order byte: 0x%x",
1.148 deraadt 884: ucp[0]);
1.41 markus 885: return -1;
886: }
887:
888: /* Check if the whole packet is in buffer. */
1.121 markus 889: if (buffer_len(b) <
1.41 markus 890: 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
891: return 0;
892:
893: /* Check if authentication protocol matches. */
894: if (proto_len != strlen(x11_saved_proto) ||
895: memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
1.194 markus 896: debug2("X11 connection uses different authentication protocol.");
1.41 markus 897: return -1;
898: }
899: /* Check if authentication data matches our fake data. */
900: if (data_len != x11_fake_data_len ||
901: memcmp(ucp + 12 + ((proto_len + 3) & ~3),
902: x11_fake_data, x11_fake_data_len) != 0) {
1.194 markus 903: debug2("X11 auth data does not match fake data.");
1.41 markus 904: return -1;
905: }
906: /* Check fake data length */
907: if (x11_fake_data_len != x11_saved_data_len) {
908: error("X11 fake_data_len %d != saved_data_len %d",
909: x11_fake_data_len, x11_saved_data_len);
910: return -1;
911: }
912: /*
913: * Received authentication protocol and data match
914: * our fake data. Substitute the fake data with real
915: * data.
916: */
917: memcpy(ucp + 12 + ((proto_len + 3) & ~3),
918: x11_saved_data, x11_saved_data_len);
919: return 1;
920: }
921:
1.127 itojun 922: static void
1.237 deraadt 923: channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 924: {
1.121 markus 925: int ret = x11_open_helper(&c->output);
1.180 deraadt 926:
1.41 markus 927: if (ret == 1) {
928: /* Start normal processing for the channel. */
929: c->type = SSH_CHANNEL_OPEN;
1.47 markus 930: channel_pre_open_13(c, readset, writeset);
1.41 markus 931: } else if (ret == -1) {
932: /*
933: * We have received an X11 connection that has bad
934: * authentication information.
935: */
1.188 itojun 936: logit("X11 connection rejected because of wrong authentication.");
1.41 markus 937: buffer_clear(&c->input);
938: buffer_clear(&c->output);
1.132 markus 939: channel_close_fd(&c->sock);
1.41 markus 940: c->sock = -1;
941: c->type = SSH_CHANNEL_CLOSED;
942: packet_start(SSH_MSG_CHANNEL_CLOSE);
943: packet_put_int(c->remote_id);
944: packet_send();
945: }
946: }
1.25 markus 947:
1.127 itojun 948: static void
1.237 deraadt 949: channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 950: {
1.121 markus 951: int ret = x11_open_helper(&c->output);
1.133 markus 952:
953: /* c->force_drain = 1; */
954:
1.41 markus 955: if (ret == 1) {
956: c->type = SSH_CHANNEL_OPEN;
1.157 markus 957: channel_pre_open(c, readset, writeset);
1.41 markus 958: } else if (ret == -1) {
1.188 itojun 959: logit("X11 connection rejected because of wrong authentication.");
1.194 markus 960: debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
1.156 markus 961: chan_read_failed(c);
962: buffer_clear(&c->input);
963: chan_ibuf_empty(c);
964: buffer_clear(&c->output);
965: /* for proto v1, the peer will send an IEOF */
966: if (compat20)
967: chan_write_failed(c);
968: else
969: c->type = SSH_CHANNEL_OPEN;
1.194 markus 970: debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
1.41 markus 971: }
972: }
1.25 markus 973:
1.104 markus 974: /* try to decode a socks4 header */
1.259 stevesk 975: /* ARGSUSED */
1.127 itojun 976: static int
1.237 deraadt 977: channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset)
1.103 markus 978: {
1.181 markus 979: char *p, *host;
1.217 djm 980: u_int len, have, i, found;
1.148 deraadt 981: char username[256];
1.103 markus 982: struct {
983: u_int8_t version;
984: u_int8_t command;
985: u_int16_t dest_port;
1.104 markus 986: struct in_addr dest_addr;
1.103 markus 987: } s4_req, s4_rsp;
988:
1.104 markus 989: debug2("channel %d: decode socks4", c->self);
1.109 markus 990:
991: have = buffer_len(&c->input);
992: len = sizeof(s4_req);
993: if (have < len)
994: return 0;
995: p = buffer_ptr(&c->input);
996: for (found = 0, i = len; i < have; i++) {
997: if (p[i] == '\0') {
998: found = 1;
999: break;
1000: }
1001: if (i > 1024) {
1002: /* the peer is probably sending garbage */
1003: debug("channel %d: decode socks4: too long",
1004: c->self);
1005: return -1;
1006: }
1007: }
1008: if (!found)
1009: return 0;
1.103 markus 1010: buffer_get(&c->input, (char *)&s4_req.version, 1);
1011: buffer_get(&c->input, (char *)&s4_req.command, 1);
1012: buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
1.104 markus 1013: buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
1.109 markus 1014: have = buffer_len(&c->input);
1.103 markus 1015: p = buffer_ptr(&c->input);
1016: len = strlen(p);
1.106 markus 1017: debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
1.103 markus 1018: if (len > have)
1.104 markus 1019: fatal("channel %d: decode socks4: len %d > have %d",
1.103 markus 1020: c->self, len, have);
1021: strlcpy(username, p, sizeof(username));
1022: buffer_consume(&c->input, len);
1023: buffer_consume(&c->input, 1); /* trailing '\0' */
1024:
1.104 markus 1025: host = inet_ntoa(s4_req.dest_addr);
1.103 markus 1026: strlcpy(c->path, host, sizeof(c->path));
1027: c->host_port = ntohs(s4_req.dest_port);
1.148 deraadt 1028:
1.194 markus 1029: debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
1.106 markus 1030: c->self, host, c->host_port, s4_req.command);
1.103 markus 1031:
1.104 markus 1032: if (s4_req.command != 1) {
1033: debug("channel %d: cannot handle: socks4 cn %d",
1034: c->self, s4_req.command);
1035: return -1;
1.103 markus 1036: }
1.104 markus 1037: s4_rsp.version = 0; /* vn: 0 for reply */
1038: s4_rsp.command = 90; /* cd: req granted */
1.103 markus 1039: s4_rsp.dest_port = 0; /* ignored */
1.104 markus 1040: s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
1.246 deraadt 1041: buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp));
1.104 markus 1042: return 1;
1043: }
1044:
1.193 markus 1045: /* try to decode a socks5 header */
1046: #define SSH_SOCKS5_AUTHDONE 0x1000
1047: #define SSH_SOCKS5_NOAUTH 0x00
1048: #define SSH_SOCKS5_IPV4 0x01
1049: #define SSH_SOCKS5_DOMAIN 0x03
1050: #define SSH_SOCKS5_IPV6 0x04
1051: #define SSH_SOCKS5_CONNECT 0x01
1052: #define SSH_SOCKS5_SUCCESS 0x00
1053:
1.259 stevesk 1054: /* ARGSUSED */
1.193 markus 1055: static int
1.237 deraadt 1056: channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset)
1.193 markus 1057: {
1058: struct {
1059: u_int8_t version;
1060: u_int8_t command;
1061: u_int8_t reserved;
1062: u_int8_t atyp;
1063: } s5_req, s5_rsp;
1064: u_int16_t dest_port;
1065: u_char *p, dest_addr[255+1];
1.252 djm 1066: u_int have, need, i, found, nmethods, addrlen, af;
1.193 markus 1067:
1068: debug2("channel %d: decode socks5", c->self);
1069: p = buffer_ptr(&c->input);
1070: if (p[0] != 0x05)
1071: return -1;
1072: have = buffer_len(&c->input);
1073: if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
1074: /* format: ver | nmethods | methods */
1.198 djm 1075: if (have < 2)
1.193 markus 1076: return 0;
1077: nmethods = p[1];
1078: if (have < nmethods + 2)
1079: return 0;
1080: /* look for method: "NO AUTHENTICATION REQUIRED" */
1.268 stevesk 1081: for (found = 0, i = 2; i < nmethods + 2; i++) {
1.264 stevesk 1082: if (p[i] == SSH_SOCKS5_NOAUTH) {
1.193 markus 1083: found = 1;
1084: break;
1085: }
1086: }
1087: if (!found) {
1088: debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
1089: c->self);
1090: return -1;
1091: }
1092: buffer_consume(&c->input, nmethods + 2);
1093: buffer_put_char(&c->output, 0x05); /* version */
1094: buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
1095: FD_SET(c->sock, writeset);
1096: c->flags |= SSH_SOCKS5_AUTHDONE;
1097: debug2("channel %d: socks5 auth done", c->self);
1098: return 0; /* need more */
1099: }
1100: debug2("channel %d: socks5 post auth", c->self);
1101: if (have < sizeof(s5_req)+1)
1102: return 0; /* need more */
1.247 deraadt 1103: memcpy(&s5_req, p, sizeof(s5_req));
1.193 markus 1104: if (s5_req.version != 0x05 ||
1105: s5_req.command != SSH_SOCKS5_CONNECT ||
1106: s5_req.reserved != 0x00) {
1.194 markus 1107: debug2("channel %d: only socks5 connect supported", c->self);
1.193 markus 1108: return -1;
1109: }
1.213 deraadt 1110: switch (s5_req.atyp){
1.193 markus 1111: case SSH_SOCKS5_IPV4:
1112: addrlen = 4;
1113: af = AF_INET;
1114: break;
1115: case SSH_SOCKS5_DOMAIN:
1116: addrlen = p[sizeof(s5_req)];
1117: af = -1;
1118: break;
1119: case SSH_SOCKS5_IPV6:
1120: addrlen = 16;
1121: af = AF_INET6;
1122: break;
1123: default:
1.194 markus 1124: debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
1.193 markus 1125: return -1;
1126: }
1.252 djm 1127: need = sizeof(s5_req) + addrlen + 2;
1128: if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1129: need++;
1130: if (have < need)
1.193 markus 1131: return 0;
1132: buffer_consume(&c->input, sizeof(s5_req));
1133: if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1134: buffer_consume(&c->input, 1); /* host string length */
1135: buffer_get(&c->input, (char *)&dest_addr, addrlen);
1136: buffer_get(&c->input, (char *)&dest_port, 2);
1137: dest_addr[addrlen] = '\0';
1138: if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1.201 deraadt 1139: strlcpy(c->path, (char *)dest_addr, sizeof(c->path));
1.193 markus 1140: else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL)
1141: return -1;
1142: c->host_port = ntohs(dest_port);
1.198 djm 1143:
1.194 markus 1144: debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
1.193 markus 1145: c->self, c->path, c->host_port, s5_req.command);
1146:
1147: s5_rsp.version = 0x05;
1148: s5_rsp.command = SSH_SOCKS5_SUCCESS;
1149: s5_rsp.reserved = 0; /* ignored */
1150: s5_rsp.atyp = SSH_SOCKS5_IPV4;
1151: ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY;
1152: dest_port = 0; /* ignored */
1153:
1.246 deraadt 1154: buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp));
1155: buffer_append(&c->output, &dest_addr, sizeof(struct in_addr));
1156: buffer_append(&c->output, &dest_port, sizeof(dest_port));
1.193 markus 1157: return 1;
1158: }
1159:
1.104 markus 1160: /* dynamic port forwarding */
1.127 itojun 1161: static void
1.237 deraadt 1162: channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset)
1.104 markus 1163: {
1164: u_char *p;
1.217 djm 1165: u_int have;
1166: int ret;
1.103 markus 1167:
1.104 markus 1168: have = buffer_len(&c->input);
1.137 markus 1169: c->delayed = 0;
1.104 markus 1170: debug2("channel %d: pre_dynamic: have %d", c->self, have);
1.105 markus 1171: /* buffer_dump(&c->input); */
1.104 markus 1172: /* check if the fixed size part of the packet is in buffer. */
1.193 markus 1173: if (have < 3) {
1.104 markus 1174: /* need more */
1175: FD_SET(c->sock, readset);
1176: return;
1177: }
1178: /* try to guess the protocol */
1179: p = buffer_ptr(&c->input);
1180: switch (p[0]) {
1181: case 0x04:
1182: ret = channel_decode_socks4(c, readset, writeset);
1.193 markus 1183: break;
1184: case 0x05:
1185: ret = channel_decode_socks5(c, readset, writeset);
1.104 markus 1186: break;
1187: default:
1188: ret = -1;
1189: break;
1190: }
1191: if (ret < 0) {
1.113 markus 1192: chan_mark_dead(c);
1.104 markus 1193: } else if (ret == 0) {
1194: debug2("channel %d: pre_dynamic: need more", c->self);
1195: /* need more */
1196: FD_SET(c->sock, readset);
1197: } else {
1198: /* switch to the next state */
1199: c->type = SSH_CHANNEL_OPENING;
1200: port_open_helper(c, "direct-tcpip");
1201: }
1.103 markus 1202: }
1203:
1.41 markus 1204: /* This is our fake X11 server socket. */
1.259 stevesk 1205: /* ARGSUSED */
1.127 itojun 1206: static void
1.237 deraadt 1207: channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 1208: {
1.113 markus 1209: Channel *nc;
1.41 markus 1210: struct sockaddr addr;
1.162 stevesk 1211: int newsock;
1.41 markus 1212: socklen_t addrlen;
1.85 markus 1213: char buf[16384], *remote_ipaddr;
1.51 markus 1214: int remote_port;
1.25 markus 1215:
1.41 markus 1216: if (FD_ISSET(c->sock, readset)) {
1217: debug("X11 connection requested.");
1218: addrlen = sizeof(addr);
1219: newsock = accept(c->sock, &addr, &addrlen);
1.149 markus 1220: if (c->single_connection) {
1.194 markus 1221: debug2("single_connection: closing X11 listener.");
1.149 markus 1222: channel_close_fd(&c->sock);
1223: chan_mark_dead(c);
1224: }
1.41 markus 1225: if (newsock < 0) {
1226: error("accept: %.100s", strerror(errno));
1227: return;
1228: }
1.162 stevesk 1229: set_nodelay(newsock);
1.85 markus 1230: remote_ipaddr = get_peer_ipaddr(newsock);
1.51 markus 1231: remote_port = get_peer_port(newsock);
1.41 markus 1232: snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
1.85 markus 1233: remote_ipaddr, remote_port);
1.51 markus 1234:
1.113 markus 1235: nc = channel_new("accepted x11 socket",
1.51 markus 1236: SSH_CHANNEL_OPENING, newsock, newsock, -1,
1.190 markus 1237: c->local_window_max, c->local_maxpacket, 0, buf, 1);
1.51 markus 1238: if (compat20) {
1239: packet_start(SSH2_MSG_CHANNEL_OPEN);
1240: packet_put_cstring("x11");
1.113 markus 1241: packet_put_int(nc->self);
1.149 markus 1242: packet_put_int(nc->local_window_max);
1243: packet_put_int(nc->local_maxpacket);
1.85 markus 1244: /* originator ipaddr and port */
1245: packet_put_cstring(remote_ipaddr);
1.57 markus 1246: if (datafellows & SSH_BUG_X11FWD) {
1.194 markus 1247: debug2("ssh2 x11 bug compat mode");
1.57 markus 1248: } else {
1249: packet_put_int(remote_port);
1250: }
1.51 markus 1251: packet_send();
1252: } else {
1253: packet_start(SSH_SMSG_X11_OPEN);
1.113 markus 1254: packet_put_int(nc->self);
1.121 markus 1255: if (packet_get_protocol_flags() &
1256: SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
1.125 markus 1257: packet_put_cstring(buf);
1.51 markus 1258: packet_send();
1259: }
1.85 markus 1260: xfree(remote_ipaddr);
1.41 markus 1261: }
1262: }
1.25 markus 1263:
1.127 itojun 1264: static void
1.103 markus 1265: port_open_helper(Channel *c, char *rtype)
1266: {
1267: int direct;
1268: char buf[1024];
1269: char *remote_ipaddr = get_peer_ipaddr(c->sock);
1.216 markus 1270: int remote_port = get_peer_port(c->sock);
1.103 markus 1271:
1272: direct = (strcmp(rtype, "direct-tcpip") == 0);
1273:
1274: snprintf(buf, sizeof buf,
1275: "%s: listening port %d for %.100s port %d, "
1276: "connect from %.200s port %d",
1277: rtype, c->listening_port, c->path, c->host_port,
1278: remote_ipaddr, remote_port);
1279:
1280: xfree(c->remote_name);
1281: c->remote_name = xstrdup(buf);
1282:
1283: if (compat20) {
1284: packet_start(SSH2_MSG_CHANNEL_OPEN);
1285: packet_put_cstring(rtype);
1286: packet_put_int(c->self);
1287: packet_put_int(c->local_window_max);
1288: packet_put_int(c->local_maxpacket);
1289: if (direct) {
1290: /* target host, port */
1291: packet_put_cstring(c->path);
1292: packet_put_int(c->host_port);
1293: } else {
1294: /* listen address, port */
1295: packet_put_cstring(c->path);
1296: packet_put_int(c->listening_port);
1297: }
1298: /* originator host and port */
1299: packet_put_cstring(remote_ipaddr);
1.216 markus 1300: packet_put_int((u_int)remote_port);
1.103 markus 1301: packet_send();
1302: } else {
1303: packet_start(SSH_MSG_PORT_OPEN);
1304: packet_put_int(c->self);
1305: packet_put_cstring(c->path);
1306: packet_put_int(c->host_port);
1.121 markus 1307: if (packet_get_protocol_flags() &
1308: SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
1.103 markus 1309: packet_put_cstring(c->remote_name);
1310: packet_send();
1311: }
1312: xfree(remote_ipaddr);
1313: }
1314:
1.226 djm 1315: static void
1316: channel_set_reuseaddr(int fd)
1317: {
1318: int on = 1;
1319:
1320: /*
1321: * Set socket options.
1322: * Allow local port reuse in TIME_WAIT.
1323: */
1324: if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1)
1325: error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
1326: }
1327:
1.41 markus 1328: /*
1329: * This socket is listening for connections to a forwarded TCP/IP port.
1330: */
1.259 stevesk 1331: /* ARGSUSED */
1.127 itojun 1332: static void
1.237 deraadt 1333: channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 1334: {
1.103 markus 1335: Channel *nc;
1.41 markus 1336: struct sockaddr addr;
1.113 markus 1337: int newsock, nextstate;
1.41 markus 1338: socklen_t addrlen;
1.103 markus 1339: char *rtype;
1.73 markus 1340:
1.41 markus 1341: if (FD_ISSET(c->sock, readset)) {
1342: debug("Connection to port %d forwarding "
1343: "to %.100s port %d requested.",
1344: c->listening_port, c->path, c->host_port);
1.103 markus 1345:
1.137 markus 1346: if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1347: nextstate = SSH_CHANNEL_OPENING;
1348: rtype = "forwarded-tcpip";
1349: } else {
1350: if (c->host_port == 0) {
1351: nextstate = SSH_CHANNEL_DYNAMIC;
1.138 markus 1352: rtype = "dynamic-tcpip";
1.137 markus 1353: } else {
1354: nextstate = SSH_CHANNEL_OPENING;
1355: rtype = "direct-tcpip";
1356: }
1357: }
1.103 markus 1358:
1.41 markus 1359: addrlen = sizeof(addr);
1360: newsock = accept(c->sock, &addr, &addrlen);
1361: if (newsock < 0) {
1362: error("accept: %.100s", strerror(errno));
1363: return;
1364: }
1.169 stevesk 1365: set_nodelay(newsock);
1.190 markus 1366: nc = channel_new(rtype, nextstate, newsock, newsock, -1,
1367: c->local_window_max, c->local_maxpacket, 0, rtype, 1);
1.103 markus 1368: nc->listening_port = c->listening_port;
1369: nc->host_port = c->host_port;
1370: strlcpy(nc->path, c->path, sizeof(nc->path));
1371:
1.137 markus 1372: if (nextstate == SSH_CHANNEL_DYNAMIC) {
1373: /*
1374: * do not call the channel_post handler until
1375: * this flag has been reset by a pre-handler.
1376: * otherwise the FD_ISSET calls might overflow
1377: */
1378: nc->delayed = 1;
1379: } else {
1.103 markus 1380: port_open_helper(nc, rtype);
1.137 markus 1381: }
1.41 markus 1382: }
1383: }
1.25 markus 1384:
1.41 markus 1385: /*
1386: * This is the authentication agent socket listening for connections from
1387: * clients.
1388: */
1.259 stevesk 1389: /* ARGSUSED */
1.127 itojun 1390: static void
1.237 deraadt 1391: channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 1392: {
1.113 markus 1393: Channel *nc;
1394: int newsock;
1.41 markus 1395: struct sockaddr addr;
1396: socklen_t addrlen;
1.25 markus 1397:
1.41 markus 1398: if (FD_ISSET(c->sock, readset)) {
1399: addrlen = sizeof(addr);
1400: newsock = accept(c->sock, &addr, &addrlen);
1401: if (newsock < 0) {
1402: error("accept from auth socket: %.100s", strerror(errno));
1403: return;
1404: }
1.113 markus 1405: nc = channel_new("accepted auth socket",
1.73 markus 1406: SSH_CHANNEL_OPENING, newsock, newsock, -1,
1407: c->local_window_max, c->local_maxpacket,
1.190 markus 1408: 0, "accepted auth socket", 1);
1.73 markus 1409: if (compat20) {
1410: packet_start(SSH2_MSG_CHANNEL_OPEN);
1411: packet_put_cstring("auth-agent@openssh.com");
1.113 markus 1412: packet_put_int(nc->self);
1.73 markus 1413: packet_put_int(c->local_window_max);
1414: packet_put_int(c->local_maxpacket);
1415: } else {
1416: packet_start(SSH_SMSG_AGENT_OPEN);
1.113 markus 1417: packet_put_int(nc->self);
1.73 markus 1418: }
1.41 markus 1419: packet_send();
1420: }
1421: }
1.25 markus 1422:
1.259 stevesk 1423: /* ARGSUSED */
1.127 itojun 1424: static void
1.237 deraadt 1425: channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset)
1.75 markus 1426: {
1.276 ! djm 1427: int err = 0, sock;
1.129 stevesk 1428: socklen_t sz = sizeof(err);
1.114 markus 1429:
1.75 markus 1430: if (FD_ISSET(c->sock, writeset)) {
1.170 stevesk 1431: if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
1.114 markus 1432: err = errno;
1433: error("getsockopt SO_ERROR failed");
1434: }
1435: if (err == 0) {
1.276 ! djm 1436: debug("channel %d: connected to %s port %d",
! 1437: c->self, c->connect_ctx.host, c->connect_ctx.port);
! 1438: channel_connect_ctx_free(&c->connect_ctx);
1.114 markus 1439: c->type = SSH_CHANNEL_OPEN;
1440: if (compat20) {
1441: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1442: packet_put_int(c->remote_id);
1443: packet_put_int(c->self);
1444: packet_put_int(c->local_window);
1445: packet_put_int(c->local_maxpacket);
1446: } else {
1447: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1448: packet_put_int(c->remote_id);
1449: packet_put_int(c->self);
1450: }
1.75 markus 1451: } else {
1.276 ! djm 1452: debug("channel %d: connection failed: %s",
1.114 markus 1453: c->self, strerror(err));
1.276 ! djm 1454: /* Try next address, if any */
! 1455: if ((sock = connect_next(&c->connect_ctx)) > 0) {
! 1456: close(c->sock);
! 1457: c->sock = c->rfd = c->wfd = sock;
! 1458: channel_max_fd = channel_find_maxfd();
! 1459: return;
! 1460: }
! 1461: /* Exhausted all addresses */
! 1462: error("connect_to %.100s port %d: failed.",
! 1463: c->connect_ctx.host, c->connect_ctx.port);
! 1464: channel_connect_ctx_free(&c->connect_ctx);
1.114 markus 1465: if (compat20) {
1466: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1467: packet_put_int(c->remote_id);
1468: packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1469: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1470: packet_put_cstring(strerror(err));
1471: packet_put_cstring("");
1472: }
1.75 markus 1473: } else {
1.114 markus 1474: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1475: packet_put_int(c->remote_id);
1.75 markus 1476: }
1.114 markus 1477: chan_mark_dead(c);
1.75 markus 1478: }
1.114 markus 1479: packet_send();
1.75 markus 1480: }
1481: }
1482:
1.259 stevesk 1483: /* ARGSUSED */
1.127 itojun 1484: static int
1.237 deraadt 1485: channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 1486: {
1.214 markus 1487: char buf[CHAN_RBUF];
1.41 markus 1488: int len;
1.25 markus 1489:
1.118 markus 1490: if (c->rfd != -1 &&
1.41 markus 1491: FD_ISSET(c->rfd, readset)) {
1492: len = read(c->rfd, buf, sizeof(buf));
1.53 markus 1493: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1494: return 1;
1.41 markus 1495: if (len <= 0) {
1.194 markus 1496: debug2("channel %d: read<=0 rfd %d len %d",
1.41 markus 1497: c->self, c->rfd, len);
1.104 markus 1498: if (c->type != SSH_CHANNEL_OPEN) {
1.194 markus 1499: debug2("channel %d: not open", c->self);
1.113 markus 1500: chan_mark_dead(c);
1.103 markus 1501: return -1;
1.104 markus 1502: } else if (compat13) {
1.158 markus 1503: buffer_clear(&c->output);
1.41 markus 1504: c->type = SSH_CHANNEL_INPUT_DRAINING;
1.194 markus 1505: debug2("channel %d: input draining.", c->self);
1.25 markus 1506: } else {
1.41 markus 1507: chan_read_failed(c);
1.25 markus 1508: }
1.41 markus 1509: return -1;
1510: }
1.143 deraadt 1511: if (c->input_filter != NULL) {
1.66 markus 1512: if (c->input_filter(c, buf, len) == -1) {
1.194 markus 1513: debug2("channel %d: filter stops", c->self);
1.65 markus 1514: chan_read_failed(c);
1515: }
1.228 reyk 1516: } else if (c->datagram) {
1517: buffer_put_string(&c->input, buf, len);
1.65 markus 1518: } else {
1519: buffer_append(&c->input, buf, len);
1520: }
1.41 markus 1521: }
1522: return 1;
1523: }
1.241 deraadt 1524:
1.259 stevesk 1525: /* ARGSUSED */
1.127 itojun 1526: static int
1.237 deraadt 1527: channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 1528: {
1.95 markus 1529: struct termios tio;
1.231 reyk 1530: u_char *data = NULL, *buf;
1.134 markus 1531: u_int dlen;
1.41 markus 1532: int len;
1.25 markus 1533:
1.41 markus 1534: /* Send buffered output data to the socket. */
1.118 markus 1535: if (c->wfd != -1 &&
1.41 markus 1536: FD_ISSET(c->wfd, writeset) &&
1537: buffer_len(&c->output) > 0) {
1.231 reyk 1538: if (c->output_filter != NULL) {
1539: if ((buf = c->output_filter(c, &data, &dlen)) == NULL) {
1540: debug2("channel %d: filter stops", c->self);
1.232 reyk 1541: if (c->type != SSH_CHANNEL_OPEN)
1542: chan_mark_dead(c);
1543: else
1544: chan_write_failed(c);
1545: return -1;
1.231 reyk 1546: }
1547: } else if (c->datagram) {
1548: buf = data = buffer_get_string(&c->output, &dlen);
1549: } else {
1550: buf = data = buffer_ptr(&c->output);
1551: dlen = buffer_len(&c->output);
1552: }
1553:
1.228 reyk 1554: if (c->datagram) {
1555: /* ignore truncated writes, datagrams might get lost */
1556: c->local_consumed += dlen + 4;
1.231 reyk 1557: len = write(c->wfd, buf, dlen);
1.228 reyk 1558: xfree(data);
1559: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1560: return 1;
1561: if (len <= 0) {
1562: if (c->type != SSH_CHANNEL_OPEN)
1563: chan_mark_dead(c);
1564: else
1565: chan_write_failed(c);
1566: return -1;
1567: }
1568: return 1;
1569: }
1.231 reyk 1570:
1571: len = write(c->wfd, buf, dlen);
1.53 markus 1572: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1573: return 1;
1.41 markus 1574: if (len <= 0) {
1.104 markus 1575: if (c->type != SSH_CHANNEL_OPEN) {
1.194 markus 1576: debug2("channel %d: not open", c->self);
1.113 markus 1577: chan_mark_dead(c);
1.104 markus 1578: return -1;
1579: } else if (compat13) {
1.158 markus 1580: buffer_clear(&c->output);
1.194 markus 1581: debug2("channel %d: input draining.", c->self);
1.41 markus 1582: c->type = SSH_CHANNEL_INPUT_DRAINING;
1583: } else {
1584: chan_write_failed(c);
1585: }
1586: return -1;
1.91 markus 1587: }
1.231 reyk 1588: if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') {
1.91 markus 1589: if (tcgetattr(c->wfd, &tio) == 0 &&
1590: !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1591: /*
1592: * Simulate echo to reduce the impact of
1.96 markus 1593: * traffic analysis. We need to match the
1.95 markus 1594: * size of a SSH2_MSG_CHANNEL_DATA message
1.231 reyk 1595: * (4 byte channel id + buf)
1.91 markus 1596: */
1.95 markus 1597: packet_send_ignore(4 + len);
1.91 markus 1598: packet_send();
1599: }
1.25 markus 1600: }
1.41 markus 1601: buffer_consume(&c->output, len);
1.44 markus 1602: if (compat20 && len > 0) {
1603: c->local_consumed += len;
1604: }
1605: }
1606: return 1;
1607: }
1.241 deraadt 1608:
1.127 itojun 1609: static int
1.237 deraadt 1610: channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset)
1.44 markus 1611: {
1.214 markus 1612: char buf[CHAN_RBUF];
1.44 markus 1613: int len;
1614:
1.45 markus 1615: /** XXX handle drain efd, too */
1.44 markus 1616: if (c->efd != -1) {
1617: if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1618: FD_ISSET(c->efd, writeset) &&
1619: buffer_len(&c->extended) > 0) {
1620: len = write(c->efd, buffer_ptr(&c->extended),
1621: buffer_len(&c->extended));
1.70 markus 1622: debug2("channel %d: written %d to efd %d",
1.44 markus 1623: c->self, len, c->efd);
1.93 markus 1624: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1625: return 1;
1626: if (len <= 0) {
1627: debug2("channel %d: closing write-efd %d",
1628: c->self, c->efd);
1.132 markus 1629: channel_close_fd(&c->efd);
1.93 markus 1630: } else {
1.44 markus 1631: buffer_consume(&c->extended, len);
1632: c->local_consumed += len;
1633: }
1634: } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1635: FD_ISSET(c->efd, readset)) {
1636: len = read(c->efd, buf, sizeof(buf));
1.70 markus 1637: debug2("channel %d: read %d from efd %d",
1.148 deraadt 1638: c->self, len, c->efd);
1.93 markus 1639: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1640: return 1;
1641: if (len <= 0) {
1642: debug2("channel %d: closing read-efd %d",
1.45 markus 1643: c->self, c->efd);
1.132 markus 1644: channel_close_fd(&c->efd);
1.93 markus 1645: } else {
1.44 markus 1646: buffer_append(&c->extended, buf, len);
1.93 markus 1647: }
1.44 markus 1648: }
1649: }
1650: return 1;
1651: }
1.241 deraadt 1652:
1.259 stevesk 1653: /* ARGSUSED */
1.127 itojun 1654: static int
1.237 deraadt 1655: channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset)
1.204 djm 1656: {
1657: char buf[16];
1658: int len;
1659:
1660: /* Monitor control fd to detect if the slave client exits */
1661: if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) {
1662: len = read(c->ctl_fd, buf, sizeof(buf));
1663: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1664: return 1;
1665: if (len <= 0) {
1666: debug2("channel %d: ctl read<=0", c->self);
1667: if (c->type != SSH_CHANNEL_OPEN) {
1668: debug2("channel %d: not open", c->self);
1669: chan_mark_dead(c);
1670: return -1;
1671: } else {
1672: chan_read_failed(c);
1673: chan_write_failed(c);
1674: }
1675: return -1;
1676: } else
1677: fatal("%s: unexpected data on ctl fd", __func__);
1678: }
1679: return 1;
1680: }
1.241 deraadt 1681:
1.204 djm 1682: static int
1.93 markus 1683: channel_check_window(Channel *c)
1.44 markus 1684: {
1.104 markus 1685: if (c->type == SSH_CHANNEL_OPEN &&
1686: !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
1.270 dtucker 1687: ((c->local_window_max - c->local_window >
1.269 markus 1688: c->local_maxpacket*3) ||
1689: c->local_window < c->local_window_max/2) &&
1.44 markus 1690: c->local_consumed > 0) {
1691: packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1692: packet_put_int(c->remote_id);
1693: packet_put_int(c->local_consumed);
1694: packet_send();
1.70 markus 1695: debug2("channel %d: window %d sent adjust %d",
1.44 markus 1696: c->self, c->local_window,
1697: c->local_consumed);
1698: c->local_window += c->local_consumed;
1699: c->local_consumed = 0;
1.1 deraadt 1700: }
1.41 markus 1701: return 1;
1.1 deraadt 1702: }
1703:
1.127 itojun 1704: static void
1.237 deraadt 1705: channel_post_open(Channel *c, fd_set *readset, fd_set *writeset)
1.41 markus 1706: {
1.137 markus 1707: if (c->delayed)
1708: return;
1.41 markus 1709: channel_handle_rfd(c, readset, writeset);
1710: channel_handle_wfd(c, readset, writeset);
1.157 markus 1711: if (!compat20)
1.137 markus 1712: return;
1.44 markus 1713: channel_handle_efd(c, readset, writeset);
1.204 djm 1714: channel_handle_ctl(c, readset, writeset);
1.93 markus 1715: channel_check_window(c);
1.44 markus 1716: }
1717:
1.259 stevesk 1718: /* ARGSUSED */
1.127 itojun 1719: static void
1.237 deraadt 1720: channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset)
1.1 deraadt 1721: {
1.41 markus 1722: int len;
1.180 deraadt 1723:
1.41 markus 1724: /* Send buffered output data to the socket. */
1725: if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1726: len = write(c->sock, buffer_ptr(&c->output),
1727: buffer_len(&c->output));
1728: if (len <= 0)
1.158 markus 1729: buffer_clear(&c->output);
1.41 markus 1730: else
1731: buffer_consume(&c->output, len);
1732: }
1733: }
1.25 markus 1734:
1.127 itojun 1735: static void
1.44 markus 1736: channel_handler_init_20(void)
1737: {
1.157 markus 1738: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
1.51 markus 1739: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
1.44 markus 1740: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1.73 markus 1741: channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
1.51 markus 1742: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1.73 markus 1743: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1.75 markus 1744: channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
1.103 markus 1745: channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.44 markus 1746:
1.157 markus 1747: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
1.44 markus 1748: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1.73 markus 1749: channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
1.51 markus 1750: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1.73 markus 1751: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1.75 markus 1752: channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
1.157 markus 1753: channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
1.44 markus 1754: }
1755:
1.127 itojun 1756: static void
1.41 markus 1757: channel_handler_init_13(void)
1758: {
1759: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1760: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1761: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1762: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1763: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1764: channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1765: channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
1.75 markus 1766: channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
1.103 markus 1767: channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.25 markus 1768:
1.157 markus 1769: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
1.41 markus 1770: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1771: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1772: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1773: channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
1.75 markus 1774: channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
1.157 markus 1775: channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
1.41 markus 1776: }
1.25 markus 1777:
1.127 itojun 1778: static void
1.41 markus 1779: channel_handler_init_15(void)
1780: {
1.157 markus 1781: channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
1.51 markus 1782: channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
1.41 markus 1783: channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1784: channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1785: channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1.75 markus 1786: channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
1.103 markus 1787: channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.25 markus 1788:
1.41 markus 1789: channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1790: channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1791: channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1.157 markus 1792: channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
1.75 markus 1793: channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
1.157 markus 1794: channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
1.41 markus 1795: }
1.27 markus 1796:
1.127 itojun 1797: static void
1.41 markus 1798: channel_handler_init(void)
1799: {
1800: int i;
1.180 deraadt 1801:
1.148 deraadt 1802: for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
1.41 markus 1803: channel_pre[i] = NULL;
1804: channel_post[i] = NULL;
1805: }
1.44 markus 1806: if (compat20)
1807: channel_handler_init_20();
1808: else if (compat13)
1.41 markus 1809: channel_handler_init_13();
1810: else
1811: channel_handler_init_15();
1812: }
1.25 markus 1813:
1.140 markus 1814: /* gc dead channels */
1815: static void
1816: channel_garbage_collect(Channel *c)
1817: {
1818: if (c == NULL)
1819: return;
1820: if (c->detach_user != NULL) {
1.225 djm 1821: if (!chan_is_dead(c, c->detach_close))
1.140 markus 1822: return;
1.194 markus 1823: debug2("channel %d: gc: notify user", c->self);
1.140 markus 1824: c->detach_user(c->self, NULL);
1825: /* if we still have a callback */
1826: if (c->detach_user != NULL)
1827: return;
1.194 markus 1828: debug2("channel %d: gc: user detached", c->self);
1.140 markus 1829: }
1830: if (!chan_is_dead(c, 1))
1831: return;
1.194 markus 1832: debug2("channel %d: garbage collecting", c->self);
1.140 markus 1833: channel_free(c);
1834: }
1835:
1.127 itojun 1836: static void
1.237 deraadt 1837: channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset)
1.41 markus 1838: {
1839: static int did_init = 0;
1.209 avsm 1840: u_int i;
1.41 markus 1841: Channel *c;
1.25 markus 1842:
1.41 markus 1843: if (!did_init) {
1844: channel_handler_init();
1845: did_init = 1;
1846: }
1847: for (i = 0; i < channels_alloc; i++) {
1.113 markus 1848: c = channels[i];
1849: if (c == NULL)
1.41 markus 1850: continue;
1.118 markus 1851: if (ftab[c->type] != NULL)
1852: (*ftab[c->type])(c, readset, writeset);
1.140 markus 1853: channel_garbage_collect(c);
1.1 deraadt 1854: }
1855: }
1856:
1.121 markus 1857: /*
1858: * Allocate/update select bitmasks and add any bits relevant to channels in
1859: * select bitmasks.
1860: */
1.49 markus 1861: void
1.100 markus 1862: channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
1.209 avsm 1863: u_int *nallocp, int rekeying)
1.41 markus 1864: {
1.243 djm 1865: u_int n, sz, nfdset;
1.84 markus 1866:
1867: n = MAX(*maxfdp, channel_max_fd);
1868:
1.243 djm 1869: nfdset = howmany(n+1, NFDBITS);
1870: /* Explicitly test here, because xrealloc isn't always called */
1871: if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask))
1872: fatal("channel_prepare_select: max_fd (%d) is too large", n);
1873: sz = nfdset * sizeof(fd_mask);
1874:
1.132 markus 1875: /* perhaps check sz < nalloc/2 and shrink? */
1876: if (*readsetp == NULL || sz > *nallocp) {
1.243 djm 1877: *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask));
1878: *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask));
1.132 markus 1879: *nallocp = sz;
1.84 markus 1880: }
1.132 markus 1881: *maxfdp = n;
1.84 markus 1882: memset(*readsetp, 0, sz);
1883: memset(*writesetp, 0, sz);
1884:
1.100 markus 1885: if (!rekeying)
1886: channel_handler(channel_pre, *readsetp, *writesetp);
1.41 markus 1887: }
1888:
1.121 markus 1889: /*
1890: * After select, perform any appropriate operations for channels which have
1891: * events pending.
1892: */
1.49 markus 1893: void
1.237 deraadt 1894: channel_after_select(fd_set *readset, fd_set *writeset)
1.41 markus 1895: {
1896: channel_handler(channel_post, readset, writeset);
1897: }
1898:
1.121 markus 1899:
1.84 markus 1900: /* If there is data to send to the connection, enqueue some of it now. */
1.49 markus 1901: void
1.142 itojun 1902: channel_output_poll(void)
1.1 deraadt 1903: {
1.41 markus 1904: Channel *c;
1.209 avsm 1905: u_int i, len;
1.1 deraadt 1906:
1.25 markus 1907: for (i = 0; i < channels_alloc; i++) {
1.113 markus 1908: c = channels[i];
1909: if (c == NULL)
1910: continue;
1.37 markus 1911:
1.121 markus 1912: /*
1913: * We are only interested in channels that can have buffered
1914: * incoming data.
1915: */
1.37 markus 1916: if (compat13) {
1.41 markus 1917: if (c->type != SSH_CHANNEL_OPEN &&
1918: c->type != SSH_CHANNEL_INPUT_DRAINING)
1.37 markus 1919: continue;
1920: } else {
1.41 markus 1921: if (c->type != SSH_CHANNEL_OPEN)
1.37 markus 1922: continue;
1923: }
1.46 markus 1924: if (compat20 &&
1925: (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
1.93 markus 1926: /* XXX is this true? */
1.140 markus 1927: debug3("channel %d: will not send data after close", c->self);
1.44 markus 1928: continue;
1929: }
1.25 markus 1930:
1931: /* Get the amount of buffered data for this channel. */
1.93 markus 1932: if ((c->istate == CHAN_INPUT_OPEN ||
1933: c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1934: (len = buffer_len(&c->input)) > 0) {
1.228 reyk 1935: if (c->datagram) {
1936: if (len > 0) {
1937: u_char *data;
1938: u_int dlen;
1939:
1940: data = buffer_get_string(&c->input,
1941: &dlen);
1942: packet_start(SSH2_MSG_CHANNEL_DATA);
1943: packet_put_int(c->remote_id);
1944: packet_put_string(data, dlen);
1945: packet_send();
1946: c->remote_window -= dlen + 4;
1947: xfree(data);
1948: }
1949: continue;
1950: }
1.121 markus 1951: /*
1952: * Send some data for the other side over the secure
1953: * connection.
1954: */
1.44 markus 1955: if (compat20) {
1956: if (len > c->remote_window)
1957: len = c->remote_window;
1958: if (len > c->remote_maxpacket)
1959: len = c->remote_maxpacket;
1.25 markus 1960: } else {
1.44 markus 1961: if (packet_is_interactive()) {
1962: if (len > 1024)
1963: len = 512;
1964: } else {
1965: /* Keep the packets at reasonable size. */
1966: if (len > packet_get_maxsize()/2)
1967: len = packet_get_maxsize()/2;
1968: }
1.25 markus 1969: }
1.41 markus 1970: if (len > 0) {
1.44 markus 1971: packet_start(compat20 ?
1972: SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
1.41 markus 1973: packet_put_int(c->remote_id);
1974: packet_put_string(buffer_ptr(&c->input), len);
1975: packet_send();
1976: buffer_consume(&c->input, len);
1977: c->remote_window -= len;
1978: }
1979: } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
1.25 markus 1980: if (compat13)
1981: fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
1.27 markus 1982: /*
1983: * input-buffer is empty and read-socket shutdown:
1.172 markus 1984: * tell peer, that we will not send more data: send IEOF.
1985: * hack for extended data: delay EOF if EFD still in use.
1.27 markus 1986: */
1.172 markus 1987: if (CHANNEL_EFD_INPUT_ACTIVE(c))
1.223 djm 1988: debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
1989: c->self, c->efd, buffer_len(&c->extended));
1.172 markus 1990: else
1991: chan_ibuf_empty(c);
1.25 markus 1992: }
1.44 markus 1993: /* Send extended data, i.e. stderr */
1994: if (compat20 &&
1.172 markus 1995: !(c->flags & CHAN_EOF_SENT) &&
1.44 markus 1996: c->remote_window > 0 &&
1997: (len = buffer_len(&c->extended)) > 0 &&
1998: c->extended_usage == CHAN_EXTENDED_READ) {
1.178 markus 1999: debug2("channel %d: rwin %u elen %u euse %d",
1.93 markus 2000: c->self, c->remote_window, buffer_len(&c->extended),
2001: c->extended_usage);
1.44 markus 2002: if (len > c->remote_window)
2003: len = c->remote_window;
2004: if (len > c->remote_maxpacket)
2005: len = c->remote_maxpacket;
2006: packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
2007: packet_put_int(c->remote_id);
2008: packet_put_int(SSH2_EXTENDED_DATA_STDERR);
2009: packet_put_string(buffer_ptr(&c->extended), len);
2010: packet_send();
2011: buffer_consume(&c->extended, len);
2012: c->remote_window -= len;
1.93 markus 2013: debug2("channel %d: sent ext data %d", c->self, len);
1.44 markus 2014: }
1.25 markus 2015: }
1.1 deraadt 2016: }
2017:
1.121 markus 2018:
2019: /* -- protocol input */
1.249 djm 2020:
2021: /* ARGSUSED */
1.49 markus 2022: void
1.154 markus 2023: channel_input_data(int type, u_int32_t seq, void *ctxt)
1.1 deraadt 2024: {
1.37 markus 2025: int id;
1.25 markus 2026: char *data;
1.77 markus 2027: u_int data_len;
1.41 markus 2028: Channel *c;
1.25 markus 2029:
2030: /* Get the channel number and verify it. */
1.37 markus 2031: id = packet_get_int();
1.41 markus 2032: c = channel_lookup(id);
2033: if (c == NULL)
1.37 markus 2034: packet_disconnect("Received data for nonexistent channel %d.", id);
1.25 markus 2035:
2036: /* Ignore any data for non-open channels (might happen on close) */
1.41 markus 2037: if (c->type != SSH_CHANNEL_OPEN &&
2038: c->type != SSH_CHANNEL_X11_OPEN)
1.37 markus 2039: return;
2040:
1.25 markus 2041: /* Get the data. */
1.274 markus 2042: data = packet_get_string_ptr(&data_len);
1.200 markus 2043:
2044: /*
2045: * Ignore data for protocol > 1.3 if output end is no longer open.
2046: * For protocol 2 the sending side is reducing its window as it sends
2047: * data, so we must 'fake' consumption of the data in order to ensure
2048: * that window updates are sent back. Otherwise the connection might
2049: * deadlock.
2050: */
2051: if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) {
2052: if (compat20) {
2053: c->local_window -= data_len;
2054: c->local_consumed += data_len;
2055: }
2056: return;
2057: }
1.41 markus 2058:
1.143 deraadt 2059: if (compat20) {
1.44 markus 2060: if (data_len > c->local_maxpacket) {
1.188 itojun 2061: logit("channel %d: rcvd big packet %d, maxpack %d",
1.44 markus 2062: c->self, data_len, c->local_maxpacket);
2063: }
2064: if (data_len > c->local_window) {
1.188 itojun 2065: logit("channel %d: rcvd too much data %d, win %d",
1.44 markus 2066: c->self, data_len, c->local_window);
2067: return;
2068: }
2069: c->local_window -= data_len;
2070: }
1.228 reyk 2071: if (c->datagram)
2072: buffer_put_string(&c->output, data, data_len);
2073: else
2074: buffer_append(&c->output, data, data_len);
1.274 markus 2075: packet_check_eom();
1.1 deraadt 2076: }
1.121 markus 2077:
1.249 djm 2078: /* ARGSUSED */
1.49 markus 2079: void
1.154 markus 2080: channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
1.44 markus 2081: {
2082: int id;
2083: char *data;
1.177 markus 2084: u_int data_len, tcode;
1.44 markus 2085: Channel *c;
2086:
2087: /* Get the channel number and verify it. */
2088: id = packet_get_int();
2089: c = channel_lookup(id);
2090:
2091: if (c == NULL)
2092: packet_disconnect("Received extended_data for bad channel %d.", id);
2093: if (c->type != SSH_CHANNEL_OPEN) {
1.188 itojun 2094: logit("channel %d: ext data for non open", id);
1.44 markus 2095: return;
1.172 markus 2096: }
2097: if (c->flags & CHAN_EOF_RCVD) {
2098: if (datafellows & SSH_BUG_EXTEOF)
2099: debug("channel %d: accepting ext data after eof", id);
2100: else
2101: packet_disconnect("Received extended_data after EOF "
2102: "on channel %d.", id);
1.44 markus 2103: }
2104: tcode = packet_get_int();
2105: if (c->efd == -1 ||
2106: c->extended_usage != CHAN_EXTENDED_WRITE ||
2107: tcode != SSH2_EXTENDED_DATA_STDERR) {
1.188 itojun 2108: logit("channel %d: bad ext data", c->self);
1.44 markus 2109: return;
2110: }
2111: data = packet_get_string(&data_len);
1.152 markus 2112: packet_check_eom();
1.44 markus 2113: if (data_len > c->local_window) {
1.188 itojun 2114: logit("channel %d: rcvd too much extended_data %d, win %d",
1.44 markus 2115: c->self, data_len, c->local_window);
2116: xfree(data);
2117: return;
2118: }
1.70 markus 2119: debug2("channel %d: rcvd ext data %d", c->self, data_len);
1.44 markus 2120: c->local_window -= data_len;
2121: buffer_append(&c->extended, data, data_len);
2122: xfree(data);
2123: }
2124:
1.249 djm 2125: /* ARGSUSED */
1.49 markus 2126: void
1.154 markus 2127: channel_input_ieof(int type, u_int32_t seq, void *ctxt)
1.41 markus 2128: {
2129: int id;
2130: Channel *c;
2131:
2132: id = packet_get_int();
1.152 markus 2133: packet_check_eom();
1.41 markus 2134: c = channel_lookup(id);
2135: if (c == NULL)
2136: packet_disconnect("Received ieof for nonexistent channel %d.", id);
2137: chan_rcvd_ieof(c);
1.133 markus 2138:
2139: /* XXX force input close */
1.156 markus 2140: if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
1.133 markus 2141: debug("channel %d: FORCE input drain", c->self);
2142: c->istate = CHAN_INPUT_WAIT_DRAIN;
1.161 markus 2143: if (buffer_len(&c->input) == 0)
2144: chan_ibuf_empty(c);
1.133 markus 2145: }
2146:
1.41 markus 2147: }
1.1 deraadt 2148:
1.249 djm 2149: /* ARGSUSED */
1.49 markus 2150: void
1.154 markus 2151: channel_input_close(int type, u_int32_t seq, void *ctxt)
1.1 deraadt 2152: {
1.41 markus 2153: int id;
2154: Channel *c;
1.1 deraadt 2155:
1.41 markus 2156: id = packet_get_int();
1.152 markus 2157: packet_check_eom();
1.41 markus 2158: c = channel_lookup(id);
2159: if (c == NULL)
2160: packet_disconnect("Received close for nonexistent channel %d.", id);
1.27 markus 2161:
2162: /*
2163: * Send a confirmation that we have closed the channel and no more
2164: * data is coming for it.
2165: */
1.25 markus 2166: packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
1.41 markus 2167: packet_put_int(c->remote_id);
1.25 markus 2168: packet_send();
2169:
1.27 markus 2170: /*
2171: * If the channel is in closed state, we have sent a close request,
2172: * and the other side will eventually respond with a confirmation.
2173: * Thus, we cannot free the channel here, because then there would be
2174: * no-one to receive the confirmation. The channel gets freed when
2175: * the confirmation arrives.
2176: */
1.41 markus 2177: if (c->type != SSH_CHANNEL_CLOSED) {
1.27 markus 2178: /*
2179: * Not a closed channel - mark it as draining, which will
2180: * cause it to be freed later.
2181: */
1.158 markus 2182: buffer_clear(&c->input);
1.41 markus 2183: c->type = SSH_CHANNEL_OUTPUT_DRAINING;
1.25 markus 2184: }
1.1 deraadt 2185: }
2186:
1.41 markus 2187: /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
1.249 djm 2188: /* ARGSUSED */
1.49 markus 2189: void
1.154 markus 2190: channel_input_oclose(int type, u_int32_t seq, void *ctxt)
1.41 markus 2191: {
2192: int id = packet_get_int();
2193: Channel *c = channel_lookup(id);
1.151 markus 2194:
1.152 markus 2195: packet_check_eom();
1.41 markus 2196: if (c == NULL)
2197: packet_disconnect("Received oclose for nonexistent channel %d.", id);
2198: chan_rcvd_oclose(c);
2199: }
1.1 deraadt 2200:
1.249 djm 2201: /* ARGSUSED */
1.49 markus 2202: void
1.154 markus 2203: channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
1.1 deraadt 2204: {
1.41 markus 2205: int id = packet_get_int();
2206: Channel *c = channel_lookup(id);
1.1 deraadt 2207:
1.152 markus 2208: packet_check_eom();
1.41 markus 2209: if (c == NULL)
2210: packet_disconnect("Received close confirmation for "
2211: "out-of-range channel %d.", id);
2212: if (c->type != SSH_CHANNEL_CLOSED)
2213: packet_disconnect("Received close confirmation for "
2214: "non-closed channel %d (type %d).", id, c->type);
1.113 markus 2215: channel_free(c);
1.1 deraadt 2216: }
2217:
1.249 djm 2218: /* ARGSUSED */
1.49 markus 2219: void
1.154 markus 2220: channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
1.1 deraadt 2221: {
1.41 markus 2222: int id, remote_id;
2223: Channel *c;
1.1 deraadt 2224:
1.41 markus 2225: id = packet_get_int();
2226: c = channel_lookup(id);
1.25 markus 2227:
1.41 markus 2228: if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2229: packet_disconnect("Received open confirmation for "
2230: "non-opening channel %d.", id);
2231: remote_id = packet_get_int();
1.27 markus 2232: /* Record the remote channel number and mark that the channel is now open. */
1.41 markus 2233: c->remote_id = remote_id;
2234: c->type = SSH_CHANNEL_OPEN;
1.44 markus 2235:
2236: if (compat20) {
2237: c->remote_window = packet_get_int();
2238: c->remote_maxpacket = packet_get_int();
1.275 djm 2239: if (c->open_confirm) {
1.70 markus 2240: debug2("callback start");
1.275 djm 2241: c->open_confirm(c->self, c->open_confirm_ctx);
1.70 markus 2242: debug2("callback done");
1.44 markus 2243: }
1.194 markus 2244: debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
1.44 markus 2245: c->remote_window, c->remote_maxpacket);
2246: }
1.152 markus 2247: packet_check_eom();
1.1 deraadt 2248: }
2249:
1.127 itojun 2250: static char *
1.114 markus 2251: reason2txt(int reason)
2252: {
1.143 deraadt 2253: switch (reason) {
1.114 markus 2254: case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
2255: return "administratively prohibited";
2256: case SSH2_OPEN_CONNECT_FAILED:
2257: return "connect failed";
2258: case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
2259: return "unknown channel type";
2260: case SSH2_OPEN_RESOURCE_SHORTAGE:
2261: return "resource shortage";
2262: }
1.117 stevesk 2263: return "unknown reason";
1.114 markus 2264: }
2265:
1.249 djm 2266: /* ARGSUSED */
1.49 markus 2267: void
1.154 markus 2268: channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
1.1 deraadt 2269: {
1.86 markus 2270: int id, reason;
2271: char *msg = NULL, *lang = NULL;
1.41 markus 2272: Channel *c;
2273:
2274: id = packet_get_int();
2275: c = channel_lookup(id);
1.25 markus 2276:
1.41 markus 2277: if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2278: packet_disconnect("Received open failure for "
2279: "non-opening channel %d.", id);
1.44 markus 2280: if (compat20) {
1.86 markus 2281: reason = packet_get_int();
1.110 markus 2282: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.86 markus 2283: msg = packet_get_string(NULL);
2284: lang = packet_get_string(NULL);
2285: }
1.188 itojun 2286: logit("channel %d: open failed: %s%s%s", id,
1.114 markus 2287: reason2txt(reason), msg ? ": ": "", msg ? msg : "");
1.86 markus 2288: if (msg != NULL)
2289: xfree(msg);
2290: if (lang != NULL)
2291: xfree(lang);
1.44 markus 2292: }
1.152 markus 2293: packet_check_eom();
1.25 markus 2294: /* Free the channel. This will also close the socket. */
1.113 markus 2295: channel_free(c);
1.44 markus 2296: }
2297:
1.249 djm 2298: /* ARGSUSED */
1.121 markus 2299: void
1.154 markus 2300: channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
1.121 markus 2301: {
2302: Channel *c;
1.178 markus 2303: int id;
2304: u_int adjust;
1.121 markus 2305:
2306: if (!compat20)
2307: return;
2308:
2309: /* Get the channel number and verify it. */
2310: id = packet_get_int();
2311: c = channel_lookup(id);
1.1 deraadt 2312:
1.229 markus 2313: if (c == NULL) {
2314: logit("Received window adjust for non-open channel %d.", id);
1.121 markus 2315: return;
2316: }
2317: adjust = packet_get_int();
1.152 markus 2318: packet_check_eom();
1.178 markus 2319: debug2("channel %d: rcvd adjust %u", id, adjust);
1.121 markus 2320: c->remote_window += adjust;
2321: }
1.1 deraadt 2322:
1.249 djm 2323: /* ARGSUSED */
1.121 markus 2324: void
1.154 markus 2325: channel_input_port_open(int type, u_int32_t seq, void *ctxt)
1.1 deraadt 2326: {
1.121 markus 2327: Channel *c = NULL;
2328: u_short host_port;
2329: char *host, *originator_string;
1.276 ! djm 2330: int remote_id;
1.121 markus 2331:
2332: remote_id = packet_get_int();
2333: host = packet_get_string(NULL);
2334: host_port = packet_get_int();
1.25 markus 2335:
1.121 markus 2336: if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2337: originator_string = packet_get_string(NULL);
2338: } else {
2339: originator_string = xstrdup("unknown (remote did not supply name)");
2340: }
1.152 markus 2341: packet_check_eom();
1.276 ! djm 2342: c = channel_connect_to(host, host_port,
! 2343: "connected socket", originator_string);
1.190 markus 2344: xfree(originator_string);
1.276 ! djm 2345: xfree(host);
1.121 markus 2346: if (c == NULL) {
2347: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2348: packet_put_int(remote_id);
2349: packet_send();
1.276 ! djm 2350: } else
! 2351: c->remote_id = remote_id;
1.1 deraadt 2352: }
2353:
1.275 djm 2354: /* ARGSUSED */
2355: void
2356: channel_input_status_confirm(int type, u_int32_t seq, void *ctxt)
2357: {
2358: Channel *c;
2359: struct channel_confirm *cc;
2360: int remote_id;
2361:
2362: /* Reset keepalive timeout */
2363: keep_alive_timeouts = 0;
2364:
2365: remote_id = packet_get_int();
2366: packet_check_eom();
2367:
2368: debug2("channel_input_confirm: type %d id %d", type, remote_id);
2369:
2370: if ((c = channel_lookup(remote_id)) == NULL) {
2371: logit("channel_input_success_failure: %d: unknown", remote_id);
2372: return;
2373: }
2374: ;
2375: if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL)
2376: return;
2377: cc->cb(type, c, cc->ctx);
2378: TAILQ_REMOVE(&c->status_confirms, cc, entry);
2379: bzero(cc, sizeof(*cc));
2380: xfree(cc);
2381: }
1.121 markus 2382:
2383: /* -- tcp forwarding */
1.135 markus 2384:
2385: void
2386: channel_set_af(int af)
2387: {
2388: IPv4or6 = af;
2389: }
1.121 markus 2390:
1.160 markus 2391: static int
2392: channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port,
2393: const char *host_to_connect, u_short port_to_connect, int gateway_ports)
1.25 markus 2394: {
1.113 markus 2395: Channel *c;
1.226 djm 2396: int sock, r, success = 0, wildcard = 0, is_client;
1.35 markus 2397: struct addrinfo hints, *ai, *aitop;
1.212 djm 2398: const char *host, *addr;
1.35 markus 2399: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
1.25 markus 2400:
1.160 markus 2401: host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2402: listen_addr : host_to_connect;
1.212 djm 2403: is_client = (type == SSH_CHANNEL_PORT_LISTENER);
1.87 markus 2404:
1.160 markus 2405: if (host == NULL) {
2406: error("No forward host name.");
1.218 markus 2407: return 0;
1.73 markus 2408: }
1.113 markus 2409: if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
1.87 markus 2410: error("Forward host name too long.");
1.218 markus 2411: return 0;
1.87 markus 2412: }
1.25 markus 2413:
1.28 markus 2414: /*
1.212 djm 2415: * Determine whether or not a port forward listens to loopback,
1.213 deraadt 2416: * specified address or wildcard. On the client, a specified bind
2417: * address will always override gateway_ports. On the server, a
2418: * gateway_ports of 1 (``yes'') will override the client's
2419: * specification and force a wildcard bind, whereas a value of 2
2420: * (``clientspecified'') will bind to whatever address the client
1.212 djm 2421: * asked for.
2422: *
2423: * Special-case listen_addrs are:
2424: *
2425: * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR
2426: * "" (empty string), "*" -> wildcard v4/v6
2427: * "localhost" -> loopback v4/v6
2428: */
2429: addr = NULL;
2430: if (listen_addr == NULL) {
2431: /* No address specified: default to gateway_ports setting */
2432: if (gateway_ports)
2433: wildcard = 1;
2434: } else if (gateway_ports || is_client) {
2435: if (((datafellows & SSH_OLD_FORWARD_ADDR) &&
1.272 djm 2436: strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) ||
1.212 djm 2437: *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 ||
2438: (!is_client && gateway_ports == 1))
2439: wildcard = 1;
2440: else if (strcmp(listen_addr, "localhost") != 0)
2441: addr = listen_addr;
2442: }
2443:
2444: debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s",
2445: type, wildcard, (addr == NULL) ? "NULL" : addr);
2446:
2447: /*
1.35 markus 2448: * getaddrinfo returns a loopback address if the hostname is
2449: * set to NULL and hints.ai_flags is not AI_PASSIVE
1.28 markus 2450: */
1.35 markus 2451: memset(&hints, 0, sizeof(hints));
2452: hints.ai_family = IPv4or6;
1.212 djm 2453: hints.ai_flags = wildcard ? AI_PASSIVE : 0;
1.35 markus 2454: hints.ai_socktype = SOCK_STREAM;
1.73 markus 2455: snprintf(strport, sizeof strport, "%d", listen_port);
1.212 djm 2456: if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) {
2457: if (addr == NULL) {
2458: /* This really shouldn't happen */
2459: packet_disconnect("getaddrinfo: fatal error: %s",
1.271 dtucker 2460: ssh_gai_strerror(r));
1.212 djm 2461: } else {
1.218 markus 2462: error("channel_setup_fwd_listener: "
1.271 dtucker 2463: "getaddrinfo(%.64s): %s", addr,
2464: ssh_gai_strerror(r));
1.212 djm 2465: }
1.218 markus 2466: return 0;
1.212 djm 2467: }
1.35 markus 2468:
2469: for (ai = aitop; ai; ai = ai->ai_next) {
2470: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2471: continue;
2472: if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2473: strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1.160 markus 2474: error("channel_setup_fwd_listener: getnameinfo failed");
1.35 markus 2475: continue;
2476: }
2477: /* Create a port to listen for the host. */
1.189 markus 2478: sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.35 markus 2479: if (sock < 0) {
2480: /* this is no error since kernel may not support ipv6 */
2481: verbose("socket: %.100s", strerror(errno));
2482: continue;
2483: }
1.226 djm 2484:
2485: channel_set_reuseaddr(sock);
1.182 stevesk 2486:
1.35 markus 2487: debug("Local forwarding listening on %s port %s.", ntop, strport);
2488:
2489: /* Bind the socket to the address. */
2490: if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2491: /* address can be in use ipv6 address is already bound */
2492: verbose("bind: %.100s", strerror(errno));
2493: close(sock);
2494: continue;
2495: }
2496: /* Start listening for connections on the socket. */
1.199 markus 2497: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.35 markus 2498: error("listen: %.100s", strerror(errno));
2499: close(sock);
2500: continue;
2501: }
2502: /* Allocate a channel number for the socket. */
1.121 markus 2503: c = channel_new("port listener", type, sock, sock, -1,
1.51 markus 2504: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1.190 markus 2505: 0, "port listener", 1);
1.113 markus 2506: strlcpy(c->path, host, sizeof(c->path));
2507: c->host_port = port_to_connect;
2508: c->listening_port = listen_port;
1.35 markus 2509: success = 1;
2510: }
2511: if (success == 0)
1.160 markus 2512: error("channel_setup_fwd_listener: cannot listen to port: %d",
1.87 markus 2513: listen_port);
1.35 markus 2514: freeaddrinfo(aitop);
1.87 markus 2515: return success;
1.25 markus 2516: }
1.1 deraadt 2517:
1.202 djm 2518: int
2519: channel_cancel_rport_listener(const char *host, u_short port)
2520: {
1.209 avsm 2521: u_int i;
2522: int found = 0;
1.202 djm 2523:
1.213 deraadt 2524: for (i = 0; i < channels_alloc; i++) {
1.202 djm 2525: Channel *c = channels[i];
2526:
2527: if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER &&
2528: strncmp(c->path, host, sizeof(c->path)) == 0 &&
1.208 deraadt 2529: c->listening_port == port) {
1.210 djm 2530: debug2("%s: close channel %d", __func__, i);
1.202 djm 2531: channel_free(c);
2532: found = 1;
2533: }
2534: }
2535:
2536: return (found);
2537: }
2538:
1.160 markus 2539: /* protocol local port fwd, used by ssh (and sshd in v1) */
2540: int
1.212 djm 2541: channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port,
1.160 markus 2542: const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2543: {
2544: return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
1.212 djm 2545: listen_host, listen_port, host_to_connect, port_to_connect,
2546: gateway_ports);
1.160 markus 2547: }
2548:
2549: /* protocol v2 remote port fwd, used by sshd */
2550: int
2551: channel_setup_remote_fwd_listener(const char *listen_address,
2552: u_short listen_port, int gateway_ports)
2553: {
2554: return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
2555: listen_address, listen_port, NULL, 0, gateway_ports);
2556: }
2557:
1.27 markus 2558: /*
2559: * Initiate forwarding of connections to port "port" on remote host through
2560: * the secure channel to host:port from local side.
2561: */
1.1 deraadt 2562:
1.253 markus 2563: int
1.212 djm 2564: channel_request_remote_forwarding(const char *listen_host, u_short listen_port,
1.73 markus 2565: const char *host_to_connect, u_short port_to_connect)
1.25 markus 2566: {
1.153 markus 2567: int type, success = 0;
1.73 markus 2568:
1.25 markus 2569: /* Record locally that connection to this host/port is permitted. */
2570: if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2571: fatal("channel_request_remote_forwarding: too many forwards");
2572:
2573: /* Send the forward request to the remote side. */
1.44 markus 2574: if (compat20) {
1.212 djm 2575: const char *address_to_bind;
1.267 djm 2576: if (listen_host == NULL) {
2577: if (datafellows & SSH_BUG_RFWD_ADDR)
2578: address_to_bind = "127.0.0.1";
2579: else
2580: address_to_bind = "localhost";
2581: } else if (*listen_host == '\0' ||
2582: strcmp(listen_host, "*") == 0) {
2583: if (datafellows & SSH_BUG_RFWD_ADDR)
2584: address_to_bind = "0.0.0.0";
2585: else
2586: address_to_bind = "";
2587: } else
1.212 djm 2588: address_to_bind = listen_host;
2589:
1.44 markus 2590: packet_start(SSH2_MSG_GLOBAL_REQUEST);
2591: packet_put_cstring("tcpip-forward");
1.173 markus 2592: packet_put_char(1); /* boolean: want reply */
1.44 markus 2593: packet_put_cstring(address_to_bind);
2594: packet_put_int(listen_port);
1.73 markus 2595: packet_send();
2596: packet_write_wait();
2597: /* Assume that server accepts the request */
2598: success = 1;
1.44 markus 2599: } else {
2600: packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
1.50 markus 2601: packet_put_int(listen_port);
2602: packet_put_cstring(host_to_connect);
1.44 markus 2603: packet_put_int(port_to_connect);
2604: packet_send();
2605: packet_write_wait();
1.73 markus 2606:
2607: /* Wait for response from the remote side. */
1.153 markus 2608: type = packet_read();
1.73 markus 2609: switch (type) {
2610: case SSH_SMSG_SUCCESS:
2611: success = 1;
2612: break;
2613: case SSH_SMSG_FAILURE:
2614: break;
2615: default:
2616: /* Unknown packet */
2617: packet_disconnect("Protocol error for port forward request:"
2618: "received packet type %d.", type);
2619: }
2620: }
2621: if (success) {
2622: permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2623: permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2624: permitted_opens[num_permitted_opens].listen_port = listen_port;
2625: num_permitted_opens++;
1.44 markus 2626: }
1.253 markus 2627: return (success ? 0 : -1);
1.1 deraadt 2628: }
2629:
1.27 markus 2630: /*
1.208 deraadt 2631: * Request cancellation of remote forwarding of connection host:port from
1.202 djm 2632: * local side.
2633: */
2634: void
1.212 djm 2635: channel_request_rforward_cancel(const char *host, u_short port)
1.202 djm 2636: {
2637: int i;
2638:
2639: if (!compat20)
2640: return;
2641:
2642: for (i = 0; i < num_permitted_opens; i++) {
1.208 deraadt 2643: if (permitted_opens[i].host_to_connect != NULL &&
1.202 djm 2644: permitted_opens[i].listen_port == port)
2645: break;
2646: }
2647: if (i >= num_permitted_opens) {
2648: debug("%s: requested forward not found", __func__);
2649: return;
2650: }
2651: packet_start(SSH2_MSG_GLOBAL_REQUEST);
2652: packet_put_cstring("cancel-tcpip-forward");
2653: packet_put_char(0);
1.212 djm 2654: packet_put_cstring(host == NULL ? "" : host);
1.202 djm 2655: packet_put_int(port);
2656: packet_send();
2657:
2658: permitted_opens[i].listen_port = 0;
2659: permitted_opens[i].port_to_connect = 0;
1.227 stevesk 2660: xfree(permitted_opens[i].host_to_connect);
1.202 djm 2661: permitted_opens[i].host_to_connect = NULL;
2662: }
2663:
2664: /*
1.27 markus 2665: * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2666: * listening for the port, and sends back a success reply (or disconnect
1.253 markus 2667: * message if there was an error).
1.27 markus 2668: */
1.253 markus 2669: int
1.56 markus 2670: channel_input_port_forward_request(int is_root, int gateway_ports)
1.1 deraadt 2671: {
1.31 markus 2672: u_short port, host_port;
1.253 markus 2673: int success = 0;
1.25 markus 2674: char *hostname;
1.1 deraadt 2675:
1.25 markus 2676: /* Get arguments from the packet. */
2677: port = packet_get_int();
2678: hostname = packet_get_string(NULL);
2679: host_port = packet_get_int();
2680:
1.27 markus 2681: /*
2682: * Check that an unprivileged user is not trying to forward a
2683: * privileged port.
2684: */
1.25 markus 2685: if (port < IPPORT_RESERVED && !is_root)
1.192 markus 2686: packet_disconnect(
2687: "Requested forwarding of port %d but user is not root.",
2688: port);
2689: if (host_port == 0)
2690: packet_disconnect("Dynamic forwarding denied.");
2691:
1.73 markus 2692: /* Initiate forwarding */
1.253 markus 2693: success = channel_setup_local_fwd_listener(NULL, port, hostname,
1.212 djm 2694: host_port, gateway_ports);
1.25 markus 2695:
2696: /* Free the argument string. */
2697: xfree(hostname);
1.253 markus 2698:
2699: return (success ? 0 : -1);
1.1 deraadt 2700: }
2701:
1.99 markus 2702: /*
2703: * Permits opening to any host/port if permitted_opens[] is empty. This is
2704: * usually called by the server, because the user could connect to any port
2705: * anyway, and the server has no way to know but to trust the client anyway.
2706: */
2707: void
1.142 itojun 2708: channel_permit_all_opens(void)
1.99 markus 2709: {
2710: if (num_permitted_opens == 0)
2711: all_opens_permitted = 1;
2712: }
2713:
1.101 markus 2714: void
1.99 markus 2715: channel_add_permitted_opens(char *host, int port)
2716: {
2717: if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
1.253 markus 2718: fatal("channel_add_permitted_opens: too many forwards");
1.99 markus 2719: debug("allow port forwarding to host %s port %d", host, port);
2720:
2721: permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2722: permitted_opens[num_permitted_opens].port_to_connect = port;
2723: num_permitted_opens++;
2724:
2725: all_opens_permitted = 0;
2726: }
2727:
1.258 dtucker 2728: int
1.257 dtucker 2729: channel_add_adm_permitted_opens(char *host, int port)
2730: {
2731: if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2732: fatal("channel_add_adm_permitted_opens: too many forwards");
1.258 dtucker 2733: debug("config allows port forwarding to host %s port %d", host, port);
1.257 dtucker 2734:
2735: permitted_adm_opens[num_adm_permitted_opens].host_to_connect
2736: = xstrdup(host);
2737: permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port;
1.258 dtucker 2738: return ++num_adm_permitted_opens;
1.257 dtucker 2739: }
2740:
2741: void
1.99 markus 2742: channel_clear_permitted_opens(void)
2743: {
2744: int i;
2745:
2746: for (i = 0; i < num_permitted_opens; i++)
1.202 djm 2747: if (permitted_opens[i].host_to_connect != NULL)
2748: xfree(permitted_opens[i].host_to_connect);
1.99 markus 2749: num_permitted_opens = 0;
1.257 dtucker 2750: }
2751:
2752: void
2753: channel_clear_adm_permitted_opens(void)
2754: {
2755: int i;
1.99 markus 2756:
1.257 dtucker 2757: for (i = 0; i < num_adm_permitted_opens; i++)
2758: if (permitted_adm_opens[i].host_to_connect != NULL)
2759: xfree(permitted_adm_opens[i].host_to_connect);
2760: num_adm_permitted_opens = 0;
1.99 markus 2761: }
2762:
1.276 ! djm 2763: /* Try to start non-blocking connect to next host in cctx list */
1.127 itojun 2764: static int
1.276 ! djm 2765: connect_next(struct channel_connect *cctx)
1.41 markus 2766: {
1.276 ! djm 2767: int sock, saved_errno;
1.41 markus 2768: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2769:
1.276 ! djm 2770: for (; cctx->ai; cctx->ai = cctx->ai->ai_next) {
! 2771: if (cctx->ai->ai_family != AF_INET &&
! 2772: cctx->ai->ai_family != AF_INET6)
1.41 markus 2773: continue;
1.276 ! djm 2774: if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen,
! 2775: ntop, sizeof(ntop), strport, sizeof(strport),
! 2776: NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
! 2777: error("connect_next: getnameinfo failed");
1.41 markus 2778: continue;
2779: }
1.276 ! djm 2780: if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype,
! 2781: cctx->ai->ai_protocol)) == -1) {
! 2782: if (cctx->ai->ai_next == NULL)
1.186 djm 2783: error("socket: %.100s", strerror(errno));
2784: else
2785: verbose("socket: %.100s", strerror(errno));
1.41 markus 2786: continue;
2787: }
1.205 djm 2788: if (set_nonblock(sock) == -1)
2789: fatal("%s: set_nonblock(%d)", __func__, sock);
1.276 ! djm 2790: if (connect(sock, cctx->ai->ai_addr,
! 2791: cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) {
! 2792: debug("connect_next: host %.100s ([%.100s]:%s): "
! 2793: "%.100s", cctx->host, ntop, strport,
1.41 markus 2794: strerror(errno));
1.276 ! djm 2795: saved_errno = errno;
1.41 markus 2796: close(sock);
1.276 ! djm 2797: errno = saved_errno;
1.89 stevesk 2798: continue; /* fail -- try next */
1.41 markus 2799: }
1.276 ! djm 2800: debug("connect_next: host %.100s ([%.100s]:%s) "
! 2801: "in progress, fd=%d", cctx->host, ntop, strport, sock);
! 2802: cctx->ai = cctx->ai->ai_next;
! 2803: set_nodelay(sock);
! 2804: return sock;
! 2805: }
! 2806: return -1;
! 2807: }
1.41 markus 2808:
1.276 ! djm 2809: static void
! 2810: channel_connect_ctx_free(struct channel_connect *cctx)
! 2811: {
! 2812: xfree(cctx->host);
! 2813: if (cctx->aitop)
! 2814: freeaddrinfo(cctx->aitop);
! 2815: bzero(cctx, sizeof(*cctx));
! 2816: cctx->host = NULL;
! 2817: cctx->ai = cctx->aitop = NULL;
! 2818: }
! 2819:
! 2820: /* Return CONNECTING channel to remote host, port */
! 2821: static Channel *
! 2822: connect_to(const char *host, u_short port, char *ctype, char *rname)
! 2823: {
! 2824: struct addrinfo hints;
! 2825: int gaierr;
! 2826: int sock = -1;
! 2827: char strport[NI_MAXSERV];
! 2828: struct channel_connect cctx;
! 2829: Channel *c;
! 2830:
! 2831: memset(&hints, 0, sizeof(hints));
! 2832: hints.ai_family = IPv4or6;
! 2833: hints.ai_socktype = SOCK_STREAM;
! 2834: snprintf(strport, sizeof strport, "%d", port);
! 2835: if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) {
! 2836: error("connect_to %.100s: unknown host (%s)", host,
! 2837: ssh_gai_strerror(gaierr));
! 2838: return NULL;
1.41 markus 2839: }
1.276 ! djm 2840:
! 2841: cctx.host = xstrdup(host);
! 2842: cctx.port = port;
! 2843: cctx.ai = cctx.aitop;
! 2844:
! 2845: if ((sock = connect_next(&cctx)) == -1) {
! 2846: error("connect to %.100s port %d failed: %s",
! 2847: host, port, strerror(errno));
! 2848: channel_connect_ctx_free(&cctx);
! 2849: return NULL;
1.41 markus 2850: }
1.276 ! djm 2851: c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1,
! 2852: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1);
! 2853: c->connect_ctx = cctx;
! 2854: return c;
1.41 markus 2855: }
1.99 markus 2856:
1.276 ! djm 2857: Channel *
! 2858: channel_connect_by_listen_address(u_short listen_port, char *ctype, char *rname)
1.73 markus 2859: {
2860: int i;
1.99 markus 2861:
1.276 ! djm 2862: for (i = 0; i < num_permitted_opens; i++) {
1.202 djm 2863: if (permitted_opens[i].host_to_connect != NULL &&
1.276 ! djm 2864: permitted_opens[i].listen_port == listen_port) {
1.99 markus 2865: return connect_to(
1.73 markus 2866: permitted_opens[i].host_to_connect,
1.276 ! djm 2867: permitted_opens[i].port_to_connect, ctype, rname);
! 2868: }
! 2869: }
1.74 markus 2870: error("WARNING: Server requests forwarding for unknown listen_port %d",
2871: listen_port);
1.276 ! djm 2872: return NULL;
1.73 markus 2873: }
2874:
1.99 markus 2875: /* Check if connecting to that port is permitted and connect. */
1.276 ! djm 2876: Channel *
! 2877: channel_connect_to(const char *host, u_short port, char *ctype, char *rname)
1.99 markus 2878: {
1.257 dtucker 2879: int i, permit, permit_adm = 1;
1.99 markus 2880:
2881: permit = all_opens_permitted;
2882: if (!permit) {
2883: for (i = 0; i < num_permitted_opens; i++)
1.202 djm 2884: if (permitted_opens[i].host_to_connect != NULL &&
2885: permitted_opens[i].port_to_connect == port &&
1.99 markus 2886: strcmp(permitted_opens[i].host_to_connect, host) == 0)
2887: permit = 1;
1.257 dtucker 2888: }
1.99 markus 2889:
1.257 dtucker 2890: if (num_adm_permitted_opens > 0) {
2891: permit_adm = 0;
2892: for (i = 0; i < num_adm_permitted_opens; i++)
2893: if (permitted_adm_opens[i].host_to_connect != NULL &&
2894: permitted_adm_opens[i].port_to_connect == port &&
2895: strcmp(permitted_adm_opens[i].host_to_connect, host)
2896: == 0)
2897: permit_adm = 1;
1.99 markus 2898: }
1.257 dtucker 2899:
2900: if (!permit || !permit_adm) {
1.188 itojun 2901: logit("Received request to connect to host %.100s port %d, "
1.99 markus 2902: "but the request was denied.", host, port);
1.276 ! djm 2903: return NULL;
1.99 markus 2904: }
1.276 ! djm 2905: return connect_to(host, port, ctype, rname);
1.204 djm 2906: }
2907:
2908: void
2909: channel_send_window_changes(void)
2910: {
1.209 avsm 2911: u_int i;
1.204 djm 2912: struct winsize ws;
2913:
2914: for (i = 0; i < channels_alloc; i++) {
1.213 deraadt 2915: if (channels[i] == NULL || !channels[i]->client_tty ||
1.204 djm 2916: channels[i]->type != SSH_CHANNEL_OPEN)
2917: continue;
2918: if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0)
2919: continue;
2920: channel_request_start(i, "window-change", 0);
1.238 deraadt 2921: packet_put_int((u_int)ws.ws_col);
2922: packet_put_int((u_int)ws.ws_row);
2923: packet_put_int((u_int)ws.ws_xpixel);
2924: packet_put_int((u_int)ws.ws_ypixel);
1.204 djm 2925: packet_send();
2926: }
1.99 markus 2927: }
2928:
1.121 markus 2929: /* -- X11 forwarding */
1.1 deraadt 2930:
1.27 markus 2931: /*
2932: * Creates an internet domain socket for listening for X11 connections.
1.176 deraadt 2933: * Returns 0 and a suitable display number for the DISPLAY variable
2934: * stored in display_numberp , or -1 if an error occurs.
1.27 markus 2935: */
1.141 stevesk 2936: int
1.163 stevesk 2937: x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
1.222 djm 2938: int single_connection, u_int *display_numberp, int **chanids)
1.1 deraadt 2939: {
1.149 markus 2940: Channel *nc = NULL;
1.31 markus 2941: int display_number, sock;
2942: u_short port;
1.35 markus 2943: struct addrinfo hints, *ai, *aitop;
2944: char strport[NI_MAXSERV];
2945: int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
1.25 markus 2946:
1.224 markus 2947: if (chanids == NULL)
2948: return -1;
2949:
1.33 markus 2950: for (display_number = x11_display_offset;
1.148 deraadt 2951: display_number < MAX_DISPLAYS;
2952: display_number++) {
1.25 markus 2953: port = 6000 + display_number;
1.35 markus 2954: memset(&hints, 0, sizeof(hints));
2955: hints.ai_family = IPv4or6;
1.163 stevesk 2956: hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
1.35 markus 2957: hints.ai_socktype = SOCK_STREAM;
2958: snprintf(strport, sizeof strport, "%d", port);
2959: if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
1.271 dtucker 2960: error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr));
1.141 stevesk 2961: return -1;
1.25 markus 2962: }
1.35 markus 2963: for (ai = aitop; ai; ai = ai->ai_next) {
2964: if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2965: continue;
1.189 markus 2966: sock = socket(ai->ai_family, ai->ai_socktype,
2967: ai->ai_protocol);
1.35 markus 2968: if (sock < 0) {
2969: error("socket: %.100s", strerror(errno));
1.203 markus 2970: freeaddrinfo(aitop);
1.141 stevesk 2971: return -1;
1.35 markus 2972: }
1.226 djm 2973: channel_set_reuseaddr(sock);
1.35 markus 2974: if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1.194 markus 2975: debug2("bind port %d: %.100s", port, strerror(errno));
1.35 markus 2976: close(sock);
1.183 itojun 2977:
1.35 markus 2978: for (n = 0; n < num_socks; n++) {
2979: close(socks[n]);
2980: }
2981: num_socks = 0;
2982: break;
2983: }
2984: socks[num_socks++] = sock;
2985: if (num_socks == NUM_SOCKS)
2986: break;
1.25 markus 2987: }
1.83 stevesk 2988: freeaddrinfo(aitop);
1.35 markus 2989: if (num_socks > 0)
2990: break;
1.25 markus 2991: }
2992: if (display_number >= MAX_DISPLAYS) {
2993: error("Failed to allocate internet-domain X11 display socket.");
1.141 stevesk 2994: return -1;
1.25 markus 2995: }
2996: /* Start listening for connections on the socket. */
1.35 markus 2997: for (n = 0; n < num_socks; n++) {
2998: sock = socks[n];
1.199 markus 2999: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.35 markus 3000: error("listen: %.100s", strerror(errno));
3001: close(sock);
1.141 stevesk 3002: return -1;
1.35 markus 3003: }
1.25 markus 3004: }
1.35 markus 3005:
3006: /* Allocate a channel for each socket. */
1.242 djm 3007: *chanids = xcalloc(num_socks + 1, sizeof(**chanids));
1.35 markus 3008: for (n = 0; n < num_socks; n++) {
3009: sock = socks[n];
1.149 markus 3010: nc = channel_new("x11 listener",
1.51 markus 3011: SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
3012: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.190 markus 3013: 0, "X11 inet listener", 1);
1.167 markus 3014: nc->single_connection = single_connection;
1.224 markus 3015: (*chanids)[n] = nc->self;
1.35 markus 3016: }
1.224 markus 3017: (*chanids)[n] = -1;
1.1 deraadt 3018:
1.141 stevesk 3019: /* Return the display number for the DISPLAY environment variable. */
1.176 deraadt 3020: *display_numberp = display_number;
3021: return (0);
1.1 deraadt 3022: }
3023:
1.127 itojun 3024: static int
1.77 markus 3025: connect_local_xsocket(u_int dnr)
1.1 deraadt 3026: {
1.25 markus 3027: int sock;
3028: struct sockaddr_un addr;
3029:
1.147 stevesk 3030: sock = socket(AF_UNIX, SOCK_STREAM, 0);
3031: if (sock < 0)
3032: error("socket: %.100s", strerror(errno));
3033: memset(&addr, 0, sizeof(addr));
3034: addr.sun_family = AF_UNIX;
3035: snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
1.239 deraadt 3036: if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0)
1.147 stevesk 3037: return sock;
3038: close(sock);
1.25 markus 3039: error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
3040: return -1;
1.1 deraadt 3041: }
3042:
1.51 markus 3043: int
3044: x11_connect_display(void)
1.1 deraadt 3045: {
1.248 deraadt 3046: u_int display_number;
1.25 markus 3047: const char *display;
1.51 markus 3048: char buf[1024], *cp;
1.35 markus 3049: struct addrinfo hints, *ai, *aitop;
3050: char strport[NI_MAXSERV];
1.248 deraadt 3051: int gaierr, sock = 0;
1.25 markus 3052:
3053: /* Try to open a socket for the local X server. */
3054: display = getenv("DISPLAY");
3055: if (!display) {
3056: error("DISPLAY not set.");
1.51 markus 3057: return -1;
1.25 markus 3058: }
1.27 markus 3059: /*
3060: * Now we decode the value of the DISPLAY variable and make a
3061: * connection to the real X server.
3062: */
3063:
3064: /*
3065: * Check if it is a unix domain socket. Unix domain displays are in
3066: * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
3067: */
1.25 markus 3068: if (strncmp(display, "unix:", 5) == 0 ||
3069: display[0] == ':') {
3070: /* Connect to the unix domain socket. */
1.248 deraadt 3071: if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) {
1.25 markus 3072: error("Could not parse display number from DISPLAY: %.100s",
1.148 deraadt 3073: display);
1.51 markus 3074: return -1;
1.25 markus 3075: }
3076: /* Create a socket. */
3077: sock = connect_local_xsocket(display_number);
3078: if (sock < 0)
1.51 markus 3079: return -1;
1.25 markus 3080:
3081: /* OK, we now have a connection to the display. */
1.51 markus 3082: return sock;
1.25 markus 3083: }
1.27 markus 3084: /*
3085: * Connect to an inet socket. The DISPLAY value is supposedly
3086: * hostname:d[.s], where hostname may also be numeric IP address.
3087: */
1.145 stevesk 3088: strlcpy(buf, display, sizeof(buf));
1.25 markus 3089: cp = strchr(buf, ':');
3090: if (!cp) {
3091: error("Could not find ':' in DISPLAY: %.100s", display);
1.51 markus 3092: return -1;
1.25 markus 3093: }
3094: *cp = 0;
1.27 markus 3095: /* buf now contains the host name. But first we parse the display number. */
1.248 deraadt 3096: if (sscanf(cp + 1, "%u", &display_number) != 1) {
1.25 markus 3097: error("Could not parse display number from DISPLAY: %.100s",
1.148 deraadt 3098: display);
1.51 markus 3099: return -1;
1.25 markus 3100: }
1.35 markus 3101:
3102: /* Look up the host address */
3103: memset(&hints, 0, sizeof(hints));
3104: hints.ai_family = IPv4or6;
3105: hints.ai_socktype = SOCK_STREAM;
1.248 deraadt 3106: snprintf(strport, sizeof strport, "%u", 6000 + display_number);
1.35 markus 3107: if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
1.271 dtucker 3108: error("%.100s: unknown host. (%s)", buf,
3109: ssh_gai_strerror(gaierr));
1.51 markus 3110: return -1;
1.25 markus 3111: }
1.35 markus 3112: for (ai = aitop; ai; ai = ai->ai_next) {
3113: /* Create a socket. */
1.189 markus 3114: sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.35 markus 3115: if (sock < 0) {
1.194 markus 3116: debug2("socket: %.100s", strerror(errno));
1.41 markus 3117: continue;
3118: }
3119: /* Connect it to the display. */
3120: if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1.248 deraadt 3121: debug2("connect %.100s port %u: %.100s", buf,
1.41 markus 3122: 6000 + display_number, strerror(errno));
3123: close(sock);
3124: continue;
3125: }
3126: /* Success */
3127: break;
1.35 markus 3128: }
3129: freeaddrinfo(aitop);
3130: if (!ai) {
1.248 deraadt 3131: error("connect %.100s port %u: %.100s", buf, 6000 + display_number,
1.35 markus 3132: strerror(errno));
1.51 markus 3133: return -1;
1.25 markus 3134: }
1.162 stevesk 3135: set_nodelay(sock);
1.51 markus 3136: return sock;
3137: }
3138:
3139: /*
3140: * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
3141: * the remote channel number. We should do whatever we want, and respond
3142: * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
3143: */
3144:
1.259 stevesk 3145: /* ARGSUSED */
1.51 markus 3146: void
1.154 markus 3147: x11_input_open(int type, u_int32_t seq, void *ctxt)
1.51 markus 3148: {
1.113 markus 3149: Channel *c = NULL;
3150: int remote_id, sock = 0;
1.51 markus 3151: char *remote_host;
1.25 markus 3152:
1.113 markus 3153: debug("Received X11 open request.");
1.51 markus 3154:
1.113 markus 3155: remote_id = packet_get_int();
1.121 markus 3156:
3157: if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
1.113 markus 3158: remote_host = packet_get_string(NULL);
1.51 markus 3159: } else {
3160: remote_host = xstrdup("unknown (remote did not supply name)");
3161: }
1.152 markus 3162: packet_check_eom();
1.25 markus 3163:
1.51 markus 3164: /* Obtain a connection to the real X display. */
3165: sock = x11_connect_display();
1.113 markus 3166: if (sock != -1) {
3167: /* Allocate a channel for this connection. */
3168: c = channel_new("connected x11 socket",
3169: SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
3170: remote_host, 1);
1.167 markus 3171: c->remote_id = remote_id;
3172: c->force_drain = 1;
1.113 markus 3173: }
1.190 markus 3174: xfree(remote_host);
1.113 markus 3175: if (c == NULL) {
1.51 markus 3176: /* Send refusal to the remote host. */
3177: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1.113 markus 3178: packet_put_int(remote_id);
1.51 markus 3179: } else {
3180: /* Send a confirmation to the remote host. */
3181: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1.113 markus 3182: packet_put_int(remote_id);
3183: packet_put_int(c->self);
1.51 markus 3184: }
1.113 markus 3185: packet_send();
1.72 markus 3186: }
3187:
3188: /* dummy protocol handler that denies SSH-1 requests (agent/x11) */
1.259 stevesk 3189: /* ARGSUSED */
1.72 markus 3190: void
1.154 markus 3191: deny_input_open(int type, u_int32_t seq, void *ctxt)
1.72 markus 3192: {
3193: int rchan = packet_get_int();
1.180 deraadt 3194:
1.143 deraadt 3195: switch (type) {
1.72 markus 3196: case SSH_SMSG_AGENT_OPEN:
3197: error("Warning: ssh server tried agent forwarding.");
3198: break;
3199: case SSH_SMSG_X11_OPEN:
3200: error("Warning: ssh server tried X11 forwarding.");
3201: break;
3202: default:
1.154 markus 3203: error("deny_input_open: type %d", type);
1.72 markus 3204: break;
3205: }
1.230 stevesk 3206: error("Warning: this is probably a break-in attempt by a malicious server.");
1.72 markus 3207: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
3208: packet_put_int(rchan);
3209: packet_send();
1.1 deraadt 3210: }
3211:
1.27 markus 3212: /*
3213: * Requests forwarding of X11 connections, generates fake authentication
3214: * data, and enables authentication spoofing.
1.121 markus 3215: * This should be called in the client only.
1.27 markus 3216: */
1.49 markus 3217: void
1.215 djm 3218: x11_request_forwarding_with_spoofing(int client_session_id, const char *disp,
1.51 markus 3219: const char *proto, const char *data)
1.1 deraadt 3220: {
1.77 markus 3221: u_int data_len = (u_int) strlen(data) / 2;
1.219 djm 3222: u_int i, value;
1.25 markus 3223: char *new_data;
3224: int screen_number;
3225: const char *cp;
1.207 avsm 3226: u_int32_t rnd = 0;
1.25 markus 3227:
1.220 markus 3228: if (x11_saved_display == NULL)
3229: x11_saved_display = xstrdup(disp);
3230: else if (strcmp(disp, x11_saved_display) != 0) {
1.219 djm 3231: error("x11_request_forwarding_with_spoofing: different "
3232: "$DISPLAY already forwarded");
3233: return;
3234: }
3235:
1.266 djm 3236: cp = strchr(disp, ':');
1.25 markus 3237: if (cp)
3238: cp = strchr(cp, '.');
3239: if (cp)
1.245 deraadt 3240: screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL);
1.25 markus 3241: else
3242: screen_number = 0;
3243:
1.219 djm 3244: if (x11_saved_proto == NULL) {
3245: /* Save protocol name. */
3246: x11_saved_proto = xstrdup(proto);
3247: /*
1.221 djm 3248: * Extract real authentication data and generate fake data
1.219 djm 3249: * of the same length.
3250: */
3251: x11_saved_data = xmalloc(data_len);
3252: x11_fake_data = xmalloc(data_len);
3253: for (i = 0; i < data_len; i++) {
3254: if (sscanf(data + 2 * i, "%2x", &value) != 1)
3255: fatal("x11_request_forwarding: bad "
3256: "authentication data: %.100s", data);
3257: if (i % 4 == 0)
3258: rnd = arc4random();
3259: x11_saved_data[i] = value;
3260: x11_fake_data[i] = rnd & 0xff;
3261: rnd >>= 8;
3262: }
3263: x11_saved_data_len = data_len;
3264: x11_fake_data_len = data_len;
1.25 markus 3265: }
3266:
3267: /* Convert the fake data into hex. */
1.219 djm 3268: new_data = tohex(x11_fake_data, data_len);
1.25 markus 3269:
3270: /* Send the request packet. */
1.51 markus 3271: if (compat20) {
3272: channel_request_start(client_session_id, "x11-req", 0);
3273: packet_put_char(0); /* XXX bool single connection */
3274: } else {
3275: packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
3276: }
3277: packet_put_cstring(proto);
3278: packet_put_cstring(new_data);
1.25 markus 3279: packet_put_int(screen_number);
3280: packet_send();
3281: packet_write_wait();
3282: xfree(new_data);
1.1 deraadt 3283: }
3284:
1.121 markus 3285:
3286: /* -- agent forwarding */
3287:
1.1 deraadt 3288: /* Sends a message to the server to request authentication fd forwarding. */
3289:
1.49 markus 3290: void
1.142 itojun 3291: auth_request_forwarding(void)
1.1 deraadt 3292: {
1.25 markus 3293: packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
3294: packet_send();
3295: packet_write_wait();
1.1 deraadt 3296: }
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