Annotation of src/usr.bin/ssh/channels.c, Revision 1.426
1.426 ! djm 1: /* $OpenBSD: channels.c,v 1.425 2023/01/06 02:42:34 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>
1.336 millert 43: #include <sys/stat.h>
1.234 stevesk 44: #include <sys/ioctl.h>
1.235 stevesk 45: #include <sys/un.h>
1.251 stevesk 46: #include <sys/socket.h>
1.261 stevesk 47: #include <sys/time.h>
1.275 djm 48: #include <sys/queue.h>
1.251 stevesk 49:
50: #include <netinet/in.h>
51: #include <arpa/inet.h>
1.233 stevesk 52:
1.254 stevesk 53: #include <errno.h>
1.298 dtucker 54: #include <fcntl.h>
1.367 djm 55: #include <limits.h>
1.255 stevesk 56: #include <netdb.h>
1.411 djm 57: #include <poll.h>
1.367 djm 58: #include <stdarg.h>
1.341 millert 59: #include <stdint.h>
1.263 stevesk 60: #include <stdio.h>
1.262 stevesk 61: #include <stdlib.h>
1.260 stevesk 62: #include <string.h>
1.233 stevesk 63: #include <termios.h>
1.256 stevesk 64: #include <unistd.h>
1.1 deraadt 65:
1.265 deraadt 66: #include "xmalloc.h"
1.1 deraadt 67: #include "ssh.h"
1.82 markus 68: #include "ssh2.h"
1.354 markus 69: #include "ssherr.h"
1.367 djm 70: #include "sshbuf.h"
1.1 deraadt 71: #include "packet.h"
1.82 markus 72: #include "log.h"
73: #include "misc.h"
1.14 markus 74: #include "channels.h"
75: #include "compat.h"
1.82 markus 76: #include "canohost.h"
1.383 markus 77: #include "sshkey.h"
1.64 markus 78: #include "authfd.h"
1.147 stevesk 79: #include "pathnames.h"
1.381 djm 80: #include "match.h"
1.388 djm 81:
1.411 djm 82: /* XXX remove once we're satisfied there's no lurking bugs */
83: /* #define DEBUG_CHANNEL_POLL 1 */
84:
1.367 djm 85: /* -- agent forwarding */
86: #define NUM_SOCKS 10
1.12 markus 87:
1.367 djm 88: /* -- tcp forwarding */
89: /* special-case port number meaning allow any port */
90: #define FWD_PERMIT_ANY_PORT 0
1.1 deraadt 91:
1.367 djm 92: /* special-case wildcard meaning allow any host */
93: #define FWD_PERMIT_ANY_HOST "*"
1.1 deraadt 94:
1.367 djm 95: /* -- X11 forwarding */
96: /* Maximum number of fake X11 displays to try. */
97: #define MAX_DISPLAYS 1000
1.1 deraadt 98:
1.411 djm 99: /* Per-channel callback for pre/post IO actions */
1.410 djm 100: typedef void chan_fn(struct ssh *, Channel *c);
1.381 djm 101:
1.27 markus 102: /*
103: * Data structure for storing which hosts are permitted for forward requests.
104: * The local sides of any remote forwards are stored in this array to prevent
105: * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
106: * network (which might be behind a firewall).
107: */
1.336 millert 108: /* XXX: streamlocal wants a path instead of host:port */
109: /* Overload host_to_connect; we could just make this match Forward */
110: /* XXX - can we use listen_host instead of listen_path? */
1.381 djm 111: struct permission {
1.41 markus 112: char *host_to_connect; /* Connect to 'host'. */
1.336 millert 113: int port_to_connect; /* Connect to 'port'. */
1.333 markus 114: char *listen_host; /* Remote side should listen address. */
1.336 millert 115: char *listen_path; /* Remote side should listen path. */
116: int listen_port; /* Remote side should listen port. */
1.354 markus 117: Channel *downstream; /* Downstream mux*/
1.381 djm 118: };
119:
120: /*
121: * Stores the forwarding permission state for a single direction (local or
122: * remote).
123: */
124: struct permission_set {
125: /*
126: * List of all local permitted host/port pairs to allow for the
127: * user.
128: */
129: u_int num_permitted_user;
130: struct permission *permitted_user;
1.1 deraadt 131:
1.381 djm 132: /*
133: * List of all permitted host/port pairs to allow for the admin.
134: */
135: u_int num_permitted_admin;
136: struct permission *permitted_admin;
137:
138: /*
139: * If this is true, all opens/listens are permitted. This is the
140: * case on the server on which we have to trust the client anyway,
141: * and the user could do anything after logging in.
142: */
143: int all_permitted;
144: };
1.121 markus 145:
1.426 ! djm 146: /* Used to record timeouts per channel type */
! 147: struct ssh_channel_timeout {
! 148: char *type_pattern;
! 149: u_int timeout_secs;
! 150: };
! 151:
1.367 djm 152: /* Master structure for channels state */
153: struct ssh_channels {
154: /*
155: * Pointer to an array containing all allocated channels. The array
156: * is dynamically extended as needed.
157: */
158: Channel **channels;
1.257 dtucker 159:
1.367 djm 160: /*
161: * Size of the channel array. All slots of the array must always be
162: * initialized (at least the type field); unused slots set to NULL
163: */
164: u_int channels_alloc;
1.257 dtucker 165:
1.367 djm 166: /*
1.411 djm 167: * 'channel_pre*' are called just before IO to add any bits
168: * relevant to channels in the c->io_want bitmasks.
1.367 djm 169: *
170: * 'channel_post*': perform any appropriate operations for
1.411 djm 171: * channels which have c->io_ready events pending.
1.367 djm 172: */
173: chan_fn **channel_pre;
174: chan_fn **channel_post;
1.314 dtucker 175:
1.367 djm 176: /* -- tcp forwarding */
1.381 djm 177: struct permission_set local_perms;
178: struct permission_set remote_perms;
1.219 djm 179:
1.367 djm 180: /* -- X11 forwarding */
1.121 markus 181:
1.367 djm 182: /* Saved X11 local (client) display. */
183: char *x11_saved_display;
1.121 markus 184:
1.367 djm 185: /* Saved X11 authentication protocol name. */
186: char *x11_saved_proto;
1.347 djm 187:
1.367 djm 188: /* Saved X11 authentication data. This is the real data. */
189: char *x11_saved_data;
190: u_int x11_saved_data_len;
1.121 markus 191:
1.367 djm 192: /* Deadline after which all X11 connections are refused */
193: u_int x11_refuse_time;
1.121 markus 194:
1.367 djm 195: /*
196: * Fake X11 authentication data. This is what the server will be
197: * sending us; we should replace any occurrences of this by the
198: * real data.
199: */
200: u_char *x11_fake_data;
201: u_int x11_fake_data_len;
1.121 markus 202:
1.367 djm 203: /* AF_UNSPEC or AF_INET or AF_INET6 */
204: int IPv4or6;
1.426 ! djm 205:
! 206: /* Channel timeouts by type */
! 207: struct ssh_channel_timeout *timeouts;
! 208: size_t ntimeouts;
1.367 djm 209: };
1.1 deraadt 210:
1.121 markus 211: /* helper */
1.367 djm 212: static void port_open_helper(struct ssh *ssh, Channel *c, char *rtype);
1.354 markus 213: static const char *channel_rfwd_bind_host(const char *listen_host);
1.103 markus 214:
1.276 djm 215: /* non-blocking connect helpers */
216: static int connect_next(struct channel_connect *);
217: static void channel_connect_ctx_free(struct channel_connect *);
1.372 markus 218: static Channel *rdynamic_connect_prepare(struct ssh *, char *, char *);
219: static int rdynamic_connect_finish(struct ssh *, Channel *);
1.276 djm 220:
1.367 djm 221: /* Setup helper */
222: static void channel_handler_init(struct ssh_channels *sc);
223:
1.121 markus 224: /* -- channel core */
1.41 markus 225:
1.367 djm 226: void
227: channel_init_channels(struct ssh *ssh)
228: {
229: struct ssh_channels *sc;
230:
1.387 djm 231: if ((sc = calloc(1, sizeof(*sc))) == NULL)
1.403 djm 232: fatal_f("allocation failed");
1.367 djm 233: sc->channels_alloc = 10;
234: sc->channels = xcalloc(sc->channels_alloc, sizeof(*sc->channels));
235: sc->IPv4or6 = AF_UNSPEC;
236: channel_handler_init(sc);
237:
238: ssh->chanctxt = sc;
239: }
240:
1.41 markus 241: Channel *
1.367 djm 242: channel_by_id(struct ssh *ssh, int id)
1.41 markus 243: {
244: Channel *c;
1.113 markus 245:
1.367 djm 246: if (id < 0 || (u_int)id >= ssh->chanctxt->channels_alloc) {
1.403 djm 247: logit_f("%d: bad id", id);
1.41 markus 248: return NULL;
249: }
1.367 djm 250: c = ssh->chanctxt->channels[id];
1.113 markus 251: if (c == NULL) {
1.403 djm 252: logit_f("%d: bad id: channel free", id);
1.41 markus 253: return NULL;
254: }
255: return c;
1.55 markus 256: }
257:
1.354 markus 258: Channel *
1.368 djm 259: channel_by_remote_id(struct ssh *ssh, u_int remote_id)
1.354 markus 260: {
261: Channel *c;
262: u_int i;
263:
1.367 djm 264: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
265: c = ssh->chanctxt->channels[i];
1.368 djm 266: if (c != NULL && c->have_remote_id && c->remote_id == remote_id)
1.354 markus 267: return c;
268: }
269: return NULL;
270: }
271:
1.27 markus 272: /*
1.229 markus 273: * Returns the channel if it is allowed to receive protocol messages.
274: * Private channels, like listening sockets, may not receive messages.
275: */
276: Channel *
1.367 djm 277: channel_lookup(struct ssh *ssh, int id)
1.229 markus 278: {
279: Channel *c;
280:
1.367 djm 281: if ((c = channel_by_id(ssh, id)) == NULL)
282: return NULL;
1.229 markus 283:
1.237 deraadt 284: switch (c->type) {
1.229 markus 285: case SSH_CHANNEL_X11_OPEN:
286: case SSH_CHANNEL_LARVAL:
287: case SSH_CHANNEL_CONNECTING:
288: case SSH_CHANNEL_DYNAMIC:
1.372 markus 289: case SSH_CHANNEL_RDYNAMIC_OPEN:
290: case SSH_CHANNEL_RDYNAMIC_FINISH:
1.229 markus 291: case SSH_CHANNEL_OPENING:
292: case SSH_CHANNEL_OPEN:
1.323 dtucker 293: case SSH_CHANNEL_ABANDONED:
1.354 markus 294: case SSH_CHANNEL_MUX_PROXY:
1.367 djm 295: return c;
1.229 markus 296: }
297: logit("Non-public channel %d, type %d.", id, c->type);
1.367 djm 298: return NULL;
1.229 markus 299: }
300:
301: /*
1.426 ! djm 302: * Add a timeout for open channels whose c->ctype (or c->xctype if it is set)
! 303: * match type_pattern.
! 304: */
! 305: void
! 306: channel_add_timeout(struct ssh *ssh, const char *type_pattern,
! 307: u_int timeout_secs)
! 308: {
! 309: struct ssh_channels *sc = ssh->chanctxt;
! 310:
! 311: debug2_f("channel type \"%s\" timeout %u seconds",
! 312: type_pattern, timeout_secs);
! 313: sc->timeouts = xrecallocarray(sc->timeouts, sc->ntimeouts,
! 314: sc->ntimeouts + 1, sizeof(*sc->timeouts));
! 315: sc->timeouts[sc->ntimeouts].type_pattern = xstrdup(type_pattern);
! 316: sc->timeouts[sc->ntimeouts].timeout_secs = timeout_secs;
! 317: sc->ntimeouts++;
! 318: }
! 319:
! 320: /* Clears all previously-added channel timeouts */
! 321: void
! 322: channel_clear_timeouts(struct ssh *ssh)
! 323: {
! 324: struct ssh_channels *sc = ssh->chanctxt;
! 325: size_t i;
! 326:
! 327: debug3_f("clearing");
! 328: for (i = 0; i < sc->ntimeouts; i++)
! 329: free(sc->timeouts[i].type_pattern);
! 330: free(sc->timeouts);
! 331: sc->timeouts = NULL;
! 332: sc->ntimeouts = 0;
! 333: }
! 334:
! 335: static u_int
! 336: lookup_timeout(struct ssh *ssh, const char *type)
! 337: {
! 338: struct ssh_channels *sc = ssh->chanctxt;
! 339: size_t i;
! 340:
! 341: for (i = 0; i < sc->ntimeouts; i++) {
! 342: if (match_pattern(type, sc->timeouts[i].type_pattern))
! 343: return sc->timeouts[i].timeout_secs;
! 344: }
! 345:
! 346: return 0;
! 347: }
! 348:
! 349: /*
1.425 djm 350: * Sets "extended type" of a channel; used by session layer to add additional
351: * information about channel types (e.g. shell, login, subsystem) that can then
352: * be used to select timeouts.
1.426 ! djm 353: * Will reset c->inactive_deadline as a side-effect.
1.425 djm 354: */
355: void
356: channel_set_xtype(struct ssh *ssh, int id, const char *xctype)
357: {
358: Channel *c;
359:
360: if ((c = channel_by_id(ssh, id)) == NULL)
361: fatal_f("missing channel %d", id);
362: if (c->xctype != NULL)
363: free(c->xctype);
364: c->xctype = xstrdup(xctype);
1.426 ! djm 365: /* Type has changed, so look up inactivity deadline again */
! 366: c->inactive_deadline = lookup_timeout(ssh, c->xctype);
! 367: debug2_f("labeled channel %d as %s (inactive timeout %u)", id, xctype,
! 368: c->inactive_deadline);
1.425 djm 369: }
370:
371: /*
1.55 markus 372: * Register filedescriptors for a channel, used when allocating a channel or
1.52 markus 373: * when the channel consumer/producer is ready, e.g. shell exec'd
1.27 markus 374: */
1.127 itojun 375: static void
1.367 djm 376: channel_register_fds(struct ssh *ssh, Channel *c, int rfd, int wfd, int efd,
1.282 dtucker 377: int extusage, int nonblock, int is_tty)
1.1 deraadt 378: {
1.418 markus 379: int val;
380:
1.298 dtucker 381: if (rfd != -1)
382: fcntl(rfd, F_SETFD, FD_CLOEXEC);
383: if (wfd != -1 && wfd != rfd)
384: fcntl(wfd, F_SETFD, FD_CLOEXEC);
385: if (efd != -1 && efd != rfd && efd != wfd)
386: fcntl(efd, F_SETFD, FD_CLOEXEC);
1.55 markus 387:
1.52 markus 388: c->rfd = rfd;
389: c->wfd = wfd;
390: c->sock = (rfd == wfd) ? rfd : -1;
391: c->efd = efd;
392: c->extended_usage = extusage;
1.71 markus 393:
1.282 dtucker 394: if ((c->isatty = is_tty) != 0)
1.194 markus 395: debug2("channel %d: rfd %d isatty", c->self, c->rfd);
1.91 markus 396:
1.71 markus 397: /* enable nonblocking mode */
1.407 djm 398: c->restore_block = 0;
399: if (nonblock == CHANNEL_NONBLOCK_STDIO) {
400: /*
401: * Special handling for stdio file descriptors: do not set
402: * non-blocking mode if they are TTYs. Otherwise prepare to
403: * restore their blocking state on exit to avoid interfering
404: * with other programs that follow.
405: */
1.418 markus 406: if (rfd != -1 && !isatty(rfd) &&
407: (val = fcntl(rfd, F_GETFL)) != -1 && !(val & O_NONBLOCK)) {
1.407 djm 408: c->restore_block |= CHANNEL_RESTORE_RFD;
409: set_nonblock(rfd);
410: }
1.418 markus 411: if (wfd != -1 && !isatty(wfd) &&
412: (val = fcntl(wfd, F_GETFL)) != -1 && !(val & O_NONBLOCK)) {
1.407 djm 413: c->restore_block |= CHANNEL_RESTORE_WFD;
414: set_nonblock(wfd);
415: }
1.418 markus 416: if (efd != -1 && !isatty(efd) &&
417: (val = fcntl(efd, F_GETFL)) != -1 && !(val & O_NONBLOCK)) {
1.407 djm 418: c->restore_block |= CHANNEL_RESTORE_EFD;
419: set_nonblock(efd);
420: }
421: } else if (nonblock) {
1.71 markus 422: if (rfd != -1)
423: set_nonblock(rfd);
424: if (wfd != -1)
425: set_nonblock(wfd);
426: if (efd != -1)
427: set_nonblock(efd);
428: }
1.52 markus 429: }
430:
431: /*
1.419 djm 432: * Allocate a new channel object and set its type and socket.
1.52 markus 433: */
1.113 markus 434: Channel *
1.367 djm 435: channel_new(struct ssh *ssh, char *ctype, int type, int rfd, int wfd, int efd,
1.419 djm 436: u_int window, u_int maxpack, int extusage, const char *remote_name,
437: int nonblock)
1.52 markus 438: {
1.367 djm 439: struct ssh_channels *sc = ssh->chanctxt;
440: u_int i, found;
1.52 markus 441: Channel *c;
1.402 djm 442: int r;
1.25 markus 443:
444: /* Try to find a free slot where to put the new channel. */
1.367 djm 445: for (i = 0; i < sc->channels_alloc; i++) {
446: if (sc->channels[i] == NULL) {
1.25 markus 447: /* Found a free slot. */
1.367 djm 448: found = i;
1.25 markus 449: break;
450: }
1.367 djm 451: }
452: if (i >= sc->channels_alloc) {
453: /*
454: * There are no free slots. Take last+1 slot and expand
455: * the array.
456: */
457: found = sc->channels_alloc;
458: if (sc->channels_alloc > CHANNELS_MAX_CHANNELS)
1.403 djm 459: fatal_f("internal error: channels_alloc %d too big",
460: sc->channels_alloc);
1.367 djm 461: sc->channels = xrecallocarray(sc->channels, sc->channels_alloc,
462: sc->channels_alloc + 10, sizeof(*sc->channels));
463: sc->channels_alloc += 10;
464: debug2("channel: expanding %d", sc->channels_alloc);
1.25 markus 465: }
1.113 markus 466: /* Initialize and return new channel. */
1.367 djm 467: c = sc->channels[found] = xcalloc(1, sizeof(Channel));
468: if ((c->input = sshbuf_new()) == NULL ||
469: (c->output = sshbuf_new()) == NULL ||
470: (c->extended = sshbuf_new()) == NULL)
1.403 djm 471: fatal_f("sshbuf_new failed");
1.402 djm 472: if ((r = sshbuf_set_max_size(c->input, CHAN_INPUT_MAX)) != 0)
1.403 djm 473: fatal_fr(r, "sshbuf_set_max_size");
1.159 markus 474: c->ostate = CHAN_OUTPUT_OPEN;
475: c->istate = CHAN_INPUT_OPEN;
1.367 djm 476: channel_register_fds(ssh, c, rfd, wfd, efd, extusage, nonblock, 0);
1.25 markus 477: c->self = found;
478: c->type = type;
1.41 markus 479: c->ctype = ctype;
1.51 markus 480: c->local_window = window;
481: c->local_window_max = window;
482: c->local_maxpacket = maxpack;
1.190 markus 483: c->remote_name = xstrdup(remote_name);
1.302 djm 484: c->ctl_chan = -1;
1.299 markus 485: c->delayed = 1; /* prevent call to channel_post handler */
1.426 ! djm 486: c->inactive_deadline = lookup_timeout(ssh, c->ctype);
1.275 djm 487: TAILQ_INIT(&c->status_confirms);
1.426 ! djm 488: debug("channel %d: new %s [%s] (inactive timeout: %u)",
! 489: found, c->ctype, remote_name, c->inactive_deadline);
1.113 markus 490: return c;
1.1 deraadt 491: }
1.52 markus 492:
1.132 markus 493: int
1.407 djm 494: channel_close_fd(struct ssh *ssh, Channel *c, int *fdp)
1.132 markus 495: {
1.407 djm 496: int ret, fd = *fdp;
1.132 markus 497:
1.407 djm 498: if (fd == -1)
499: return 0;
500:
501: if ((*fdp == c->rfd && (c->restore_block & CHANNEL_RESTORE_RFD) != 0) ||
502: (*fdp == c->wfd && (c->restore_block & CHANNEL_RESTORE_WFD) != 0) ||
503: (*fdp == c->efd && (c->restore_block & CHANNEL_RESTORE_EFD) != 0))
504: (void)fcntl(*fdp, F_SETFL, 0); /* restore blocking */
505:
1.411 djm 506: if (*fdp == c->rfd) {
507: c->io_want &= ~SSH_CHAN_IO_RFD;
508: c->io_ready &= ~SSH_CHAN_IO_RFD;
509: c->rfd = -1;
1.415 djm 510: c->pfds[0] = -1;
1.411 djm 511: }
512: if (*fdp == c->wfd) {
513: c->io_want &= ~SSH_CHAN_IO_WFD;
514: c->io_ready &= ~SSH_CHAN_IO_WFD;
515: c->wfd = -1;
1.415 djm 516: c->pfds[1] = -1;
1.411 djm 517: }
518: if (*fdp == c->efd) {
519: c->io_want &= ~SSH_CHAN_IO_EFD;
520: c->io_ready &= ~SSH_CHAN_IO_EFD;
521: c->efd = -1;
1.415 djm 522: c->pfds[2] = -1;
1.411 djm 523: }
524: if (*fdp == c->sock) {
525: c->io_want &= ~SSH_CHAN_IO_SOCK;
526: c->io_ready &= ~SSH_CHAN_IO_SOCK;
527: c->sock = -1;
1.415 djm 528: c->pfds[3] = -1;
1.411 djm 529: }
530:
1.407 djm 531: ret = close(fd);
1.411 djm 532: *fdp = -1; /* probably redundant */
1.132 markus 533: return ret;
534: }
535:
1.52 markus 536: /* Close all channel fd/socket. */
1.127 itojun 537: static void
1.367 djm 538: channel_close_fds(struct ssh *ssh, Channel *c)
539: {
1.379 tb 540: int sock = c->sock, rfd = c->rfd, wfd = c->wfd, efd = c->efd;
541:
1.407 djm 542: channel_close_fd(ssh, c, &c->sock);
1.379 tb 543: if (rfd != sock)
1.407 djm 544: channel_close_fd(ssh, c, &c->rfd);
1.379 tb 545: if (wfd != sock && wfd != rfd)
1.407 djm 546: channel_close_fd(ssh, c, &c->wfd);
1.379 tb 547: if (efd != sock && efd != rfd && efd != wfd)
1.407 djm 548: channel_close_fd(ssh, c, &c->efd);
1.367 djm 549: }
550:
551: static void
1.381 djm 552: fwd_perm_clear(struct permission *perm)
1.52 markus 553: {
1.381 djm 554: free(perm->host_to_connect);
555: free(perm->listen_host);
556: free(perm->listen_path);
1.398 dtucker 557: memset(perm, 0, sizeof(*perm));
1.367 djm 558: }
559:
1.381 djm 560: /* Returns an printable name for the specified forwarding permission list */
561: static const char *
562: fwd_ident(int who, int where)
563: {
564: if (who == FORWARD_ADM) {
565: if (where == FORWARD_LOCAL)
566: return "admin local";
567: else if (where == FORWARD_REMOTE)
568: return "admin remote";
569: } else if (who == FORWARD_USER) {
570: if (where == FORWARD_LOCAL)
571: return "user local";
572: else if (where == FORWARD_REMOTE)
573: return "user remote";
574: }
575: fatal("Unknown forward permission list %d/%d", who, where);
576: }
577:
578: /* Returns the forwarding permission list for the specified direction */
579: static struct permission_set *
580: permission_set_get(struct ssh *ssh, int where)
581: {
582: struct ssh_channels *sc = ssh->chanctxt;
1.367 djm 583:
1.381 djm 584: switch (where) {
585: case FORWARD_LOCAL:
586: return &sc->local_perms;
587: break;
588: case FORWARD_REMOTE:
589: return &sc->remote_perms;
590: break;
591: default:
1.403 djm 592: fatal_f("invalid forwarding direction %d", where);
1.381 djm 593: }
594: }
595:
1.392 dtucker 596: /* Returns pointers to the specified forwarding list and its element count */
1.381 djm 597: static void
598: permission_set_get_array(struct ssh *ssh, int who, int where,
599: struct permission ***permpp, u_int **npermpp)
600: {
601: struct permission_set *pset = permission_set_get(ssh, where);
602:
603: switch (who) {
604: case FORWARD_USER:
605: *permpp = &pset->permitted_user;
606: *npermpp = &pset->num_permitted_user;
607: break;
608: case FORWARD_ADM:
609: *permpp = &pset->permitted_admin;
610: *npermpp = &pset->num_permitted_admin;
611: break;
612: default:
1.403 djm 613: fatal_f("invalid forwarding client %d", who);
1.381 djm 614: }
615: }
616:
1.409 jsg 617: /* Adds an entry to the specified forwarding list */
1.367 djm 618: static int
1.381 djm 619: permission_set_add(struct ssh *ssh, int who, int where,
1.367 djm 620: const char *host_to_connect, int port_to_connect,
621: const char *listen_host, const char *listen_path, int listen_port,
622: Channel *downstream)
623: {
1.381 djm 624: struct permission **permp;
625: u_int n, *npermp;
1.367 djm 626:
1.381 djm 627: permission_set_get_array(ssh, who, where, &permp, &npermp);
1.367 djm 628:
1.381 djm 629: if (*npermp >= INT_MAX)
1.403 djm 630: fatal_f("%s overflow", fwd_ident(who, where));
1.367 djm 631:
1.381 djm 632: *permp = xrecallocarray(*permp, *npermp, *npermp + 1, sizeof(**permp));
633: n = (*npermp)++;
1.367 djm 634: #define MAYBE_DUP(s) ((s == NULL) ? NULL : xstrdup(s))
1.381 djm 635: (*permp)[n].host_to_connect = MAYBE_DUP(host_to_connect);
636: (*permp)[n].port_to_connect = port_to_connect;
637: (*permp)[n].listen_host = MAYBE_DUP(listen_host);
638: (*permp)[n].listen_path = MAYBE_DUP(listen_path);
639: (*permp)[n].listen_port = listen_port;
640: (*permp)[n].downstream = downstream;
1.367 djm 641: #undef MAYBE_DUP
642: return (int)n;
643: }
644:
645: static void
646: mux_remove_remote_forwardings(struct ssh *ssh, Channel *c)
647: {
648: struct ssh_channels *sc = ssh->chanctxt;
1.381 djm 649: struct permission_set *pset = &sc->local_perms;
650: struct permission *perm;
1.367 djm 651: int r;
652: u_int i;
653:
1.381 djm 654: for (i = 0; i < pset->num_permitted_user; i++) {
655: perm = &pset->permitted_user[i];
656: if (perm->downstream != c)
1.367 djm 657: continue;
658:
659: /* cancel on the server, since mux client is gone */
660: debug("channel %d: cleanup remote forward for %s:%u",
1.381 djm 661: c->self, perm->listen_host, perm->listen_port);
1.367 djm 662: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
663: (r = sshpkt_put_cstring(ssh,
664: "cancel-tcpip-forward")) != 0 ||
665: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
666: (r = sshpkt_put_cstring(ssh,
1.381 djm 667: channel_rfwd_bind_host(perm->listen_host))) != 0 ||
668: (r = sshpkt_put_u32(ssh, perm->listen_port)) != 0 ||
1.367 djm 669: (r = sshpkt_send(ssh)) != 0) {
1.403 djm 670: fatal_fr(r, "channel %i", c->self);
1.367 djm 671: }
1.381 djm 672: fwd_perm_clear(perm); /* unregister */
1.367 djm 673: }
1.121 markus 674: }
675:
676: /* Free the channel and close its fd/socket. */
677: void
1.367 djm 678: channel_free(struct ssh *ssh, Channel *c)
1.121 markus 679: {
1.367 djm 680: struct ssh_channels *sc = ssh->chanctxt;
1.121 markus 681: char *s;
1.209 avsm 682: u_int i, n;
1.354 markus 683: Channel *other;
1.275 djm 684: struct channel_confirm *cc;
1.121 markus 685:
1.367 djm 686: for (n = 0, i = 0; i < sc->channels_alloc; i++) {
687: if ((other = sc->channels[i]) == NULL)
688: continue;
689: n++;
690: /* detach from mux client and prepare for closing */
691: if (c->type == SSH_CHANNEL_MUX_CLIENT &&
692: other->type == SSH_CHANNEL_MUX_PROXY &&
693: other->mux_ctx == c) {
694: other->mux_ctx = NULL;
695: other->type = SSH_CHANNEL_OPEN;
696: other->istate = CHAN_INPUT_CLOSED;
697: other->ostate = CHAN_OUTPUT_CLOSED;
1.354 markus 698: }
699: }
1.209 avsm 700: debug("channel %d: free: %s, nchannels %u", c->self,
1.121 markus 701: c->remote_name ? c->remote_name : "???", n);
702:
1.408 mbuhl 703: if (c->type == SSH_CHANNEL_MUX_CLIENT) {
1.367 djm 704: mux_remove_remote_forwardings(ssh, c);
1.408 mbuhl 705: free(c->mux_ctx);
706: c->mux_ctx = NULL;
707: } else if (c->type == SSH_CHANNEL_MUX_LISTENER) {
1.401 djm 708: free(c->mux_ctx);
709: c->mux_ctx = NULL;
710: }
1.354 markus 711:
1.384 markus 712: if (log_level_get() >= SYSLOG_LEVEL_DEBUG3) {
713: s = channel_open_message(ssh);
714: debug3("channel %d: status: %s", c->self, s);
715: free(s);
716: }
1.121 markus 717:
1.367 djm 718: channel_close_fds(ssh, c);
719: sshbuf_free(c->input);
720: sshbuf_free(c->output);
721: sshbuf_free(c->extended);
722: c->input = c->output = c->extended = NULL;
1.321 djm 723: free(c->remote_name);
724: c->remote_name = NULL;
725: free(c->path);
726: c->path = NULL;
727: free(c->listening_addr);
728: c->listening_addr = NULL;
1.425 djm 729: free(c->xctype);
730: c->xctype = NULL;
1.275 djm 731: while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) {
732: if (cc->abandon_cb != NULL)
1.367 djm 733: cc->abandon_cb(ssh, c, cc->ctx);
1.275 djm 734: TAILQ_REMOVE(&c->status_confirms, cc, entry);
1.396 jsg 735: freezero(cc, sizeof(*cc));
1.275 djm 736: }
1.280 djm 737: if (c->filter_cleanup != NULL && c->filter_ctx != NULL)
1.367 djm 738: c->filter_cleanup(ssh, c->self, c->filter_ctx);
739: sc->channels[c->self] = NULL;
1.396 jsg 740: freezero(c, sizeof(*c));
1.121 markus 741: }
742:
743: void
1.367 djm 744: channel_free_all(struct ssh *ssh)
1.121 markus 745: {
1.209 avsm 746: u_int i;
1.390 dtucker 747: struct ssh_channels *sc = ssh->chanctxt;
1.121 markus 748:
1.390 dtucker 749: for (i = 0; i < sc->channels_alloc; i++)
750: if (sc->channels[i] != NULL)
751: channel_free(ssh, sc->channels[i]);
752:
753: free(sc->channels);
754: sc->channels = NULL;
755: sc->channels_alloc = 0;
756:
757: free(sc->x11_saved_display);
758: sc->x11_saved_display = NULL;
759:
760: free(sc->x11_saved_proto);
761: sc->x11_saved_proto = NULL;
762:
763: free(sc->x11_saved_data);
764: sc->x11_saved_data = NULL;
765: sc->x11_saved_data_len = 0;
766:
767: free(sc->x11_fake_data);
768: sc->x11_fake_data = NULL;
769: sc->x11_fake_data_len = 0;
1.131 markus 770: }
771:
1.121 markus 772: /*
773: * Closes the sockets/fds of all channels. This is used to close extra file
774: * descriptors after a fork.
775: */
776: void
1.367 djm 777: channel_close_all(struct ssh *ssh)
1.121 markus 778: {
1.209 avsm 779: u_int i;
1.121 markus 780:
1.367 djm 781: for (i = 0; i < ssh->chanctxt->channels_alloc; i++)
782: if (ssh->chanctxt->channels[i] != NULL)
783: channel_close_fds(ssh, ssh->chanctxt->channels[i]);
1.121 markus 784: }
785:
786: /*
1.131 markus 787: * Stop listening to channels.
788: */
789: void
1.367 djm 790: channel_stop_listening(struct ssh *ssh)
1.131 markus 791: {
1.209 avsm 792: u_int i;
1.131 markus 793: Channel *c;
794:
1.367 djm 795: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
796: c = ssh->chanctxt->channels[i];
1.131 markus 797: if (c != NULL) {
798: switch (c->type) {
799: case SSH_CHANNEL_AUTH_SOCKET:
800: case SSH_CHANNEL_PORT_LISTENER:
801: case SSH_CHANNEL_RPORT_LISTENER:
802: case SSH_CHANNEL_X11_LISTENER:
1.336 millert 803: case SSH_CHANNEL_UNIX_LISTENER:
804: case SSH_CHANNEL_RUNIX_LISTENER:
1.407 djm 805: channel_close_fd(ssh, c, &c->sock);
1.367 djm 806: channel_free(ssh, c);
1.131 markus 807: break;
808: }
809: }
810: }
811: }
812:
813: /*
1.121 markus 814: * Returns true if no channel has too much buffered data, and false if one or
815: * more channel is overfull.
816: */
817: int
1.367 djm 818: channel_not_very_much_buffered_data(struct ssh *ssh)
1.121 markus 819: {
820: u_int i;
1.367 djm 821: u_int maxsize = ssh_packet_get_maxsize(ssh);
1.121 markus 822: Channel *c;
823:
1.367 djm 824: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
825: c = ssh->chanctxt->channels[i];
826: if (c == NULL || c->type != SSH_CHANNEL_OPEN)
827: continue;
828: if (sshbuf_len(c->output) > maxsize) {
829: debug2("channel %d: big output buffer %zu > %u",
830: c->self, sshbuf_len(c->output), maxsize);
831: return 0;
1.121 markus 832: }
833: }
834: return 1;
835: }
836:
837: /* Returns true if any channel is still open. */
838: int
1.367 djm 839: channel_still_open(struct ssh *ssh)
1.121 markus 840: {
1.209 avsm 841: u_int i;
1.121 markus 842: Channel *c;
843:
1.367 djm 844: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
845: c = ssh->chanctxt->channels[i];
1.121 markus 846: if (c == NULL)
847: continue;
848: switch (c->type) {
849: case SSH_CHANNEL_X11_LISTENER:
850: case SSH_CHANNEL_PORT_LISTENER:
851: case SSH_CHANNEL_RPORT_LISTENER:
1.302 djm 852: case SSH_CHANNEL_MUX_LISTENER:
1.121 markus 853: case SSH_CHANNEL_CLOSED:
854: case SSH_CHANNEL_AUTH_SOCKET:
855: case SSH_CHANNEL_DYNAMIC:
1.372 markus 856: case SSH_CHANNEL_RDYNAMIC_OPEN:
1.121 markus 857: case SSH_CHANNEL_CONNECTING:
858: case SSH_CHANNEL_ZOMBIE:
1.323 dtucker 859: case SSH_CHANNEL_ABANDONED:
1.336 millert 860: case SSH_CHANNEL_UNIX_LISTENER:
861: case SSH_CHANNEL_RUNIX_LISTENER:
1.121 markus 862: continue;
863: case SSH_CHANNEL_LARVAL:
864: continue;
865: case SSH_CHANNEL_OPENING:
866: case SSH_CHANNEL_OPEN:
1.372 markus 867: case SSH_CHANNEL_RDYNAMIC_FINISH:
1.121 markus 868: case SSH_CHANNEL_X11_OPEN:
1.302 djm 869: case SSH_CHANNEL_MUX_CLIENT:
1.354 markus 870: case SSH_CHANNEL_MUX_PROXY:
1.121 markus 871: return 1;
872: default:
1.403 djm 873: fatal_f("bad channel type %d", c->type);
1.121 markus 874: /* NOTREACHED */
875: }
876: }
877: return 0;
878: }
879:
880: /* Returns the id of an open channel suitable for keepaliving */
881: int
1.367 djm 882: channel_find_open(struct ssh *ssh)
1.121 markus 883: {
1.209 avsm 884: u_int i;
1.121 markus 885: Channel *c;
886:
1.367 djm 887: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
888: c = ssh->chanctxt->channels[i];
1.368 djm 889: if (c == NULL || !c->have_remote_id)
1.121 markus 890: continue;
891: switch (c->type) {
892: case SSH_CHANNEL_CLOSED:
893: case SSH_CHANNEL_DYNAMIC:
1.372 markus 894: case SSH_CHANNEL_RDYNAMIC_OPEN:
895: case SSH_CHANNEL_RDYNAMIC_FINISH:
1.121 markus 896: case SSH_CHANNEL_X11_LISTENER:
897: case SSH_CHANNEL_PORT_LISTENER:
898: case SSH_CHANNEL_RPORT_LISTENER:
1.302 djm 899: case SSH_CHANNEL_MUX_LISTENER:
900: case SSH_CHANNEL_MUX_CLIENT:
1.354 markus 901: case SSH_CHANNEL_MUX_PROXY:
1.121 markus 902: case SSH_CHANNEL_OPENING:
903: case SSH_CHANNEL_CONNECTING:
904: case SSH_CHANNEL_ZOMBIE:
1.323 dtucker 905: case SSH_CHANNEL_ABANDONED:
1.336 millert 906: case SSH_CHANNEL_UNIX_LISTENER:
907: case SSH_CHANNEL_RUNIX_LISTENER:
1.121 markus 908: continue;
909: case SSH_CHANNEL_LARVAL:
910: case SSH_CHANNEL_AUTH_SOCKET:
911: case SSH_CHANNEL_OPEN:
912: case SSH_CHANNEL_X11_OPEN:
913: return i;
914: default:
1.403 djm 915: fatal_f("bad channel type %d", c->type);
1.121 markus 916: /* NOTREACHED */
917: }
918: }
919: return -1;
920: }
921:
1.385 djm 922: /* Returns the state of the channel's extended usage flag */
923: const char *
924: channel_format_extended_usage(const Channel *c)
925: {
926: if (c->efd == -1)
927: return "closed";
928:
929: switch (c->extended_usage) {
930: case CHAN_EXTENDED_WRITE:
931: return "write";
932: case CHAN_EXTENDED_READ:
933: return "read";
934: case CHAN_EXTENDED_IGNORE:
935: return "ignore";
936: default:
937: return "UNKNOWN";
938: }
939: }
940:
1.386 djm 941: static char *
942: channel_format_status(const Channel *c)
943: {
944: char *ret = NULL;
945:
1.425 djm 946: xasprintf(&ret, "t%d [%s] %s%u i%u/%zu o%u/%zu e[%s]/%zu "
1.411 djm 947: "fd %d/%d/%d sock %d cc %d io 0x%02x/0x%02x",
1.425 djm 948: c->type, c->xctype != NULL ? c->xctype : c->ctype,
1.386 djm 949: c->have_remote_id ? "r" : "nr", c->remote_id,
950: c->istate, sshbuf_len(c->input),
951: c->ostate, sshbuf_len(c->output),
952: channel_format_extended_usage(c), sshbuf_len(c->extended),
1.411 djm 953: c->rfd, c->wfd, c->efd, c->sock, c->ctl_chan,
954: c->io_want, c->io_ready);
1.386 djm 955: return ret;
956: }
957:
1.121 markus 958: /*
959: * Returns a message describing the currently open forwarded connections,
960: * suitable for sending to the client. The message contains crlf pairs for
961: * newlines.
962: */
963: char *
1.367 djm 964: channel_open_message(struct ssh *ssh)
1.121 markus 965: {
1.367 djm 966: struct sshbuf *buf;
1.121 markus 967: Channel *c;
1.209 avsm 968: u_int i;
1.367 djm 969: int r;
1.386 djm 970: char *cp, *ret;
1.121 markus 971:
1.367 djm 972: if ((buf = sshbuf_new()) == NULL)
1.403 djm 973: fatal_f("sshbuf_new");
1.367 djm 974: if ((r = sshbuf_putf(buf,
975: "The following connections are open:\r\n")) != 0)
1.403 djm 976: fatal_fr(r, "sshbuf_putf");
1.367 djm 977: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
978: c = ssh->chanctxt->channels[i];
1.121 markus 979: if (c == NULL)
980: continue;
981: switch (c->type) {
982: case SSH_CHANNEL_X11_LISTENER:
983: case SSH_CHANNEL_PORT_LISTENER:
984: case SSH_CHANNEL_RPORT_LISTENER:
985: case SSH_CHANNEL_CLOSED:
986: case SSH_CHANNEL_AUTH_SOCKET:
987: case SSH_CHANNEL_ZOMBIE:
1.323 dtucker 988: case SSH_CHANNEL_ABANDONED:
1.302 djm 989: case SSH_CHANNEL_MUX_LISTENER:
1.336 millert 990: case SSH_CHANNEL_UNIX_LISTENER:
991: case SSH_CHANNEL_RUNIX_LISTENER:
1.121 markus 992: continue;
993: case SSH_CHANNEL_LARVAL:
994: case SSH_CHANNEL_OPENING:
995: case SSH_CHANNEL_CONNECTING:
996: case SSH_CHANNEL_DYNAMIC:
1.372 markus 997: case SSH_CHANNEL_RDYNAMIC_OPEN:
998: case SSH_CHANNEL_RDYNAMIC_FINISH:
1.121 markus 999: case SSH_CHANNEL_OPEN:
1000: case SSH_CHANNEL_X11_OPEN:
1.354 markus 1001: case SSH_CHANNEL_MUX_PROXY:
1002: case SSH_CHANNEL_MUX_CLIENT:
1.386 djm 1003: cp = channel_format_status(c);
1004: if ((r = sshbuf_putf(buf, " #%d %.300s (%s)\r\n",
1005: c->self, c->remote_name, cp)) != 0) {
1006: free(cp);
1.403 djm 1007: fatal_fr(r, "sshbuf_putf");
1.386 djm 1008: }
1009: free(cp);
1.121 markus 1010: continue;
1011: default:
1.403 djm 1012: fatal_f("bad channel type %d", c->type);
1.121 markus 1013: /* NOTREACHED */
1014: }
1015: }
1.367 djm 1016: if ((ret = sshbuf_dup_string(buf)) == NULL)
1.403 djm 1017: fatal_f("sshbuf_dup_string");
1.367 djm 1018: sshbuf_free(buf);
1019: return ret;
1020: }
1021:
1022: static void
1023: open_preamble(struct ssh *ssh, const char *where, Channel *c, const char *type)
1024: {
1025: int r;
1026:
1027: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
1028: (r = sshpkt_put_cstring(ssh, type)) != 0 ||
1029: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1030: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1031: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0) {
1.403 djm 1032: fatal_r(r, "%s: channel %i: open", where, c->self);
1.367 djm 1033: }
1.121 markus 1034: }
1035:
1036: void
1.367 djm 1037: channel_send_open(struct ssh *ssh, int id)
1.121 markus 1038: {
1.367 djm 1039: Channel *c = channel_lookup(ssh, id);
1040: int r;
1.180 deraadt 1041:
1.121 markus 1042: if (c == NULL) {
1.188 itojun 1043: logit("channel_send_open: %d: bad id", id);
1.121 markus 1044: return;
1045: }
1.184 markus 1046: debug2("channel %d: send open", id);
1.367 djm 1047: open_preamble(ssh, __func__, c, c->ctype);
1048: if ((r = sshpkt_send(ssh)) != 0)
1.403 djm 1049: fatal_fr(r, "channel %i", c->self);
1.121 markus 1050: }
1051:
1052: void
1.367 djm 1053: channel_request_start(struct ssh *ssh, int id, char *service, int wantconfirm)
1.121 markus 1054: {
1.367 djm 1055: Channel *c = channel_lookup(ssh, id);
1056: int r;
1.180 deraadt 1057:
1.121 markus 1058: if (c == NULL) {
1.403 djm 1059: logit_f("%d: unknown channel id", id);
1.121 markus 1060: return;
1061: }
1.368 djm 1062: if (!c->have_remote_id)
1.403 djm 1063: fatal_f("channel %d: no remote id", c->self);
1.368 djm 1064:
1.204 djm 1065: debug2("channel %d: request %s confirm %d", id, service, wantconfirm);
1.367 djm 1066: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_REQUEST)) != 0 ||
1067: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1068: (r = sshpkt_put_cstring(ssh, service)) != 0 ||
1069: (r = sshpkt_put_u8(ssh, wantconfirm)) != 0) {
1.403 djm 1070: fatal_fr(r, "channel %i", c->self);
1.367 djm 1071: }
1.121 markus 1072: }
1.241 deraadt 1073:
1.121 markus 1074: void
1.367 djm 1075: channel_register_status_confirm(struct ssh *ssh, int id,
1076: channel_confirm_cb *cb, channel_confirm_abandon_cb *abandon_cb, void *ctx)
1.275 djm 1077: {
1078: struct channel_confirm *cc;
1079: Channel *c;
1080:
1.367 djm 1081: if ((c = channel_lookup(ssh, id)) == NULL)
1.403 djm 1082: fatal_f("%d: bad id", id);
1.275 djm 1083:
1.327 djm 1084: cc = xcalloc(1, sizeof(*cc));
1.275 djm 1085: cc->cb = cb;
1086: cc->abandon_cb = abandon_cb;
1087: cc->ctx = ctx;
1088: TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry);
1089: }
1090:
1091: void
1.367 djm 1092: channel_register_open_confirm(struct ssh *ssh, int id,
1093: channel_open_fn *fn, void *ctx)
1.121 markus 1094: {
1.367 djm 1095: Channel *c = channel_lookup(ssh, id);
1.180 deraadt 1096:
1.121 markus 1097: if (c == NULL) {
1.403 djm 1098: logit_f("%d: bad id", id);
1.121 markus 1099: return;
1100: }
1.275 djm 1101: c->open_confirm = fn;
1102: c->open_confirm_ctx = ctx;
1.121 markus 1103: }
1.241 deraadt 1104:
1.121 markus 1105: void
1.367 djm 1106: channel_register_cleanup(struct ssh *ssh, int id,
1107: channel_callback_fn *fn, int do_close)
1.121 markus 1108: {
1.367 djm 1109: Channel *c = channel_by_id(ssh, id);
1.180 deraadt 1110:
1.121 markus 1111: if (c == NULL) {
1.403 djm 1112: logit_f("%d: bad id", id);
1.121 markus 1113: return;
1114: }
1.131 markus 1115: c->detach_user = fn;
1.225 djm 1116: c->detach_close = do_close;
1.121 markus 1117: }
1.241 deraadt 1118:
1.121 markus 1119: void
1.367 djm 1120: channel_cancel_cleanup(struct ssh *ssh, int id)
1.121 markus 1121: {
1.367 djm 1122: Channel *c = channel_by_id(ssh, id);
1.180 deraadt 1123:
1.121 markus 1124: if (c == NULL) {
1.403 djm 1125: logit_f("%d: bad id", id);
1.121 markus 1126: return;
1.52 markus 1127: }
1.131 markus 1128: c->detach_user = NULL;
1.225 djm 1129: c->detach_close = 0;
1.121 markus 1130: }
1.241 deraadt 1131:
1.121 markus 1132: void
1.367 djm 1133: channel_register_filter(struct ssh *ssh, int id, channel_infilter_fn *ifn,
1.280 djm 1134: channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx)
1.121 markus 1135: {
1.367 djm 1136: Channel *c = channel_lookup(ssh, id);
1.180 deraadt 1137:
1.121 markus 1138: if (c == NULL) {
1.403 djm 1139: logit_f("%d: bad id", id);
1.121 markus 1140: return;
1.52 markus 1141: }
1.231 reyk 1142: c->input_filter = ifn;
1143: c->output_filter = ofn;
1.279 djm 1144: c->filter_ctx = ctx;
1.280 djm 1145: c->filter_cleanup = cfn;
1.52 markus 1146: }
1147:
1.49 markus 1148: void
1.367 djm 1149: channel_set_fds(struct ssh *ssh, int id, int rfd, int wfd, int efd,
1.282 dtucker 1150: int extusage, int nonblock, int is_tty, u_int window_max)
1.1 deraadt 1151: {
1.367 djm 1152: Channel *c = channel_lookup(ssh, id);
1153: int r;
1.180 deraadt 1154:
1.121 markus 1155: if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
1156: fatal("channel_activate for non-larval channel %d.", id);
1.368 djm 1157: if (!c->have_remote_id)
1.403 djm 1158: fatal_f("channel %d: no remote id", c->self);
1.368 djm 1159:
1.367 djm 1160: channel_register_fds(ssh, c, rfd, wfd, efd, extusage, nonblock, is_tty);
1.121 markus 1161: c->type = SSH_CHANNEL_OPEN;
1.426 ! djm 1162: c->lastused = monotime();
1.168 markus 1163: c->local_window = c->local_window_max = window_max;
1.367 djm 1164:
1165: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST)) != 0 ||
1166: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1167: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1168: (r = sshpkt_send(ssh)) != 0)
1.403 djm 1169: fatal_fr(r, "channel %i", c->self);
1.1 deraadt 1170: }
1171:
1.127 itojun 1172: static void
1.410 djm 1173: channel_pre_listener(struct ssh *ssh, Channel *c)
1.41 markus 1174: {
1.410 djm 1175: c->io_want = SSH_CHAN_IO_SOCK_R;
1.41 markus 1176: }
1177:
1.127 itojun 1178: static void
1.410 djm 1179: channel_pre_connecting(struct ssh *ssh, Channel *c)
1.75 markus 1180: {
1181: debug3("channel %d: waiting for connection", c->self);
1.410 djm 1182: c->io_want = SSH_CHAN_IO_SOCK_W;
1.75 markus 1183: }
1184:
1.127 itojun 1185: static void
1.410 djm 1186: channel_pre_open(struct ssh *ssh, Channel *c)
1.41 markus 1187: {
1.410 djm 1188: c->io_want = 0;
1.44 markus 1189: if (c->istate == CHAN_INPUT_OPEN &&
1.358 djm 1190: c->remote_window > 0 &&
1.367 djm 1191: sshbuf_len(c->input) < c->remote_window &&
1192: sshbuf_check_reserve(c->input, CHAN_RBUF) == 0)
1.410 djm 1193: c->io_want |= SSH_CHAN_IO_RFD;
1.44 markus 1194: if (c->ostate == CHAN_OUTPUT_OPEN ||
1195: c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
1.367 djm 1196: if (sshbuf_len(c->output) > 0) {
1.410 djm 1197: c->io_want |= SSH_CHAN_IO_WFD;
1.44 markus 1198: } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
1.172 markus 1199: if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
1.367 djm 1200: debug2("channel %d: "
1201: "obuf_empty delayed efd %d/(%zu)", c->self,
1202: c->efd, sshbuf_len(c->extended));
1.172 markus 1203: else
1.367 djm 1204: chan_obuf_empty(ssh, c);
1.44 markus 1205: }
1206: }
1207: /** XXX check close conditions, too */
1.358 djm 1208: if (c->efd != -1 && !(c->istate == CHAN_INPUT_CLOSED &&
1209: c->ostate == CHAN_OUTPUT_CLOSED)) {
1.44 markus 1210: if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1.367 djm 1211: sshbuf_len(c->extended) > 0)
1.410 djm 1212: c->io_want |= SSH_CHAN_IO_EFD_W;
1.306 djm 1213: else if (c->efd != -1 && !(c->flags & CHAN_EOF_SENT) &&
1214: (c->extended_usage == CHAN_EXTENDED_READ ||
1215: c->extended_usage == CHAN_EXTENDED_IGNORE) &&
1.367 djm 1216: sshbuf_len(c->extended) < c->remote_window)
1.410 djm 1217: c->io_want |= SSH_CHAN_IO_EFD_R;
1.44 markus 1218: }
1.204 djm 1219: /* XXX: What about efd? races? */
1.44 markus 1220: }
1221:
1.41 markus 1222: /*
1223: * This is a special state for X11 authentication spoofing. An opened X11
1224: * connection (when authentication spoofing is being done) remains in this
1225: * state until the first packet has been completely read. The authentication
1226: * data in that packet is then substituted by the real data if it matches the
1227: * fake data, and the channel is put into normal mode.
1.51 markus 1228: * XXX All this happens at the client side.
1.121 markus 1229: * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
1.41 markus 1230: */
1.127 itojun 1231: static int
1.367 djm 1232: x11_open_helper(struct ssh *ssh, struct sshbuf *b)
1.1 deraadt 1233: {
1.367 djm 1234: struct ssh_channels *sc = ssh->chanctxt;
1.77 markus 1235: u_char *ucp;
1236: u_int proto_len, data_len;
1.25 markus 1237:
1.347 djm 1238: /* Is this being called after the refusal deadline? */
1.367 djm 1239: if (sc->x11_refuse_time != 0 &&
1240: (u_int)monotime() >= sc->x11_refuse_time) {
1.347 djm 1241: verbose("Rejected X11 connection after ForwardX11Timeout "
1242: "expired");
1243: return -1;
1244: }
1245:
1.41 markus 1246: /* Check if the fixed size part of the packet is in buffer. */
1.367 djm 1247: if (sshbuf_len(b) < 12)
1.41 markus 1248: return 0;
1249:
1250: /* Parse the lengths of variable-length fields. */
1.367 djm 1251: ucp = sshbuf_mutable_ptr(b);
1.41 markus 1252: if (ucp[0] == 0x42) { /* Byte order MSB first. */
1253: proto_len = 256 * ucp[6] + ucp[7];
1254: data_len = 256 * ucp[8] + ucp[9];
1255: } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
1256: proto_len = ucp[6] + 256 * ucp[7];
1257: data_len = ucp[8] + 256 * ucp[9];
1258: } else {
1.194 markus 1259: debug2("Initial X11 packet contains bad byte order byte: 0x%x",
1.148 deraadt 1260: ucp[0]);
1.41 markus 1261: return -1;
1262: }
1263:
1264: /* Check if the whole packet is in buffer. */
1.367 djm 1265: if (sshbuf_len(b) <
1.41 markus 1266: 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
1267: return 0;
1268:
1269: /* Check if authentication protocol matches. */
1.367 djm 1270: if (proto_len != strlen(sc->x11_saved_proto) ||
1271: memcmp(ucp + 12, sc->x11_saved_proto, proto_len) != 0) {
1.194 markus 1272: debug2("X11 connection uses different authentication protocol.");
1.41 markus 1273: return -1;
1274: }
1275: /* Check if authentication data matches our fake data. */
1.367 djm 1276: if (data_len != sc->x11_fake_data_len ||
1.308 djm 1277: timingsafe_bcmp(ucp + 12 + ((proto_len + 3) & ~3),
1.367 djm 1278: sc->x11_fake_data, sc->x11_fake_data_len) != 0) {
1.194 markus 1279: debug2("X11 auth data does not match fake data.");
1.41 markus 1280: return -1;
1281: }
1282: /* Check fake data length */
1.367 djm 1283: if (sc->x11_fake_data_len != sc->x11_saved_data_len) {
1.41 markus 1284: error("X11 fake_data_len %d != saved_data_len %d",
1.367 djm 1285: sc->x11_fake_data_len, sc->x11_saved_data_len);
1.41 markus 1286: return -1;
1287: }
1288: /*
1289: * Received authentication protocol and data match
1290: * our fake data. Substitute the fake data with real
1291: * data.
1292: */
1293: memcpy(ucp + 12 + ((proto_len + 3) & ~3),
1.367 djm 1294: sc->x11_saved_data, sc->x11_saved_data_len);
1.41 markus 1295: return 1;
1296: }
1297:
1.423 djm 1298: void
1299: channel_force_close(struct ssh *ssh, Channel *c, int abandon)
1300: {
1301: debug3_f("channel %d: forcibly closing", c->self);
1302: if (c->istate == CHAN_INPUT_OPEN)
1303: chan_read_failed(ssh, c);
1304: if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
1305: sshbuf_reset(c->input);
1306: chan_ibuf_empty(ssh, c);
1307: }
1308: if (c->ostate == CHAN_OUTPUT_OPEN ||
1309: c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
1310: sshbuf_reset(c->output);
1311: chan_write_failed(ssh, c);
1312: }
1313: if (c->detach_user)
1314: c->detach_user(ssh, c->self, 1, NULL);
1315: if (c->efd != -1)
1316: channel_close_fd(ssh, c, &c->efd);
1317: if (abandon)
1318: c->type = SSH_CHANNEL_ABANDONED;
1.426 ! djm 1319: /* exempt from inactivity timeouts */
! 1320: c->inactive_deadline = 0;
! 1321: c->lastused = 0;
1.423 djm 1322: }
1323:
1.127 itojun 1324: static void
1.410 djm 1325: channel_pre_x11_open(struct ssh *ssh, Channel *c)
1.41 markus 1326: {
1.367 djm 1327: int ret = x11_open_helper(ssh, c->output);
1.133 markus 1328:
1329: /* c->force_drain = 1; */
1330:
1.41 markus 1331: if (ret == 1) {
1332: c->type = SSH_CHANNEL_OPEN;
1.426 ! djm 1333: c->lastused = monotime();
1.410 djm 1334: channel_pre_open(ssh, c);
1.41 markus 1335: } else if (ret == -1) {
1.423 djm 1336: logit("X11 connection rejected because of wrong "
1337: "authentication.");
1.367 djm 1338: debug2("X11 rejected %d i%d/o%d",
1339: c->self, c->istate, c->ostate);
1.423 djm 1340: channel_force_close(ssh, c, 0);
1.41 markus 1341: }
1342: }
1.25 markus 1343:
1.302 djm 1344: static void
1.410 djm 1345: channel_pre_mux_client(struct ssh *ssh, Channel *c)
1.302 djm 1346: {
1.410 djm 1347: c->io_want = 0;
1.304 djm 1348: if (c->istate == CHAN_INPUT_OPEN && !c->mux_pause &&
1.367 djm 1349: sshbuf_check_reserve(c->input, CHAN_RBUF) == 0)
1.410 djm 1350: c->io_want |= SSH_CHAN_IO_RFD;
1.302 djm 1351: if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
1352: /* clear buffer immediately (discard any partial packet) */
1.367 djm 1353: sshbuf_reset(c->input);
1354: chan_ibuf_empty(ssh, c);
1.302 djm 1355: /* Start output drain. XXX just kill chan? */
1.367 djm 1356: chan_rcvd_oclose(ssh, c);
1.302 djm 1357: }
1358: if (c->ostate == CHAN_OUTPUT_OPEN ||
1359: c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
1.367 djm 1360: if (sshbuf_len(c->output) > 0)
1.410 djm 1361: c->io_want |= SSH_CHAN_IO_WFD;
1.302 djm 1362: else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN)
1.367 djm 1363: chan_obuf_empty(ssh, c);
1.302 djm 1364: }
1365: }
1366:
1.104 markus 1367: /* try to decode a socks4 header */
1.127 itojun 1368: static int
1.372 markus 1369: channel_decode_socks4(Channel *c, struct sshbuf *input, struct sshbuf *output)
1.103 markus 1370: {
1.367 djm 1371: const u_char *p;
1372: char *host;
1.292 djm 1373: u_int len, have, i, found, need;
1.148 deraadt 1374: char username[256];
1.103 markus 1375: struct {
1376: u_int8_t version;
1377: u_int8_t command;
1378: u_int16_t dest_port;
1.104 markus 1379: struct in_addr dest_addr;
1.103 markus 1380: } s4_req, s4_rsp;
1.367 djm 1381: int r;
1.103 markus 1382:
1.104 markus 1383: debug2("channel %d: decode socks4", c->self);
1.109 markus 1384:
1.372 markus 1385: have = sshbuf_len(input);
1.109 markus 1386: len = sizeof(s4_req);
1387: if (have < len)
1388: return 0;
1.372 markus 1389: p = sshbuf_ptr(input);
1.292 djm 1390:
1391: need = 1;
1392: /* SOCKS4A uses an invalid IP address 0.0.0.x */
1393: if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) {
1394: debug2("channel %d: socks4a request", c->self);
1395: /* ... and needs an extra string (the hostname) */
1396: need = 2;
1397: }
1398: /* Check for terminating NUL on the string(s) */
1.109 markus 1399: for (found = 0, i = len; i < have; i++) {
1400: if (p[i] == '\0') {
1.292 djm 1401: found++;
1402: if (found == need)
1403: break;
1.109 markus 1404: }
1405: if (i > 1024) {
1406: /* the peer is probably sending garbage */
1407: debug("channel %d: decode socks4: too long",
1408: c->self);
1409: return -1;
1410: }
1411: }
1.292 djm 1412: if (found < need)
1.109 markus 1413: return 0;
1.372 markus 1414: if ((r = sshbuf_get(input, &s4_req.version, 1)) != 0 ||
1415: (r = sshbuf_get(input, &s4_req.command, 1)) != 0 ||
1416: (r = sshbuf_get(input, &s4_req.dest_port, 2)) != 0 ||
1417: (r = sshbuf_get(input, &s4_req.dest_addr, 4)) != 0) {
1.403 djm 1418: debug_r(r, "channels %d: decode socks4", c->self);
1.367 djm 1419: return -1;
1420: }
1.372 markus 1421: have = sshbuf_len(input);
1422: p = sshbuf_ptr(input);
1.364 djm 1423: if (memchr(p, '\0', have) == NULL) {
1.403 djm 1424: error("channel %d: decode socks4: unterminated user", c->self);
1.364 djm 1425: return -1;
1426: }
1.103 markus 1427: len = strlen(p);
1.106 markus 1428: debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
1.367 djm 1429: len++; /* trailing '\0' */
1.103 markus 1430: strlcpy(username, p, sizeof(username));
1.403 djm 1431: if ((r = sshbuf_consume(input, len)) != 0)
1432: fatal_fr(r, "channel %d: consume", c->self);
1.321 djm 1433: free(c->path);
1434: c->path = NULL;
1.292 djm 1435: if (need == 1) { /* SOCKS4: one string */
1436: host = inet_ntoa(s4_req.dest_addr);
1.293 djm 1437: c->path = xstrdup(host);
1.292 djm 1438: } else { /* SOCKS4A: two strings */
1.372 markus 1439: have = sshbuf_len(input);
1440: p = sshbuf_ptr(input);
1.364 djm 1441: if (memchr(p, '\0', have) == NULL) {
1442: error("channel %d: decode socks4a: host not nul "
1443: "terminated", c->self);
1444: return -1;
1445: }
1.292 djm 1446: len = strlen(p);
1447: debug2("channel %d: decode socks4a: host %s/%d",
1448: c->self, p, len);
1449: len++; /* trailing '\0' */
1.293 djm 1450: if (len > NI_MAXHOST) {
1.292 djm 1451: error("channel %d: hostname \"%.100s\" too long",
1452: c->self, p);
1453: return -1;
1454: }
1.293 djm 1455: c->path = xstrdup(p);
1.403 djm 1456: if ((r = sshbuf_consume(input, len)) != 0)
1457: fatal_fr(r, "channel %d: consume", c->self);
1.292 djm 1458: }
1.103 markus 1459: c->host_port = ntohs(s4_req.dest_port);
1.148 deraadt 1460:
1.194 markus 1461: debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
1.292 djm 1462: c->self, c->path, c->host_port, s4_req.command);
1.103 markus 1463:
1.104 markus 1464: if (s4_req.command != 1) {
1.292 djm 1465: debug("channel %d: cannot handle: %s cn %d",
1466: c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command);
1.104 markus 1467: return -1;
1.103 markus 1468: }
1.104 markus 1469: s4_rsp.version = 0; /* vn: 0 for reply */
1470: s4_rsp.command = 90; /* cd: req granted */
1.103 markus 1471: s4_rsp.dest_port = 0; /* ignored */
1.104 markus 1472: s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
1.403 djm 1473: if ((r = sshbuf_put(output, &s4_rsp, sizeof(s4_rsp))) != 0)
1474: fatal_fr(r, "channel %d: append reply", c->self);
1.104 markus 1475: return 1;
1476: }
1477:
1.193 markus 1478: /* try to decode a socks5 header */
1479: #define SSH_SOCKS5_AUTHDONE 0x1000
1480: #define SSH_SOCKS5_NOAUTH 0x00
1481: #define SSH_SOCKS5_IPV4 0x01
1482: #define SSH_SOCKS5_DOMAIN 0x03
1483: #define SSH_SOCKS5_IPV6 0x04
1484: #define SSH_SOCKS5_CONNECT 0x01
1485: #define SSH_SOCKS5_SUCCESS 0x00
1486:
1487: static int
1.372 markus 1488: channel_decode_socks5(Channel *c, struct sshbuf *input, struct sshbuf *output)
1.193 markus 1489: {
1.367 djm 1490: /* XXX use get/put_u8 instead of trusting struct padding */
1.193 markus 1491: struct {
1492: u_int8_t version;
1493: u_int8_t command;
1494: u_int8_t reserved;
1495: u_int8_t atyp;
1496: } s5_req, s5_rsp;
1497: u_int16_t dest_port;
1.324 djm 1498: char dest_addr[255+1], ntop[INET6_ADDRSTRLEN];
1.367 djm 1499: const u_char *p;
1.252 djm 1500: u_int have, need, i, found, nmethods, addrlen, af;
1.367 djm 1501: int r;
1.193 markus 1502:
1503: debug2("channel %d: decode socks5", c->self);
1.372 markus 1504: p = sshbuf_ptr(input);
1.193 markus 1505: if (p[0] != 0x05)
1506: return -1;
1.372 markus 1507: have = sshbuf_len(input);
1.193 markus 1508: if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
1509: /* format: ver | nmethods | methods */
1.198 djm 1510: if (have < 2)
1.193 markus 1511: return 0;
1512: nmethods = p[1];
1513: if (have < nmethods + 2)
1514: return 0;
1515: /* look for method: "NO AUTHENTICATION REQUIRED" */
1.268 stevesk 1516: for (found = 0, i = 2; i < nmethods + 2; i++) {
1.264 stevesk 1517: if (p[i] == SSH_SOCKS5_NOAUTH) {
1.193 markus 1518: found = 1;
1519: break;
1520: }
1521: }
1522: if (!found) {
1523: debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
1524: c->self);
1525: return -1;
1526: }
1.403 djm 1527: if ((r = sshbuf_consume(input, nmethods + 2)) != 0)
1528: fatal_fr(r, "channel %d: consume", c->self);
1.367 djm 1529: /* version, method */
1.372 markus 1530: if ((r = sshbuf_put_u8(output, 0x05)) != 0 ||
1.403 djm 1531: (r = sshbuf_put_u8(output, SSH_SOCKS5_NOAUTH)) != 0)
1532: fatal_fr(r, "channel %d: append reply", c->self);
1.193 markus 1533: c->flags |= SSH_SOCKS5_AUTHDONE;
1534: debug2("channel %d: socks5 auth done", c->self);
1535: return 0; /* need more */
1536: }
1537: debug2("channel %d: socks5 post auth", c->self);
1538: if (have < sizeof(s5_req)+1)
1539: return 0; /* need more */
1.247 deraadt 1540: memcpy(&s5_req, p, sizeof(s5_req));
1.193 markus 1541: if (s5_req.version != 0x05 ||
1542: s5_req.command != SSH_SOCKS5_CONNECT ||
1543: s5_req.reserved != 0x00) {
1.194 markus 1544: debug2("channel %d: only socks5 connect supported", c->self);
1.193 markus 1545: return -1;
1546: }
1.213 deraadt 1547: switch (s5_req.atyp){
1.193 markus 1548: case SSH_SOCKS5_IPV4:
1549: addrlen = 4;
1550: af = AF_INET;
1551: break;
1552: case SSH_SOCKS5_DOMAIN:
1553: addrlen = p[sizeof(s5_req)];
1554: af = -1;
1555: break;
1556: case SSH_SOCKS5_IPV6:
1557: addrlen = 16;
1558: af = AF_INET6;
1559: break;
1560: default:
1.194 markus 1561: debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
1.193 markus 1562: return -1;
1563: }
1.252 djm 1564: need = sizeof(s5_req) + addrlen + 2;
1565: if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1566: need++;
1567: if (have < need)
1.193 markus 1568: return 0;
1.403 djm 1569: if ((r = sshbuf_consume(input, sizeof(s5_req))) != 0)
1570: fatal_fr(r, "channel %d: consume", c->self);
1.367 djm 1571: if (s5_req.atyp == SSH_SOCKS5_DOMAIN) {
1572: /* host string length */
1.403 djm 1573: if ((r = sshbuf_consume(input, 1)) != 0)
1574: fatal_fr(r, "channel %d: consume", c->self);
1.367 djm 1575: }
1.372 markus 1576: if ((r = sshbuf_get(input, &dest_addr, addrlen)) != 0 ||
1577: (r = sshbuf_get(input, &dest_port, 2)) != 0) {
1.403 djm 1578: debug_r(r, "channel %d: parse addr/port", c->self);
1.367 djm 1579: return -1;
1580: }
1.193 markus 1581: dest_addr[addrlen] = '\0';
1.321 djm 1582: free(c->path);
1583: c->path = NULL;
1.293 djm 1584: if (s5_req.atyp == SSH_SOCKS5_DOMAIN) {
1.294 djm 1585: if (addrlen >= NI_MAXHOST) {
1.293 djm 1586: error("channel %d: dynamic request: socks5 hostname "
1587: "\"%.100s\" too long", c->self, dest_addr);
1588: return -1;
1589: }
1590: c->path = xstrdup(dest_addr);
1591: } else {
1592: if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL)
1593: return -1;
1594: c->path = xstrdup(ntop);
1595: }
1.193 markus 1596: c->host_port = ntohs(dest_port);
1.198 djm 1597:
1.194 markus 1598: debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
1.193 markus 1599: c->self, c->path, c->host_port, s5_req.command);
1600:
1601: s5_rsp.version = 0x05;
1602: s5_rsp.command = SSH_SOCKS5_SUCCESS;
1603: s5_rsp.reserved = 0; /* ignored */
1604: s5_rsp.atyp = SSH_SOCKS5_IPV4;
1605: dest_port = 0; /* ignored */
1606:
1.372 markus 1607: if ((r = sshbuf_put(output, &s5_rsp, sizeof(s5_rsp))) != 0 ||
1608: (r = sshbuf_put_u32(output, ntohl(INADDR_ANY))) != 0 ||
1609: (r = sshbuf_put(output, &dest_port, sizeof(dest_port))) != 0)
1.403 djm 1610: fatal_fr(r, "channel %d: append reply", c->self);
1.193 markus 1611: return 1;
1.301 dtucker 1612: }
1613:
1614: Channel *
1.367 djm 1615: channel_connect_stdio_fwd(struct ssh *ssh,
1.407 djm 1616: const char *host_to_connect, u_short port_to_connect,
1617: int in, int out, int nonblock)
1.301 dtucker 1618: {
1619: Channel *c;
1620:
1.403 djm 1621: debug_f("%s:%d", host_to_connect, port_to_connect);
1.301 dtucker 1622:
1.367 djm 1623: c = channel_new(ssh, "stdio-forward", SSH_CHANNEL_OPENING, in, out,
1.301 dtucker 1624: -1, CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1.407 djm 1625: 0, "stdio-forward", nonblock);
1.301 dtucker 1626:
1627: c->path = xstrdup(host_to_connect);
1628: c->host_port = port_to_connect;
1629: c->listening_port = 0;
1630: c->force_drain = 1;
1631:
1.367 djm 1632: channel_register_fds(ssh, c, in, out, -1, 0, 1, 0);
1633: port_open_helper(ssh, c, "direct-tcpip");
1.301 dtucker 1634:
1635: return c;
1.193 markus 1636: }
1637:
1.104 markus 1638: /* dynamic port forwarding */
1.127 itojun 1639: static void
1.410 djm 1640: channel_pre_dynamic(struct ssh *ssh, Channel *c)
1.104 markus 1641: {
1.367 djm 1642: const u_char *p;
1.217 djm 1643: u_int have;
1644: int ret;
1.103 markus 1645:
1.410 djm 1646: c->io_want = 0;
1.367 djm 1647: have = sshbuf_len(c->input);
1.104 markus 1648: debug2("channel %d: pre_dynamic: have %d", c->self, have);
1.367 djm 1649: /* sshbuf_dump(c->input, stderr); */
1.104 markus 1650: /* check if the fixed size part of the packet is in buffer. */
1.193 markus 1651: if (have < 3) {
1.104 markus 1652: /* need more */
1.410 djm 1653: c->io_want |= SSH_CHAN_IO_RFD;
1.104 markus 1654: return;
1655: }
1656: /* try to guess the protocol */
1.367 djm 1657: p = sshbuf_ptr(c->input);
1658: /* XXX sshbuf_peek_u8? */
1.104 markus 1659: switch (p[0]) {
1660: case 0x04:
1.372 markus 1661: ret = channel_decode_socks4(c, c->input, c->output);
1.193 markus 1662: break;
1663: case 0x05:
1.372 markus 1664: ret = channel_decode_socks5(c, c->input, c->output);
1.104 markus 1665: break;
1666: default:
1667: ret = -1;
1668: break;
1669: }
1670: if (ret < 0) {
1.367 djm 1671: chan_mark_dead(ssh, c);
1.104 markus 1672: } else if (ret == 0) {
1673: debug2("channel %d: pre_dynamic: need more", c->self);
1674: /* need more */
1.410 djm 1675: c->io_want |= SSH_CHAN_IO_RFD;
1.372 markus 1676: if (sshbuf_len(c->output))
1.410 djm 1677: c->io_want |= SSH_CHAN_IO_WFD;
1.104 markus 1678: } else {
1679: /* switch to the next state */
1680: c->type = SSH_CHANNEL_OPENING;
1.367 djm 1681: port_open_helper(ssh, c, "direct-tcpip");
1.104 markus 1682: }
1.103 markus 1683: }
1684:
1.372 markus 1685: /* simulate read-error */
1686: static void
1687: rdynamic_close(struct ssh *ssh, Channel *c)
1688: {
1689: c->type = SSH_CHANNEL_OPEN;
1.423 djm 1690: channel_force_close(ssh, c, 0);
1.372 markus 1691: }
1692:
1693: /* reverse dynamic port forwarding */
1694: static void
1.411 djm 1695: channel_before_prepare_io_rdynamic(struct ssh *ssh, Channel *c)
1.372 markus 1696: {
1697: const u_char *p;
1698: u_int have, len;
1699: int r, ret;
1700:
1701: have = sshbuf_len(c->output);
1702: debug2("channel %d: pre_rdynamic: have %d", c->self, have);
1703: /* sshbuf_dump(c->output, stderr); */
1704: /* EOF received */
1705: if (c->flags & CHAN_EOF_RCVD) {
1.403 djm 1706: if ((r = sshbuf_consume(c->output, have)) != 0)
1707: fatal_fr(r, "channel %d: consume", c->self);
1.372 markus 1708: rdynamic_close(ssh, c);
1709: return;
1710: }
1711: /* check if the fixed size part of the packet is in buffer. */
1712: if (have < 3)
1713: return;
1714: /* try to guess the protocol */
1715: p = sshbuf_ptr(c->output);
1716: switch (p[0]) {
1717: case 0x04:
1718: /* switch input/output for reverse forwarding */
1719: ret = channel_decode_socks4(c, c->output, c->input);
1720: break;
1721: case 0x05:
1722: ret = channel_decode_socks5(c, c->output, c->input);
1723: break;
1724: default:
1725: ret = -1;
1726: break;
1727: }
1728: if (ret < 0) {
1729: rdynamic_close(ssh, c);
1730: } else if (ret == 0) {
1731: debug2("channel %d: pre_rdynamic: need more", c->self);
1732: /* send socks request to peer */
1733: len = sshbuf_len(c->input);
1734: if (len > 0 && len < c->remote_window) {
1735: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_DATA)) != 0 ||
1736: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1737: (r = sshpkt_put_stringb(ssh, c->input)) != 0 ||
1738: (r = sshpkt_send(ssh)) != 0) {
1.403 djm 1739: fatal_fr(r, "channel %i: rdynamic", c->self);
1.372 markus 1740: }
1.403 djm 1741: if ((r = sshbuf_consume(c->input, len)) != 0)
1742: fatal_fr(r, "channel %d: consume", c->self);
1.372 markus 1743: c->remote_window -= len;
1744: }
1745: } else if (rdynamic_connect_finish(ssh, c) < 0) {
1746: /* the connect failed */
1747: rdynamic_close(ssh, c);
1748: }
1749: }
1750:
1.41 markus 1751: /* This is our fake X11 server socket. */
1.127 itojun 1752: static void
1.410 djm 1753: channel_post_x11_listener(struct ssh *ssh, Channel *c)
1.41 markus 1754: {
1.113 markus 1755: Channel *nc;
1.285 djm 1756: struct sockaddr_storage addr;
1.367 djm 1757: int r, newsock, oerrno, remote_port;
1.41 markus 1758: socklen_t addrlen;
1.85 markus 1759: char buf[16384], *remote_ipaddr;
1.25 markus 1760:
1.410 djm 1761: if ((c->io_ready & SSH_CHAN_IO_SOCK_R) == 0)
1.367 djm 1762: return;
1763:
1764: debug("X11 connection requested.");
1765: addrlen = sizeof(addr);
1766: newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
1767: if (c->single_connection) {
1768: oerrno = errno;
1769: debug2("single_connection: closing X11 listener.");
1.407 djm 1770: channel_close_fd(ssh, c, &c->sock);
1.367 djm 1771: chan_mark_dead(ssh, c);
1772: errno = oerrno;
1773: }
1.393 deraadt 1774: if (newsock == -1) {
1.367 djm 1775: if (errno != EINTR && errno != EWOULDBLOCK &&
1776: errno != ECONNABORTED)
1777: error("accept: %.100s", strerror(errno));
1778: if (errno == EMFILE || errno == ENFILE)
1779: c->notbefore = monotime() + 1;
1780: return;
1781: }
1782: set_nodelay(newsock);
1783: remote_ipaddr = get_peer_ipaddr(newsock);
1784: remote_port = get_peer_port(newsock);
1785: snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
1786: remote_ipaddr, remote_port);
1787:
1.424 djm 1788: nc = channel_new(ssh, "x11-connection",
1.367 djm 1789: SSH_CHANNEL_OPENING, newsock, newsock, -1,
1790: c->local_window_max, c->local_maxpacket, 0, buf, 1);
1791: open_preamble(ssh, __func__, nc, "x11");
1.378 djm 1792: if ((r = sshpkt_put_cstring(ssh, remote_ipaddr)) != 0 ||
1793: (r = sshpkt_put_u32(ssh, remote_port)) != 0) {
1.403 djm 1794: fatal_fr(r, "channel %i: reply", c->self);
1.41 markus 1795: }
1.367 djm 1796: if ((r = sshpkt_send(ssh)) != 0)
1.403 djm 1797: fatal_fr(r, "channel %i: send", c->self);
1.367 djm 1798: free(remote_ipaddr);
1.41 markus 1799: }
1.25 markus 1800:
1.127 itojun 1801: static void
1.367 djm 1802: port_open_helper(struct ssh *ssh, Channel *c, char *rtype)
1.103 markus 1803: {
1.328 djm 1804: char *local_ipaddr = get_local_ipaddr(c->sock);
1.350 djm 1805: int local_port = c->sock == -1 ? 65536 : get_local_port(c->sock);
1.103 markus 1806: char *remote_ipaddr = get_peer_ipaddr(c->sock);
1.216 markus 1807: int remote_port = get_peer_port(c->sock);
1.367 djm 1808: int r;
1.303 djm 1809:
1810: if (remote_port == -1) {
1811: /* Fake addr/port to appease peers that validate it (Tectia) */
1.321 djm 1812: free(remote_ipaddr);
1.303 djm 1813: remote_ipaddr = xstrdup("127.0.0.1");
1814: remote_port = 65535;
1815: }
1.103 markus 1816:
1.367 djm 1817: free(c->remote_name);
1818: xasprintf(&c->remote_name,
1.103 markus 1819: "%s: listening port %d for %.100s port %d, "
1.328 djm 1820: "connect from %.200s port %d to %.100s port %d",
1.103 markus 1821: rtype, c->listening_port, c->path, c->host_port,
1.328 djm 1822: remote_ipaddr, remote_port, local_ipaddr, local_port);
1.103 markus 1823:
1.367 djm 1824: open_preamble(ssh, __func__, c, rtype);
1.358 djm 1825: if (strcmp(rtype, "direct-tcpip") == 0) {
1826: /* target host, port */
1.367 djm 1827: if ((r = sshpkt_put_cstring(ssh, c->path)) != 0 ||
1.403 djm 1828: (r = sshpkt_put_u32(ssh, c->host_port)) != 0)
1829: fatal_fr(r, "channel %i: reply", c->self);
1.358 djm 1830: } else if (strcmp(rtype, "direct-streamlocal@openssh.com") == 0) {
1831: /* target path */
1.403 djm 1832: if ((r = sshpkt_put_cstring(ssh, c->path)) != 0)
1833: fatal_fr(r, "channel %i: reply", c->self);
1.358 djm 1834: } else if (strcmp(rtype, "forwarded-streamlocal@openssh.com") == 0) {
1835: /* listen path */
1.403 djm 1836: if ((r = sshpkt_put_cstring(ssh, c->path)) != 0)
1837: fatal_fr(r, "channel %i: reply", c->self);
1.103 markus 1838: } else {
1.358 djm 1839: /* listen address, port */
1.367 djm 1840: if ((r = sshpkt_put_cstring(ssh, c->path)) != 0 ||
1.403 djm 1841: (r = sshpkt_put_u32(ssh, local_port)) != 0)
1842: fatal_fr(r, "channel %i: reply", c->self);
1.358 djm 1843: }
1844: if (strcmp(rtype, "forwarded-streamlocal@openssh.com") == 0) {
1845: /* reserved for future owner/mode info */
1.403 djm 1846: if ((r = sshpkt_put_cstring(ssh, "")) != 0)
1847: fatal_fr(r, "channel %i: reply", c->self);
1.358 djm 1848: } else {
1849: /* originator host and port */
1.367 djm 1850: if ((r = sshpkt_put_cstring(ssh, remote_ipaddr)) != 0 ||
1.403 djm 1851: (r = sshpkt_put_u32(ssh, (u_int)remote_port)) != 0)
1852: fatal_fr(r, "channel %i: reply", c->self);
1.103 markus 1853: }
1.367 djm 1854: if ((r = sshpkt_send(ssh)) != 0)
1.403 djm 1855: fatal_fr(r, "channel %i: send", c->self);
1.321 djm 1856: free(remote_ipaddr);
1.328 djm 1857: free(local_ipaddr);
1.103 markus 1858: }
1859:
1.347 djm 1860: void
1.367 djm 1861: channel_set_x11_refuse_time(struct ssh *ssh, u_int refuse_time)
1.347 djm 1862: {
1.367 djm 1863: ssh->chanctxt->x11_refuse_time = refuse_time;
1.226 djm 1864: }
1865:
1.41 markus 1866: /*
1867: * This socket is listening for connections to a forwarded TCP/IP port.
1868: */
1.127 itojun 1869: static void
1.410 djm 1870: channel_post_port_listener(struct ssh *ssh, Channel *c)
1.41 markus 1871: {
1.103 markus 1872: Channel *nc;
1.285 djm 1873: struct sockaddr_storage addr;
1.113 markus 1874: int newsock, nextstate;
1.41 markus 1875: socklen_t addrlen;
1.103 markus 1876: char *rtype;
1.73 markus 1877:
1.410 djm 1878: if ((c->io_ready & SSH_CHAN_IO_SOCK_R) == 0)
1.367 djm 1879: return;
1880:
1881: debug("Connection to port %d forwarding to %.100s port %d requested.",
1882: c->listening_port, c->path, c->host_port);
1.103 markus 1883:
1.367 djm 1884: if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1885: nextstate = SSH_CHANNEL_OPENING;
1886: rtype = "forwarded-tcpip";
1887: } else if (c->type == SSH_CHANNEL_RUNIX_LISTENER) {
1888: nextstate = SSH_CHANNEL_OPENING;
1889: rtype = "forwarded-streamlocal@openssh.com";
1890: } else if (c->host_port == PORT_STREAMLOCAL) {
1891: nextstate = SSH_CHANNEL_OPENING;
1892: rtype = "direct-streamlocal@openssh.com";
1893: } else if (c->host_port == 0) {
1894: nextstate = SSH_CHANNEL_DYNAMIC;
1895: rtype = "dynamic-tcpip";
1896: } else {
1897: nextstate = SSH_CHANNEL_OPENING;
1898: rtype = "direct-tcpip";
1899: }
1.103 markus 1900:
1.367 djm 1901: addrlen = sizeof(addr);
1902: newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
1.393 deraadt 1903: if (newsock == -1) {
1.367 djm 1904: if (errno != EINTR && errno != EWOULDBLOCK &&
1905: errno != ECONNABORTED)
1906: error("accept: %.100s", strerror(errno));
1907: if (errno == EMFILE || errno == ENFILE)
1908: c->notbefore = monotime() + 1;
1909: return;
1.41 markus 1910: }
1.367 djm 1911: if (c->host_port != PORT_STREAMLOCAL)
1912: set_nodelay(newsock);
1913: nc = channel_new(ssh, rtype, nextstate, newsock, newsock, -1,
1914: c->local_window_max, c->local_maxpacket, 0, rtype, 1);
1915: nc->listening_port = c->listening_port;
1916: nc->host_port = c->host_port;
1917: if (c->path != NULL)
1918: nc->path = xstrdup(c->path);
1919:
1920: if (nextstate != SSH_CHANNEL_DYNAMIC)
1921: port_open_helper(ssh, nc, rtype);
1.41 markus 1922: }
1.25 markus 1923:
1.41 markus 1924: /*
1925: * This is the authentication agent socket listening for connections from
1926: * clients.
1927: */
1.127 itojun 1928: static void
1.410 djm 1929: channel_post_auth_listener(struct ssh *ssh, Channel *c)
1.41 markus 1930: {
1.113 markus 1931: Channel *nc;
1.367 djm 1932: int r, newsock;
1.285 djm 1933: struct sockaddr_storage addr;
1.41 markus 1934: socklen_t addrlen;
1.25 markus 1935:
1.410 djm 1936: if ((c->io_ready & SSH_CHAN_IO_SOCK_R) == 0)
1.367 djm 1937: return;
1938:
1939: addrlen = sizeof(addr);
1940: newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
1.393 deraadt 1941: if (newsock == -1) {
1.367 djm 1942: error("accept from auth socket: %.100s", strerror(errno));
1943: if (errno == EMFILE || errno == ENFILE)
1944: c->notbefore = monotime() + 1;
1945: return;
1.41 markus 1946: }
1.424 djm 1947: nc = channel_new(ssh, "agent-connection",
1.367 djm 1948: SSH_CHANNEL_OPENING, newsock, newsock, -1,
1949: c->local_window_max, c->local_maxpacket,
1950: 0, "accepted auth socket", 1);
1951: open_preamble(ssh, __func__, nc, "auth-agent@openssh.com");
1952: if ((r = sshpkt_send(ssh)) != 0)
1.403 djm 1953: fatal_fr(r, "channel %i", c->self);
1.41 markus 1954: }
1.25 markus 1955:
1.127 itojun 1956: static void
1.410 djm 1957: channel_post_connecting(struct ssh *ssh, Channel *c)
1.75 markus 1958: {
1.372 markus 1959: int err = 0, sock, isopen, r;
1.129 stevesk 1960: socklen_t sz = sizeof(err);
1.114 markus 1961:
1.410 djm 1962: if ((c->io_ready & SSH_CHAN_IO_SOCK_W) == 0)
1.367 djm 1963: return;
1.368 djm 1964: if (!c->have_remote_id)
1.403 djm 1965: fatal_f("channel %d: no remote id", c->self);
1.372 markus 1966: /* for rdynamic the OPEN_CONFIRMATION has been sent already */
1967: isopen = (c->type == SSH_CHANNEL_RDYNAMIC_FINISH);
1.393 deraadt 1968: if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) == -1) {
1.367 djm 1969: err = errno;
1970: error("getsockopt SO_ERROR failed");
1971: }
1972: if (err == 0) {
1973: debug("channel %d: connected to %s port %d",
1974: c->self, c->connect_ctx.host, c->connect_ctx.port);
1975: channel_connect_ctx_free(&c->connect_ctx);
1976: c->type = SSH_CHANNEL_OPEN;
1.426 ! djm 1977: c->lastused = monotime();
1.372 markus 1978: if (isopen) {
1979: /* no message necessary */
1980: } else {
1981: if ((r = sshpkt_start(ssh,
1982: SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
1983: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1984: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1985: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1.403 djm 1986: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 ||
1987: (r = sshpkt_send(ssh)) != 0)
1988: fatal_fr(r, "channel %i open confirm", c->self);
1.367 djm 1989: }
1990: } else {
1991: debug("channel %d: connection failed: %s",
1992: c->self, strerror(err));
1993: /* Try next address, if any */
1994: if ((sock = connect_next(&c->connect_ctx)) > 0) {
1995: close(c->sock);
1996: c->sock = c->rfd = c->wfd = sock;
1997: return;
1998: }
1999: /* Exhausted all addresses */
2000: error("connect_to %.100s port %d: failed.",
2001: c->connect_ctx.host, c->connect_ctx.port);
2002: channel_connect_ctx_free(&c->connect_ctx);
1.372 markus 2003: if (isopen) {
2004: rdynamic_close(ssh, c);
2005: } else {
2006: if ((r = sshpkt_start(ssh,
2007: SSH2_MSG_CHANNEL_OPEN_FAILURE)) != 0 ||
2008: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1.378 djm 2009: (r = sshpkt_put_u32(ssh,
2010: SSH2_OPEN_CONNECT_FAILED)) != 0 ||
2011: (r = sshpkt_put_cstring(ssh, strerror(err))) != 0 ||
1.403 djm 2012: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
2013: (r = sshpkt_send(ssh)) != 0)
2014: fatal_fr(r, "channel %i: failure", c->self);
1.372 markus 2015: chan_mark_dead(ssh, c);
1.75 markus 2016: }
2017: }
2018: }
2019:
1.127 itojun 2020: static int
1.410 djm 2021: channel_handle_rfd(struct ssh *ssh, Channel *c)
1.41 markus 2022: {
1.214 markus 2023: char buf[CHAN_RBUF];
1.367 djm 2024: ssize_t len;
2025: int r;
1.426 ! djm 2026: size_t nr = 0, have, avail, maxlen = CHANNEL_MAX_READ;
1.25 markus 2027:
1.410 djm 2028: if ((c->io_ready & SSH_CHAN_IO_RFD) == 0)
1.412 djm 2029: return 1; /* Shouldn't happen */
2030: if ((avail = sshbuf_avail(c->input)) == 0)
2031: return 1; /* Shouldn't happen */
2032:
2033: /*
2034: * For "simple" channels (i.e. not datagram or filtered), we can
2035: * read directly to the channel buffer.
2036: */
2037: if (c->input_filter == NULL && !c->datagram) {
2038: /* Only OPEN channels have valid rwin */
2039: if (c->type == SSH_CHANNEL_OPEN) {
2040: if ((have = sshbuf_len(c->input)) >= c->remote_window)
2041: return 1; /* shouldn't happen */
2042: if (maxlen > c->remote_window - have)
2043: maxlen = c->remote_window - have;
2044: }
2045: if (maxlen > avail)
2046: maxlen = avail;
1.426 ! djm 2047: if ((r = sshbuf_read(c->rfd, c->input, maxlen, &nr)) != 0) {
1.413 djm 2048: if (errno == EINTR || errno == EAGAIN)
2049: return 1;
1.412 djm 2050: debug2("channel %d: read failed rfd %d maxlen %zu: %s",
2051: c->self, c->rfd, maxlen, ssh_err(r));
2052: goto rfail;
2053: }
1.426 ! djm 2054: if (nr != 0)
! 2055: c->lastused = monotime();
1.367 djm 2056: return 1;
1.412 djm 2057: }
1.367 djm 2058:
2059: len = read(c->rfd, buf, sizeof(buf));
1.393 deraadt 2060: if (len == -1 && (errno == EINTR || errno == EAGAIN))
1.367 djm 2061: return 1;
2062: if (len <= 0) {
1.412 djm 2063: debug2("channel %d: read<=0 rfd %d len %zd: %s",
2064: c->self, c->rfd, len,
2065: len == 0 ? "closed" : strerror(errno));
2066: rfail:
1.367 djm 2067: if (c->type != SSH_CHANNEL_OPEN) {
2068: debug2("channel %d: not open", c->self);
2069: chan_mark_dead(ssh, c);
1.41 markus 2070: return -1;
1.65 markus 2071: } else {
1.367 djm 2072: chan_read_failed(ssh, c);
1.65 markus 2073: }
1.367 djm 2074: return -1;
2075: }
1.426 ! djm 2076: c->lastused = monotime();
1.367 djm 2077: if (c->input_filter != NULL) {
2078: if (c->input_filter(ssh, c, buf, len) == -1) {
2079: debug2("channel %d: filter stops", c->self);
2080: chan_read_failed(ssh, c);
2081: }
2082: } else if (c->datagram) {
2083: if ((r = sshbuf_put_string(c->input, buf, len)) != 0)
1.403 djm 2084: fatal_fr(r, "channel %i: put datagram", c->self);
1.412 djm 2085: }
1.41 markus 2086: return 1;
2087: }
1.241 deraadt 2088:
1.127 itojun 2089: static int
1.410 djm 2090: channel_handle_wfd(struct ssh *ssh, Channel *c)
1.41 markus 2091: {
1.95 markus 2092: struct termios tio;
1.367 djm 2093: u_char *data = NULL, *buf; /* XXX const; need filter API change */
2094: size_t dlen, olen = 0;
2095: int r, len;
2096:
1.410 djm 2097: if ((c->io_ready & SSH_CHAN_IO_WFD) == 0)
2098: return 1;
2099: if (sshbuf_len(c->output) == 0)
1.367 djm 2100: return 1;
1.25 markus 2101:
1.41 markus 2102: /* Send buffered output data to the socket. */
1.367 djm 2103: olen = sshbuf_len(c->output);
2104: if (c->output_filter != NULL) {
2105: if ((buf = c->output_filter(ssh, c, &data, &dlen)) == NULL) {
2106: debug2("channel %d: filter stops", c->self);
2107: if (c->type != SSH_CHANNEL_OPEN)
2108: chan_mark_dead(ssh, c);
2109: else
2110: chan_write_failed(ssh, c);
2111: return -1;
1.231 reyk 2112: }
1.367 djm 2113: } else if (c->datagram) {
2114: if ((r = sshbuf_get_string(c->output, &data, &dlen)) != 0)
1.403 djm 2115: fatal_fr(r, "channel %i: get datagram", c->self);
1.369 djm 2116: buf = data;
1.367 djm 2117: } else {
2118: buf = data = sshbuf_mutable_ptr(c->output);
2119: dlen = sshbuf_len(c->output);
2120: }
1.231 reyk 2121:
1.367 djm 2122: if (c->datagram) {
2123: /* ignore truncated writes, datagrams might get lost */
1.374 djm 2124: len = write(c->wfd, buf, dlen);
1.367 djm 2125: free(data);
1.393 deraadt 2126: if (len == -1 && (errno == EINTR || errno == EAGAIN))
1.53 markus 2127: return 1;
1.367 djm 2128: if (len <= 0)
2129: goto write_fail;
2130: goto out;
2131: }
2132:
2133: len = write(c->wfd, buf, dlen);
1.393 deraadt 2134: if (len == -1 && (errno == EINTR || errno == EAGAIN))
1.367 djm 2135: return 1;
2136: if (len <= 0) {
2137: write_fail:
2138: if (c->type != SSH_CHANNEL_OPEN) {
2139: debug2("channel %d: not open", c->self);
2140: chan_mark_dead(ssh, c);
1.41 markus 2141: return -1;
1.367 djm 2142: } else {
2143: chan_write_failed(ssh, c);
1.91 markus 2144: }
1.367 djm 2145: return -1;
2146: }
1.426 ! djm 2147: c->lastused = monotime();
1.367 djm 2148: if (c->isatty && dlen >= 1 && buf[0] != '\r') {
2149: if (tcgetattr(c->wfd, &tio) == 0 &&
2150: !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
2151: /*
2152: * Simulate echo to reduce the impact of
2153: * traffic analysis. We need to match the
2154: * size of a SSH2_MSG_CHANNEL_DATA message
2155: * (4 byte channel id + buf)
2156: */
2157: if ((r = sshpkt_msg_ignore(ssh, 4+len)) != 0 ||
2158: (r = sshpkt_send(ssh)) != 0)
1.403 djm 2159: fatal_fr(r, "channel %i: ignore", c->self);
1.25 markus 2160: }
1.367 djm 2161: }
1.403 djm 2162: if ((r = sshbuf_consume(c->output, len)) != 0)
2163: fatal_fr(r, "channel %i: consume", c->self);
1.309 djm 2164: out:
1.367 djm 2165: c->local_consumed += olen - sshbuf_len(c->output);
2166:
2167: return 1;
2168: }
2169:
2170: static int
1.410 djm 2171: channel_handle_efd_write(struct ssh *ssh, Channel *c)
1.367 djm 2172: {
2173: int r;
2174: ssize_t len;
2175:
1.410 djm 2176: if ((c->io_ready & SSH_CHAN_IO_EFD_W) == 0)
2177: return 1;
2178: if (sshbuf_len(c->extended) == 0)
1.367 djm 2179: return 1;
2180:
2181: len = write(c->efd, sshbuf_ptr(c->extended),
2182: sshbuf_len(c->extended));
2183: debug2("channel %d: written %zd to efd %d", c->self, len, c->efd);
1.393 deraadt 2184: if (len == -1 && (errno == EINTR || errno == EAGAIN))
1.367 djm 2185: return 1;
2186: if (len <= 0) {
2187: debug2("channel %d: closing write-efd %d", c->self, c->efd);
1.407 djm 2188: channel_close_fd(ssh, c, &c->efd);
1.367 djm 2189: } else {
1.403 djm 2190: if ((r = sshbuf_consume(c->extended, len)) != 0)
2191: fatal_fr(r, "channel %i: consume", c->self);
1.367 djm 2192: c->local_consumed += len;
1.426 ! djm 2193: c->lastused = monotime();
1.367 djm 2194: }
1.44 markus 2195: return 1;
2196: }
1.241 deraadt 2197:
1.127 itojun 2198: static int
1.410 djm 2199: channel_handle_efd_read(struct ssh *ssh, Channel *c)
1.44 markus 2200: {
1.214 markus 2201: char buf[CHAN_RBUF];
1.367 djm 2202: int r;
2203: ssize_t len;
2204:
1.410 djm 2205: if ((c->io_ready & SSH_CHAN_IO_EFD_R) == 0)
1.367 djm 2206: return 1;
1.44 markus 2207:
1.367 djm 2208: len = read(c->efd, buf, sizeof(buf));
2209: debug2("channel %d: read %zd from efd %d", c->self, len, c->efd);
1.393 deraadt 2210: if (len == -1 && (errno == EINTR || errno == EAGAIN))
1.367 djm 2211: return 1;
2212: if (len <= 0) {
1.403 djm 2213: debug2("channel %d: closing read-efd %d", c->self, c->efd);
1.407 djm 2214: channel_close_fd(ssh, c, &c->efd);
1.426 ! djm 2215: return 1;
! 2216: }
! 2217: c->lastused = monotime();
! 2218: if (c->extended_usage == CHAN_EXTENDED_IGNORE)
1.403 djm 2219: debug3("channel %d: discard efd", c->self);
2220: else if ((r = sshbuf_put(c->extended, buf, len)) != 0)
2221: fatal_fr(r, "channel %i: append", c->self);
1.44 markus 2222: return 1;
2223: }
1.241 deraadt 2224:
1.127 itojun 2225: static int
1.410 djm 2226: channel_handle_efd(struct ssh *ssh, Channel *c)
1.44 markus 2227: {
1.367 djm 2228: if (c->efd == -1)
2229: return 1;
2230:
2231: /** XXX handle drain efd, too */
2232:
2233: if (c->extended_usage == CHAN_EXTENDED_WRITE)
1.410 djm 2234: return channel_handle_efd_write(ssh, c);
1.367 djm 2235: else if (c->extended_usage == CHAN_EXTENDED_READ ||
2236: c->extended_usage == CHAN_EXTENDED_IGNORE)
1.410 djm 2237: return channel_handle_efd_read(ssh, c);
1.367 djm 2238:
2239: return 1;
2240: }
2241:
2242: static int
2243: channel_check_window(struct ssh *ssh, Channel *c)
2244: {
2245: int r;
2246:
1.104 markus 2247: if (c->type == SSH_CHANNEL_OPEN &&
2248: !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
1.270 dtucker 2249: ((c->local_window_max - c->local_window >
1.269 markus 2250: c->local_maxpacket*3) ||
2251: c->local_window < c->local_window_max/2) &&
1.44 markus 2252: c->local_consumed > 0) {
1.368 djm 2253: if (!c->have_remote_id)
1.403 djm 2254: fatal_f("channel %d: no remote id", c->self);
1.367 djm 2255: if ((r = sshpkt_start(ssh,
2256: SSH2_MSG_CHANNEL_WINDOW_ADJUST)) != 0 ||
2257: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
2258: (r = sshpkt_put_u32(ssh, c->local_consumed)) != 0 ||
2259: (r = sshpkt_send(ssh)) != 0) {
1.403 djm 2260: fatal_fr(r, "channel %i", c->self);
1.367 djm 2261: }
1.403 djm 2262: debug2("channel %d: window %d sent adjust %d", c->self,
2263: c->local_window, c->local_consumed);
1.44 markus 2264: c->local_window += c->local_consumed;
2265: c->local_consumed = 0;
1.1 deraadt 2266: }
1.41 markus 2267: return 1;
1.1 deraadt 2268: }
2269:
1.127 itojun 2270: static void
1.410 djm 2271: channel_post_open(struct ssh *ssh, Channel *c)
1.41 markus 2272: {
1.410 djm 2273: channel_handle_rfd(ssh, c);
2274: channel_handle_wfd(ssh, c);
2275: channel_handle_efd(ssh, c);
1.367 djm 2276: channel_check_window(ssh, c);
1.44 markus 2277: }
2278:
1.302 djm 2279: static u_int
1.367 djm 2280: read_mux(struct ssh *ssh, Channel *c, u_int need)
1.302 djm 2281: {
2282: char buf[CHAN_RBUF];
1.367 djm 2283: ssize_t len;
1.302 djm 2284: u_int rlen;
1.367 djm 2285: int r;
1.302 djm 2286:
1.367 djm 2287: if (sshbuf_len(c->input) < need) {
2288: rlen = need - sshbuf_len(c->input);
1.352 deraadt 2289: len = read(c->rfd, buf, MINIMUM(rlen, CHAN_RBUF));
1.393 deraadt 2290: if (len == -1 && (errno == EINTR || errno == EAGAIN))
1.367 djm 2291: return sshbuf_len(c->input);
1.302 djm 2292: if (len <= 0) {
1.367 djm 2293: debug2("channel %d: ctl read<=0 rfd %d len %zd",
1.349 naddy 2294: c->self, c->rfd, len);
1.367 djm 2295: chan_read_failed(ssh, c);
1.349 naddy 2296: return 0;
1.403 djm 2297: } else if ((r = sshbuf_put(c->input, buf, len)) != 0)
2298: fatal_fr(r, "channel %i: append", c->self);
1.302 djm 2299: }
1.367 djm 2300: return sshbuf_len(c->input);
1.302 djm 2301: }
2302:
2303: static void
1.410 djm 2304: channel_post_mux_client_read(struct ssh *ssh, Channel *c)
1.302 djm 2305: {
2306: u_int need;
2307:
1.410 djm 2308: if ((c->io_ready & SSH_CHAN_IO_RFD) == 0)
1.367 djm 2309: return;
2310: if (c->istate != CHAN_INPUT_OPEN && c->istate != CHAN_INPUT_WAIT_DRAIN)
2311: return;
2312: if (c->mux_pause)
2313: return;
2314:
2315: /*
2316: * Don't not read past the precise end of packets to
2317: * avoid disrupting fd passing.
2318: */
2319: if (read_mux(ssh, c, 4) < 4) /* read header */
2320: return;
2321: /* XXX sshbuf_peek_u32 */
2322: need = PEEK_U32(sshbuf_ptr(c->input));
1.302 djm 2323: #define CHANNEL_MUX_MAX_PACKET (256 * 1024)
1.367 djm 2324: if (need > CHANNEL_MUX_MAX_PACKET) {
2325: debug2("channel %d: packet too big %u > %u",
2326: c->self, CHANNEL_MUX_MAX_PACKET, need);
2327: chan_rcvd_oclose(ssh, c);
2328: return;
2329: }
2330: if (read_mux(ssh, c, need + 4) < need + 4) /* read body */
2331: return;
2332: if (c->mux_rcb(ssh, c) != 0) {
2333: debug("channel %d: mux_rcb failed", c->self);
2334: chan_mark_dead(ssh, c);
2335: return;
1.302 djm 2336: }
1.367 djm 2337: }
2338:
2339: static void
1.410 djm 2340: channel_post_mux_client_write(struct ssh *ssh, Channel *c)
1.367 djm 2341: {
2342: ssize_t len;
2343: int r;
1.302 djm 2344:
1.410 djm 2345: if ((c->io_ready & SSH_CHAN_IO_WFD) == 0)
2346: return;
2347: if (sshbuf_len(c->output) == 0)
1.367 djm 2348: return;
2349:
2350: len = write(c->wfd, sshbuf_ptr(c->output), sshbuf_len(c->output));
1.393 deraadt 2351: if (len == -1 && (errno == EINTR || errno == EAGAIN))
1.367 djm 2352: return;
2353: if (len <= 0) {
2354: chan_mark_dead(ssh, c);
2355: return;
1.302 djm 2356: }
1.367 djm 2357: if ((r = sshbuf_consume(c->output, len)) != 0)
1.403 djm 2358: fatal_fr(r, "channel %i: consume", c->self);
1.367 djm 2359: }
2360:
2361: static void
1.410 djm 2362: channel_post_mux_client(struct ssh *ssh, Channel *c)
1.367 djm 2363: {
1.410 djm 2364: channel_post_mux_client_read(ssh, c);
2365: channel_post_mux_client_write(ssh, c);
1.302 djm 2366: }
2367:
2368: static void
1.410 djm 2369: channel_post_mux_listener(struct ssh *ssh, Channel *c)
1.302 djm 2370: {
2371: Channel *nc;
2372: struct sockaddr_storage addr;
2373: socklen_t addrlen;
2374: int newsock;
2375: uid_t euid;
2376: gid_t egid;
2377:
1.410 djm 2378: if ((c->io_ready & SSH_CHAN_IO_SOCK_R) == 0)
1.302 djm 2379: return;
2380:
2381: debug("multiplexing control connection");
2382:
2383: /*
2384: * Accept connection on control socket
2385: */
2386: memset(&addr, 0, sizeof(addr));
2387: addrlen = sizeof(addr);
2388: if ((newsock = accept(c->sock, (struct sockaddr*)&addr,
2389: &addrlen)) == -1) {
1.403 djm 2390: error_f("accept: %s", strerror(errno));
1.317 djm 2391: if (errno == EMFILE || errno == ENFILE)
1.322 dtucker 2392: c->notbefore = monotime() + 1;
1.302 djm 2393: return;
2394: }
2395:
1.393 deraadt 2396: if (getpeereid(newsock, &euid, &egid) == -1) {
1.403 djm 2397: error_f("getpeereid failed: %s", strerror(errno));
1.302 djm 2398: close(newsock);
2399: return;
2400: }
2401: if ((euid != 0) && (getuid() != euid)) {
2402: error("multiplex uid mismatch: peer euid %u != uid %u",
2403: (u_int)euid, (u_int)getuid());
2404: close(newsock);
2405: return;
2406: }
1.424 djm 2407: nc = channel_new(ssh, "mux-control", SSH_CHANNEL_MUX_CLIENT,
1.302 djm 2408: newsock, newsock, -1, c->local_window_max,
2409: c->local_maxpacket, 0, "mux-control", 1);
2410: nc->mux_rcb = c->mux_rcb;
1.403 djm 2411: debug3_f("new mux channel %d fd %d", nc->self, nc->sock);
1.302 djm 2412: /* establish state */
1.367 djm 2413: nc->mux_rcb(ssh, nc);
1.302 djm 2414: /* mux state transitions must not elicit protocol messages */
2415: nc->flags |= CHAN_LOCAL;
2416: }
2417:
1.127 itojun 2418: static void
1.367 djm 2419: channel_handler_init(struct ssh_channels *sc)
1.1 deraadt 2420: {
1.367 djm 2421: chan_fn **pre, **post;
2422:
2423: if ((pre = calloc(SSH_CHANNEL_MAX_TYPE, sizeof(*pre))) == NULL ||
1.406 djm 2424: (post = calloc(SSH_CHANNEL_MAX_TYPE, sizeof(*post))) == NULL)
1.403 djm 2425: fatal_f("allocation failed");
1.367 djm 2426:
2427: pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
2428: pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
2429: pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
2430: pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
2431: pre[SSH_CHANNEL_UNIX_LISTENER] = &channel_pre_listener;
2432: pre[SSH_CHANNEL_RUNIX_LISTENER] = &channel_pre_listener;
2433: pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
2434: pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
2435: pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
2436: pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.372 markus 2437: pre[SSH_CHANNEL_RDYNAMIC_FINISH] = &channel_pre_connecting;
1.367 djm 2438: pre[SSH_CHANNEL_MUX_LISTENER] = &channel_pre_listener;
2439: pre[SSH_CHANNEL_MUX_CLIENT] = &channel_pre_mux_client;
2440:
2441: post[SSH_CHANNEL_OPEN] = &channel_post_open;
2442: post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
2443: post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
2444: post[SSH_CHANNEL_UNIX_LISTENER] = &channel_post_port_listener;
2445: post[SSH_CHANNEL_RUNIX_LISTENER] = &channel_post_port_listener;
2446: post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
2447: post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
2448: post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
2449: post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
1.372 markus 2450: post[SSH_CHANNEL_RDYNAMIC_FINISH] = &channel_post_connecting;
1.367 djm 2451: post[SSH_CHANNEL_MUX_LISTENER] = &channel_post_mux_listener;
2452: post[SSH_CHANNEL_MUX_CLIENT] = &channel_post_mux_client;
1.180 deraadt 2453:
1.367 djm 2454: sc->channel_pre = pre;
2455: sc->channel_post = post;
1.44 markus 2456: }
2457:
1.140 markus 2458: /* gc dead channels */
2459: static void
1.367 djm 2460: channel_garbage_collect(struct ssh *ssh, Channel *c)
1.140 markus 2461: {
2462: if (c == NULL)
2463: return;
2464: if (c->detach_user != NULL) {
1.367 djm 2465: if (!chan_is_dead(ssh, c, c->detach_close))
1.140 markus 2466: return;
1.385 djm 2467:
1.194 markus 2468: debug2("channel %d: gc: notify user", c->self);
1.423 djm 2469: c->detach_user(ssh, c->self, 0, NULL);
1.140 markus 2470: /* if we still have a callback */
2471: if (c->detach_user != NULL)
2472: return;
1.194 markus 2473: debug2("channel %d: gc: user detached", c->self);
1.140 markus 2474: }
1.367 djm 2475: if (!chan_is_dead(ssh, c, 1))
1.140 markus 2476: return;
1.194 markus 2477: debug2("channel %d: garbage collecting", c->self);
1.367 djm 2478: channel_free(ssh, c);
1.140 markus 2479: }
2480:
1.367 djm 2481: enum channel_table { CHAN_PRE, CHAN_POST };
2482:
1.127 itojun 2483: static void
1.422 djm 2484: channel_handler(struct ssh *ssh, int table, struct timespec *timeout)
1.41 markus 2485: {
1.367 djm 2486: struct ssh_channels *sc = ssh->chanctxt;
2487: chan_fn **ftab = table == CHAN_PRE ? sc->channel_pre : sc->channel_post;
1.299 markus 2488: u_int i, oalloc;
1.41 markus 2489: Channel *c;
1.317 djm 2490: time_t now;
1.25 markus 2491:
1.322 dtucker 2492: now = monotime();
1.367 djm 2493: for (i = 0, oalloc = sc->channels_alloc; i < oalloc; i++) {
2494: c = sc->channels[i];
1.113 markus 2495: if (c == NULL)
1.41 markus 2496: continue;
1.417 djm 2497: /* Try to keep IO going while rekeying */
2498: if (ssh_packet_is_rekeying(ssh) && c->type != SSH_CHANNEL_OPEN)
2499: continue;
1.299 markus 2500: if (c->delayed) {
1.367 djm 2501: if (table == CHAN_PRE)
1.299 markus 2502: c->delayed = 0;
2503: else
2504: continue;
2505: }
1.317 djm 2506: if (ftab[c->type] != NULL) {
1.426 ! djm 2507: if (table == CHAN_PRE &&
! 2508: c->type == SSH_CHANNEL_OPEN &&
! 2509: c->inactive_deadline != 0 && c->lastused != 0 &&
! 2510: now >= c->lastused + c->inactive_deadline) {
! 2511: /* channel closed for inactivity */
! 2512: verbose("channel %d: closing after %u seconds "
! 2513: "of inactivity", c->self,
! 2514: c->inactive_deadline);
! 2515: channel_force_close(ssh, c, 1);
! 2516: } else if (c->notbefore <= now) {
! 2517: /* Run handlers that are not paused. */
1.410 djm 2518: (*ftab[c->type])(ssh, c);
1.426 ! djm 2519: /* inactivity timeouts must interrupt poll() */
! 2520: if (timeout != NULL &&
! 2521: c->type == SSH_CHANNEL_OPEN &&
! 2522: c->lastused != 0 &&
! 2523: c->inactive_deadline != 0) {
! 2524: ptimeout_deadline_monotime(timeout,
! 2525: c->lastused + c->inactive_deadline);
! 2526: }
! 2527: } else if (timeout != NULL) {
1.317 djm 2528: /*
1.426 ! djm 2529: * Arrange for poll() wakeup when channel pause
1.422 djm 2530: * timer expires.
1.317 djm 2531: */
1.422 djm 2532: ptimeout_deadline_monotime(timeout,
2533: c->notbefore);
1.317 djm 2534: }
2535: }
1.367 djm 2536: channel_garbage_collect(ssh, c);
1.1 deraadt 2537: }
2538: }
2539:
1.121 markus 2540: /*
1.411 djm 2541: * Create sockets before preparing IO.
1.372 markus 2542: * This is necessary for things that need to happen after reading
1.411 djm 2543: * the network-input but need to be completed before IO event setup, e.g.
2544: * because they may create new channels.
1.372 markus 2545: */
2546: static void
1.411 djm 2547: channel_before_prepare_io(struct ssh *ssh)
1.372 markus 2548: {
2549: struct ssh_channels *sc = ssh->chanctxt;
2550: Channel *c;
2551: u_int i, oalloc;
2552:
2553: for (i = 0, oalloc = sc->channels_alloc; i < oalloc; i++) {
2554: c = sc->channels[i];
2555: if (c == NULL)
2556: continue;
2557: if (c->type == SSH_CHANNEL_RDYNAMIC_OPEN)
1.411 djm 2558: channel_before_prepare_io_rdynamic(ssh, c);
2559: }
2560: }
2561:
2562: static void
2563: dump_channel_poll(const char *func, const char *what, Channel *c,
2564: u_int pollfd_offset, struct pollfd *pfd)
2565: {
2566: #ifdef DEBUG_CHANNEL_POLL
1.415 djm 2567: debug3("%s: channel %d: %s r%d w%d e%d s%d c->pfds [ %d %d %d %d ] "
2568: "io_want 0x%02x io_ready 0x%02x pfd[%u].fd=%d "
2569: "pfd.ev 0x%02x pfd.rev 0x%02x", func, c->self, what,
2570: c->rfd, c->wfd, c->efd, c->sock,
2571: c->pfds[0], c->pfds[1], c->pfds[2], c->pfds[3],
2572: c->io_want, c->io_ready,
2573: pollfd_offset, pfd->fd, pfd->events, pfd->revents);
1.411 djm 2574: #endif
2575: }
2576:
2577: /* Prepare pollfd entries for a single channel */
2578: static void
2579: channel_prepare_pollfd(Channel *c, u_int *next_pollfd,
2580: struct pollfd *pfd, u_int npfd)
2581: {
1.415 djm 2582: u_int ev, p = *next_pollfd;
1.411 djm 2583:
2584: if (c == NULL)
2585: return;
2586: if (p + 4 > npfd) {
2587: /* Shouldn't happen */
2588: fatal_f("channel %d: bad pfd offset %u (max %u)",
2589: c->self, p, npfd);
2590: }
1.415 djm 2591: c->pfds[0] = c->pfds[1] = c->pfds[2] = c->pfds[3] = -1;
1.411 djm 2592: /*
2593: * prepare c->rfd
2594: *
2595: * This is a special case, since c->rfd might be the same as
2596: * c->wfd, c->efd and/or c->sock. Handle those here if they want
2597: * IO too.
2598: */
2599: if (c->rfd != -1) {
1.415 djm 2600: ev = 0;
1.411 djm 2601: if ((c->io_want & SSH_CHAN_IO_RFD) != 0)
1.415 djm 2602: ev |= POLLIN;
1.411 djm 2603: /* rfd == wfd */
1.415 djm 2604: if (c->wfd == c->rfd) {
2605: if ((c->io_want & SSH_CHAN_IO_WFD) != 0)
2606: ev |= POLLOUT;
2607: }
1.411 djm 2608: /* rfd == efd */
1.415 djm 2609: if (c->efd == c->rfd) {
2610: if ((c->io_want & SSH_CHAN_IO_EFD_R) != 0)
2611: ev |= POLLIN;
2612: if ((c->io_want & SSH_CHAN_IO_EFD_W) != 0)
2613: ev |= POLLOUT;
2614: }
1.411 djm 2615: /* rfd == sock */
1.415 djm 2616: if (c->sock == c->rfd) {
2617: if ((c->io_want & SSH_CHAN_IO_SOCK_R) != 0)
2618: ev |= POLLIN;
2619: if ((c->io_want & SSH_CHAN_IO_SOCK_W) != 0)
2620: ev |= POLLOUT;
2621: }
2622: /* Pack a pfd entry if any event armed for this fd */
2623: if (ev != 0) {
2624: c->pfds[0] = p;
2625: pfd[p].fd = c->rfd;
2626: pfd[p].events = ev;
2627: dump_channel_poll(__func__, "rfd", c, p, &pfd[p]);
2628: p++;
2629: }
1.411 djm 2630: }
1.415 djm 2631: /* prepare c->wfd if wanting IO and not already handled above */
1.411 djm 2632: if (c->wfd != -1 && c->rfd != c->wfd) {
1.415 djm 2633: ev = 0;
2634: if ((c->io_want & SSH_CHAN_IO_WFD))
2635: ev |= POLLOUT;
2636: /* Pack a pfd entry if any event armed for this fd */
2637: if (ev != 0) {
2638: c->pfds[1] = p;
2639: pfd[p].fd = c->wfd;
2640: pfd[p].events = ev;
2641: dump_channel_poll(__func__, "wfd", c, p, &pfd[p]);
2642: p++;
2643: }
1.411 djm 2644: }
1.415 djm 2645: /* prepare c->efd if wanting IO and not already handled above */
1.411 djm 2646: if (c->efd != -1 && c->rfd != c->efd) {
1.415 djm 2647: ev = 0;
1.411 djm 2648: if ((c->io_want & SSH_CHAN_IO_EFD_R) != 0)
1.415 djm 2649: ev |= POLLIN;
1.411 djm 2650: if ((c->io_want & SSH_CHAN_IO_EFD_W) != 0)
1.415 djm 2651: ev |= POLLOUT;
2652: /* Pack a pfd entry if any event armed for this fd */
2653: if (ev != 0) {
2654: c->pfds[2] = p;
2655: pfd[p].fd = c->efd;
2656: pfd[p].events = ev;
2657: dump_channel_poll(__func__, "efd", c, p, &pfd[p]);
2658: p++;
2659: }
1.411 djm 2660: }
1.415 djm 2661: /* prepare c->sock if wanting IO and not already handled above */
1.411 djm 2662: if (c->sock != -1 && c->rfd != c->sock) {
1.415 djm 2663: ev = 0;
1.411 djm 2664: if ((c->io_want & SSH_CHAN_IO_SOCK_R) != 0)
1.415 djm 2665: ev |= POLLIN;
1.411 djm 2666: if ((c->io_want & SSH_CHAN_IO_SOCK_W) != 0)
1.415 djm 2667: ev |= POLLOUT;
2668: /* Pack a pfd entry if any event armed for this fd */
2669: if (ev != 0) {
2670: c->pfds[3] = p;
2671: pfd[p].fd = c->sock;
2672: pfd[p].events = 0;
2673: dump_channel_poll(__func__, "sock", c, p, &pfd[p]);
2674: p++;
2675: }
1.372 markus 2676: }
1.411 djm 2677: *next_pollfd = p;
1.372 markus 2678: }
2679:
1.411 djm 2680: /* * Allocate/prepare poll structure */
1.49 markus 2681: void
1.411 djm 2682: channel_prepare_poll(struct ssh *ssh, struct pollfd **pfdp, u_int *npfd_allocp,
1.422 djm 2683: u_int *npfd_activep, u_int npfd_reserved, struct timespec *timeout)
1.41 markus 2684: {
1.410 djm 2685: struct ssh_channels *sc = ssh->chanctxt;
1.411 djm 2686: u_int i, oalloc, p, npfd = npfd_reserved;
2687:
2688: channel_before_prepare_io(ssh); /* might create a new channel */
1.416 djm 2689: /* clear out I/O flags from last poll */
2690: for (i = 0; i < sc->channels_alloc; i++) {
2691: if (sc->channels[i] == NULL)
2692: continue;
2693: sc->channels[i]->io_want = sc->channels[i]->io_ready = 0;
2694: }
1.411 djm 2695: /* Allocate 4x pollfd for each channel (rfd, wfd, efd, sock) */
2696: if (sc->channels_alloc >= (INT_MAX / 4) - npfd_reserved)
2697: fatal_f("too many channels"); /* shouldn't happen */
1.417 djm 2698: npfd += sc->channels_alloc * 4;
1.411 djm 2699: if (npfd > *npfd_allocp) {
2700: *pfdp = xrecallocarray(*pfdp, *npfd_allocp,
2701: npfd, sizeof(**pfdp));
2702: *npfd_allocp = npfd;
2703: }
2704: *npfd_activep = npfd_reserved;
2705: oalloc = sc->channels_alloc;
1.372 markus 2706:
1.422 djm 2707: channel_handler(ssh, CHAN_PRE, timeout);
1.84 markus 2708:
1.411 djm 2709: if (oalloc != sc->channels_alloc) {
2710: /* shouldn't happen */
2711: fatal_f("channels_alloc changed during CHAN_PRE "
2712: "(was %u, now %u)", oalloc, sc->channels_alloc);
2713: }
1.84 markus 2714:
1.411 djm 2715: /* Prepare pollfd */
2716: p = npfd_reserved;
2717: for (i = 0; i < sc->channels_alloc; i++)
2718: channel_prepare_pollfd(sc->channels[i], &p, *pfdp, npfd);
2719: *npfd_activep = p;
2720: }
2721:
2722: static void
1.415 djm 2723: fd_ready(Channel *c, int p, struct pollfd *pfds, u_int npfd, int fd,
1.411 djm 2724: const char *what, u_int revents_mask, u_int ready)
2725: {
2726: struct pollfd *pfd = &pfds[p];
1.410 djm 2727:
1.411 djm 2728: if (fd == -1)
2729: return;
1.415 djm 2730: if (p == -1 || (u_int)p >= npfd)
2731: fatal_f("channel %d: bad pfd %d (max %u)", c->self, p, npfd);
1.411 djm 2732: dump_channel_poll(__func__, what, c, p, pfd);
2733: if (pfd->fd != fd) {
2734: fatal("channel %d: inconsistent %s fd=%d pollfd[%u].fd %d "
2735: "r%d w%d e%d s%d", c->self, what, fd, p, pfd->fd,
2736: c->rfd, c->wfd, c->efd, c->sock);
2737: }
2738: if ((pfd->revents & POLLNVAL) != 0) {
2739: fatal("channel %d: invalid %s pollfd[%u].fd %d r%d w%d e%d s%d",
2740: c->self, what, p, pfd->fd, c->rfd, c->wfd, c->efd, c->sock);
1.410 djm 2741: }
1.411 djm 2742: if ((pfd->revents & (revents_mask|POLLHUP|POLLERR)) != 0)
2743: c->io_ready |= ready & c->io_want;
1.41 markus 2744: }
2745:
1.121 markus 2746: /*
1.411 djm 2747: * After poll, perform any appropriate operations for channels which have
1.121 markus 2748: * events pending.
2749: */
1.49 markus 2750: void
1.411 djm 2751: channel_after_poll(struct ssh *ssh, struct pollfd *pfd, u_int npfd)
1.41 markus 2752: {
1.410 djm 2753: struct ssh_channels *sc = ssh->chanctxt;
1.415 djm 2754: u_int i;
2755: int p;
1.410 djm 2756: Channel *c;
2757:
1.411 djm 2758: #ifdef DEBUG_CHANNEL_POLL
1.415 djm 2759: for (p = 0; p < (int)npfd; p++) {
1.411 djm 2760: if (pfd[p].revents == 0)
2761: continue;
2762: debug_f("pfd[%u].fd %d rev 0x%04x",
2763: p, pfd[p].fd, pfd[p].revents);
2764: }
2765: #endif
2766:
2767: /* Convert pollfd into c->io_ready */
2768: for (i = 0; i < sc->channels_alloc; i++) {
1.410 djm 2769: c = sc->channels[i];
1.415 djm 2770: if (c == NULL)
1.410 djm 2771: continue;
1.411 djm 2772: /* if rfd is shared with efd/sock then wfd should be too */
2773: if (c->rfd != -1 && c->wfd != -1 && c->rfd != c->wfd &&
2774: (c->rfd == c->efd || c->rfd == c->sock)) {
2775: /* Shouldn't happen */
2776: fatal_f("channel %d: unexpected fds r%d w%d e%d s%d",
2777: c->self, c->rfd, c->wfd, c->efd, c->sock);
2778: }
1.410 djm 2779: c->io_ready = 0;
1.411 djm 2780: /* rfd, potentially shared with wfd, efd and sock */
1.415 djm 2781: if (c->rfd != -1 && (p = c->pfds[0]) != -1) {
2782: fd_ready(c, p, pfd, npfd, c->rfd,
2783: "rfd", POLLIN, SSH_CHAN_IO_RFD);
1.411 djm 2784: if (c->rfd == c->wfd) {
1.415 djm 2785: fd_ready(c, p, pfd, npfd, c->wfd,
2786: "wfd/r", POLLOUT, SSH_CHAN_IO_WFD);
1.411 djm 2787: }
2788: if (c->rfd == c->efd) {
1.415 djm 2789: fd_ready(c, p, pfd, npfd, c->efd,
2790: "efdr/r", POLLIN, SSH_CHAN_IO_EFD_R);
2791: fd_ready(c, p, pfd, npfd, c->efd,
2792: "efdw/r", POLLOUT, SSH_CHAN_IO_EFD_W);
1.411 djm 2793: }
2794: if (c->rfd == c->sock) {
1.415 djm 2795: fd_ready(c, p, pfd, npfd, c->sock,
2796: "sockr/r", POLLIN, SSH_CHAN_IO_SOCK_R);
2797: fd_ready(c, p, pfd, npfd, c->sock,
2798: "sockw/r", POLLOUT, SSH_CHAN_IO_SOCK_W);
1.411 djm 2799: }
1.415 djm 2800: dump_channel_poll(__func__, "rfd", c, p, pfd);
1.411 djm 2801: }
2802: /* wfd */
1.415 djm 2803: if (c->wfd != -1 && c->wfd != c->rfd &&
2804: (p = c->pfds[1]) != -1) {
2805: fd_ready(c, p, pfd, npfd, c->wfd,
2806: "wfd", POLLOUT, SSH_CHAN_IO_WFD);
2807: dump_channel_poll(__func__, "wfd", c, p, pfd);
1.411 djm 2808: }
2809: /* efd */
1.415 djm 2810: if (c->efd != -1 && c->efd != c->rfd &&
2811: (p = c->pfds[2]) != -1) {
2812: fd_ready(c, p, pfd, npfd, c->efd,
2813: "efdr", POLLIN, SSH_CHAN_IO_EFD_R);
2814: fd_ready(c, p, pfd, npfd, c->efd,
2815: "efdw", POLLOUT, SSH_CHAN_IO_EFD_W);
2816: dump_channel_poll(__func__, "efd", c, p, pfd);
1.411 djm 2817: }
2818: /* sock */
1.415 djm 2819: if (c->sock != -1 && c->sock != c->rfd &&
2820: (p = c->pfds[3]) != -1) {
2821: fd_ready(c, p, pfd, npfd, c->sock,
2822: "sockr", POLLIN, SSH_CHAN_IO_SOCK_R);
2823: fd_ready(c, p, pfd, npfd, c->sock,
2824: "sockw", POLLOUT, SSH_CHAN_IO_SOCK_W);
2825: dump_channel_poll(__func__, "sock", c, p, pfd);
1.411 djm 2826: }
1.410 djm 2827: }
2828: channel_handler(ssh, CHAN_POST, NULL);
1.367 djm 2829: }
2830:
2831: /*
2832: * Enqueue data for channels with open or draining c->input.
2833: */
2834: static void
2835: channel_output_poll_input_open(struct ssh *ssh, Channel *c)
2836: {
1.373 djm 2837: size_t len, plen;
2838: const u_char *pkt;
1.367 djm 2839: int r;
2840:
2841: if ((len = sshbuf_len(c->input)) == 0) {
2842: if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
2843: /*
2844: * input-buffer is empty and read-socket shutdown:
2845: * tell peer, that we will not send more data:
2846: * send IEOF.
2847: * hack for extended data: delay EOF if EFD still
2848: * in use.
2849: */
2850: if (CHANNEL_EFD_INPUT_ACTIVE(c))
2851: debug2("channel %d: "
2852: "ibuf_empty delayed efd %d/(%zu)",
2853: c->self, c->efd, sshbuf_len(c->extended));
2854: else
2855: chan_ibuf_empty(ssh, c);
2856: }
2857: return;
2858: }
2859:
1.368 djm 2860: if (!c->have_remote_id)
1.403 djm 2861: fatal_f("channel %d: no remote id", c->self);
1.368 djm 2862:
1.367 djm 2863: if (c->datagram) {
2864: /* Check datagram will fit; drop if not */
1.373 djm 2865: if ((r = sshbuf_get_string_direct(c->input, &pkt, &plen)) != 0)
1.403 djm 2866: fatal_fr(r, "channel %i: get datagram", c->self);
1.367 djm 2867: /*
2868: * XXX this does tail-drop on the datagram queue which is
2869: * usually suboptimal compared to head-drop. Better to have
2870: * backpressure at read time? (i.e. read + discard)
2871: */
1.373 djm 2872: if (plen > c->remote_window || plen > c->remote_maxpacket) {
1.367 djm 2873: debug("channel %d: datagram too big", c->self);
2874: return;
2875: }
2876: /* Enqueue it */
2877: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_DATA)) != 0 ||
2878: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1.373 djm 2879: (r = sshpkt_put_string(ssh, pkt, plen)) != 0 ||
1.403 djm 2880: (r = sshpkt_send(ssh)) != 0)
2881: fatal_fr(r, "channel %i: send datagram", c->self);
1.373 djm 2882: c->remote_window -= plen;
1.367 djm 2883: return;
2884: }
2885:
2886: /* Enqueue packet for buffered data. */
2887: if (len > c->remote_window)
2888: len = c->remote_window;
2889: if (len > c->remote_maxpacket)
2890: len = c->remote_maxpacket;
2891: if (len == 0)
2892: return;
2893: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_DATA)) != 0 ||
2894: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
2895: (r = sshpkt_put_string(ssh, sshbuf_ptr(c->input), len)) != 0 ||
1.403 djm 2896: (r = sshpkt_send(ssh)) != 0)
2897: fatal_fr(r, "channel %i: send data", c->self);
1.367 djm 2898: if ((r = sshbuf_consume(c->input, len)) != 0)
1.403 djm 2899: fatal_fr(r, "channel %i: consume", c->self);
1.367 djm 2900: c->remote_window -= len;
1.41 markus 2901: }
2902:
1.367 djm 2903: /*
2904: * Enqueue data for channels with open c->extended in read mode.
2905: */
2906: static void
2907: channel_output_poll_extended_read(struct ssh *ssh, Channel *c)
2908: {
2909: size_t len;
2910: int r;
2911:
2912: if ((len = sshbuf_len(c->extended)) == 0)
2913: return;
2914:
2915: debug2("channel %d: rwin %u elen %zu euse %d", c->self,
2916: c->remote_window, sshbuf_len(c->extended), c->extended_usage);
2917: if (len > c->remote_window)
2918: len = c->remote_window;
2919: if (len > c->remote_maxpacket)
2920: len = c->remote_maxpacket;
2921: if (len == 0)
2922: return;
1.368 djm 2923: if (!c->have_remote_id)
1.403 djm 2924: fatal_f("channel %d: no remote id", c->self);
1.367 djm 2925: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA)) != 0 ||
2926: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
2927: (r = sshpkt_put_u32(ssh, SSH2_EXTENDED_DATA_STDERR)) != 0 ||
2928: (r = sshpkt_put_string(ssh, sshbuf_ptr(c->extended), len)) != 0 ||
1.403 djm 2929: (r = sshpkt_send(ssh)) != 0)
2930: fatal_fr(r, "channel %i: data", c->self);
1.367 djm 2931: if ((r = sshbuf_consume(c->extended, len)) != 0)
1.403 djm 2932: fatal_fr(r, "channel %i: consume", c->self);
1.367 djm 2933: c->remote_window -= len;
2934: debug2("channel %d: sent ext data %zu", c->self, len);
2935: }
1.121 markus 2936:
1.84 markus 2937: /* If there is data to send to the connection, enqueue some of it now. */
1.49 markus 2938: void
1.367 djm 2939: channel_output_poll(struct ssh *ssh)
1.1 deraadt 2940: {
1.367 djm 2941: struct ssh_channels *sc = ssh->chanctxt;
1.41 markus 2942: Channel *c;
1.367 djm 2943: u_int i;
1.1 deraadt 2944:
1.367 djm 2945: for (i = 0; i < sc->channels_alloc; i++) {
2946: c = sc->channels[i];
1.113 markus 2947: if (c == NULL)
2948: continue;
1.37 markus 2949:
1.121 markus 2950: /*
2951: * We are only interested in channels that can have buffered
2952: * incoming data.
2953: */
1.358 djm 2954: if (c->type != SSH_CHANNEL_OPEN)
2955: continue;
2956: if ((c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
1.93 markus 2957: /* XXX is this true? */
1.367 djm 2958: debug3("channel %d: will not send data after close",
2959: c->self);
1.44 markus 2960: continue;
2961: }
1.25 markus 2962:
2963: /* Get the amount of buffered data for this channel. */
1.367 djm 2964: if (c->istate == CHAN_INPUT_OPEN ||
2965: c->istate == CHAN_INPUT_WAIT_DRAIN)
2966: channel_output_poll_input_open(ssh, c);
1.44 markus 2967: /* Send extended data, i.e. stderr */
1.358 djm 2968: if (!(c->flags & CHAN_EOF_SENT) &&
1.367 djm 2969: c->extended_usage == CHAN_EXTENDED_READ)
2970: channel_output_poll_extended_read(ssh, c);
1.25 markus 2971: }
1.1 deraadt 2972: }
2973:
1.354 markus 2974: /* -- mux proxy support */
2975:
2976: /*
2977: * When multiplexing channel messages for mux clients we have to deal
2978: * with downstream messages from the mux client and upstream messages
2979: * from the ssh server:
2980: * 1) Handling downstream messages is straightforward and happens
2981: * in channel_proxy_downstream():
2982: * - We forward all messages (mostly) unmodified to the server.
2983: * - However, in order to route messages from upstream to the correct
2984: * downstream client, we have to replace the channel IDs used by the
2985: * mux clients with a unique channel ID because the mux clients might
2986: * use conflicting channel IDs.
2987: * - so we inspect and change both SSH2_MSG_CHANNEL_OPEN and
2988: * SSH2_MSG_CHANNEL_OPEN_CONFIRMATION messages, create a local
2989: * SSH_CHANNEL_MUX_PROXY channel and replace the mux clients ID
2990: * with the newly allocated channel ID.
2991: * 2) Upstream messages are received by matching SSH_CHANNEL_MUX_PROXY
1.380 djm 2992: * channels and processed by channel_proxy_upstream(). The local channel ID
1.354 markus 2993: * is then translated back to the original mux client ID.
2994: * 3) In both cases we need to keep track of matching SSH2_MSG_CHANNEL_CLOSE
2995: * messages so we can clean up SSH_CHANNEL_MUX_PROXY channels.
2996: * 4) The SSH_CHANNEL_MUX_PROXY channels also need to closed when the
2997: * downstream mux client are removed.
2998: * 5) Handling SSH2_MSG_CHANNEL_OPEN messages from the upstream server
2999: * requires more work, because they are not addressed to a specific
3000: * channel. E.g. client_request_forwarded_tcpip() needs to figure
3001: * out whether the request is addressed to the local client or a
3002: * specific downstream client based on the listen-address/port.
1.380 djm 3003: * 6) Agent and X11-Forwarding have a similar problem and are currently
1.354 markus 3004: * not supported as the matching session/channel cannot be identified
3005: * easily.
3006: */
3007:
3008: /*
3009: * receive packets from downstream mux clients:
3010: * channel callback fired on read from mux client, creates
3011: * SSH_CHANNEL_MUX_PROXY channels and translates channel IDs
3012: * on channel creation.
3013: */
3014: int
1.367 djm 3015: channel_proxy_downstream(struct ssh *ssh, Channel *downstream)
1.354 markus 3016: {
3017: Channel *c = NULL;
3018: struct sshbuf *original = NULL, *modified = NULL;
3019: const u_char *cp;
3020: char *ctype = NULL, *listen_host = NULL;
3021: u_char type;
3022: size_t have;
1.370 djm 3023: int ret = -1, r;
1.355 djm 3024: u_int id, remote_id, listen_port;
1.354 markus 3025:
1.367 djm 3026: /* sshbuf_dump(downstream->input, stderr); */
3027: if ((r = sshbuf_get_string_direct(downstream->input, &cp, &have))
1.354 markus 3028: != 0) {
1.403 djm 3029: error_fr(r, "parse");
1.354 markus 3030: return -1;
3031: }
3032: if (have < 2) {
1.403 djm 3033: error_f("short message");
1.354 markus 3034: return -1;
3035: }
3036: type = cp[1];
3037: /* skip padlen + type */
3038: cp += 2;
3039: have -= 2;
3040: if (ssh_packet_log_type(type))
1.403 djm 3041: debug3_f("channel %u: down->up: type %u",
1.354 markus 3042: downstream->self, type);
3043:
3044: switch (type) {
3045: case SSH2_MSG_CHANNEL_OPEN:
3046: if ((original = sshbuf_from(cp, have)) == NULL ||
3047: (modified = sshbuf_new()) == NULL) {
1.403 djm 3048: error_f("alloc");
1.354 markus 3049: goto out;
3050: }
3051: if ((r = sshbuf_get_cstring(original, &ctype, NULL)) != 0 ||
3052: (r = sshbuf_get_u32(original, &id)) != 0) {
1.403 djm 3053: error_fr(r, "parse");
1.354 markus 3054: goto out;
3055: }
1.424 djm 3056: c = channel_new(ssh, "mux-proxy", SSH_CHANNEL_MUX_PROXY,
1.406 djm 3057: -1, -1, -1, 0, 0, 0, ctype, 1);
1.354 markus 3058: c->mux_ctx = downstream; /* point to mux client */
3059: c->mux_downstream_id = id; /* original downstream id */
3060: if ((r = sshbuf_put_cstring(modified, ctype)) != 0 ||
3061: (r = sshbuf_put_u32(modified, c->self)) != 0 ||
3062: (r = sshbuf_putb(modified, original)) != 0) {
1.403 djm 3063: error_fr(r, "compose");
1.367 djm 3064: channel_free(ssh, c);
1.354 markus 3065: goto out;
3066: }
3067: break;
3068: case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION:
3069: /*
3070: * Almost the same as SSH2_MSG_CHANNEL_OPEN, except then we
3071: * need to parse 'remote_id' instead of 'ctype'.
3072: */
3073: if ((original = sshbuf_from(cp, have)) == NULL ||
3074: (modified = sshbuf_new()) == NULL) {
1.403 djm 3075: error_f("alloc");
1.354 markus 3076: goto out;
3077: }
3078: if ((r = sshbuf_get_u32(original, &remote_id)) != 0 ||
3079: (r = sshbuf_get_u32(original, &id)) != 0) {
1.403 djm 3080: error_fr(r, "parse");
1.354 markus 3081: goto out;
3082: }
1.424 djm 3083: c = channel_new(ssh, "mux-proxy", SSH_CHANNEL_MUX_PROXY,
1.406 djm 3084: -1, -1, -1, 0, 0, 0, "mux-down-connect", 1);
1.354 markus 3085: c->mux_ctx = downstream; /* point to mux client */
3086: c->mux_downstream_id = id;
3087: c->remote_id = remote_id;
1.368 djm 3088: c->have_remote_id = 1;
1.354 markus 3089: if ((r = sshbuf_put_u32(modified, remote_id)) != 0 ||
3090: (r = sshbuf_put_u32(modified, c->self)) != 0 ||
3091: (r = sshbuf_putb(modified, original)) != 0) {
1.403 djm 3092: error_fr(r, "compose");
1.367 djm 3093: channel_free(ssh, c);
1.354 markus 3094: goto out;
3095: }
3096: break;
3097: case SSH2_MSG_GLOBAL_REQUEST:
3098: if ((original = sshbuf_from(cp, have)) == NULL) {
1.403 djm 3099: error_f("alloc");
1.354 markus 3100: goto out;
3101: }
3102: if ((r = sshbuf_get_cstring(original, &ctype, NULL)) != 0) {
1.403 djm 3103: error_fr(r, "parse");
1.354 markus 3104: goto out;
3105: }
3106: if (strcmp(ctype, "tcpip-forward") != 0) {
1.403 djm 3107: error_f("unsupported request %s", ctype);
1.354 markus 3108: goto out;
3109: }
3110: if ((r = sshbuf_get_u8(original, NULL)) != 0 ||
3111: (r = sshbuf_get_cstring(original, &listen_host, NULL)) != 0 ||
3112: (r = sshbuf_get_u32(original, &listen_port)) != 0) {
1.403 djm 3113: error_fr(r, "parse");
1.354 markus 3114: goto out;
3115: }
1.355 djm 3116: if (listen_port > 65535) {
1.403 djm 3117: error_f("tcpip-forward for %s: bad port %u",
3118: listen_host, listen_port);
1.355 djm 3119: goto out;
3120: }
1.354 markus 3121: /* Record that connection to this host/port is permitted. */
1.381 djm 3122: permission_set_add(ssh, FORWARD_USER, FORWARD_LOCAL, "<mux>", -1,
1.367 djm 3123: listen_host, NULL, (int)listen_port, downstream);
1.354 markus 3124: listen_host = NULL;
3125: break;
3126: case SSH2_MSG_CHANNEL_CLOSE:
3127: if (have < 4)
3128: break;
3129: remote_id = PEEK_U32(cp);
1.367 djm 3130: if ((c = channel_by_remote_id(ssh, remote_id)) != NULL) {
1.354 markus 3131: if (c->flags & CHAN_CLOSE_RCVD)
1.367 djm 3132: channel_free(ssh, c);
1.354 markus 3133: else
3134: c->flags |= CHAN_CLOSE_SENT;
3135: }
3136: break;
3137: }
3138: if (modified) {
3139: if ((r = sshpkt_start(ssh, type)) != 0 ||
3140: (r = sshpkt_putb(ssh, modified)) != 0 ||
3141: (r = sshpkt_send(ssh)) != 0) {
1.403 djm 3142: error_fr(r, "send");
1.354 markus 3143: goto out;
3144: }
3145: } else {
3146: if ((r = sshpkt_start(ssh, type)) != 0 ||
3147: (r = sshpkt_put(ssh, cp, have)) != 0 ||
3148: (r = sshpkt_send(ssh)) != 0) {
1.403 djm 3149: error_fr(r, "send");
1.354 markus 3150: goto out;
3151: }
3152: }
3153: ret = 0;
3154: out:
3155: free(ctype);
3156: free(listen_host);
3157: sshbuf_free(original);
3158: sshbuf_free(modified);
3159: return ret;
3160: }
3161:
3162: /*
3163: * receive packets from upstream server and de-multiplex packets
3164: * to correct downstream:
3165: * implemented as a helper for channel input handlers,
3166: * replaces local (proxy) channel ID with downstream channel ID.
3167: */
3168: int
1.363 markus 3169: channel_proxy_upstream(Channel *c, int type, u_int32_t seq, struct ssh *ssh)
1.354 markus 3170: {
3171: struct sshbuf *b = NULL;
3172: Channel *downstream;
3173: const u_char *cp = NULL;
3174: size_t len;
3175: int r;
3176:
3177: /*
3178: * When receiving packets from the peer we need to check whether we
3179: * need to forward the packets to the mux client. In this case we
1.380 djm 3180: * restore the original channel id and keep track of CLOSE messages,
1.354 markus 3181: * so we can cleanup the channel.
3182: */
3183: if (c == NULL || c->type != SSH_CHANNEL_MUX_PROXY)
3184: return 0;
3185: if ((downstream = c->mux_ctx) == NULL)
3186: return 0;
3187: switch (type) {
3188: case SSH2_MSG_CHANNEL_CLOSE:
3189: case SSH2_MSG_CHANNEL_DATA:
3190: case SSH2_MSG_CHANNEL_EOF:
3191: case SSH2_MSG_CHANNEL_EXTENDED_DATA:
3192: case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION:
3193: case SSH2_MSG_CHANNEL_OPEN_FAILURE:
3194: case SSH2_MSG_CHANNEL_WINDOW_ADJUST:
3195: case SSH2_MSG_CHANNEL_SUCCESS:
3196: case SSH2_MSG_CHANNEL_FAILURE:
3197: case SSH2_MSG_CHANNEL_REQUEST:
3198: break;
3199: default:
1.403 djm 3200: debug2_f("channel %u: unsupported type %u", c->self, type);
1.354 markus 3201: return 0;
3202: }
3203: if ((b = sshbuf_new()) == NULL) {
1.403 djm 3204: error_f("alloc reply");
1.354 markus 3205: goto out;
3206: }
3207: /* get remaining payload (after id) */
3208: cp = sshpkt_ptr(ssh, &len);
3209: if (cp == NULL) {
1.403 djm 3210: error_f("no packet");
1.354 markus 3211: goto out;
3212: }
3213: /* translate id and send to muxclient */
3214: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
3215: (r = sshbuf_put_u8(b, type)) != 0 ||
3216: (r = sshbuf_put_u32(b, c->mux_downstream_id)) != 0 ||
3217: (r = sshbuf_put(b, cp, len)) != 0 ||
1.367 djm 3218: (r = sshbuf_put_stringb(downstream->output, b)) != 0) {
1.403 djm 3219: error_fr(r, "compose muxclient");
1.354 markus 3220: goto out;
3221: }
3222: /* sshbuf_dump(b, stderr); */
3223: if (ssh_packet_log_type(type))
1.403 djm 3224: debug3_f("channel %u: up->down: type %u", c->self, type);
1.354 markus 3225: out:
3226: /* update state */
3227: switch (type) {
3228: case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION:
3229: /* record remote_id for SSH2_MSG_CHANNEL_CLOSE */
1.368 djm 3230: if (cp && len > 4) {
1.354 markus 3231: c->remote_id = PEEK_U32(cp);
1.368 djm 3232: c->have_remote_id = 1;
3233: }
1.354 markus 3234: break;
3235: case SSH2_MSG_CHANNEL_CLOSE:
3236: if (c->flags & CHAN_CLOSE_SENT)
1.367 djm 3237: channel_free(ssh, c);
1.354 markus 3238: else
3239: c->flags |= CHAN_CLOSE_RCVD;
3240: break;
3241: }
3242: sshbuf_free(b);
3243: return 1;
3244: }
1.121 markus 3245:
3246: /* -- protocol input */
1.249 djm 3247:
1.367 djm 3248: /* Parse a channel ID from the current packet */
3249: static int
3250: channel_parse_id(struct ssh *ssh, const char *where, const char *what)
3251: {
3252: u_int32_t id;
3253: int r;
3254:
3255: if ((r = sshpkt_get_u32(ssh, &id)) != 0) {
1.403 djm 3256: error_r(r, "%s: parse id", where);
1.367 djm 3257: ssh_packet_disconnect(ssh, "Invalid %s message", what);
3258: }
3259: if (id > INT_MAX) {
1.403 djm 3260: error_r(r, "%s: bad channel id %u", where, id);
1.367 djm 3261: ssh_packet_disconnect(ssh, "Invalid %s channel id", what);
3262: }
3263: return (int)id;
3264: }
3265:
3266: /* Lookup a channel from an ID in the current packet */
3267: static Channel *
3268: channel_from_packet_id(struct ssh *ssh, const char *where, const char *what)
3269: {
3270: int id = channel_parse_id(ssh, where, what);
3271: Channel *c;
3272:
3273: if ((c = channel_lookup(ssh, id)) == NULL) {
3274: ssh_packet_disconnect(ssh,
3275: "%s packet referred to nonexistent channel %d", what, id);
3276: }
3277: return c;
3278: }
3279:
1.339 markus 3280: int
1.363 markus 3281: channel_input_data(int type, u_int32_t seq, struct ssh *ssh)
1.1 deraadt 3282: {
1.332 djm 3283: const u_char *data;
1.367 djm 3284: size_t data_len, win_len;
3285: Channel *c = channel_from_packet_id(ssh, __func__, "data");
3286: int r;
1.25 markus 3287:
1.363 markus 3288: if (channel_proxy_upstream(c, type, seq, ssh))
1.354 markus 3289: return 0;
1.25 markus 3290:
3291: /* Ignore any data for non-open channels (might happen on close) */
1.41 markus 3292: if (c->type != SSH_CHANNEL_OPEN &&
1.372 markus 3293: c->type != SSH_CHANNEL_RDYNAMIC_OPEN &&
3294: c->type != SSH_CHANNEL_RDYNAMIC_FINISH &&
1.41 markus 3295: c->type != SSH_CHANNEL_X11_OPEN)
1.339 markus 3296: return 0;
1.37 markus 3297:
1.25 markus 3298: /* Get the data. */
1.389 djm 3299: if ((r = sshpkt_get_string_direct(ssh, &data, &data_len)) != 0 ||
3300: (r = sshpkt_get_end(ssh)) != 0)
1.403 djm 3301: fatal_fr(r, "channel %i: get data", c->self);
1.367 djm 3302:
1.309 djm 3303: win_len = data_len;
3304: if (c->datagram)
3305: win_len += 4; /* string length header */
1.200 markus 3306:
3307: /*
1.367 djm 3308: * The sending side reduces its window as it sends data, so we
3309: * must 'fake' consumption of the data in order to ensure that window
3310: * updates are sent back. Otherwise the connection might deadlock.
1.200 markus 3311: */
1.358 djm 3312: if (c->ostate != CHAN_OUTPUT_OPEN) {
3313: c->local_window -= win_len;
3314: c->local_consumed += win_len;
1.339 markus 3315: return 0;
1.200 markus 3316: }
1.41 markus 3317:
1.358 djm 3318: if (win_len > c->local_maxpacket) {
1.367 djm 3319: logit("channel %d: rcvd big packet %zu, maxpack %u",
1.358 djm 3320: c->self, win_len, c->local_maxpacket);
1.367 djm 3321: return 0;
1.358 djm 3322: }
3323: if (win_len > c->local_window) {
1.367 djm 3324: logit("channel %d: rcvd too much data %zu, win %u",
1.358 djm 3325: c->self, win_len, c->local_window);
3326: return 0;
1.44 markus 3327: }
1.358 djm 3328: c->local_window -= win_len;
3329:
1.367 djm 3330: if (c->datagram) {
3331: if ((r = sshbuf_put_string(c->output, data, data_len)) != 0)
1.403 djm 3332: fatal_fr(r, "channel %i: append datagram", c->self);
1.367 djm 3333: } else if ((r = sshbuf_put(c->output, data, data_len)) != 0)
1.403 djm 3334: fatal_fr(r, "channel %i: append data", c->self);
1.367 djm 3335:
1.339 markus 3336: return 0;
1.1 deraadt 3337: }
1.121 markus 3338:
1.339 markus 3339: int
1.363 markus 3340: channel_input_extended_data(int type, u_int32_t seq, struct ssh *ssh)
1.44 markus 3341: {
1.367 djm 3342: const u_char *data;
3343: size_t data_len;
3344: u_int32_t tcode;
3345: Channel *c = channel_from_packet_id(ssh, __func__, "extended data");
3346: int r;
1.44 markus 3347:
1.363 markus 3348: if (channel_proxy_upstream(c, type, seq, ssh))
1.354 markus 3349: return 0;
1.44 markus 3350: if (c->type != SSH_CHANNEL_OPEN) {
1.367 djm 3351: logit("channel %d: ext data for non open", c->self);
1.339 markus 3352: return 0;
1.172 markus 3353: }
3354: if (c->flags & CHAN_EOF_RCVD) {
1.404 djm 3355: if (ssh->compat & SSH_BUG_EXTEOF)
1.367 djm 3356: debug("channel %d: accepting ext data after eof",
3357: c->self);
1.172 markus 3358: else
1.367 djm 3359: ssh_packet_disconnect(ssh, "Received extended_data "
3360: "after EOF on channel %d.", c->self);
3361: }
3362:
3363: if ((r = sshpkt_get_u32(ssh, &tcode)) != 0) {
1.403 djm 3364: error_fr(r, "parse tcode");
1.367 djm 3365: ssh_packet_disconnect(ssh, "Invalid extended_data message");
1.44 markus 3366: }
3367: if (c->efd == -1 ||
3368: c->extended_usage != CHAN_EXTENDED_WRITE ||
3369: tcode != SSH2_EXTENDED_DATA_STDERR) {
1.188 itojun 3370: logit("channel %d: bad ext data", c->self);
1.339 markus 3371: return 0;
1.44 markus 3372: }
1.389 djm 3373: if ((r = sshpkt_get_string_direct(ssh, &data, &data_len)) != 0 ||
3374: (r = sshpkt_get_end(ssh)) != 0) {
1.403 djm 3375: error_fr(r, "parse data");
1.367 djm 3376: ssh_packet_disconnect(ssh, "Invalid extended_data message");
3377: }
3378:
1.44 markus 3379: if (data_len > c->local_window) {
1.367 djm 3380: logit("channel %d: rcvd too much extended_data %zu, win %u",
1.44 markus 3381: c->self, data_len, c->local_window);
1.339 markus 3382: return 0;
1.44 markus 3383: }
1.367 djm 3384: debug2("channel %d: rcvd ext data %zu", c->self, data_len);
3385: /* XXX sshpkt_getb? */
3386: if ((r = sshbuf_put(c->extended, data, data_len)) != 0)
1.403 djm 3387: error_fr(r, "append");
1.44 markus 3388: c->local_window -= data_len;
1.339 markus 3389: return 0;
1.44 markus 3390: }
3391:
1.339 markus 3392: int
1.363 markus 3393: channel_input_ieof(int type, u_int32_t seq, struct ssh *ssh)
1.41 markus 3394: {
1.367 djm 3395: Channel *c = channel_from_packet_id(ssh, __func__, "ieof");
1.389 djm 3396: int r;
1.367 djm 3397:
1.389 djm 3398: if ((r = sshpkt_get_end(ssh)) != 0) {
1.403 djm 3399: error_fr(r, "parse data");
1.389 djm 3400: ssh_packet_disconnect(ssh, "Invalid ieof message");
3401: }
1.41 markus 3402:
1.363 markus 3403: if (channel_proxy_upstream(c, type, seq, ssh))
1.354 markus 3404: return 0;
1.367 djm 3405: chan_rcvd_ieof(ssh, c);
1.133 markus 3406:
3407: /* XXX force input close */
1.156 markus 3408: if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
1.133 markus 3409: debug("channel %d: FORCE input drain", c->self);
3410: c->istate = CHAN_INPUT_WAIT_DRAIN;
1.367 djm 3411: if (sshbuf_len(c->input) == 0)
3412: chan_ibuf_empty(ssh, c);
1.133 markus 3413: }
1.339 markus 3414: return 0;
1.41 markus 3415: }
1.1 deraadt 3416:
1.339 markus 3417: int
1.363 markus 3418: channel_input_oclose(int type, u_int32_t seq, struct ssh *ssh)
1.41 markus 3419: {
1.367 djm 3420: Channel *c = channel_from_packet_id(ssh, __func__, "oclose");
1.389 djm 3421: int r;
1.151 markus 3422:
1.363 markus 3423: if (channel_proxy_upstream(c, type, seq, ssh))
1.354 markus 3424: return 0;
1.389 djm 3425: if ((r = sshpkt_get_end(ssh)) != 0) {
1.403 djm 3426: error_fr(r, "parse data");
1.389 djm 3427: ssh_packet_disconnect(ssh, "Invalid oclose message");
3428: }
1.367 djm 3429: chan_rcvd_oclose(ssh, c);
1.339 markus 3430: return 0;
1.1 deraadt 3431: }
3432:
1.339 markus 3433: int
1.363 markus 3434: channel_input_open_confirmation(int type, u_int32_t seq, struct ssh *ssh)
1.1 deraadt 3435: {
1.367 djm 3436: Channel *c = channel_from_packet_id(ssh, __func__, "open confirmation");
3437: u_int32_t remote_window, remote_maxpacket;
3438: int r;
1.25 markus 3439:
1.363 markus 3440: if (channel_proxy_upstream(c, type, seq, ssh))
1.354 markus 3441: return 0;
3442: if (c->type != SSH_CHANNEL_OPENING)
1.389 djm 3443: ssh_packet_disconnect(ssh, "Received open confirmation for "
1.367 djm 3444: "non-opening channel %d.", c->self);
3445: /*
3446: * Record the remote channel number and mark that the channel
3447: * is now open.
3448: */
1.368 djm 3449: if ((r = sshpkt_get_u32(ssh, &c->remote_id)) != 0 ||
3450: (r = sshpkt_get_u32(ssh, &remote_window)) != 0 ||
1.389 djm 3451: (r = sshpkt_get_u32(ssh, &remote_maxpacket)) != 0 ||
3452: (r = sshpkt_get_end(ssh)) != 0) {
1.403 djm 3453: error_fr(r, "window/maxpacket");
1.389 djm 3454: ssh_packet_disconnect(ssh, "Invalid open confirmation message");
1.367 djm 3455: }
3456:
1.368 djm 3457: c->have_remote_id = 1;
1.367 djm 3458: c->remote_window = remote_window;
3459: c->remote_maxpacket = remote_maxpacket;
1.41 markus 3460: c->type = SSH_CHANNEL_OPEN;
1.358 djm 3461: if (c->open_confirm) {
1.403 djm 3462: debug2_f("channel %d: callback start", c->self);
1.367 djm 3463: c->open_confirm(ssh, c->self, 1, c->open_confirm_ctx);
1.403 djm 3464: debug2_f("channel %d: callback done", c->self);
1.44 markus 3465: }
1.426 ! djm 3466: c->lastused = monotime();
1.358 djm 3467: debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
3468: c->remote_window, c->remote_maxpacket);
1.339 markus 3469: return 0;
1.1 deraadt 3470: }
3471:
1.127 itojun 3472: static char *
1.114 markus 3473: reason2txt(int reason)
3474: {
1.143 deraadt 3475: switch (reason) {
1.114 markus 3476: case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
3477: return "administratively prohibited";
3478: case SSH2_OPEN_CONNECT_FAILED:
3479: return "connect failed";
3480: case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
3481: return "unknown channel type";
3482: case SSH2_OPEN_RESOURCE_SHORTAGE:
3483: return "resource shortage";
3484: }
1.117 stevesk 3485: return "unknown reason";
1.114 markus 3486: }
3487:
1.339 markus 3488: int
1.363 markus 3489: channel_input_open_failure(int type, u_int32_t seq, struct ssh *ssh)
1.1 deraadt 3490: {
1.367 djm 3491: Channel *c = channel_from_packet_id(ssh, __func__, "open failure");
3492: u_int32_t reason;
3493: char *msg = NULL;
3494: int r;
1.25 markus 3495:
1.363 markus 3496: if (channel_proxy_upstream(c, type, seq, ssh))
1.354 markus 3497: return 0;
3498: if (c->type != SSH_CHANNEL_OPENING)
1.389 djm 3499: ssh_packet_disconnect(ssh, "Received open failure for "
1.367 djm 3500: "non-opening channel %d.", c->self);
3501: if ((r = sshpkt_get_u32(ssh, &reason)) != 0) {
1.403 djm 3502: error_fr(r, "parse reason");
1.389 djm 3503: ssh_packet_disconnect(ssh, "Invalid open failure message");
1.367 djm 3504: }
1.378 djm 3505: /* skip language */
3506: if ((r = sshpkt_get_cstring(ssh, &msg, NULL)) != 0 ||
1.389 djm 3507: (r = sshpkt_get_string_direct(ssh, NULL, NULL)) != 0 ||
3508: (r = sshpkt_get_end(ssh)) != 0) {
1.403 djm 3509: error_fr(r, "parse msg/lang");
1.389 djm 3510: ssh_packet_disconnect(ssh, "Invalid open failure message");
1.358 djm 3511: }
1.367 djm 3512: logit("channel %d: open failed: %s%s%s", c->self,
1.358 djm 3513: reason2txt(reason), msg ? ": ": "", msg ? msg : "");
3514: free(msg);
3515: if (c->open_confirm) {
1.403 djm 3516: debug2_f("channel %d: callback start", c->self);
1.367 djm 3517: c->open_confirm(ssh, c->self, 0, c->open_confirm_ctx);
1.403 djm 3518: debug2_f("channel %d: callback done", c->self);
1.44 markus 3519: }
1.291 djm 3520: /* Schedule the channel for cleanup/deletion. */
1.367 djm 3521: chan_mark_dead(ssh, c);
1.339 markus 3522: return 0;
1.44 markus 3523: }
3524:
1.339 markus 3525: int
1.363 markus 3526: channel_input_window_adjust(int type, u_int32_t seq, struct ssh *ssh)
1.121 markus 3527: {
1.367 djm 3528: int id = channel_parse_id(ssh, __func__, "window adjust");
1.121 markus 3529: Channel *c;
1.367 djm 3530: u_int32_t adjust;
3531: u_int new_rwin;
3532: int r;
1.1 deraadt 3533:
1.367 djm 3534: if ((c = channel_lookup(ssh, id)) == NULL) {
1.229 markus 3535: logit("Received window adjust for non-open channel %d.", id);
1.339 markus 3536: return 0;
1.372 markus 3537: }
1.367 djm 3538:
1.363 markus 3539: if (channel_proxy_upstream(c, type, seq, ssh))
1.354 markus 3540: return 0;
1.389 djm 3541: if ((r = sshpkt_get_u32(ssh, &adjust)) != 0 ||
3542: (r = sshpkt_get_end(ssh)) != 0) {
1.403 djm 3543: error_fr(r, "parse adjust");
1.389 djm 3544: ssh_packet_disconnect(ssh, "Invalid window adjust message");
1.367 djm 3545: }
3546: debug2("channel %d: rcvd adjust %u", c->self, adjust);
3547: if ((new_rwin = c->remote_window + adjust) < c->remote_window) {
1.346 djm 3548: fatal("channel %d: adjust %u overflows remote window %u",
1.367 djm 3549: c->self, adjust, c->remote_window);
3550: }
3551: c->remote_window = new_rwin;
1.339 markus 3552: return 0;
1.121 markus 3553: }
1.1 deraadt 3554:
1.339 markus 3555: int
1.363 markus 3556: channel_input_status_confirm(int type, u_int32_t seq, struct ssh *ssh)
1.275 djm 3557: {
1.367 djm 3558: int id = channel_parse_id(ssh, __func__, "status confirm");
1.275 djm 3559: Channel *c;
3560: struct channel_confirm *cc;
3561:
3562: /* Reset keepalive timeout */
1.389 djm 3563: ssh_packet_set_alive_timeouts(ssh, 0);
1.275 djm 3564:
1.403 djm 3565: debug2_f("type %d id %d", type, id);
1.275 djm 3566:
1.367 djm 3567: if ((c = channel_lookup(ssh, id)) == NULL) {
1.403 djm 3568: logit_f("%d: unknown", id);
1.339 markus 3569: return 0;
1.367 djm 3570: }
1.363 markus 3571: if (channel_proxy_upstream(c, type, seq, ssh))
1.354 markus 3572: return 0;
1.394 dtucker 3573: if (sshpkt_get_end(ssh) != 0)
1.389 djm 3574: ssh_packet_disconnect(ssh, "Invalid status confirm message");
1.275 djm 3575: if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL)
1.339 markus 3576: return 0;
1.367 djm 3577: cc->cb(ssh, type, c, cc->ctx);
1.275 djm 3578: TAILQ_REMOVE(&c->status_confirms, cc, entry);
1.396 jsg 3579: freezero(cc, sizeof(*cc));
1.339 markus 3580: return 0;
1.275 djm 3581: }
1.121 markus 3582:
3583: /* -- tcp forwarding */
1.135 markus 3584:
3585: void
1.367 djm 3586: channel_set_af(struct ssh *ssh, int af)
1.135 markus 3587: {
1.367 djm 3588: ssh->chanctxt->IPv4or6 = af;
1.135 markus 3589: }
1.121 markus 3590:
1.312 djm 3591:
3592: /*
3593: * Determine whether or not a port forward listens to loopback, the
3594: * specified address or wildcard. On the client, a specified bind
3595: * address will always override gateway_ports. On the server, a
3596: * gateway_ports of 1 (``yes'') will override the client's specification
3597: * and force a wildcard bind, whereas a value of 2 (``clientspecified'')
3598: * will bind to whatever address the client asked for.
3599: *
3600: * Special-case listen_addrs are:
3601: *
3602: * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR
3603: * "" (empty string), "*" -> wildcard v4/v6
3604: * "localhost" -> loopback v4/v6
1.334 djm 3605: * "127.0.0.1" / "::1" -> accepted even if gateway_ports isn't set
1.312 djm 3606: */
3607: static const char *
1.389 djm 3608: channel_fwd_bind_addr(struct ssh *ssh, const char *listen_addr, int *wildcardp,
1.336 millert 3609: int is_client, struct ForwardOptions *fwd_opts)
1.312 djm 3610: {
3611: const char *addr = NULL;
3612: int wildcard = 0;
3613:
3614: if (listen_addr == NULL) {
3615: /* No address specified: default to gateway_ports setting */
1.336 millert 3616: if (fwd_opts->gateway_ports)
1.312 djm 3617: wildcard = 1;
1.336 millert 3618: } else if (fwd_opts->gateway_ports || is_client) {
1.404 djm 3619: if (((ssh->compat & SSH_OLD_FORWARD_ADDR) &&
1.312 djm 3620: strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) ||
3621: *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 ||
1.336 millert 3622: (!is_client && fwd_opts->gateway_ports == 1)) {
1.312 djm 3623: wildcard = 1;
1.326 djm 3624: /*
3625: * Notify client if they requested a specific listen
3626: * address and it was overridden.
3627: */
3628: if (*listen_addr != '\0' &&
3629: strcmp(listen_addr, "0.0.0.0") != 0 &&
3630: strcmp(listen_addr, "*") != 0) {
1.389 djm 3631: ssh_packet_send_debug(ssh,
3632: "Forwarding listen address "
1.326 djm 3633: "\"%s\" overridden by server "
3634: "GatewayPorts", listen_addr);
3635: }
1.334 djm 3636: } else if (strcmp(listen_addr, "localhost") != 0 ||
3637: strcmp(listen_addr, "127.0.0.1") == 0 ||
3638: strcmp(listen_addr, "::1") == 0) {
1.395 djm 3639: /*
3640: * Accept explicit localhost address when
3641: * GatewayPorts=yes. The "localhost" hostname is
3642: * deliberately skipped here so it will listen on all
3643: * available local address families.
3644: */
1.334 djm 3645: addr = listen_addr;
1.326 djm 3646: }
1.334 djm 3647: } else if (strcmp(listen_addr, "127.0.0.1") == 0 ||
3648: strcmp(listen_addr, "::1") == 0) {
3649: /*
3650: * If a specific IPv4/IPv6 localhost address has been
3651: * requested then accept it even if gateway_ports is in
3652: * effect. This allows the client to prefer IPv4 or IPv6.
3653: */
3654: addr = listen_addr;
1.312 djm 3655: }
3656: if (wildcardp != NULL)
3657: *wildcardp = wildcard;
3658: return addr;
3659: }
3660:
1.160 markus 3661: static int
1.367 djm 3662: channel_setup_fwd_listener_tcpip(struct ssh *ssh, int type,
3663: struct Forward *fwd, int *allocated_listen_port,
3664: struct ForwardOptions *fwd_opts)
1.25 markus 3665: {
1.113 markus 3666: Channel *c;
1.226 djm 3667: int sock, r, success = 0, wildcard = 0, is_client;
1.35 markus 3668: struct addrinfo hints, *ai, *aitop;
1.212 djm 3669: const char *host, *addr;
1.35 markus 3670: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
1.295 djm 3671: in_port_t *lport_p;
1.25 markus 3672:
1.212 djm 3673: is_client = (type == SSH_CHANNEL_PORT_LISTENER);
1.87 markus 3674:
1.344 millert 3675: if (is_client && fwd->connect_path != NULL) {
3676: host = fwd->connect_path;
3677: } else {
3678: host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
3679: fwd->listen_host : fwd->connect_host;
3680: if (host == NULL) {
3681: error("No forward host name.");
3682: return 0;
3683: }
3684: if (strlen(host) >= NI_MAXHOST) {
3685: error("Forward host name too long.");
3686: return 0;
3687: }
1.87 markus 3688: }
1.25 markus 3689:
1.312 djm 3690: /* Determine the bind address, cf. channel_fwd_bind_addr() comment */
1.389 djm 3691: addr = channel_fwd_bind_addr(ssh, fwd->listen_host, &wildcard,
1.336 millert 3692: is_client, fwd_opts);
1.403 djm 3693: debug3_f("type %d wildcard %d addr %s", type, wildcard,
3694: (addr == NULL) ? "NULL" : addr);
1.212 djm 3695:
3696: /*
1.35 markus 3697: * getaddrinfo returns a loopback address if the hostname is
3698: * set to NULL and hints.ai_flags is not AI_PASSIVE
1.28 markus 3699: */
1.35 markus 3700: memset(&hints, 0, sizeof(hints));
1.367 djm 3701: hints.ai_family = ssh->chanctxt->IPv4or6;
1.212 djm 3702: hints.ai_flags = wildcard ? AI_PASSIVE : 0;
1.35 markus 3703: hints.ai_socktype = SOCK_STREAM;
1.336 millert 3704: snprintf(strport, sizeof strport, "%d", fwd->listen_port);
1.212 djm 3705: if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) {
3706: if (addr == NULL) {
3707: /* This really shouldn't happen */
1.389 djm 3708: ssh_packet_disconnect(ssh, "getaddrinfo: fatal error: %s",
1.271 dtucker 3709: ssh_gai_strerror(r));
1.212 djm 3710: } else {
1.403 djm 3711: error_f("getaddrinfo(%.64s): %s", addr,
1.271 dtucker 3712: ssh_gai_strerror(r));
1.212 djm 3713: }
1.218 markus 3714: return 0;
1.212 djm 3715: }
1.295 djm 3716: if (allocated_listen_port != NULL)
3717: *allocated_listen_port = 0;
1.35 markus 3718: for (ai = aitop; ai; ai = ai->ai_next) {
1.295 djm 3719: switch (ai->ai_family) {
3720: case AF_INET:
3721: lport_p = &((struct sockaddr_in *)ai->ai_addr)->
3722: sin_port;
3723: break;
3724: case AF_INET6:
3725: lport_p = &((struct sockaddr_in6 *)ai->ai_addr)->
3726: sin6_port;
3727: break;
3728: default:
1.35 markus 3729: continue;
1.295 djm 3730: }
3731: /*
3732: * If allocating a port for -R forwards, then use the
3733: * same port for all address families.
3734: */
1.367 djm 3735: if (type == SSH_CHANNEL_RPORT_LISTENER &&
3736: fwd->listen_port == 0 && allocated_listen_port != NULL &&
3737: *allocated_listen_port > 0)
1.295 djm 3738: *lport_p = htons(*allocated_listen_port);
3739:
1.35 markus 3740: if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
1.367 djm 3741: strport, sizeof(strport),
3742: NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1.403 djm 3743: error_f("getnameinfo failed");
1.35 markus 3744: continue;
3745: }
3746: /* Create a port to listen for the host. */
1.300 dtucker 3747: sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.393 deraadt 3748: if (sock == -1) {
1.35 markus 3749: /* this is no error since kernel may not support ipv6 */
1.377 djm 3750: verbose("socket [%s]:%s: %.100s", ntop, strport,
3751: strerror(errno));
1.35 markus 3752: continue;
3753: }
1.226 djm 3754:
1.376 djm 3755: set_reuseaddr(sock);
1.182 stevesk 3756:
1.295 djm 3757: debug("Local forwarding listening on %s port %s.",
3758: ntop, strport);
1.35 markus 3759:
3760: /* Bind the socket to the address. */
1.393 deraadt 3761: if (bind(sock, ai->ai_addr, ai->ai_addrlen) == -1) {
1.367 djm 3762: /*
3763: * address can be in if use ipv6 address is
3764: * already bound
3765: */
1.377 djm 3766: verbose("bind [%s]:%s: %.100s",
3767: ntop, strport, strerror(errno));
1.35 markus 3768: close(sock);
3769: continue;
3770: }
3771: /* Start listening for connections on the socket. */
1.393 deraadt 3772: if (listen(sock, SSH_LISTEN_BACKLOG) == -1) {
1.377 djm 3773: error("listen [%s]:%s: %.100s", ntop, strport,
3774: strerror(errno));
1.35 markus 3775: close(sock);
3776: continue;
3777: }
1.295 djm 3778:
3779: /*
1.336 millert 3780: * fwd->listen_port == 0 requests a dynamically allocated port -
1.295 djm 3781: * record what we got.
3782: */
1.367 djm 3783: if (type == SSH_CHANNEL_RPORT_LISTENER &&
3784: fwd->listen_port == 0 &&
1.295 djm 3785: allocated_listen_port != NULL &&
3786: *allocated_listen_port == 0) {
1.350 djm 3787: *allocated_listen_port = get_local_port(sock);
1.295 djm 3788: debug("Allocated listen port %d",
3789: *allocated_listen_port);
3790: }
3791:
1.35 markus 3792: /* Allocate a channel number for the socket. */
1.424 djm 3793: c = channel_new(ssh, "port-listener", type, sock, sock, -1,
1.51 markus 3794: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1.190 markus 3795: 0, "port listener", 1);
1.293 djm 3796: c->path = xstrdup(host);
1.336 millert 3797: c->host_port = fwd->connect_port;
1.312 djm 3798: c->listening_addr = addr == NULL ? NULL : xstrdup(addr);
1.336 millert 3799: if (fwd->listen_port == 0 && allocated_listen_port != NULL &&
1.404 djm 3800: !(ssh->compat & SSH_BUG_DYNAMIC_RPORT))
1.315 markus 3801: c->listening_port = *allocated_listen_port;
3802: else
1.336 millert 3803: c->listening_port = fwd->listen_port;
1.35 markus 3804: success = 1;
3805: }
3806: if (success == 0)
1.403 djm 3807: error_f("cannot listen to port: %d", fwd->listen_port);
1.35 markus 3808: freeaddrinfo(aitop);
1.87 markus 3809: return success;
1.25 markus 3810: }
1.1 deraadt 3811:
1.336 millert 3812: static int
1.367 djm 3813: channel_setup_fwd_listener_streamlocal(struct ssh *ssh, int type,
3814: struct Forward *fwd, struct ForwardOptions *fwd_opts)
1.336 millert 3815: {
3816: struct sockaddr_un sunaddr;
3817: const char *path;
3818: Channel *c;
3819: int port, sock;
3820: mode_t omask;
3821:
3822: switch (type) {
3823: case SSH_CHANNEL_UNIX_LISTENER:
3824: if (fwd->connect_path != NULL) {
3825: if (strlen(fwd->connect_path) > sizeof(sunaddr.sun_path)) {
3826: error("Local connecting path too long: %s",
3827: fwd->connect_path);
3828: return 0;
3829: }
3830: path = fwd->connect_path;
3831: port = PORT_STREAMLOCAL;
3832: } else {
3833: if (fwd->connect_host == NULL) {
3834: error("No forward host name.");
3835: return 0;
3836: }
3837: if (strlen(fwd->connect_host) >= NI_MAXHOST) {
3838: error("Forward host name too long.");
3839: return 0;
3840: }
3841: path = fwd->connect_host;
3842: port = fwd->connect_port;
3843: }
3844: break;
3845: case SSH_CHANNEL_RUNIX_LISTENER:
3846: path = fwd->listen_path;
3847: port = PORT_STREAMLOCAL;
3848: break;
3849: default:
1.403 djm 3850: error_f("unexpected channel type %d", type);
1.336 millert 3851: return 0;
3852: }
3853:
3854: if (fwd->listen_path == NULL) {
3855: error("No forward path name.");
3856: return 0;
3857: }
3858: if (strlen(fwd->listen_path) > sizeof(sunaddr.sun_path)) {
3859: error("Local listening path too long: %s", fwd->listen_path);
3860: return 0;
3861: }
3862:
1.403 djm 3863: debug3_f("type %d path %s", type, fwd->listen_path);
1.336 millert 3864:
3865: /* Start a Unix domain listener. */
3866: omask = umask(fwd_opts->streamlocal_bind_mask);
3867: sock = unix_listener(fwd->listen_path, SSH_LISTEN_BACKLOG,
3868: fwd_opts->streamlocal_bind_unlink);
3869: umask(omask);
3870: if (sock < 0)
3871: return 0;
3872:
3873: debug("Local forwarding listening on path %s.", fwd->listen_path);
3874:
3875: /* Allocate a channel number for the socket. */
1.424 djm 3876: c = channel_new(ssh, "unix-listener", type, sock, sock, -1,
1.336 millert 3877: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
3878: 0, "unix listener", 1);
3879: c->path = xstrdup(path);
3880: c->host_port = port;
3881: c->listening_port = PORT_STREAMLOCAL;
3882: c->listening_addr = xstrdup(fwd->listen_path);
3883: return 1;
3884: }
3885:
3886: static int
1.367 djm 3887: channel_cancel_rport_listener_tcpip(struct ssh *ssh,
3888: const char *host, u_short port)
1.202 djm 3889: {
1.209 avsm 3890: u_int i;
3891: int found = 0;
1.202 djm 3892:
1.367 djm 3893: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
3894: Channel *c = ssh->chanctxt->channels[i];
1.312 djm 3895: if (c == NULL || c->type != SSH_CHANNEL_RPORT_LISTENER)
3896: continue;
3897: if (strcmp(c->path, host) == 0 && c->listening_port == port) {
1.403 djm 3898: debug2_f("close channel %d", i);
1.367 djm 3899: channel_free(ssh, c);
1.312 djm 3900: found = 1;
3901: }
3902: }
3903:
1.367 djm 3904: return found;
1.312 djm 3905: }
3906:
1.336 millert 3907: static int
1.367 djm 3908: channel_cancel_rport_listener_streamlocal(struct ssh *ssh, const char *path)
1.336 millert 3909: {
3910: u_int i;
3911: int found = 0;
3912:
1.367 djm 3913: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
3914: Channel *c = ssh->chanctxt->channels[i];
1.336 millert 3915: if (c == NULL || c->type != SSH_CHANNEL_RUNIX_LISTENER)
3916: continue;
3917: if (c->path == NULL)
3918: continue;
3919: if (strcmp(c->path, path) == 0) {
1.403 djm 3920: debug2_f("close channel %d", i);
1.367 djm 3921: channel_free(ssh, c);
1.336 millert 3922: found = 1;
3923: }
3924: }
3925:
1.367 djm 3926: return found;
1.336 millert 3927: }
3928:
1.312 djm 3929: int
1.367 djm 3930: channel_cancel_rport_listener(struct ssh *ssh, struct Forward *fwd)
1.336 millert 3931: {
1.367 djm 3932: if (fwd->listen_path != NULL) {
3933: return channel_cancel_rport_listener_streamlocal(ssh,
3934: fwd->listen_path);
3935: } else {
3936: return channel_cancel_rport_listener_tcpip(ssh,
3937: fwd->listen_host, fwd->listen_port);
3938: }
1.336 millert 3939: }
3940:
3941: static int
1.367 djm 3942: channel_cancel_lport_listener_tcpip(struct ssh *ssh,
3943: const char *lhost, u_short lport, int cport,
3944: struct ForwardOptions *fwd_opts)
1.312 djm 3945: {
3946: u_int i;
3947: int found = 0;
1.389 djm 3948: const char *addr = channel_fwd_bind_addr(ssh, lhost, NULL, 1, fwd_opts);
1.202 djm 3949:
1.367 djm 3950: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
3951: Channel *c = ssh->chanctxt->channels[i];
1.312 djm 3952: if (c == NULL || c->type != SSH_CHANNEL_PORT_LISTENER)
3953: continue;
1.313 markus 3954: if (c->listening_port != lport)
1.312 djm 3955: continue;
1.313 markus 3956: if (cport == CHANNEL_CANCEL_PORT_STATIC) {
3957: /* skip dynamic forwardings */
3958: if (c->host_port == 0)
3959: continue;
3960: } else {
3961: if (c->host_port != cport)
3962: continue;
3963: }
1.312 djm 3964: if ((c->listening_addr == NULL && addr != NULL) ||
3965: (c->listening_addr != NULL && addr == NULL))
3966: continue;
3967: if (addr == NULL || strcmp(c->listening_addr, addr) == 0) {
1.403 djm 3968: debug2_f("close channel %d", i);
1.367 djm 3969: channel_free(ssh, c);
1.202 djm 3970: found = 1;
3971: }
3972: }
3973:
1.367 djm 3974: return found;
1.202 djm 3975: }
3976:
1.336 millert 3977: static int
1.367 djm 3978: channel_cancel_lport_listener_streamlocal(struct ssh *ssh, const char *path)
1.336 millert 3979: {
3980: u_int i;
3981: int found = 0;
3982:
3983: if (path == NULL) {
1.403 djm 3984: error_f("no path specified.");
1.336 millert 3985: return 0;
3986: }
3987:
1.367 djm 3988: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
3989: Channel *c = ssh->chanctxt->channels[i];
1.336 millert 3990: if (c == NULL || c->type != SSH_CHANNEL_UNIX_LISTENER)
3991: continue;
3992: if (c->listening_addr == NULL)
3993: continue;
3994: if (strcmp(c->listening_addr, path) == 0) {
1.403 djm 3995: debug2_f("close channel %d", i);
1.367 djm 3996: channel_free(ssh, c);
1.336 millert 3997: found = 1;
3998: }
3999: }
4000:
1.367 djm 4001: return found;
1.336 millert 4002: }
4003:
4004: int
1.367 djm 4005: channel_cancel_lport_listener(struct ssh *ssh,
4006: struct Forward *fwd, int cport, struct ForwardOptions *fwd_opts)
1.336 millert 4007: {
1.367 djm 4008: if (fwd->listen_path != NULL) {
4009: return channel_cancel_lport_listener_streamlocal(ssh,
4010: fwd->listen_path);
4011: } else {
4012: return channel_cancel_lport_listener_tcpip(ssh,
4013: fwd->listen_host, fwd->listen_port, cport, fwd_opts);
4014: }
1.336 millert 4015: }
4016:
1.362 markus 4017: /* protocol local port fwd, used by ssh */
1.160 markus 4018: int
1.367 djm 4019: channel_setup_local_fwd_listener(struct ssh *ssh,
4020: struct Forward *fwd, struct ForwardOptions *fwd_opts)
1.160 markus 4021: {
1.336 millert 4022: if (fwd->listen_path != NULL) {
1.367 djm 4023: return channel_setup_fwd_listener_streamlocal(ssh,
1.336 millert 4024: SSH_CHANNEL_UNIX_LISTENER, fwd, fwd_opts);
4025: } else {
1.367 djm 4026: return channel_setup_fwd_listener_tcpip(ssh,
4027: SSH_CHANNEL_PORT_LISTENER, fwd, NULL, fwd_opts);
1.336 millert 4028: }
1.160 markus 4029: }
4030:
1.381 djm 4031: /* Matches a remote forwarding permission against a requested forwarding */
4032: static int
4033: remote_open_match(struct permission *allowed_open, struct Forward *fwd)
4034: {
4035: int ret;
4036: char *lhost;
4037:
4038: /* XXX add ACLs for streamlocal */
4039: if (fwd->listen_path != NULL)
4040: return 1;
4041:
4042: if (fwd->listen_host == NULL || allowed_open->listen_host == NULL)
4043: return 0;
4044:
4045: if (allowed_open->listen_port != FWD_PERMIT_ANY_PORT &&
4046: allowed_open->listen_port != fwd->listen_port)
4047: return 0;
4048:
4049: /* Match hostnames case-insensitively */
4050: lhost = xstrdup(fwd->listen_host);
4051: lowercase(lhost);
4052: ret = match_pattern(lhost, allowed_open->listen_host);
4053: free(lhost);
4054:
4055: return ret;
4056: }
4057:
4058: /* Checks whether a requested remote forwarding is permitted */
4059: static int
4060: check_rfwd_permission(struct ssh *ssh, struct Forward *fwd)
4061: {
4062: struct ssh_channels *sc = ssh->chanctxt;
4063: struct permission_set *pset = &sc->remote_perms;
4064: u_int i, permit, permit_adm = 1;
4065: struct permission *perm;
4066:
4067: /* XXX apply GatewayPorts override before checking? */
4068:
4069: permit = pset->all_permitted;
4070: if (!permit) {
4071: for (i = 0; i < pset->num_permitted_user; i++) {
4072: perm = &pset->permitted_user[i];
4073: if (remote_open_match(perm, fwd)) {
4074: permit = 1;
4075: break;
4076: }
4077: }
4078: }
4079:
4080: if (pset->num_permitted_admin > 0) {
4081: permit_adm = 0;
4082: for (i = 0; i < pset->num_permitted_admin; i++) {
4083: perm = &pset->permitted_admin[i];
4084: if (remote_open_match(perm, fwd)) {
4085: permit_adm = 1;
4086: break;
4087: }
4088: }
4089: }
4090:
4091: return permit && permit_adm;
4092: }
4093:
1.160 markus 4094: /* protocol v2 remote port fwd, used by sshd */
4095: int
1.367 djm 4096: channel_setup_remote_fwd_listener(struct ssh *ssh, struct Forward *fwd,
1.336 millert 4097: int *allocated_listen_port, struct ForwardOptions *fwd_opts)
1.160 markus 4098: {
1.381 djm 4099: if (!check_rfwd_permission(ssh, fwd)) {
1.389 djm 4100: ssh_packet_send_debug(ssh, "port forwarding refused");
1.391 florian 4101: if (fwd->listen_path != NULL)
4102: /* XXX always allowed, see remote_open_match() */
4103: logit("Received request from %.100s port %d to "
4104: "remote forward to path \"%.100s\", "
4105: "but the request was denied.",
4106: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh),
4107: fwd->listen_path);
4108: else if(fwd->listen_host != NULL)
4109: logit("Received request from %.100s port %d to "
4110: "remote forward to host %.100s port %d, "
4111: "but the request was denied.",
4112: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh),
4113: fwd->listen_host, fwd->listen_port );
4114: else
4115: logit("Received request from %.100s port %d to remote "
4116: "forward, but the request was denied.",
4117: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1.381 djm 4118: return 0;
4119: }
1.336 millert 4120: if (fwd->listen_path != NULL) {
1.367 djm 4121: return channel_setup_fwd_listener_streamlocal(ssh,
1.336 millert 4122: SSH_CHANNEL_RUNIX_LISTENER, fwd, fwd_opts);
4123: } else {
1.367 djm 4124: return channel_setup_fwd_listener_tcpip(ssh,
1.336 millert 4125: SSH_CHANNEL_RPORT_LISTENER, fwd, allocated_listen_port,
4126: fwd_opts);
4127: }
1.160 markus 4128: }
4129:
1.27 markus 4130: /*
1.312 djm 4131: * Translate the requested rfwd listen host to something usable for
4132: * this server.
4133: */
4134: static const char *
4135: channel_rfwd_bind_host(const char *listen_host)
4136: {
4137: if (listen_host == NULL) {
1.378 djm 4138: return "localhost";
1.312 djm 4139: } else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) {
1.378 djm 4140: return "";
1.312 djm 4141: } else
4142: return listen_host;
4143: }
4144:
4145: /*
1.27 markus 4146: * Initiate forwarding of connections to port "port" on remote host through
4147: * the secure channel to host:port from local side.
1.315 markus 4148: * Returns handle (index) for updating the dynamic listen port with
1.381 djm 4149: * channel_update_permission().
1.27 markus 4150: */
1.253 markus 4151: int
1.367 djm 4152: channel_request_remote_forwarding(struct ssh *ssh, struct Forward *fwd)
1.25 markus 4153: {
1.367 djm 4154: int r, success = 0, idx = -1;
1.421 mbuhl 4155: const char *host_to_connect, *listen_host, *listen_path;
1.367 djm 4156: int port_to_connect, listen_port;
1.73 markus 4157:
1.25 markus 4158: /* Send the forward request to the remote side. */
1.358 djm 4159: if (fwd->listen_path != NULL) {
1.367 djm 4160: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
4161: (r = sshpkt_put_cstring(ssh,
4162: "streamlocal-forward@openssh.com")) != 0 ||
4163: (r = sshpkt_put_u8(ssh, 1)) != 0 || /* want reply */
4164: (r = sshpkt_put_cstring(ssh, fwd->listen_path)) != 0 ||
4165: (r = sshpkt_send(ssh)) != 0 ||
4166: (r = ssh_packet_write_wait(ssh)) != 0)
1.403 djm 4167: fatal_fr(r, "request streamlocal");
1.336 millert 4168: } else {
1.367 djm 4169: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
4170: (r = sshpkt_put_cstring(ssh, "tcpip-forward")) != 0 ||
4171: (r = sshpkt_put_u8(ssh, 1)) != 0 || /* want reply */
4172: (r = sshpkt_put_cstring(ssh,
4173: channel_rfwd_bind_host(fwd->listen_host))) != 0 ||
4174: (r = sshpkt_put_u32(ssh, fwd->listen_port)) != 0 ||
4175: (r = sshpkt_send(ssh)) != 0 ||
4176: (r = ssh_packet_write_wait(ssh)) != 0)
1.403 djm 4177: fatal_fr(r, "request tcpip-forward");
1.73 markus 4178: }
1.358 djm 4179: /* Assume that server accepts the request */
4180: success = 1;
1.73 markus 4181: if (success) {
1.305 djm 4182: /* Record that connection to this host/port is permitted. */
1.367 djm 4183: host_to_connect = listen_host = listen_path = NULL;
4184: port_to_connect = listen_port = 0;
1.336 millert 4185: if (fwd->connect_path != NULL) {
1.421 mbuhl 4186: host_to_connect = fwd->connect_path;
1.367 djm 4187: port_to_connect = PORT_STREAMLOCAL;
1.336 millert 4188: } else {
1.421 mbuhl 4189: host_to_connect = fwd->connect_host;
1.367 djm 4190: port_to_connect = fwd->connect_port;
1.336 millert 4191: }
4192: if (fwd->listen_path != NULL) {
1.421 mbuhl 4193: listen_path = fwd->listen_path;
1.367 djm 4194: listen_port = PORT_STREAMLOCAL;
1.336 millert 4195: } else {
1.421 mbuhl 4196: listen_host = fwd->listen_host;
1.367 djm 4197: listen_port = fwd->listen_port;
4198: }
1.381 djm 4199: idx = permission_set_add(ssh, FORWARD_USER, FORWARD_LOCAL,
1.367 djm 4200: host_to_connect, port_to_connect,
4201: listen_host, listen_path, listen_port, NULL);
1.44 markus 4202: }
1.367 djm 4203: return idx;
1.1 deraadt 4204: }
4205:
1.333 markus 4206: static int
1.381 djm 4207: open_match(struct permission *allowed_open, const char *requestedhost,
1.336 millert 4208: int requestedport)
1.333 markus 4209: {
4210: if (allowed_open->host_to_connect == NULL)
4211: return 0;
4212: if (allowed_open->port_to_connect != FWD_PERMIT_ANY_PORT &&
4213: allowed_open->port_to_connect != requestedport)
4214: return 0;
1.351 dtucker 4215: if (strcmp(allowed_open->host_to_connect, FWD_PERMIT_ANY_HOST) != 0 &&
4216: strcmp(allowed_open->host_to_connect, requestedhost) != 0)
1.333 markus 4217: return 0;
4218: return 1;
4219: }
4220:
4221: /*
1.336 millert 4222: * Note that in the listen host/port case
1.333 markus 4223: * we don't support FWD_PERMIT_ANY_PORT and
4224: * need to translate between the configured-host (listen_host)
4225: * and what we've sent to the remote server (channel_rfwd_bind_host)
4226: */
4227: static int
1.381 djm 4228: open_listen_match_tcpip(struct permission *allowed_open,
1.336 millert 4229: const char *requestedhost, u_short requestedport, int translate)
1.333 markus 4230: {
4231: const char *allowed_host;
4232:
4233: if (allowed_open->host_to_connect == NULL)
4234: return 0;
4235: if (allowed_open->listen_port != requestedport)
4236: return 0;
1.335 djm 4237: if (!translate && allowed_open->listen_host == NULL &&
4238: requestedhost == NULL)
4239: return 1;
1.333 markus 4240: allowed_host = translate ?
4241: channel_rfwd_bind_host(allowed_open->listen_host) :
4242: allowed_open->listen_host;
1.382 djm 4243: if (allowed_host == NULL || requestedhost == NULL ||
1.333 markus 4244: strcmp(allowed_host, requestedhost) != 0)
4245: return 0;
4246: return 1;
4247: }
4248:
1.336 millert 4249: static int
1.381 djm 4250: open_listen_match_streamlocal(struct permission *allowed_open,
1.336 millert 4251: const char *requestedpath)
4252: {
4253: if (allowed_open->host_to_connect == NULL)
4254: return 0;
4255: if (allowed_open->listen_port != PORT_STREAMLOCAL)
4256: return 0;
4257: if (allowed_open->listen_path == NULL ||
4258: strcmp(allowed_open->listen_path, requestedpath) != 0)
4259: return 0;
4260: return 1;
4261: }
4262:
1.27 markus 4263: /*
1.208 deraadt 4264: * Request cancellation of remote forwarding of connection host:port from
1.202 djm 4265: * local side.
4266: */
1.336 millert 4267: static int
1.367 djm 4268: channel_request_rforward_cancel_tcpip(struct ssh *ssh,
4269: const char *host, u_short port)
1.202 djm 4270: {
1.367 djm 4271: struct ssh_channels *sc = ssh->chanctxt;
1.381 djm 4272: struct permission_set *pset = &sc->local_perms;
1.367 djm 4273: int r;
4274: u_int i;
1.397 markus 4275: struct permission *perm = NULL;
1.202 djm 4276:
1.381 djm 4277: for (i = 0; i < pset->num_permitted_user; i++) {
4278: perm = &pset->permitted_user[i];
4279: if (open_listen_match_tcpip(perm, host, port, 0))
1.202 djm 4280: break;
1.381 djm 4281: perm = NULL;
1.202 djm 4282: }
1.381 djm 4283: if (perm == NULL) {
1.403 djm 4284: debug_f("requested forward not found");
1.312 djm 4285: return -1;
1.202 djm 4286: }
1.367 djm 4287: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
4288: (r = sshpkt_put_cstring(ssh, "cancel-tcpip-forward")) != 0 ||
4289: (r = sshpkt_put_u8(ssh, 0)) != 0 || /* want reply */
4290: (r = sshpkt_put_cstring(ssh, channel_rfwd_bind_host(host))) != 0 ||
4291: (r = sshpkt_put_u32(ssh, port)) != 0 ||
4292: (r = sshpkt_send(ssh)) != 0)
1.403 djm 4293: fatal_fr(r, "send cancel");
1.367 djm 4294:
1.381 djm 4295: fwd_perm_clear(perm); /* unregister */
1.336 millert 4296:
4297: return 0;
4298: }
4299:
4300: /*
4301: * Request cancellation of remote forwarding of Unix domain socket
4302: * path from local side.
4303: */
4304: static int
1.367 djm 4305: channel_request_rforward_cancel_streamlocal(struct ssh *ssh, const char *path)
1.336 millert 4306: {
1.367 djm 4307: struct ssh_channels *sc = ssh->chanctxt;
1.381 djm 4308: struct permission_set *pset = &sc->local_perms;
1.367 djm 4309: int r;
4310: u_int i;
1.397 markus 4311: struct permission *perm = NULL;
1.336 millert 4312:
1.381 djm 4313: for (i = 0; i < pset->num_permitted_user; i++) {
4314: perm = &pset->permitted_user[i];
4315: if (open_listen_match_streamlocal(perm, path))
1.336 millert 4316: break;
1.381 djm 4317: perm = NULL;
1.336 millert 4318: }
1.381 djm 4319: if (perm == NULL) {
1.403 djm 4320: debug_f("requested forward not found");
1.336 millert 4321: return -1;
4322: }
1.367 djm 4323: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
4324: (r = sshpkt_put_cstring(ssh,
4325: "cancel-streamlocal-forward@openssh.com")) != 0 ||
4326: (r = sshpkt_put_u8(ssh, 0)) != 0 || /* want reply */
4327: (r = sshpkt_put_cstring(ssh, path)) != 0 ||
4328: (r = sshpkt_send(ssh)) != 0)
1.403 djm 4329: fatal_fr(r, "send cancel");
1.367 djm 4330:
1.381 djm 4331: fwd_perm_clear(perm); /* unregister */
1.312 djm 4332:
4333: return 0;
1.202 djm 4334: }
4335:
4336: /*
1.336 millert 4337: * Request cancellation of remote forwarding of a connection from local side.
4338: */
4339: int
1.367 djm 4340: channel_request_rforward_cancel(struct ssh *ssh, struct Forward *fwd)
1.336 millert 4341: {
4342: if (fwd->listen_path != NULL) {
1.367 djm 4343: return channel_request_rforward_cancel_streamlocal(ssh,
4344: fwd->listen_path);
1.336 millert 4345: } else {
1.367 djm 4346: return channel_request_rforward_cancel_tcpip(ssh,
4347: fwd->listen_host,
4348: fwd->listen_port ? fwd->listen_port : fwd->allocated_port);
1.336 millert 4349: }
1.1 deraadt 4350: }
4351:
1.99 markus 4352: /*
1.381 djm 4353: * Permits opening to any host/port if permitted_user[] is empty. This is
1.99 markus 4354: * usually called by the server, because the user could connect to any port
4355: * anyway, and the server has no way to know but to trust the client anyway.
4356: */
4357: void
1.381 djm 4358: channel_permit_all(struct ssh *ssh, int where)
4359: {
4360: struct permission_set *pset = permission_set_get(ssh, where);
4361:
4362: if (pset->num_permitted_user == 0)
4363: pset->all_permitted = 1;
4364: }
4365:
4366: /*
4367: * Permit the specified host/port for forwarding.
4368: */
4369: void
4370: channel_add_permission(struct ssh *ssh, int who, int where,
4371: char *host, int port)
4372: {
4373: int local = where == FORWARD_LOCAL;
4374: struct permission_set *pset = permission_set_get(ssh, where);
4375:
4376: debug("allow %s forwarding to host %s port %d",
4377: fwd_ident(who, where), host, port);
4378: /*
4379: * Remote forwards set listen_host/port, local forwards set
4380: * host/port_to_connect.
4381: */
4382: permission_set_add(ssh, who, where,
4383: local ? host : 0, local ? port : 0,
4384: local ? NULL : host, NULL, local ? 0 : port, NULL);
4385: pset->all_permitted = 0;
4386: }
4387:
4388: /*
4389: * Administratively disable forwarding.
4390: */
4391: void
4392: channel_disable_admin(struct ssh *ssh, int where)
1.99 markus 4393: {
1.381 djm 4394: channel_clear_permission(ssh, FORWARD_ADM, where);
4395: permission_set_add(ssh, FORWARD_ADM, where,
4396: NULL, 0, NULL, NULL, 0, NULL);
1.99 markus 4397: }
4398:
1.381 djm 4399: /*
4400: * Clear a list of permitted opens.
4401: */
1.101 markus 4402: void
1.381 djm 4403: channel_clear_permission(struct ssh *ssh, int who, int where)
1.99 markus 4404: {
1.381 djm 4405: struct permission **permp;
4406: u_int *npermp;
1.367 djm 4407:
1.381 djm 4408: permission_set_get_array(ssh, who, where, &permp, &npermp);
4409: *permp = xrecallocarray(*permp, *npermp, 0, sizeof(**permp));
4410: *npermp = 0;
1.315 markus 4411: }
4412:
4413: /*
4414: * Update the listen port for a dynamic remote forward, after
4415: * the actual 'newport' has been allocated. If 'newport' < 0 is
4416: * passed then they entry will be invalidated.
4417: */
4418: void
1.381 djm 4419: channel_update_permission(struct ssh *ssh, int idx, int newport)
1.315 markus 4420: {
1.381 djm 4421: struct permission_set *pset = &ssh->chanctxt->local_perms;
1.367 djm 4422:
1.381 djm 4423: if (idx < 0 || (u_int)idx >= pset->num_permitted_user) {
1.403 djm 4424: debug_f("index out of range: %d num_permitted_user %d",
4425: idx, pset->num_permitted_user);
1.315 markus 4426: return;
4427: }
4428: debug("%s allowed port %d for forwarding to host %s port %d",
4429: newport > 0 ? "Updating" : "Removing",
4430: newport,
1.381 djm 4431: pset->permitted_user[idx].host_to_connect,
4432: pset->permitted_user[idx].port_to_connect);
1.367 djm 4433: if (newport <= 0)
1.381 djm 4434: fwd_perm_clear(&pset->permitted_user[idx]);
1.367 djm 4435: else {
1.381 djm 4436: pset->permitted_user[idx].listen_port =
1.404 djm 4437: (ssh->compat & SSH_BUG_DYNAMIC_RPORT) ? 0 : newport;
1.315 markus 4438: }
1.99 markus 4439: }
4440:
1.314 dtucker 4441: /* returns port number, FWD_PERMIT_ANY_PORT or -1 on error */
4442: int
4443: permitopen_port(const char *p)
4444: {
4445: int port;
4446:
4447: if (strcmp(p, "*") == 0)
4448: return FWD_PERMIT_ANY_PORT;
4449: if ((port = a2port(p)) > 0)
4450: return port;
4451: return -1;
4452: }
4453:
1.276 djm 4454: /* Try to start non-blocking connect to next host in cctx list */
1.127 itojun 4455: static int
1.276 djm 4456: connect_next(struct channel_connect *cctx)
1.41 markus 4457: {
1.276 djm 4458: int sock, saved_errno;
1.336 millert 4459: struct sockaddr_un *sunaddr;
1.367 djm 4460: char ntop[NI_MAXHOST];
4461: char strport[MAXIMUM(NI_MAXSERV, sizeof(sunaddr->sun_path))];
1.41 markus 4462:
1.276 djm 4463: for (; cctx->ai; cctx->ai = cctx->ai->ai_next) {
1.336 millert 4464: switch (cctx->ai->ai_family) {
4465: case AF_UNIX:
4466: /* unix:pathname instead of host:port */
4467: sunaddr = (struct sockaddr_un *)cctx->ai->ai_addr;
4468: strlcpy(ntop, "unix", sizeof(ntop));
4469: strlcpy(strport, sunaddr->sun_path, sizeof(strport));
4470: break;
4471: case AF_INET:
4472: case AF_INET6:
4473: if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen,
4474: ntop, sizeof(ntop), strport, sizeof(strport),
4475: NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1.420 djm 4476: error_f("getnameinfo failed");
1.336 millert 4477: continue;
4478: }
4479: break;
4480: default:
1.41 markus 4481: continue;
4482: }
1.420 djm 4483: debug_f("start for host %.100s ([%.100s]:%s)",
4484: cctx->host, ntop, strport);
1.300 dtucker 4485: if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype,
4486: cctx->ai->ai_protocol)) == -1) {
1.276 djm 4487: if (cctx->ai->ai_next == NULL)
1.186 djm 4488: error("socket: %.100s", strerror(errno));
4489: else
4490: verbose("socket: %.100s", strerror(errno));
1.41 markus 4491: continue;
4492: }
1.205 djm 4493: if (set_nonblock(sock) == -1)
1.403 djm 4494: fatal_f("set_nonblock(%d)", sock);
1.276 djm 4495: if (connect(sock, cctx->ai->ai_addr,
4496: cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) {
1.420 djm 4497: debug_f("host %.100s ([%.100s]:%s): %.100s",
4498: cctx->host, ntop, strport, strerror(errno));
1.276 djm 4499: saved_errno = errno;
1.41 markus 4500: close(sock);
1.276 djm 4501: errno = saved_errno;
1.89 stevesk 4502: continue; /* fail -- try next */
1.41 markus 4503: }
1.336 millert 4504: if (cctx->ai->ai_family != AF_UNIX)
4505: set_nodelay(sock);
1.420 djm 4506: debug_f("connect host %.100s ([%.100s]:%s) in progress, fd=%d",
4507: cctx->host, ntop, strport, sock);
1.276 djm 4508: cctx->ai = cctx->ai->ai_next;
4509: return sock;
4510: }
4511: return -1;
4512: }
1.41 markus 4513:
1.276 djm 4514: static void
4515: channel_connect_ctx_free(struct channel_connect *cctx)
4516: {
1.321 djm 4517: free(cctx->host);
1.336 millert 4518: if (cctx->aitop) {
4519: if (cctx->aitop->ai_family == AF_UNIX)
4520: free(cctx->aitop);
4521: else
4522: freeaddrinfo(cctx->aitop);
4523: }
1.329 tedu 4524: memset(cctx, 0, sizeof(*cctx));
1.276 djm 4525: }
4526:
1.357 dtucker 4527: /*
1.372 markus 4528: * Return connecting socket to remote host:port or local socket path,
1.357 dtucker 4529: * passing back the failure reason if appropriate.
4530: */
1.372 markus 4531: static int
4532: connect_to_helper(struct ssh *ssh, const char *name, int port, int socktype,
4533: char *ctype, char *rname, struct channel_connect *cctx,
4534: int *reason, const char **errmsg)
1.276 djm 4535: {
4536: struct addrinfo hints;
4537: int gaierr;
4538: int sock = -1;
4539: char strport[NI_MAXSERV];
1.336 millert 4540:
4541: if (port == PORT_STREAMLOCAL) {
4542: struct sockaddr_un *sunaddr;
4543: struct addrinfo *ai;
4544:
4545: if (strlen(name) > sizeof(sunaddr->sun_path)) {
4546: error("%.100s: %.100s", name, strerror(ENAMETOOLONG));
1.372 markus 4547: return -1;
1.336 millert 4548: }
4549:
4550: /*
4551: * Fake up a struct addrinfo for AF_UNIX connections.
4552: * channel_connect_ctx_free() must check ai_family
4553: * and use free() not freeaddirinfo() for AF_UNIX.
4554: */
4555: ai = xmalloc(sizeof(*ai) + sizeof(*sunaddr));
4556: memset(ai, 0, sizeof(*ai) + sizeof(*sunaddr));
4557: ai->ai_addr = (struct sockaddr *)(ai + 1);
4558: ai->ai_addrlen = sizeof(*sunaddr);
4559: ai->ai_family = AF_UNIX;
1.372 markus 4560: ai->ai_socktype = socktype;
1.336 millert 4561: ai->ai_protocol = PF_UNSPEC;
4562: sunaddr = (struct sockaddr_un *)ai->ai_addr;
4563: sunaddr->sun_family = AF_UNIX;
4564: strlcpy(sunaddr->sun_path, name, sizeof(sunaddr->sun_path));
1.372 markus 4565: cctx->aitop = ai;
1.336 millert 4566: } else {
4567: memset(&hints, 0, sizeof(hints));
1.367 djm 4568: hints.ai_family = ssh->chanctxt->IPv4or6;
1.372 markus 4569: hints.ai_socktype = socktype;
1.336 millert 4570: snprintf(strport, sizeof strport, "%d", port);
1.372 markus 4571: if ((gaierr = getaddrinfo(name, strport, &hints, &cctx->aitop))
1.357 dtucker 4572: != 0) {
4573: if (errmsg != NULL)
4574: *errmsg = ssh_gai_strerror(gaierr);
4575: if (reason != NULL)
4576: *reason = SSH2_OPEN_CONNECT_FAILED;
1.336 millert 4577: error("connect_to %.100s: unknown host (%s)", name,
4578: ssh_gai_strerror(gaierr));
1.372 markus 4579: return -1;
1.336 millert 4580: }
1.41 markus 4581: }
1.276 djm 4582:
1.372 markus 4583: cctx->host = xstrdup(name);
4584: cctx->port = port;
4585: cctx->ai = cctx->aitop;
1.276 djm 4586:
1.372 markus 4587: if ((sock = connect_next(cctx)) == -1) {
1.276 djm 4588: error("connect to %.100s port %d failed: %s",
1.336 millert 4589: name, port, strerror(errno));
1.372 markus 4590: return -1;
4591: }
4592:
4593: return sock;
4594: }
4595:
4596: /* Return CONNECTING channel to remote host:port or local socket path */
4597: static Channel *
4598: connect_to(struct ssh *ssh, const char *host, int port,
4599: char *ctype, char *rname)
4600: {
4601: struct channel_connect cctx;
4602: Channel *c;
4603: int sock;
4604:
4605: memset(&cctx, 0, sizeof(cctx));
4606: sock = connect_to_helper(ssh, host, port, SOCK_STREAM, ctype, rname,
4607: &cctx, NULL, NULL);
4608: if (sock == -1) {
1.276 djm 4609: channel_connect_ctx_free(&cctx);
4610: return NULL;
1.41 markus 4611: }
1.367 djm 4612: c = channel_new(ssh, ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1,
1.276 djm 4613: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1);
1.372 markus 4614: c->host_port = port;
4615: c->path = xstrdup(host);
1.276 djm 4616: c->connect_ctx = cctx;
1.372 markus 4617:
1.276 djm 4618: return c;
1.41 markus 4619: }
1.99 markus 4620:
1.354 markus 4621: /*
4622: * returns either the newly connected channel or the downstream channel
4623: * that needs to deal with this connection.
4624: */
1.276 djm 4625: Channel *
1.367 djm 4626: channel_connect_by_listen_address(struct ssh *ssh, const char *listen_host,
1.333 markus 4627: u_short listen_port, char *ctype, char *rname)
1.73 markus 4628: {
1.367 djm 4629: struct ssh_channels *sc = ssh->chanctxt;
1.381 djm 4630: struct permission_set *pset = &sc->local_perms;
1.367 djm 4631: u_int i;
1.381 djm 4632: struct permission *perm;
1.99 markus 4633:
1.381 djm 4634: for (i = 0; i < pset->num_permitted_user; i++) {
4635: perm = &pset->permitted_user[i];
4636: if (open_listen_match_tcpip(perm,
4637: listen_host, listen_port, 1)) {
4638: if (perm->downstream)
4639: return perm->downstream;
4640: if (perm->port_to_connect == 0)
1.372 markus 4641: return rdynamic_connect_prepare(ssh,
4642: ctype, rname);
1.367 djm 4643: return connect_to(ssh,
1.381 djm 4644: perm->host_to_connect, perm->port_to_connect,
1.367 djm 4645: ctype, rname);
1.276 djm 4646: }
4647: }
1.74 markus 4648: error("WARNING: Server requests forwarding for unknown listen_port %d",
4649: listen_port);
1.276 djm 4650: return NULL;
1.73 markus 4651: }
4652:
1.336 millert 4653: Channel *
1.367 djm 4654: channel_connect_by_listen_path(struct ssh *ssh, const char *path,
4655: char *ctype, char *rname)
1.336 millert 4656: {
1.367 djm 4657: struct ssh_channels *sc = ssh->chanctxt;
1.381 djm 4658: struct permission_set *pset = &sc->local_perms;
1.367 djm 4659: u_int i;
1.381 djm 4660: struct permission *perm;
1.336 millert 4661:
1.381 djm 4662: for (i = 0; i < pset->num_permitted_user; i++) {
4663: perm = &pset->permitted_user[i];
4664: if (open_listen_match_streamlocal(perm, path)) {
1.367 djm 4665: return connect_to(ssh,
1.381 djm 4666: perm->host_to_connect, perm->port_to_connect,
1.367 djm 4667: ctype, rname);
1.336 millert 4668: }
4669: }
4670: error("WARNING: Server requests forwarding for unknown path %.100s",
4671: path);
4672: return NULL;
4673: }
4674:
1.99 markus 4675: /* Check if connecting to that port is permitted and connect. */
1.276 djm 4676: Channel *
1.367 djm 4677: channel_connect_to_port(struct ssh *ssh, const char *host, u_short port,
4678: char *ctype, char *rname, int *reason, const char **errmsg)
1.99 markus 4679: {
1.367 djm 4680: struct ssh_channels *sc = ssh->chanctxt;
1.381 djm 4681: struct permission_set *pset = &sc->local_perms;
1.372 markus 4682: struct channel_connect cctx;
4683: Channel *c;
1.367 djm 4684: u_int i, permit, permit_adm = 1;
1.372 markus 4685: int sock;
1.381 djm 4686: struct permission *perm;
1.99 markus 4687:
1.381 djm 4688: permit = pset->all_permitted;
1.99 markus 4689: if (!permit) {
1.381 djm 4690: for (i = 0; i < pset->num_permitted_user; i++) {
4691: perm = &pset->permitted_user[i];
4692: if (open_match(perm, host, port)) {
1.99 markus 4693: permit = 1;
1.333 markus 4694: break;
4695: }
1.367 djm 4696: }
1.257 dtucker 4697: }
1.99 markus 4698:
1.381 djm 4699: if (pset->num_permitted_admin > 0) {
1.257 dtucker 4700: permit_adm = 0;
1.381 djm 4701: for (i = 0; i < pset->num_permitted_admin; i++) {
4702: perm = &pset->permitted_admin[i];
4703: if (open_match(perm, host, port)) {
1.257 dtucker 4704: permit_adm = 1;
1.333 markus 4705: break;
4706: }
1.367 djm 4707: }
1.99 markus 4708: }
1.257 dtucker 4709:
4710: if (!permit || !permit_adm) {
1.391 florian 4711: logit("Received request from %.100s port %d to connect to "
4712: "host %.100s port %d, but the request was denied.",
4713: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), host, port);
1.357 dtucker 4714: if (reason != NULL)
4715: *reason = SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED;
1.276 djm 4716: return NULL;
1.99 markus 4717: }
1.372 markus 4718:
4719: memset(&cctx, 0, sizeof(cctx));
4720: sock = connect_to_helper(ssh, host, port, SOCK_STREAM, ctype, rname,
4721: &cctx, reason, errmsg);
4722: if (sock == -1) {
4723: channel_connect_ctx_free(&cctx);
4724: return NULL;
4725: }
4726:
4727: c = channel_new(ssh, ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1,
4728: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1);
4729: c->host_port = port;
4730: c->path = xstrdup(host);
4731: c->connect_ctx = cctx;
4732:
4733: return c;
1.336 millert 4734: }
4735:
4736: /* Check if connecting to that path is permitted and connect. */
4737: Channel *
1.367 djm 4738: channel_connect_to_path(struct ssh *ssh, const char *path,
4739: char *ctype, char *rname)
1.336 millert 4740: {
1.367 djm 4741: struct ssh_channels *sc = ssh->chanctxt;
1.381 djm 4742: struct permission_set *pset = &sc->local_perms;
1.367 djm 4743: u_int i, permit, permit_adm = 1;
1.381 djm 4744: struct permission *perm;
1.336 millert 4745:
1.381 djm 4746: permit = pset->all_permitted;
1.336 millert 4747: if (!permit) {
1.381 djm 4748: for (i = 0; i < pset->num_permitted_user; i++) {
4749: perm = &pset->permitted_user[i];
4750: if (open_match(perm, path, PORT_STREAMLOCAL)) {
1.336 millert 4751: permit = 1;
4752: break;
4753: }
1.367 djm 4754: }
1.336 millert 4755: }
4756:
1.381 djm 4757: if (pset->num_permitted_admin > 0) {
1.336 millert 4758: permit_adm = 0;
1.381 djm 4759: for (i = 0; i < pset->num_permitted_admin; i++) {
4760: perm = &pset->permitted_admin[i];
4761: if (open_match(perm, path, PORT_STREAMLOCAL)) {
1.336 millert 4762: permit_adm = 1;
4763: break;
4764: }
1.367 djm 4765: }
1.336 millert 4766: }
4767:
4768: if (!permit || !permit_adm) {
4769: logit("Received request to connect to path %.100s, "
4770: "but the request was denied.", path);
4771: return NULL;
4772: }
1.367 djm 4773: return connect_to(ssh, path, PORT_STREAMLOCAL, ctype, rname);
1.204 djm 4774: }
4775:
4776: void
1.367 djm 4777: channel_send_window_changes(struct ssh *ssh)
1.204 djm 4778: {
1.367 djm 4779: struct ssh_channels *sc = ssh->chanctxt;
4780: struct winsize ws;
4781: int r;
1.209 avsm 4782: u_int i;
1.204 djm 4783:
1.367 djm 4784: for (i = 0; i < sc->channels_alloc; i++) {
4785: if (sc->channels[i] == NULL || !sc->channels[i]->client_tty ||
4786: sc->channels[i]->type != SSH_CHANNEL_OPEN)
1.204 djm 4787: continue;
1.393 deraadt 4788: if (ioctl(sc->channels[i]->rfd, TIOCGWINSZ, &ws) == -1)
1.204 djm 4789: continue;
1.367 djm 4790: channel_request_start(ssh, i, "window-change", 0);
4791: if ((r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 ||
4792: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 ||
4793: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 ||
4794: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0 ||
4795: (r = sshpkt_send(ssh)) != 0)
1.403 djm 4796: fatal_fr(r, "channel %u; send window-change", i);
1.204 djm 4797: }
1.372 markus 4798: }
4799:
4800: /* Return RDYNAMIC_OPEN channel: channel allows SOCKS, but is not connected */
4801: static Channel *
4802: rdynamic_connect_prepare(struct ssh *ssh, char *ctype, char *rname)
4803: {
4804: Channel *c;
4805: int r;
4806:
4807: c = channel_new(ssh, ctype, SSH_CHANNEL_RDYNAMIC_OPEN, -1, -1, -1,
4808: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1);
4809: c->host_port = 0;
4810: c->path = NULL;
4811:
4812: /*
4813: * We need to open the channel before we have a FD,
4814: * so that we can get SOCKS header from peer.
4815: */
4816: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
4817: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
4818: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
4819: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1.403 djm 4820: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0)
4821: fatal_fr(r, "channel %i; confirm", c->self);
1.372 markus 4822: return c;
4823: }
4824:
4825: /* Return CONNECTING socket to remote host:port or local socket path */
4826: static int
4827: rdynamic_connect_finish(struct ssh *ssh, Channel *c)
4828: {
1.405 markus 4829: struct ssh_channels *sc = ssh->chanctxt;
4830: struct permission_set *pset = &sc->local_perms;
4831: struct permission *perm;
1.372 markus 4832: struct channel_connect cctx;
1.405 markus 4833: u_int i, permit_adm = 1;
1.372 markus 4834: int sock;
1.405 markus 4835:
4836: if (pset->num_permitted_admin > 0) {
4837: permit_adm = 0;
4838: for (i = 0; i < pset->num_permitted_admin; i++) {
4839: perm = &pset->permitted_admin[i];
4840: if (open_match(perm, c->path, c->host_port)) {
4841: permit_adm = 1;
4842: break;
4843: }
4844: }
4845: }
4846: if (!permit_adm) {
4847: debug_f("requested forward not permitted");
4848: return -1;
4849: }
1.372 markus 4850:
4851: memset(&cctx, 0, sizeof(cctx));
4852: sock = connect_to_helper(ssh, c->path, c->host_port, SOCK_STREAM, NULL,
4853: NULL, &cctx, NULL, NULL);
4854: if (sock == -1)
4855: channel_connect_ctx_free(&cctx);
4856: else {
4857: /* similar to SSH_CHANNEL_CONNECTING but we've already sent the open */
4858: c->type = SSH_CHANNEL_RDYNAMIC_FINISH;
4859: c->connect_ctx = cctx;
4860: channel_register_fds(ssh, c, sock, sock, -1, 0, 1, 0);
4861: }
4862: return sock;
1.99 markus 4863: }
4864:
1.121 markus 4865: /* -- X11 forwarding */
1.1 deraadt 4866:
1.27 markus 4867: /*
4868: * Creates an internet domain socket for listening for X11 connections.
1.176 deraadt 4869: * Returns 0 and a suitable display number for the DISPLAY variable
4870: * stored in display_numberp , or -1 if an error occurs.
1.27 markus 4871: */
1.141 stevesk 4872: int
1.367 djm 4873: x11_create_display_inet(struct ssh *ssh, int x11_display_offset,
4874: int x11_use_localhost, int single_connection,
4875: u_int *display_numberp, int **chanids)
1.1 deraadt 4876: {
1.149 markus 4877: Channel *nc = NULL;
1.31 markus 4878: int display_number, sock;
4879: u_short port;
1.35 markus 4880: struct addrinfo hints, *ai, *aitop;
4881: char strport[NI_MAXSERV];
4882: int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
1.25 markus 4883:
1.224 markus 4884: if (chanids == NULL)
4885: return -1;
4886:
1.33 markus 4887: for (display_number = x11_display_offset;
1.148 deraadt 4888: display_number < MAX_DISPLAYS;
4889: display_number++) {
1.25 markus 4890: port = 6000 + display_number;
1.35 markus 4891: memset(&hints, 0, sizeof(hints));
1.367 djm 4892: hints.ai_family = ssh->chanctxt->IPv4or6;
1.163 stevesk 4893: hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
1.35 markus 4894: hints.ai_socktype = SOCK_STREAM;
4895: snprintf(strport, sizeof strport, "%d", port);
1.367 djm 4896: if ((gaierr = getaddrinfo(NULL, strport,
4897: &hints, &aitop)) != 0) {
1.271 dtucker 4898: error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr));
1.141 stevesk 4899: return -1;
1.25 markus 4900: }
1.35 markus 4901: for (ai = aitop; ai; ai = ai->ai_next) {
1.367 djm 4902: if (ai->ai_family != AF_INET &&
4903: ai->ai_family != AF_INET6)
1.35 markus 4904: continue;
1.300 dtucker 4905: sock = socket(ai->ai_family, ai->ai_socktype,
4906: ai->ai_protocol);
1.393 deraadt 4907: if (sock == -1) {
1.35 markus 4908: error("socket: %.100s", strerror(errno));
1.203 markus 4909: freeaddrinfo(aitop);
1.141 stevesk 4910: return -1;
1.35 markus 4911: }
1.376 djm 4912: set_reuseaddr(sock);
1.393 deraadt 4913: if (bind(sock, ai->ai_addr, ai->ai_addrlen) == -1) {
1.403 djm 4914: debug2_f("bind port %d: %.100s", port,
4915: strerror(errno));
1.35 markus 4916: close(sock);
1.367 djm 4917: for (n = 0; n < num_socks; n++)
1.35 markus 4918: close(socks[n]);
4919: num_socks = 0;
4920: break;
4921: }
4922: socks[num_socks++] = sock;
4923: if (num_socks == NUM_SOCKS)
4924: break;
1.25 markus 4925: }
1.83 stevesk 4926: freeaddrinfo(aitop);
1.35 markus 4927: if (num_socks > 0)
4928: break;
1.25 markus 4929: }
4930: if (display_number >= MAX_DISPLAYS) {
4931: error("Failed to allocate internet-domain X11 display socket.");
1.141 stevesk 4932: return -1;
1.25 markus 4933: }
4934: /* Start listening for connections on the socket. */
1.35 markus 4935: for (n = 0; n < num_socks; n++) {
4936: sock = socks[n];
1.393 deraadt 4937: if (listen(sock, SSH_LISTEN_BACKLOG) == -1) {
1.35 markus 4938: error("listen: %.100s", strerror(errno));
4939: close(sock);
1.141 stevesk 4940: return -1;
1.35 markus 4941: }
1.25 markus 4942: }
1.35 markus 4943:
4944: /* Allocate a channel for each socket. */
1.242 djm 4945: *chanids = xcalloc(num_socks + 1, sizeof(**chanids));
1.35 markus 4946: for (n = 0; n < num_socks; n++) {
4947: sock = socks[n];
1.424 djm 4948: nc = channel_new(ssh, "x11-listener",
1.51 markus 4949: SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
4950: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.190 markus 4951: 0, "X11 inet listener", 1);
1.167 markus 4952: nc->single_connection = single_connection;
1.224 markus 4953: (*chanids)[n] = nc->self;
1.35 markus 4954: }
1.224 markus 4955: (*chanids)[n] = -1;
1.1 deraadt 4956:
1.141 stevesk 4957: /* Return the display number for the DISPLAY environment variable. */
1.176 deraadt 4958: *display_numberp = display_number;
1.367 djm 4959: return 0;
1.1 deraadt 4960: }
4961:
1.127 itojun 4962: static int
1.77 markus 4963: connect_local_xsocket(u_int dnr)
1.1 deraadt 4964: {
1.25 markus 4965: int sock;
4966: struct sockaddr_un addr;
4967:
1.147 stevesk 4968: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1.393 deraadt 4969: if (sock == -1)
1.147 stevesk 4970: error("socket: %.100s", strerror(errno));
4971: memset(&addr, 0, sizeof(addr));
4972: addr.sun_family = AF_UNIX;
4973: snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
1.239 deraadt 4974: if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0)
1.147 stevesk 4975: return sock;
4976: close(sock);
1.25 markus 4977: error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
4978: return -1;
1.1 deraadt 4979: }
4980:
1.51 markus 4981: int
1.367 djm 4982: x11_connect_display(struct ssh *ssh)
1.1 deraadt 4983: {
1.248 deraadt 4984: u_int display_number;
1.25 markus 4985: const char *display;
1.51 markus 4986: char buf[1024], *cp;
1.35 markus 4987: struct addrinfo hints, *ai, *aitop;
4988: char strport[NI_MAXSERV];
1.248 deraadt 4989: int gaierr, sock = 0;
1.25 markus 4990:
4991: /* Try to open a socket for the local X server. */
4992: display = getenv("DISPLAY");
4993: if (!display) {
4994: error("DISPLAY not set.");
1.51 markus 4995: return -1;
1.25 markus 4996: }
1.27 markus 4997: /*
4998: * Now we decode the value of the DISPLAY variable and make a
4999: * connection to the real X server.
5000: */
5001:
5002: /*
5003: * Check if it is a unix domain socket. Unix domain displays are in
5004: * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
5005: */
1.25 markus 5006: if (strncmp(display, "unix:", 5) == 0 ||
5007: display[0] == ':') {
5008: /* Connect to the unix domain socket. */
1.367 djm 5009: if (sscanf(strrchr(display, ':') + 1, "%u",
5010: &display_number) != 1) {
5011: error("Could not parse display number from DISPLAY: "
5012: "%.100s", display);
1.51 markus 5013: return -1;
1.25 markus 5014: }
5015: /* Create a socket. */
5016: sock = connect_local_xsocket(display_number);
5017: if (sock < 0)
1.51 markus 5018: return -1;
1.25 markus 5019:
5020: /* OK, we now have a connection to the display. */
1.51 markus 5021: return sock;
1.25 markus 5022: }
1.27 markus 5023: /*
5024: * Connect to an inet socket. The DISPLAY value is supposedly
5025: * hostname:d[.s], where hostname may also be numeric IP address.
5026: */
1.145 stevesk 5027: strlcpy(buf, display, sizeof(buf));
1.25 markus 5028: cp = strchr(buf, ':');
5029: if (!cp) {
5030: error("Could not find ':' in DISPLAY: %.100s", display);
1.51 markus 5031: return -1;
1.25 markus 5032: }
5033: *cp = 0;
1.367 djm 5034: /*
5035: * buf now contains the host name. But first we parse the
5036: * display number.
5037: */
1.248 deraadt 5038: if (sscanf(cp + 1, "%u", &display_number) != 1) {
1.25 markus 5039: error("Could not parse display number from DISPLAY: %.100s",
1.148 deraadt 5040: display);
1.51 markus 5041: return -1;
1.25 markus 5042: }
1.35 markus 5043:
5044: /* Look up the host address */
5045: memset(&hints, 0, sizeof(hints));
1.367 djm 5046: hints.ai_family = ssh->chanctxt->IPv4or6;
1.35 markus 5047: hints.ai_socktype = SOCK_STREAM;
1.248 deraadt 5048: snprintf(strport, sizeof strport, "%u", 6000 + display_number);
1.35 markus 5049: if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
1.271 dtucker 5050: error("%.100s: unknown host. (%s)", buf,
5051: ssh_gai_strerror(gaierr));
1.51 markus 5052: return -1;
1.25 markus 5053: }
1.35 markus 5054: for (ai = aitop; ai; ai = ai->ai_next) {
5055: /* Create a socket. */
1.300 dtucker 5056: sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.393 deraadt 5057: if (sock == -1) {
1.194 markus 5058: debug2("socket: %.100s", strerror(errno));
1.41 markus 5059: continue;
5060: }
5061: /* Connect it to the display. */
1.393 deraadt 5062: if (connect(sock, ai->ai_addr, ai->ai_addrlen) == -1) {
1.248 deraadt 5063: debug2("connect %.100s port %u: %.100s", buf,
1.41 markus 5064: 6000 + display_number, strerror(errno));
5065: close(sock);
5066: continue;
5067: }
5068: /* Success */
5069: break;
1.35 markus 5070: }
5071: freeaddrinfo(aitop);
5072: if (!ai) {
1.367 djm 5073: error("connect %.100s port %u: %.100s", buf,
5074: 6000 + display_number, strerror(errno));
1.51 markus 5075: return -1;
1.25 markus 5076: }
1.162 stevesk 5077: set_nodelay(sock);
1.51 markus 5078: return sock;
5079: }
5080:
5081: /*
1.27 markus 5082: * Requests forwarding of X11 connections, generates fake authentication
5083: * data, and enables authentication spoofing.
1.121 markus 5084: * This should be called in the client only.
1.27 markus 5085: */
1.49 markus 5086: void
1.367 djm 5087: x11_request_forwarding_with_spoofing(struct ssh *ssh, int client_session_id,
5088: const char *disp, const char *proto, const char *data, int want_reply)
1.1 deraadt 5089: {
1.367 djm 5090: struct ssh_channels *sc = ssh->chanctxt;
1.77 markus 5091: u_int data_len = (u_int) strlen(data) / 2;
1.219 djm 5092: u_int i, value;
1.367 djm 5093: const char *cp;
1.25 markus 5094: char *new_data;
1.367 djm 5095: int r, screen_number;
1.25 markus 5096:
1.367 djm 5097: if (sc->x11_saved_display == NULL)
5098: sc->x11_saved_display = xstrdup(disp);
5099: else if (strcmp(disp, sc->x11_saved_display) != 0) {
1.219 djm 5100: error("x11_request_forwarding_with_spoofing: different "
5101: "$DISPLAY already forwarded");
5102: return;
5103: }
5104:
1.266 djm 5105: cp = strchr(disp, ':');
1.25 markus 5106: if (cp)
5107: cp = strchr(cp, '.');
5108: if (cp)
1.245 deraadt 5109: screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL);
1.25 markus 5110: else
5111: screen_number = 0;
5112:
1.367 djm 5113: if (sc->x11_saved_proto == NULL) {
1.219 djm 5114: /* Save protocol name. */
1.367 djm 5115: sc->x11_saved_proto = xstrdup(proto);
1.353 natano 5116:
5117: /* Extract real authentication data. */
1.367 djm 5118: sc->x11_saved_data = xmalloc(data_len);
1.219 djm 5119: for (i = 0; i < data_len; i++) {
1.403 djm 5120: if (sscanf(data + 2 * i, "%2x", &value) != 1) {
1.219 djm 5121: fatal("x11_request_forwarding: bad "
5122: "authentication data: %.100s", data);
1.403 djm 5123: }
1.367 djm 5124: sc->x11_saved_data[i] = value;
1.219 djm 5125: }
1.367 djm 5126: sc->x11_saved_data_len = data_len;
1.353 natano 5127:
5128: /* Generate fake data of the same length. */
1.367 djm 5129: sc->x11_fake_data = xmalloc(data_len);
5130: arc4random_buf(sc->x11_fake_data, data_len);
5131: sc->x11_fake_data_len = data_len;
1.25 markus 5132: }
5133:
5134: /* Convert the fake data into hex. */
1.367 djm 5135: new_data = tohex(sc->x11_fake_data, data_len);
1.25 markus 5136:
5137: /* Send the request packet. */
1.367 djm 5138: channel_request_start(ssh, client_session_id, "x11-req", want_reply);
5139: if ((r = sshpkt_put_u8(ssh, 0)) != 0 || /* bool: single connection */
5140: (r = sshpkt_put_cstring(ssh, proto)) != 0 ||
5141: (r = sshpkt_put_cstring(ssh, new_data)) != 0 ||
5142: (r = sshpkt_put_u32(ssh, screen_number)) != 0 ||
5143: (r = sshpkt_send(ssh)) != 0 ||
5144: (r = ssh_packet_write_wait(ssh)) != 0)
1.403 djm 5145: fatal_fr(r, "send x11-req");
1.321 djm 5146: free(new_data);
1.1 deraadt 5147: }
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