Annotation of src/usr.bin/ssh/channels.c, Revision 1.385
1.385 ! djm 1: /* $OpenBSD: channels.c,v 1.384 2018/07/27 12:03:17 markus Exp $ */
1.1 deraadt 2: /*
1.26 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * This file contains functions for generic socket connection forwarding.
7: * There is also code for initiating connection forwarding for X11 connections,
8: * arbitrary tcp/ip connections, and the authentication agent connection.
1.49 markus 9: *
1.67 deraadt 10: * As far as I am concerned, the code I have written for this software
11: * can be used freely for any purpose. Any derived versions of this
12: * software must be clearly marked as such, and if the derived work is
13: * incompatible with the protocol description in the RFC file, it must be
14: * called by a name other than "ssh" or "Secure Shell".
15: *
1.44 markus 16: * SSH2 support added by Markus Friedl.
1.156 markus 17: * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
1.67 deraadt 18: * Copyright (c) 1999 Dug Song. All rights reserved.
19: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
20: *
21: * Redistribution and use in source and binary forms, with or without
22: * modification, are permitted provided that the following conditions
23: * are met:
24: * 1. Redistributions of source code must retain the above copyright
25: * notice, this list of conditions and the following disclaimer.
26: * 2. Redistributions in binary form must reproduce the above copyright
27: * notice, this list of conditions and the following disclaimer in the
28: * documentation and/or other materials provided with the distribution.
29: *
30: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.26 deraadt 40: */
1.1 deraadt 41:
1.265 deraadt 42: #include <sys/types.h>
1.336 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>
1.367 djm 57: #include <stdarg.h>
1.341 millert 58: #include <stdint.h>
1.263 stevesk 59: #include <stdio.h>
1.262 stevesk 60: #include <stdlib.h>
1.260 stevesk 61: #include <string.h>
1.233 stevesk 62: #include <termios.h>
1.256 stevesk 63: #include <unistd.h>
1.1 deraadt 64:
1.265 deraadt 65: #include "xmalloc.h"
1.1 deraadt 66: #include "ssh.h"
1.82 markus 67: #include "ssh2.h"
1.354 markus 68: #include "ssherr.h"
1.367 djm 69: #include "sshbuf.h"
1.1 deraadt 70: #include "packet.h"
1.82 markus 71: #include "log.h"
72: #include "misc.h"
1.14 markus 73: #include "channels.h"
74: #include "compat.h"
1.82 markus 75: #include "canohost.h"
1.383 markus 76: #include "sshkey.h"
1.64 markus 77: #include "authfd.h"
1.147 stevesk 78: #include "pathnames.h"
1.381 djm 79: #include "match.h"
1.1 deraadt 80:
1.367 djm 81: /* -- agent forwarding */
82: #define NUM_SOCKS 10
1.12 markus 83:
1.367 djm 84: /* -- tcp forwarding */
85: /* special-case port number meaning allow any port */
86: #define FWD_PERMIT_ANY_PORT 0
1.1 deraadt 87:
1.367 djm 88: /* special-case wildcard meaning allow any host */
89: #define FWD_PERMIT_ANY_HOST "*"
1.1 deraadt 90:
1.367 djm 91: /* -- X11 forwarding */
92: /* Maximum number of fake X11 displays to try. */
93: #define MAX_DISPLAYS 1000
1.1 deraadt 94:
1.381 djm 95: /* Per-channel callback for pre/post select() actions */
96: typedef void chan_fn(struct ssh *, Channel *c,
97: fd_set *readset, fd_set *writeset);
98:
1.27 markus 99: /*
100: * Data structure for storing which hosts are permitted for forward requests.
101: * The local sides of any remote forwards are stored in this array to prevent
102: * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
103: * network (which might be behind a firewall).
104: */
1.336 millert 105: /* XXX: streamlocal wants a path instead of host:port */
106: /* Overload host_to_connect; we could just make this match Forward */
107: /* XXX - can we use listen_host instead of listen_path? */
1.381 djm 108: struct permission {
1.41 markus 109: char *host_to_connect; /* Connect to 'host'. */
1.336 millert 110: int port_to_connect; /* Connect to 'port'. */
1.333 markus 111: char *listen_host; /* Remote side should listen address. */
1.336 millert 112: char *listen_path; /* Remote side should listen path. */
113: int listen_port; /* Remote side should listen port. */
1.354 markus 114: Channel *downstream; /* Downstream mux*/
1.381 djm 115: };
116:
117: /*
118: * Stores the forwarding permission state for a single direction (local or
119: * remote).
120: */
121: struct permission_set {
122: /*
123: * List of all local permitted host/port pairs to allow for the
124: * user.
125: */
126: u_int num_permitted_user;
127: struct permission *permitted_user;
1.1 deraadt 128:
1.381 djm 129: /*
130: * List of all permitted host/port pairs to allow for the admin.
131: */
132: u_int num_permitted_admin;
133: struct permission *permitted_admin;
134:
135: /*
136: * If this is true, all opens/listens are permitted. This is the
137: * case on the server on which we have to trust the client anyway,
138: * and the user could do anything after logging in.
139: */
140: int all_permitted;
141: };
1.121 markus 142:
1.367 djm 143: /* Master structure for channels state */
144: struct ssh_channels {
145: /*
146: * Pointer to an array containing all allocated channels. The array
147: * is dynamically extended as needed.
148: */
149: Channel **channels;
1.257 dtucker 150:
1.367 djm 151: /*
152: * Size of the channel array. All slots of the array must always be
153: * initialized (at least the type field); unused slots set to NULL
154: */
155: u_int channels_alloc;
1.257 dtucker 156:
1.367 djm 157: /*
158: * Maximum file descriptor value used in any of the channels. This is
159: * updated in channel_new.
160: */
161: int channel_max_fd;
1.257 dtucker 162:
1.367 djm 163: /*
164: * 'channel_pre*' are called just before select() to add any bits
165: * relevant to channels in the select bitmasks.
166: *
167: * 'channel_post*': perform any appropriate operations for
168: * channels which have events pending.
169: */
170: chan_fn **channel_pre;
171: chan_fn **channel_post;
1.314 dtucker 172:
1.367 djm 173: /* -- tcp forwarding */
1.381 djm 174: struct permission_set local_perms;
175: struct permission_set remote_perms;
1.219 djm 176:
1.367 djm 177: /* -- X11 forwarding */
1.121 markus 178:
1.367 djm 179: /* Saved X11 local (client) display. */
180: char *x11_saved_display;
1.121 markus 181:
1.367 djm 182: /* Saved X11 authentication protocol name. */
183: char *x11_saved_proto;
1.347 djm 184:
1.367 djm 185: /* Saved X11 authentication data. This is the real data. */
186: char *x11_saved_data;
187: u_int x11_saved_data_len;
1.121 markus 188:
1.367 djm 189: /* Deadline after which all X11 connections are refused */
190: u_int x11_refuse_time;
1.121 markus 191:
1.367 djm 192: /*
193: * Fake X11 authentication data. This is what the server will be
194: * sending us; we should replace any occurrences of this by the
195: * real data.
196: */
197: u_char *x11_fake_data;
198: u_int x11_fake_data_len;
1.121 markus 199:
1.367 djm 200: /* AF_UNSPEC or AF_INET or AF_INET6 */
201: int IPv4or6;
202: };
1.1 deraadt 203:
1.121 markus 204: /* helper */
1.367 djm 205: static void port_open_helper(struct ssh *ssh, Channel *c, char *rtype);
1.354 markus 206: static const char *channel_rfwd_bind_host(const char *listen_host);
1.103 markus 207:
1.276 djm 208: /* non-blocking connect helpers */
209: static int connect_next(struct channel_connect *);
210: static void channel_connect_ctx_free(struct channel_connect *);
1.372 markus 211: static Channel *rdynamic_connect_prepare(struct ssh *, char *, char *);
212: static int rdynamic_connect_finish(struct ssh *, Channel *);
1.276 djm 213:
1.367 djm 214: /* Setup helper */
215: static void channel_handler_init(struct ssh_channels *sc);
216:
1.121 markus 217: /* -- channel core */
1.41 markus 218:
1.367 djm 219: void
220: channel_init_channels(struct ssh *ssh)
221: {
222: struct ssh_channels *sc;
223:
224: if ((sc = calloc(1, sizeof(*sc))) == NULL ||
225: (sc->channel_pre = calloc(SSH_CHANNEL_MAX_TYPE,
226: sizeof(*sc->channel_pre))) == NULL ||
227: (sc->channel_post = calloc(SSH_CHANNEL_MAX_TYPE,
228: sizeof(*sc->channel_post))) == NULL)
229: fatal("%s: allocation failed", __func__);
230: sc->channels_alloc = 10;
231: sc->channels = xcalloc(sc->channels_alloc, sizeof(*sc->channels));
232: sc->IPv4or6 = AF_UNSPEC;
233: channel_handler_init(sc);
234:
235: ssh->chanctxt = sc;
236: }
237:
1.41 markus 238: Channel *
1.367 djm 239: channel_by_id(struct ssh *ssh, int id)
1.41 markus 240: {
241: Channel *c;
1.113 markus 242:
1.367 djm 243: if (id < 0 || (u_int)id >= ssh->chanctxt->channels_alloc) {
244: logit("%s: %d: bad id", __func__, id);
1.41 markus 245: return NULL;
246: }
1.367 djm 247: c = ssh->chanctxt->channels[id];
1.113 markus 248: if (c == NULL) {
1.367 djm 249: logit("%s: %d: bad id: channel free", __func__, id);
1.41 markus 250: return NULL;
251: }
252: return c;
1.55 markus 253: }
254:
1.354 markus 255: Channel *
1.368 djm 256: channel_by_remote_id(struct ssh *ssh, u_int remote_id)
1.354 markus 257: {
258: Channel *c;
259: u_int i;
260:
1.367 djm 261: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
262: c = ssh->chanctxt->channels[i];
1.368 djm 263: if (c != NULL && c->have_remote_id && c->remote_id == remote_id)
1.354 markus 264: return c;
265: }
266: return NULL;
267: }
268:
1.27 markus 269: /*
1.229 markus 270: * Returns the channel if it is allowed to receive protocol messages.
271: * Private channels, like listening sockets, may not receive messages.
272: */
273: Channel *
1.367 djm 274: channel_lookup(struct ssh *ssh, int id)
1.229 markus 275: {
276: Channel *c;
277:
1.367 djm 278: if ((c = channel_by_id(ssh, id)) == NULL)
279: return NULL;
1.229 markus 280:
1.237 deraadt 281: switch (c->type) {
1.229 markus 282: case SSH_CHANNEL_X11_OPEN:
283: case SSH_CHANNEL_LARVAL:
284: case SSH_CHANNEL_CONNECTING:
285: case SSH_CHANNEL_DYNAMIC:
1.372 markus 286: case SSH_CHANNEL_RDYNAMIC_OPEN:
287: case SSH_CHANNEL_RDYNAMIC_FINISH:
1.229 markus 288: case SSH_CHANNEL_OPENING:
289: case SSH_CHANNEL_OPEN:
1.323 dtucker 290: case SSH_CHANNEL_ABANDONED:
1.354 markus 291: case SSH_CHANNEL_MUX_PROXY:
1.367 djm 292: return c;
1.229 markus 293: }
294: logit("Non-public channel %d, type %d.", id, c->type);
1.367 djm 295: return NULL;
1.229 markus 296: }
297:
298: /*
1.55 markus 299: * Register filedescriptors for a channel, used when allocating a channel or
1.52 markus 300: * when the channel consumer/producer is ready, e.g. shell exec'd
1.27 markus 301: */
1.127 itojun 302: static void
1.367 djm 303: channel_register_fds(struct ssh *ssh, Channel *c, int rfd, int wfd, int efd,
1.282 dtucker 304: int extusage, int nonblock, int is_tty)
1.1 deraadt 305: {
1.367 djm 306: struct ssh_channels *sc = ssh->chanctxt;
307:
1.25 markus 308: /* Update the maximum file descriptor value. */
1.367 djm 309: sc->channel_max_fd = MAXIMUM(sc->channel_max_fd, rfd);
310: sc->channel_max_fd = MAXIMUM(sc->channel_max_fd, wfd);
311: sc->channel_max_fd = MAXIMUM(sc->channel_max_fd, efd);
1.84 markus 312:
1.298 dtucker 313: if (rfd != -1)
314: fcntl(rfd, F_SETFD, FD_CLOEXEC);
315: if (wfd != -1 && wfd != rfd)
316: fcntl(wfd, F_SETFD, FD_CLOEXEC);
317: if (efd != -1 && efd != rfd && efd != wfd)
318: fcntl(efd, F_SETFD, FD_CLOEXEC);
1.55 markus 319:
1.52 markus 320: c->rfd = rfd;
321: c->wfd = wfd;
322: c->sock = (rfd == wfd) ? rfd : -1;
323: c->efd = efd;
324: c->extended_usage = extusage;
1.71 markus 325:
1.282 dtucker 326: if ((c->isatty = is_tty) != 0)
1.194 markus 327: debug2("channel %d: rfd %d isatty", c->self, c->rfd);
1.91 markus 328:
1.71 markus 329: /* enable nonblocking mode */
330: if (nonblock) {
331: if (rfd != -1)
332: set_nonblock(rfd);
333: if (wfd != -1)
334: set_nonblock(wfd);
335: if (efd != -1)
336: set_nonblock(efd);
337: }
1.52 markus 338: }
339:
340: /*
341: * Allocate a new channel object and set its type and socket. This will cause
342: * remote_name to be freed.
343: */
1.113 markus 344: Channel *
1.367 djm 345: channel_new(struct ssh *ssh, char *ctype, int type, int rfd, int wfd, int efd,
1.178 markus 346: u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock)
1.52 markus 347: {
1.367 djm 348: struct ssh_channels *sc = ssh->chanctxt;
349: u_int i, found;
1.52 markus 350: Channel *c;
1.25 markus 351:
352: /* Try to find a free slot where to put the new channel. */
1.367 djm 353: for (i = 0; i < sc->channels_alloc; i++) {
354: if (sc->channels[i] == NULL) {
1.25 markus 355: /* Found a free slot. */
1.367 djm 356: found = i;
1.25 markus 357: break;
358: }
1.367 djm 359: }
360: if (i >= sc->channels_alloc) {
361: /*
362: * There are no free slots. Take last+1 slot and expand
363: * the array.
364: */
365: found = sc->channels_alloc;
366: if (sc->channels_alloc > CHANNELS_MAX_CHANNELS)
367: fatal("%s: internal error: channels_alloc %d too big",
368: __func__, sc->channels_alloc);
369: sc->channels = xrecallocarray(sc->channels, sc->channels_alloc,
370: sc->channels_alloc + 10, sizeof(*sc->channels));
371: sc->channels_alloc += 10;
372: debug2("channel: expanding %d", sc->channels_alloc);
1.25 markus 373: }
1.113 markus 374: /* Initialize and return new channel. */
1.367 djm 375: c = sc->channels[found] = xcalloc(1, sizeof(Channel));
376: if ((c->input = sshbuf_new()) == NULL ||
377: (c->output = sshbuf_new()) == NULL ||
378: (c->extended = sshbuf_new()) == NULL)
379: fatal("%s: sshbuf_new failed", __func__);
1.159 markus 380: c->ostate = CHAN_OUTPUT_OPEN;
381: c->istate = CHAN_INPUT_OPEN;
1.367 djm 382: channel_register_fds(ssh, c, rfd, wfd, efd, extusage, nonblock, 0);
1.25 markus 383: c->self = found;
384: c->type = type;
1.41 markus 385: c->ctype = ctype;
1.51 markus 386: c->local_window = window;
387: c->local_window_max = window;
388: c->local_maxpacket = maxpack;
1.190 markus 389: c->remote_name = xstrdup(remote_name);
1.302 djm 390: c->ctl_chan = -1;
1.299 markus 391: c->delayed = 1; /* prevent call to channel_post handler */
1.275 djm 392: TAILQ_INIT(&c->status_confirms);
1.25 markus 393: debug("channel %d: new [%s]", found, remote_name);
1.113 markus 394: return c;
1.1 deraadt 395: }
1.52 markus 396:
1.367 djm 397: static void
398: channel_find_maxfd(struct ssh_channels *sc)
1.132 markus 399: {
1.209 avsm 400: u_int i;
401: int max = 0;
1.132 markus 402: Channel *c;
403:
1.367 djm 404: for (i = 0; i < sc->channels_alloc; i++) {
405: c = sc->channels[i];
1.132 markus 406: if (c != NULL) {
1.352 deraadt 407: max = MAXIMUM(max, c->rfd);
408: max = MAXIMUM(max, c->wfd);
409: max = MAXIMUM(max, c->efd);
1.132 markus 410: }
411: }
1.367 djm 412: sc->channel_max_fd = max;
1.132 markus 413: }
414:
415: int
1.367 djm 416: channel_close_fd(struct ssh *ssh, int *fdp)
1.132 markus 417: {
1.367 djm 418: struct ssh_channels *sc = ssh->chanctxt;
1.132 markus 419: int ret = 0, fd = *fdp;
420:
421: if (fd != -1) {
422: ret = close(fd);
423: *fdp = -1;
1.367 djm 424: if (fd == sc->channel_max_fd)
425: channel_find_maxfd(sc);
1.132 markus 426: }
427: return ret;
428: }
429:
1.52 markus 430: /* Close all channel fd/socket. */
1.127 itojun 431: static void
1.367 djm 432: channel_close_fds(struct ssh *ssh, Channel *c)
433: {
1.379 tb 434: int sock = c->sock, rfd = c->rfd, wfd = c->wfd, efd = c->efd;
435:
1.367 djm 436: channel_close_fd(ssh, &c->sock);
1.379 tb 437: if (rfd != sock)
438: channel_close_fd(ssh, &c->rfd);
439: if (wfd != sock && wfd != rfd)
440: channel_close_fd(ssh, &c->wfd);
441: if (efd != sock && efd != rfd && efd != wfd)
442: channel_close_fd(ssh, &c->efd);
1.367 djm 443: }
444:
445: static void
1.381 djm 446: fwd_perm_clear(struct permission *perm)
1.52 markus 447: {
1.381 djm 448: free(perm->host_to_connect);
449: free(perm->listen_host);
450: free(perm->listen_path);
451: bzero(perm, sizeof(*perm));
1.367 djm 452: }
453:
1.381 djm 454: /* Returns an printable name for the specified forwarding permission list */
455: static const char *
456: fwd_ident(int who, int where)
457: {
458: if (who == FORWARD_ADM) {
459: if (where == FORWARD_LOCAL)
460: return "admin local";
461: else if (where == FORWARD_REMOTE)
462: return "admin remote";
463: } else if (who == FORWARD_USER) {
464: if (where == FORWARD_LOCAL)
465: return "user local";
466: else if (where == FORWARD_REMOTE)
467: return "user remote";
468: }
469: fatal("Unknown forward permission list %d/%d", who, where);
470: }
471:
472: /* Returns the forwarding permission list for the specified direction */
473: static struct permission_set *
474: permission_set_get(struct ssh *ssh, int where)
475: {
476: struct ssh_channels *sc = ssh->chanctxt;
1.367 djm 477:
1.381 djm 478: switch (where) {
479: case FORWARD_LOCAL:
480: return &sc->local_perms;
481: break;
482: case FORWARD_REMOTE:
483: return &sc->remote_perms;
484: break;
485: default:
486: fatal("%s: invalid forwarding direction %d", __func__, where);
487: }
488: }
489:
490: /* Reutrns pointers to the specified forwarding list and its element count */
491: static void
492: permission_set_get_array(struct ssh *ssh, int who, int where,
493: struct permission ***permpp, u_int **npermpp)
494: {
495: struct permission_set *pset = permission_set_get(ssh, where);
496:
497: switch (who) {
498: case FORWARD_USER:
499: *permpp = &pset->permitted_user;
500: *npermpp = &pset->num_permitted_user;
501: break;
502: case FORWARD_ADM:
503: *permpp = &pset->permitted_admin;
504: *npermpp = &pset->num_permitted_admin;
505: break;
506: default:
507: fatal("%s: invalid forwarding client %d", __func__, who);
508: }
509: }
510:
511: /* Adds an entry to the spcified forwarding list */
1.367 djm 512: static int
1.381 djm 513: permission_set_add(struct ssh *ssh, int who, int where,
1.367 djm 514: const char *host_to_connect, int port_to_connect,
515: const char *listen_host, const char *listen_path, int listen_port,
516: Channel *downstream)
517: {
1.381 djm 518: struct permission **permp;
519: u_int n, *npermp;
1.367 djm 520:
1.381 djm 521: permission_set_get_array(ssh, who, where, &permp, &npermp);
1.367 djm 522:
1.381 djm 523: if (*npermp >= INT_MAX)
524: fatal("%s: %s overflow", __func__, fwd_ident(who, where));
1.367 djm 525:
1.381 djm 526: *permp = xrecallocarray(*permp, *npermp, *npermp + 1, sizeof(**permp));
527: n = (*npermp)++;
1.367 djm 528: #define MAYBE_DUP(s) ((s == NULL) ? NULL : xstrdup(s))
1.381 djm 529: (*permp)[n].host_to_connect = MAYBE_DUP(host_to_connect);
530: (*permp)[n].port_to_connect = port_to_connect;
531: (*permp)[n].listen_host = MAYBE_DUP(listen_host);
532: (*permp)[n].listen_path = MAYBE_DUP(listen_path);
533: (*permp)[n].listen_port = listen_port;
534: (*permp)[n].downstream = downstream;
1.367 djm 535: #undef MAYBE_DUP
536: return (int)n;
537: }
538:
539: static void
540: mux_remove_remote_forwardings(struct ssh *ssh, Channel *c)
541: {
542: struct ssh_channels *sc = ssh->chanctxt;
1.381 djm 543: struct permission_set *pset = &sc->local_perms;
544: struct permission *perm;
1.367 djm 545: int r;
546: u_int i;
547:
1.381 djm 548: for (i = 0; i < pset->num_permitted_user; i++) {
549: perm = &pset->permitted_user[i];
550: if (perm->downstream != c)
1.367 djm 551: continue;
552:
553: /* cancel on the server, since mux client is gone */
554: debug("channel %d: cleanup remote forward for %s:%u",
1.381 djm 555: c->self, perm->listen_host, perm->listen_port);
1.367 djm 556: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
557: (r = sshpkt_put_cstring(ssh,
558: "cancel-tcpip-forward")) != 0 ||
559: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
560: (r = sshpkt_put_cstring(ssh,
1.381 djm 561: channel_rfwd_bind_host(perm->listen_host))) != 0 ||
562: (r = sshpkt_put_u32(ssh, perm->listen_port)) != 0 ||
1.367 djm 563: (r = sshpkt_send(ssh)) != 0) {
564: fatal("%s: channel %i: %s", __func__,
565: c->self, ssh_err(r));
566: }
1.381 djm 567: fwd_perm_clear(perm); /* unregister */
1.367 djm 568: }
1.121 markus 569: }
570:
571: /* Free the channel and close its fd/socket. */
572: void
1.367 djm 573: channel_free(struct ssh *ssh, Channel *c)
1.121 markus 574: {
1.367 djm 575: struct ssh_channels *sc = ssh->chanctxt;
1.121 markus 576: char *s;
1.209 avsm 577: u_int i, n;
1.354 markus 578: Channel *other;
1.275 djm 579: struct channel_confirm *cc;
1.121 markus 580:
1.367 djm 581: for (n = 0, i = 0; i < sc->channels_alloc; i++) {
582: if ((other = sc->channels[i]) == NULL)
583: continue;
584: n++;
585: /* detach from mux client and prepare for closing */
586: if (c->type == SSH_CHANNEL_MUX_CLIENT &&
587: other->type == SSH_CHANNEL_MUX_PROXY &&
588: other->mux_ctx == c) {
589: other->mux_ctx = NULL;
590: other->type = SSH_CHANNEL_OPEN;
591: other->istate = CHAN_INPUT_CLOSED;
592: other->ostate = CHAN_OUTPUT_CLOSED;
1.354 markus 593: }
594: }
1.209 avsm 595: debug("channel %d: free: %s, nchannels %u", c->self,
1.121 markus 596: c->remote_name ? c->remote_name : "???", n);
597:
1.367 djm 598: if (c->type == SSH_CHANNEL_MUX_CLIENT)
599: mux_remove_remote_forwardings(ssh, c);
1.354 markus 600:
1.384 markus 601: if (log_level_get() >= SYSLOG_LEVEL_DEBUG3) {
602: s = channel_open_message(ssh);
603: debug3("channel %d: status: %s", c->self, s);
604: free(s);
605: }
1.121 markus 606:
1.367 djm 607: channel_close_fds(ssh, c);
608: sshbuf_free(c->input);
609: sshbuf_free(c->output);
610: sshbuf_free(c->extended);
611: c->input = c->output = c->extended = NULL;
1.321 djm 612: free(c->remote_name);
613: c->remote_name = NULL;
614: free(c->path);
615: c->path = NULL;
616: free(c->listening_addr);
617: c->listening_addr = NULL;
1.275 djm 618: while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) {
619: if (cc->abandon_cb != NULL)
1.367 djm 620: cc->abandon_cb(ssh, c, cc->ctx);
1.275 djm 621: TAILQ_REMOVE(&c->status_confirms, cc, entry);
1.329 tedu 622: explicit_bzero(cc, sizeof(*cc));
1.321 djm 623: free(cc);
1.275 djm 624: }
1.280 djm 625: if (c->filter_cleanup != NULL && c->filter_ctx != NULL)
1.367 djm 626: c->filter_cleanup(ssh, c->self, c->filter_ctx);
627: sc->channels[c->self] = NULL;
1.371 millert 628: explicit_bzero(c, sizeof(*c));
1.321 djm 629: free(c);
1.121 markus 630: }
631:
632: void
1.367 djm 633: channel_free_all(struct ssh *ssh)
1.121 markus 634: {
1.209 avsm 635: u_int i;
1.121 markus 636:
1.367 djm 637: for (i = 0; i < ssh->chanctxt->channels_alloc; i++)
638: if (ssh->chanctxt->channels[i] != NULL)
639: channel_free(ssh, ssh->chanctxt->channels[i]);
1.131 markus 640: }
641:
1.121 markus 642: /*
643: * Closes the sockets/fds of all channels. This is used to close extra file
644: * descriptors after a fork.
645: */
646: void
1.367 djm 647: channel_close_all(struct ssh *ssh)
1.121 markus 648: {
1.209 avsm 649: u_int i;
1.121 markus 650:
1.367 djm 651: for (i = 0; i < ssh->chanctxt->channels_alloc; i++)
652: if (ssh->chanctxt->channels[i] != NULL)
653: channel_close_fds(ssh, ssh->chanctxt->channels[i]);
1.121 markus 654: }
655:
656: /*
1.131 markus 657: * Stop listening to channels.
658: */
659: void
1.367 djm 660: channel_stop_listening(struct ssh *ssh)
1.131 markus 661: {
1.209 avsm 662: u_int i;
1.131 markus 663: Channel *c;
664:
1.367 djm 665: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
666: c = ssh->chanctxt->channels[i];
1.131 markus 667: if (c != NULL) {
668: switch (c->type) {
669: case SSH_CHANNEL_AUTH_SOCKET:
670: case SSH_CHANNEL_PORT_LISTENER:
671: case SSH_CHANNEL_RPORT_LISTENER:
672: case SSH_CHANNEL_X11_LISTENER:
1.336 millert 673: case SSH_CHANNEL_UNIX_LISTENER:
674: case SSH_CHANNEL_RUNIX_LISTENER:
1.367 djm 675: channel_close_fd(ssh, &c->sock);
676: channel_free(ssh, c);
1.131 markus 677: break;
678: }
679: }
680: }
681: }
682:
683: /*
1.121 markus 684: * Returns true if no channel has too much buffered data, and false if one or
685: * more channel is overfull.
686: */
687: int
1.367 djm 688: channel_not_very_much_buffered_data(struct ssh *ssh)
1.121 markus 689: {
690: u_int i;
1.367 djm 691: u_int maxsize = ssh_packet_get_maxsize(ssh);
1.121 markus 692: Channel *c;
693:
1.367 djm 694: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
695: c = ssh->chanctxt->channels[i];
696: if (c == NULL || c->type != SSH_CHANNEL_OPEN)
697: continue;
698: if (sshbuf_len(c->output) > maxsize) {
699: debug2("channel %d: big output buffer %zu > %u",
700: c->self, sshbuf_len(c->output), maxsize);
701: return 0;
1.121 markus 702: }
703: }
704: return 1;
705: }
706:
707: /* Returns true if any channel is still open. */
708: int
1.367 djm 709: channel_still_open(struct ssh *ssh)
1.121 markus 710: {
1.209 avsm 711: u_int i;
1.121 markus 712: Channel *c;
713:
1.367 djm 714: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
715: c = ssh->chanctxt->channels[i];
1.121 markus 716: if (c == NULL)
717: continue;
718: switch (c->type) {
719: case SSH_CHANNEL_X11_LISTENER:
720: case SSH_CHANNEL_PORT_LISTENER:
721: case SSH_CHANNEL_RPORT_LISTENER:
1.302 djm 722: case SSH_CHANNEL_MUX_LISTENER:
1.121 markus 723: case SSH_CHANNEL_CLOSED:
724: case SSH_CHANNEL_AUTH_SOCKET:
725: case SSH_CHANNEL_DYNAMIC:
1.372 markus 726: case SSH_CHANNEL_RDYNAMIC_OPEN:
1.121 markus 727: case SSH_CHANNEL_CONNECTING:
728: case SSH_CHANNEL_ZOMBIE:
1.323 dtucker 729: case SSH_CHANNEL_ABANDONED:
1.336 millert 730: case SSH_CHANNEL_UNIX_LISTENER:
731: case SSH_CHANNEL_RUNIX_LISTENER:
1.121 markus 732: continue;
733: case SSH_CHANNEL_LARVAL:
734: continue;
735: case SSH_CHANNEL_OPENING:
736: case SSH_CHANNEL_OPEN:
1.372 markus 737: case SSH_CHANNEL_RDYNAMIC_FINISH:
1.121 markus 738: case SSH_CHANNEL_X11_OPEN:
1.302 djm 739: case SSH_CHANNEL_MUX_CLIENT:
1.354 markus 740: case SSH_CHANNEL_MUX_PROXY:
1.121 markus 741: return 1;
742: default:
1.358 djm 743: fatal("%s: bad channel type %d", __func__, c->type);
1.121 markus 744: /* NOTREACHED */
745: }
746: }
747: return 0;
748: }
749:
750: /* Returns the id of an open channel suitable for keepaliving */
751: int
1.367 djm 752: channel_find_open(struct ssh *ssh)
1.121 markus 753: {
1.209 avsm 754: u_int i;
1.121 markus 755: Channel *c;
756:
1.367 djm 757: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
758: c = ssh->chanctxt->channels[i];
1.368 djm 759: if (c == NULL || !c->have_remote_id)
1.121 markus 760: continue;
761: switch (c->type) {
762: case SSH_CHANNEL_CLOSED:
763: case SSH_CHANNEL_DYNAMIC:
1.372 markus 764: case SSH_CHANNEL_RDYNAMIC_OPEN:
765: case SSH_CHANNEL_RDYNAMIC_FINISH:
1.121 markus 766: case SSH_CHANNEL_X11_LISTENER:
767: case SSH_CHANNEL_PORT_LISTENER:
768: case SSH_CHANNEL_RPORT_LISTENER:
1.302 djm 769: case SSH_CHANNEL_MUX_LISTENER:
770: case SSH_CHANNEL_MUX_CLIENT:
1.354 markus 771: case SSH_CHANNEL_MUX_PROXY:
1.121 markus 772: case SSH_CHANNEL_OPENING:
773: case SSH_CHANNEL_CONNECTING:
774: case SSH_CHANNEL_ZOMBIE:
1.323 dtucker 775: case SSH_CHANNEL_ABANDONED:
1.336 millert 776: case SSH_CHANNEL_UNIX_LISTENER:
777: case SSH_CHANNEL_RUNIX_LISTENER:
1.121 markus 778: continue;
779: case SSH_CHANNEL_LARVAL:
780: case SSH_CHANNEL_AUTH_SOCKET:
781: case SSH_CHANNEL_OPEN:
782: case SSH_CHANNEL_X11_OPEN:
783: return i;
784: default:
1.358 djm 785: fatal("%s: bad channel type %d", __func__, c->type);
1.121 markus 786: /* NOTREACHED */
787: }
788: }
789: return -1;
790: }
791:
1.385 ! djm 792: /* Returns the state of the channel's extended usage flag */
! 793: const char *
! 794: channel_format_extended_usage(const Channel *c)
! 795: {
! 796: if (c->efd == -1)
! 797: return "closed";
! 798:
! 799: switch (c->extended_usage) {
! 800: case CHAN_EXTENDED_WRITE:
! 801: return "write";
! 802: case CHAN_EXTENDED_READ:
! 803: return "read";
! 804: case CHAN_EXTENDED_IGNORE:
! 805: return "ignore";
! 806: default:
! 807: return "UNKNOWN";
! 808: }
! 809: }
! 810:
1.121 markus 811: /*
812: * Returns a message describing the currently open forwarded connections,
813: * suitable for sending to the client. The message contains crlf pairs for
814: * newlines.
815: */
816: char *
1.367 djm 817: channel_open_message(struct ssh *ssh)
1.121 markus 818: {
1.367 djm 819: struct sshbuf *buf;
1.121 markus 820: Channel *c;
1.209 avsm 821: u_int i;
1.367 djm 822: int r;
823: char *ret;
1.121 markus 824:
1.367 djm 825: if ((buf = sshbuf_new()) == NULL)
826: fatal("%s: sshbuf_new", __func__);
827: if ((r = sshbuf_putf(buf,
828: "The following connections are open:\r\n")) != 0)
829: fatal("%s: sshbuf_putf: %s", __func__, ssh_err(r));
830: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
831: c = ssh->chanctxt->channels[i];
1.121 markus 832: if (c == NULL)
833: continue;
834: switch (c->type) {
835: case SSH_CHANNEL_X11_LISTENER:
836: case SSH_CHANNEL_PORT_LISTENER:
837: case SSH_CHANNEL_RPORT_LISTENER:
838: case SSH_CHANNEL_CLOSED:
839: case SSH_CHANNEL_AUTH_SOCKET:
840: case SSH_CHANNEL_ZOMBIE:
1.323 dtucker 841: case SSH_CHANNEL_ABANDONED:
1.302 djm 842: case SSH_CHANNEL_MUX_LISTENER:
1.336 millert 843: case SSH_CHANNEL_UNIX_LISTENER:
844: case SSH_CHANNEL_RUNIX_LISTENER:
1.121 markus 845: continue;
846: case SSH_CHANNEL_LARVAL:
847: case SSH_CHANNEL_OPENING:
848: case SSH_CHANNEL_CONNECTING:
849: case SSH_CHANNEL_DYNAMIC:
1.372 markus 850: case SSH_CHANNEL_RDYNAMIC_OPEN:
851: case SSH_CHANNEL_RDYNAMIC_FINISH:
1.121 markus 852: case SSH_CHANNEL_OPEN:
853: case SSH_CHANNEL_X11_OPEN:
1.354 markus 854: case SSH_CHANNEL_MUX_PROXY:
855: case SSH_CHANNEL_MUX_CLIENT:
1.367 djm 856: if ((r = sshbuf_putf(buf, " #%d %.300s "
1.385 ! djm 857: "(t%d %s%u i%u/%zu o%u/%zu "
! 858: "fd %d/%d/%d [%s] sock %d cc %d)\r\n",
1.121 markus 859: c->self, c->remote_name,
1.368 djm 860: c->type,
861: c->have_remote_id ? "r" : "nr", c->remote_id,
1.367 djm 862: c->istate, sshbuf_len(c->input),
863: c->ostate, sshbuf_len(c->output),
1.385 ! djm 864: c->rfd, c->wfd, c->efd,
! 865: channel_format_extended_usage(c),
! 866: c->sock, c->ctl_chan)) != 0)
1.367 djm 867: fatal("%s: sshbuf_putf: %s",
868: __func__, ssh_err(r));
1.121 markus 869: continue;
870: default:
1.367 djm 871: fatal("%s: bad channel type %d", __func__, c->type);
1.121 markus 872: /* NOTREACHED */
873: }
874: }
1.367 djm 875: if ((ret = sshbuf_dup_string(buf)) == NULL)
876: fatal("%s: sshbuf_dup_string", __func__);
877: sshbuf_free(buf);
878: return ret;
879: }
880:
881: static void
882: open_preamble(struct ssh *ssh, const char *where, Channel *c, const char *type)
883: {
884: int r;
885:
886: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
887: (r = sshpkt_put_cstring(ssh, type)) != 0 ||
888: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
889: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
890: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0) {
891: fatal("%s: channel %i: open: %s", where, c->self, ssh_err(r));
892: }
1.121 markus 893: }
894:
895: void
1.367 djm 896: channel_send_open(struct ssh *ssh, int id)
1.121 markus 897: {
1.367 djm 898: Channel *c = channel_lookup(ssh, id);
899: int r;
1.180 deraadt 900:
1.121 markus 901: if (c == NULL) {
1.188 itojun 902: logit("channel_send_open: %d: bad id", id);
1.121 markus 903: return;
904: }
1.184 markus 905: debug2("channel %d: send open", id);
1.367 djm 906: open_preamble(ssh, __func__, c, c->ctype);
907: if ((r = sshpkt_send(ssh)) != 0)
908: fatal("%s: channel %i: %s", __func__, c->self, ssh_err(r));
1.121 markus 909: }
910:
911: void
1.367 djm 912: channel_request_start(struct ssh *ssh, int id, char *service, int wantconfirm)
1.121 markus 913: {
1.367 djm 914: Channel *c = channel_lookup(ssh, id);
915: int r;
1.180 deraadt 916:
1.121 markus 917: if (c == NULL) {
1.367 djm 918: logit("%s: %d: unknown channel id", __func__, id);
1.121 markus 919: return;
920: }
1.368 djm 921: if (!c->have_remote_id)
922: fatal(":%s: channel %d: no remote id", __func__, c->self);
923:
1.204 djm 924: debug2("channel %d: request %s confirm %d", id, service, wantconfirm);
1.367 djm 925: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_REQUEST)) != 0 ||
926: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
927: (r = sshpkt_put_cstring(ssh, service)) != 0 ||
928: (r = sshpkt_put_u8(ssh, wantconfirm)) != 0) {
929: fatal("%s: channel %i: %s", __func__, c->self, ssh_err(r));
930: }
1.121 markus 931: }
1.241 deraadt 932:
1.121 markus 933: void
1.367 djm 934: channel_register_status_confirm(struct ssh *ssh, int id,
935: channel_confirm_cb *cb, channel_confirm_abandon_cb *abandon_cb, void *ctx)
1.275 djm 936: {
937: struct channel_confirm *cc;
938: Channel *c;
939:
1.367 djm 940: if ((c = channel_lookup(ssh, id)) == NULL)
941: fatal("%s: %d: bad id", __func__, id);
1.275 djm 942:
1.327 djm 943: cc = xcalloc(1, sizeof(*cc));
1.275 djm 944: cc->cb = cb;
945: cc->abandon_cb = abandon_cb;
946: cc->ctx = ctx;
947: TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry);
948: }
949:
950: void
1.367 djm 951: channel_register_open_confirm(struct ssh *ssh, int id,
952: channel_open_fn *fn, void *ctx)
1.121 markus 953: {
1.367 djm 954: Channel *c = channel_lookup(ssh, id);
1.180 deraadt 955:
1.121 markus 956: if (c == NULL) {
1.367 djm 957: logit("%s: %d: bad id", __func__, id);
1.121 markus 958: return;
959: }
1.275 djm 960: c->open_confirm = fn;
961: c->open_confirm_ctx = ctx;
1.121 markus 962: }
1.241 deraadt 963:
1.121 markus 964: void
1.367 djm 965: channel_register_cleanup(struct ssh *ssh, int id,
966: channel_callback_fn *fn, int do_close)
1.121 markus 967: {
1.367 djm 968: Channel *c = channel_by_id(ssh, id);
1.180 deraadt 969:
1.121 markus 970: if (c == NULL) {
1.367 djm 971: logit("%s: %d: bad id", __func__, id);
1.121 markus 972: return;
973: }
1.131 markus 974: c->detach_user = fn;
1.225 djm 975: c->detach_close = do_close;
1.121 markus 976: }
1.241 deraadt 977:
1.121 markus 978: void
1.367 djm 979: channel_cancel_cleanup(struct ssh *ssh, int id)
1.121 markus 980: {
1.367 djm 981: Channel *c = channel_by_id(ssh, id);
1.180 deraadt 982:
1.121 markus 983: if (c == NULL) {
1.367 djm 984: logit("%s: %d: bad id", __func__, id);
1.121 markus 985: return;
1.52 markus 986: }
1.131 markus 987: c->detach_user = NULL;
1.225 djm 988: c->detach_close = 0;
1.121 markus 989: }
1.241 deraadt 990:
1.121 markus 991: void
1.367 djm 992: channel_register_filter(struct ssh *ssh, int id, channel_infilter_fn *ifn,
1.280 djm 993: channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx)
1.121 markus 994: {
1.367 djm 995: Channel *c = channel_lookup(ssh, id);
1.180 deraadt 996:
1.121 markus 997: if (c == NULL) {
1.367 djm 998: logit("%s: %d: bad id", __func__, id);
1.121 markus 999: return;
1.52 markus 1000: }
1.231 reyk 1001: c->input_filter = ifn;
1002: c->output_filter = ofn;
1.279 djm 1003: c->filter_ctx = ctx;
1.280 djm 1004: c->filter_cleanup = cfn;
1.52 markus 1005: }
1006:
1.49 markus 1007: void
1.367 djm 1008: channel_set_fds(struct ssh *ssh, int id, int rfd, int wfd, int efd,
1.282 dtucker 1009: int extusage, int nonblock, int is_tty, u_int window_max)
1.1 deraadt 1010: {
1.367 djm 1011: Channel *c = channel_lookup(ssh, id);
1012: int r;
1.180 deraadt 1013:
1.121 markus 1014: if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
1015: fatal("channel_activate for non-larval channel %d.", id);
1.368 djm 1016: if (!c->have_remote_id)
1017: fatal(":%s: channel %d: no remote id", __func__, c->self);
1018:
1.367 djm 1019: channel_register_fds(ssh, c, rfd, wfd, efd, extusage, nonblock, is_tty);
1.121 markus 1020: c->type = SSH_CHANNEL_OPEN;
1.168 markus 1021: c->local_window = c->local_window_max = window_max;
1.367 djm 1022:
1023: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST)) != 0 ||
1024: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1025: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1026: (r = sshpkt_send(ssh)) != 0)
1027: fatal("%s: channel %i: %s", __func__, c->self, ssh_err(r));
1.1 deraadt 1028: }
1029:
1.127 itojun 1030: static void
1.367 djm 1031: channel_pre_listener(struct ssh *ssh, Channel *c,
1032: fd_set *readset, fd_set *writeset)
1.41 markus 1033: {
1034: FD_SET(c->sock, readset);
1035: }
1036:
1.127 itojun 1037: static void
1.367 djm 1038: channel_pre_connecting(struct ssh *ssh, Channel *c,
1039: fd_set *readset, fd_set *writeset)
1.75 markus 1040: {
1041: debug3("channel %d: waiting for connection", c->self);
1042: FD_SET(c->sock, writeset);
1043: }
1044:
1.127 itojun 1045: static void
1.367 djm 1046: channel_pre_open(struct ssh *ssh, Channel *c,
1047: fd_set *readset, fd_set *writeset)
1.41 markus 1048: {
1.44 markus 1049: if (c->istate == CHAN_INPUT_OPEN &&
1.358 djm 1050: c->remote_window > 0 &&
1.367 djm 1051: sshbuf_len(c->input) < c->remote_window &&
1052: sshbuf_check_reserve(c->input, CHAN_RBUF) == 0)
1.44 markus 1053: FD_SET(c->rfd, readset);
1054: if (c->ostate == CHAN_OUTPUT_OPEN ||
1055: c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
1.367 djm 1056: if (sshbuf_len(c->output) > 0) {
1.44 markus 1057: FD_SET(c->wfd, writeset);
1058: } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
1.172 markus 1059: if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
1.367 djm 1060: debug2("channel %d: "
1061: "obuf_empty delayed efd %d/(%zu)", c->self,
1062: c->efd, sshbuf_len(c->extended));
1.172 markus 1063: else
1.367 djm 1064: chan_obuf_empty(ssh, c);
1.44 markus 1065: }
1066: }
1067: /** XXX check close conditions, too */
1.358 djm 1068: if (c->efd != -1 && !(c->istate == CHAN_INPUT_CLOSED &&
1069: c->ostate == CHAN_OUTPUT_CLOSED)) {
1.44 markus 1070: if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1.367 djm 1071: sshbuf_len(c->extended) > 0)
1.44 markus 1072: FD_SET(c->efd, writeset);
1.306 djm 1073: else if (c->efd != -1 && !(c->flags & CHAN_EOF_SENT) &&
1074: (c->extended_usage == CHAN_EXTENDED_READ ||
1075: c->extended_usage == CHAN_EXTENDED_IGNORE) &&
1.367 djm 1076: sshbuf_len(c->extended) < c->remote_window)
1.44 markus 1077: FD_SET(c->efd, readset);
1078: }
1.204 djm 1079: /* XXX: What about efd? races? */
1.44 markus 1080: }
1081:
1.41 markus 1082: /*
1083: * This is a special state for X11 authentication spoofing. An opened X11
1084: * connection (when authentication spoofing is being done) remains in this
1085: * state until the first packet has been completely read. The authentication
1086: * data in that packet is then substituted by the real data if it matches the
1087: * fake data, and the channel is put into normal mode.
1.51 markus 1088: * XXX All this happens at the client side.
1.121 markus 1089: * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
1.41 markus 1090: */
1.127 itojun 1091: static int
1.367 djm 1092: x11_open_helper(struct ssh *ssh, struct sshbuf *b)
1.1 deraadt 1093: {
1.367 djm 1094: struct ssh_channels *sc = ssh->chanctxt;
1.77 markus 1095: u_char *ucp;
1096: u_int proto_len, data_len;
1.25 markus 1097:
1.347 djm 1098: /* Is this being called after the refusal deadline? */
1.367 djm 1099: if (sc->x11_refuse_time != 0 &&
1100: (u_int)monotime() >= sc->x11_refuse_time) {
1.347 djm 1101: verbose("Rejected X11 connection after ForwardX11Timeout "
1102: "expired");
1103: return -1;
1104: }
1105:
1.41 markus 1106: /* Check if the fixed size part of the packet is in buffer. */
1.367 djm 1107: if (sshbuf_len(b) < 12)
1.41 markus 1108: return 0;
1109:
1110: /* Parse the lengths of variable-length fields. */
1.367 djm 1111: ucp = sshbuf_mutable_ptr(b);
1.41 markus 1112: if (ucp[0] == 0x42) { /* Byte order MSB first. */
1113: proto_len = 256 * ucp[6] + ucp[7];
1114: data_len = 256 * ucp[8] + ucp[9];
1115: } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
1116: proto_len = ucp[6] + 256 * ucp[7];
1117: data_len = ucp[8] + 256 * ucp[9];
1118: } else {
1.194 markus 1119: debug2("Initial X11 packet contains bad byte order byte: 0x%x",
1.148 deraadt 1120: ucp[0]);
1.41 markus 1121: return -1;
1122: }
1123:
1124: /* Check if the whole packet is in buffer. */
1.367 djm 1125: if (sshbuf_len(b) <
1.41 markus 1126: 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
1127: return 0;
1128:
1129: /* Check if authentication protocol matches. */
1.367 djm 1130: if (proto_len != strlen(sc->x11_saved_proto) ||
1131: memcmp(ucp + 12, sc->x11_saved_proto, proto_len) != 0) {
1.194 markus 1132: debug2("X11 connection uses different authentication protocol.");
1.41 markus 1133: return -1;
1134: }
1135: /* Check if authentication data matches our fake data. */
1.367 djm 1136: if (data_len != sc->x11_fake_data_len ||
1.308 djm 1137: timingsafe_bcmp(ucp + 12 + ((proto_len + 3) & ~3),
1.367 djm 1138: sc->x11_fake_data, sc->x11_fake_data_len) != 0) {
1.194 markus 1139: debug2("X11 auth data does not match fake data.");
1.41 markus 1140: return -1;
1141: }
1142: /* Check fake data length */
1.367 djm 1143: if (sc->x11_fake_data_len != sc->x11_saved_data_len) {
1.41 markus 1144: error("X11 fake_data_len %d != saved_data_len %d",
1.367 djm 1145: sc->x11_fake_data_len, sc->x11_saved_data_len);
1.41 markus 1146: return -1;
1147: }
1148: /*
1149: * Received authentication protocol and data match
1150: * our fake data. Substitute the fake data with real
1151: * data.
1152: */
1153: memcpy(ucp + 12 + ((proto_len + 3) & ~3),
1.367 djm 1154: sc->x11_saved_data, sc->x11_saved_data_len);
1.41 markus 1155: return 1;
1156: }
1157:
1.127 itojun 1158: static void
1.367 djm 1159: channel_pre_x11_open(struct ssh *ssh, Channel *c,
1160: fd_set *readset, fd_set *writeset)
1.41 markus 1161: {
1.367 djm 1162: int ret = x11_open_helper(ssh, c->output);
1.133 markus 1163:
1164: /* c->force_drain = 1; */
1165:
1.41 markus 1166: if (ret == 1) {
1167: c->type = SSH_CHANNEL_OPEN;
1.367 djm 1168: channel_pre_open(ssh, c, readset, writeset);
1.41 markus 1169: } else if (ret == -1) {
1.188 itojun 1170: logit("X11 connection rejected because of wrong authentication.");
1.367 djm 1171: debug2("X11 rejected %d i%d/o%d",
1172: c->self, c->istate, c->ostate);
1173: chan_read_failed(ssh, c);
1174: sshbuf_reset(c->input);
1175: chan_ibuf_empty(ssh, c);
1176: sshbuf_reset(c->output);
1177: chan_write_failed(ssh, c);
1.194 markus 1178: debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
1.41 markus 1179: }
1180: }
1.25 markus 1181:
1.302 djm 1182: static void
1.367 djm 1183: channel_pre_mux_client(struct ssh *ssh,
1184: Channel *c, fd_set *readset, fd_set *writeset)
1.302 djm 1185: {
1.304 djm 1186: if (c->istate == CHAN_INPUT_OPEN && !c->mux_pause &&
1.367 djm 1187: sshbuf_check_reserve(c->input, CHAN_RBUF) == 0)
1.302 djm 1188: FD_SET(c->rfd, readset);
1189: if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
1190: /* clear buffer immediately (discard any partial packet) */
1.367 djm 1191: sshbuf_reset(c->input);
1192: chan_ibuf_empty(ssh, c);
1.302 djm 1193: /* Start output drain. XXX just kill chan? */
1.367 djm 1194: chan_rcvd_oclose(ssh, c);
1.302 djm 1195: }
1196: if (c->ostate == CHAN_OUTPUT_OPEN ||
1197: c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
1.367 djm 1198: if (sshbuf_len(c->output) > 0)
1.302 djm 1199: FD_SET(c->wfd, writeset);
1200: else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN)
1.367 djm 1201: chan_obuf_empty(ssh, c);
1.302 djm 1202: }
1203: }
1204:
1.104 markus 1205: /* try to decode a socks4 header */
1.127 itojun 1206: static int
1.372 markus 1207: channel_decode_socks4(Channel *c, struct sshbuf *input, struct sshbuf *output)
1.103 markus 1208: {
1.367 djm 1209: const u_char *p;
1210: char *host;
1.292 djm 1211: u_int len, have, i, found, need;
1.148 deraadt 1212: char username[256];
1.103 markus 1213: struct {
1214: u_int8_t version;
1215: u_int8_t command;
1216: u_int16_t dest_port;
1.104 markus 1217: struct in_addr dest_addr;
1.103 markus 1218: } s4_req, s4_rsp;
1.367 djm 1219: int r;
1.103 markus 1220:
1.104 markus 1221: debug2("channel %d: decode socks4", c->self);
1.109 markus 1222:
1.372 markus 1223: have = sshbuf_len(input);
1.109 markus 1224: len = sizeof(s4_req);
1225: if (have < len)
1226: return 0;
1.372 markus 1227: p = sshbuf_ptr(input);
1.292 djm 1228:
1229: need = 1;
1230: /* SOCKS4A uses an invalid IP address 0.0.0.x */
1231: if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) {
1232: debug2("channel %d: socks4a request", c->self);
1233: /* ... and needs an extra string (the hostname) */
1234: need = 2;
1235: }
1236: /* Check for terminating NUL on the string(s) */
1.109 markus 1237: for (found = 0, i = len; i < have; i++) {
1238: if (p[i] == '\0') {
1.292 djm 1239: found++;
1240: if (found == need)
1241: break;
1.109 markus 1242: }
1243: if (i > 1024) {
1244: /* the peer is probably sending garbage */
1245: debug("channel %d: decode socks4: too long",
1246: c->self);
1247: return -1;
1248: }
1249: }
1.292 djm 1250: if (found < need)
1.109 markus 1251: return 0;
1.372 markus 1252: if ((r = sshbuf_get(input, &s4_req.version, 1)) != 0 ||
1253: (r = sshbuf_get(input, &s4_req.command, 1)) != 0 ||
1254: (r = sshbuf_get(input, &s4_req.dest_port, 2)) != 0 ||
1255: (r = sshbuf_get(input, &s4_req.dest_addr, 4)) != 0) {
1.367 djm 1256: debug("channels %d: decode socks4: %s", c->self, ssh_err(r));
1257: return -1;
1258: }
1.372 markus 1259: have = sshbuf_len(input);
1260: p = sshbuf_ptr(input);
1.364 djm 1261: if (memchr(p, '\0', have) == NULL) {
1262: error("channel %d: decode socks4: user not nul terminated",
1.331 djm 1263: c->self);
1.364 djm 1264: return -1;
1265: }
1.103 markus 1266: len = strlen(p);
1.106 markus 1267: debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
1.367 djm 1268: len++; /* trailing '\0' */
1.103 markus 1269: strlcpy(username, p, sizeof(username));
1.372 markus 1270: if ((r = sshbuf_consume(input, len)) != 0) {
1.367 djm 1271: fatal("%s: channel %d: consume: %s", __func__,
1272: c->self, ssh_err(r));
1273: }
1.321 djm 1274: free(c->path);
1275: c->path = NULL;
1.292 djm 1276: if (need == 1) { /* SOCKS4: one string */
1277: host = inet_ntoa(s4_req.dest_addr);
1.293 djm 1278: c->path = xstrdup(host);
1.292 djm 1279: } else { /* SOCKS4A: two strings */
1.372 markus 1280: have = sshbuf_len(input);
1281: p = sshbuf_ptr(input);
1.364 djm 1282: if (memchr(p, '\0', have) == NULL) {
1283: error("channel %d: decode socks4a: host not nul "
1284: "terminated", c->self);
1285: return -1;
1286: }
1.292 djm 1287: len = strlen(p);
1288: debug2("channel %d: decode socks4a: host %s/%d",
1289: c->self, p, len);
1290: len++; /* trailing '\0' */
1.293 djm 1291: if (len > NI_MAXHOST) {
1.292 djm 1292: error("channel %d: hostname \"%.100s\" too long",
1293: c->self, p);
1294: return -1;
1295: }
1.293 djm 1296: c->path = xstrdup(p);
1.372 markus 1297: if ((r = sshbuf_consume(input, len)) != 0) {
1.367 djm 1298: fatal("%s: channel %d: consume: %s", __func__,
1299: c->self, ssh_err(r));
1300: }
1.292 djm 1301: }
1.103 markus 1302: c->host_port = ntohs(s4_req.dest_port);
1.148 deraadt 1303:
1.194 markus 1304: debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
1.292 djm 1305: c->self, c->path, c->host_port, s4_req.command);
1.103 markus 1306:
1.104 markus 1307: if (s4_req.command != 1) {
1.292 djm 1308: debug("channel %d: cannot handle: %s cn %d",
1309: c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command);
1.104 markus 1310: return -1;
1.103 markus 1311: }
1.104 markus 1312: s4_rsp.version = 0; /* vn: 0 for reply */
1313: s4_rsp.command = 90; /* cd: req granted */
1.103 markus 1314: s4_rsp.dest_port = 0; /* ignored */
1.104 markus 1315: s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
1.372 markus 1316: if ((r = sshbuf_put(output, &s4_rsp, sizeof(s4_rsp))) != 0) {
1.367 djm 1317: fatal("%s: channel %d: append reply: %s", __func__,
1318: c->self, ssh_err(r));
1319: }
1.104 markus 1320: return 1;
1321: }
1322:
1.193 markus 1323: /* try to decode a socks5 header */
1324: #define SSH_SOCKS5_AUTHDONE 0x1000
1325: #define SSH_SOCKS5_NOAUTH 0x00
1326: #define SSH_SOCKS5_IPV4 0x01
1327: #define SSH_SOCKS5_DOMAIN 0x03
1328: #define SSH_SOCKS5_IPV6 0x04
1329: #define SSH_SOCKS5_CONNECT 0x01
1330: #define SSH_SOCKS5_SUCCESS 0x00
1331:
1332: static int
1.372 markus 1333: channel_decode_socks5(Channel *c, struct sshbuf *input, struct sshbuf *output)
1.193 markus 1334: {
1.367 djm 1335: /* XXX use get/put_u8 instead of trusting struct padding */
1.193 markus 1336: struct {
1337: u_int8_t version;
1338: u_int8_t command;
1339: u_int8_t reserved;
1340: u_int8_t atyp;
1341: } s5_req, s5_rsp;
1342: u_int16_t dest_port;
1.324 djm 1343: char dest_addr[255+1], ntop[INET6_ADDRSTRLEN];
1.367 djm 1344: const u_char *p;
1.252 djm 1345: u_int have, need, i, found, nmethods, addrlen, af;
1.367 djm 1346: int r;
1.193 markus 1347:
1348: debug2("channel %d: decode socks5", c->self);
1.372 markus 1349: p = sshbuf_ptr(input);
1.193 markus 1350: if (p[0] != 0x05)
1351: return -1;
1.372 markus 1352: have = sshbuf_len(input);
1.193 markus 1353: if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
1354: /* format: ver | nmethods | methods */
1.198 djm 1355: if (have < 2)
1.193 markus 1356: return 0;
1357: nmethods = p[1];
1358: if (have < nmethods + 2)
1359: return 0;
1360: /* look for method: "NO AUTHENTICATION REQUIRED" */
1.268 stevesk 1361: for (found = 0, i = 2; i < nmethods + 2; i++) {
1.264 stevesk 1362: if (p[i] == SSH_SOCKS5_NOAUTH) {
1.193 markus 1363: found = 1;
1364: break;
1365: }
1366: }
1367: if (!found) {
1368: debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
1369: c->self);
1370: return -1;
1371: }
1.372 markus 1372: if ((r = sshbuf_consume(input, nmethods + 2)) != 0) {
1.367 djm 1373: fatal("%s: channel %d: consume: %s", __func__,
1374: c->self, ssh_err(r));
1375: }
1376: /* version, method */
1.372 markus 1377: if ((r = sshbuf_put_u8(output, 0x05)) != 0 ||
1378: (r = sshbuf_put_u8(output, SSH_SOCKS5_NOAUTH)) != 0) {
1.367 djm 1379: fatal("%s: channel %d: append reply: %s", __func__,
1380: c->self, ssh_err(r));
1381: }
1.193 markus 1382: c->flags |= SSH_SOCKS5_AUTHDONE;
1383: debug2("channel %d: socks5 auth done", c->self);
1384: return 0; /* need more */
1385: }
1386: debug2("channel %d: socks5 post auth", c->self);
1387: if (have < sizeof(s5_req)+1)
1388: return 0; /* need more */
1.247 deraadt 1389: memcpy(&s5_req, p, sizeof(s5_req));
1.193 markus 1390: if (s5_req.version != 0x05 ||
1391: s5_req.command != SSH_SOCKS5_CONNECT ||
1392: s5_req.reserved != 0x00) {
1.194 markus 1393: debug2("channel %d: only socks5 connect supported", c->self);
1.193 markus 1394: return -1;
1395: }
1.213 deraadt 1396: switch (s5_req.atyp){
1.193 markus 1397: case SSH_SOCKS5_IPV4:
1398: addrlen = 4;
1399: af = AF_INET;
1400: break;
1401: case SSH_SOCKS5_DOMAIN:
1402: addrlen = p[sizeof(s5_req)];
1403: af = -1;
1404: break;
1405: case SSH_SOCKS5_IPV6:
1406: addrlen = 16;
1407: af = AF_INET6;
1408: break;
1409: default:
1.194 markus 1410: debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
1.193 markus 1411: return -1;
1412: }
1.252 djm 1413: need = sizeof(s5_req) + addrlen + 2;
1414: if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1415: need++;
1416: if (have < need)
1.193 markus 1417: return 0;
1.372 markus 1418: if ((r = sshbuf_consume(input, sizeof(s5_req))) != 0) {
1.367 djm 1419: fatal("%s: channel %d: consume: %s", __func__,
1420: c->self, ssh_err(r));
1421: }
1422: if (s5_req.atyp == SSH_SOCKS5_DOMAIN) {
1423: /* host string length */
1.372 markus 1424: if ((r = sshbuf_consume(input, 1)) != 0) {
1.367 djm 1425: fatal("%s: channel %d: consume: %s", __func__,
1426: c->self, ssh_err(r));
1427: }
1428: }
1.372 markus 1429: if ((r = sshbuf_get(input, &dest_addr, addrlen)) != 0 ||
1430: (r = sshbuf_get(input, &dest_port, 2)) != 0) {
1.367 djm 1431: debug("channel %d: parse addr/port: %s", c->self, ssh_err(r));
1432: return -1;
1433: }
1.193 markus 1434: dest_addr[addrlen] = '\0';
1.321 djm 1435: free(c->path);
1436: c->path = NULL;
1.293 djm 1437: if (s5_req.atyp == SSH_SOCKS5_DOMAIN) {
1.294 djm 1438: if (addrlen >= NI_MAXHOST) {
1.293 djm 1439: error("channel %d: dynamic request: socks5 hostname "
1440: "\"%.100s\" too long", c->self, dest_addr);
1441: return -1;
1442: }
1443: c->path = xstrdup(dest_addr);
1444: } else {
1445: if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL)
1446: return -1;
1447: c->path = xstrdup(ntop);
1448: }
1.193 markus 1449: c->host_port = ntohs(dest_port);
1.198 djm 1450:
1.194 markus 1451: debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
1.193 markus 1452: c->self, c->path, c->host_port, s5_req.command);
1453:
1454: s5_rsp.version = 0x05;
1455: s5_rsp.command = SSH_SOCKS5_SUCCESS;
1456: s5_rsp.reserved = 0; /* ignored */
1457: s5_rsp.atyp = SSH_SOCKS5_IPV4;
1458: dest_port = 0; /* ignored */
1459:
1.372 markus 1460: if ((r = sshbuf_put(output, &s5_rsp, sizeof(s5_rsp))) != 0 ||
1461: (r = sshbuf_put_u32(output, ntohl(INADDR_ANY))) != 0 ||
1462: (r = sshbuf_put(output, &dest_port, sizeof(dest_port))) != 0)
1.367 djm 1463: fatal("%s: channel %d: append reply: %s", __func__,
1464: c->self, ssh_err(r));
1.193 markus 1465: return 1;
1.301 dtucker 1466: }
1467:
1468: Channel *
1.367 djm 1469: channel_connect_stdio_fwd(struct ssh *ssh,
1470: const char *host_to_connect, u_short port_to_connect, int in, int out)
1.301 dtucker 1471: {
1472: Channel *c;
1473:
1.367 djm 1474: debug("%s %s:%d", __func__, host_to_connect, port_to_connect);
1.301 dtucker 1475:
1.367 djm 1476: c = channel_new(ssh, "stdio-forward", SSH_CHANNEL_OPENING, in, out,
1.301 dtucker 1477: -1, CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1478: 0, "stdio-forward", /*nonblock*/0);
1479:
1480: c->path = xstrdup(host_to_connect);
1481: c->host_port = port_to_connect;
1482: c->listening_port = 0;
1483: c->force_drain = 1;
1484:
1.367 djm 1485: channel_register_fds(ssh, c, in, out, -1, 0, 1, 0);
1486: port_open_helper(ssh, c, "direct-tcpip");
1.301 dtucker 1487:
1488: return c;
1.193 markus 1489: }
1490:
1.104 markus 1491: /* dynamic port forwarding */
1.127 itojun 1492: static void
1.367 djm 1493: channel_pre_dynamic(struct ssh *ssh, Channel *c,
1494: fd_set *readset, fd_set *writeset)
1.104 markus 1495: {
1.367 djm 1496: const u_char *p;
1.217 djm 1497: u_int have;
1498: int ret;
1.103 markus 1499:
1.367 djm 1500: have = sshbuf_len(c->input);
1.104 markus 1501: debug2("channel %d: pre_dynamic: have %d", c->self, have);
1.367 djm 1502: /* sshbuf_dump(c->input, stderr); */
1.104 markus 1503: /* check if the fixed size part of the packet is in buffer. */
1.193 markus 1504: if (have < 3) {
1.104 markus 1505: /* need more */
1506: FD_SET(c->sock, readset);
1507: return;
1508: }
1509: /* try to guess the protocol */
1.367 djm 1510: p = sshbuf_ptr(c->input);
1511: /* XXX sshbuf_peek_u8? */
1.104 markus 1512: switch (p[0]) {
1513: case 0x04:
1.372 markus 1514: ret = channel_decode_socks4(c, c->input, c->output);
1.193 markus 1515: break;
1516: case 0x05:
1.372 markus 1517: ret = channel_decode_socks5(c, c->input, c->output);
1.104 markus 1518: break;
1519: default:
1520: ret = -1;
1521: break;
1522: }
1523: if (ret < 0) {
1.367 djm 1524: chan_mark_dead(ssh, c);
1.104 markus 1525: } else if (ret == 0) {
1526: debug2("channel %d: pre_dynamic: need more", c->self);
1527: /* need more */
1528: FD_SET(c->sock, readset);
1.372 markus 1529: if (sshbuf_len(c->output))
1530: FD_SET(c->sock, writeset);
1.104 markus 1531: } else {
1532: /* switch to the next state */
1533: c->type = SSH_CHANNEL_OPENING;
1.367 djm 1534: port_open_helper(ssh, c, "direct-tcpip");
1.104 markus 1535: }
1.103 markus 1536: }
1537:
1.372 markus 1538: /* simulate read-error */
1539: static void
1540: rdynamic_close(struct ssh *ssh, Channel *c)
1541: {
1542: c->type = SSH_CHANNEL_OPEN;
1543: chan_read_failed(ssh, c);
1544: sshbuf_reset(c->input);
1545: chan_ibuf_empty(ssh, c);
1546: sshbuf_reset(c->output);
1547: chan_write_failed(ssh, c);
1548: }
1549:
1550: /* reverse dynamic port forwarding */
1551: static void
1552: channel_before_prepare_select_rdynamic(struct ssh *ssh, Channel *c)
1553: {
1554: const u_char *p;
1555: u_int have, len;
1556: int r, ret;
1557:
1558: have = sshbuf_len(c->output);
1559: debug2("channel %d: pre_rdynamic: have %d", c->self, have);
1560: /* sshbuf_dump(c->output, stderr); */
1561: /* EOF received */
1562: if (c->flags & CHAN_EOF_RCVD) {
1563: if ((r = sshbuf_consume(c->output, have)) != 0) {
1564: fatal("%s: channel %d: consume: %s",
1565: __func__, c->self, ssh_err(r));
1566: }
1567: rdynamic_close(ssh, c);
1568: return;
1569: }
1570: /* check if the fixed size part of the packet is in buffer. */
1571: if (have < 3)
1572: return;
1573: /* try to guess the protocol */
1574: p = sshbuf_ptr(c->output);
1575: switch (p[0]) {
1576: case 0x04:
1577: /* switch input/output for reverse forwarding */
1578: ret = channel_decode_socks4(c, c->output, c->input);
1579: break;
1580: case 0x05:
1581: ret = channel_decode_socks5(c, c->output, c->input);
1582: break;
1583: default:
1584: ret = -1;
1585: break;
1586: }
1587: if (ret < 0) {
1588: rdynamic_close(ssh, c);
1589: } else if (ret == 0) {
1590: debug2("channel %d: pre_rdynamic: need more", c->self);
1591: /* send socks request to peer */
1592: len = sshbuf_len(c->input);
1593: if (len > 0 && len < c->remote_window) {
1594: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_DATA)) != 0 ||
1595: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1596: (r = sshpkt_put_stringb(ssh, c->input)) != 0 ||
1597: (r = sshpkt_send(ssh)) != 0) {
1598: fatal("%s: channel %i: rdynamic: %s", __func__,
1599: c->self, ssh_err(r));
1600: }
1601: if ((r = sshbuf_consume(c->input, len)) != 0) {
1602: fatal("%s: channel %d: consume: %s",
1603: __func__, c->self, ssh_err(r));
1604: }
1605: c->remote_window -= len;
1606: }
1607: } else if (rdynamic_connect_finish(ssh, c) < 0) {
1608: /* the connect failed */
1609: rdynamic_close(ssh, c);
1610: }
1611: }
1612:
1.41 markus 1613: /* This is our fake X11 server socket. */
1.127 itojun 1614: static void
1.367 djm 1615: channel_post_x11_listener(struct ssh *ssh, Channel *c,
1616: fd_set *readset, fd_set *writeset)
1.41 markus 1617: {
1.113 markus 1618: Channel *nc;
1.285 djm 1619: struct sockaddr_storage addr;
1.367 djm 1620: int r, newsock, oerrno, remote_port;
1.41 markus 1621: socklen_t addrlen;
1.85 markus 1622: char buf[16384], *remote_ipaddr;
1.25 markus 1623:
1.367 djm 1624: if (!FD_ISSET(c->sock, readset))
1625: return;
1626:
1627: debug("X11 connection requested.");
1628: addrlen = sizeof(addr);
1629: newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
1630: if (c->single_connection) {
1631: oerrno = errno;
1632: debug2("single_connection: closing X11 listener.");
1633: channel_close_fd(ssh, &c->sock);
1634: chan_mark_dead(ssh, c);
1635: errno = oerrno;
1636: }
1637: if (newsock < 0) {
1638: if (errno != EINTR && errno != EWOULDBLOCK &&
1639: errno != ECONNABORTED)
1640: error("accept: %.100s", strerror(errno));
1641: if (errno == EMFILE || errno == ENFILE)
1642: c->notbefore = monotime() + 1;
1643: return;
1644: }
1645: set_nodelay(newsock);
1646: remote_ipaddr = get_peer_ipaddr(newsock);
1647: remote_port = get_peer_port(newsock);
1648: snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
1649: remote_ipaddr, remote_port);
1650:
1651: nc = channel_new(ssh, "accepted x11 socket",
1652: SSH_CHANNEL_OPENING, newsock, newsock, -1,
1653: c->local_window_max, c->local_maxpacket, 0, buf, 1);
1654: open_preamble(ssh, __func__, nc, "x11");
1.378 djm 1655: if ((r = sshpkt_put_cstring(ssh, remote_ipaddr)) != 0 ||
1656: (r = sshpkt_put_u32(ssh, remote_port)) != 0) {
1.367 djm 1657: fatal("%s: channel %i: reply %s", __func__,
1658: c->self, ssh_err(r));
1.41 markus 1659: }
1.367 djm 1660: if ((r = sshpkt_send(ssh)) != 0)
1661: fatal("%s: channel %i: send %s", __func__, c->self, ssh_err(r));
1662: free(remote_ipaddr);
1.41 markus 1663: }
1.25 markus 1664:
1.127 itojun 1665: static void
1.367 djm 1666: port_open_helper(struct ssh *ssh, Channel *c, char *rtype)
1.103 markus 1667: {
1.328 djm 1668: char *local_ipaddr = get_local_ipaddr(c->sock);
1.350 djm 1669: int local_port = c->sock == -1 ? 65536 : get_local_port(c->sock);
1.103 markus 1670: char *remote_ipaddr = get_peer_ipaddr(c->sock);
1.216 markus 1671: int remote_port = get_peer_port(c->sock);
1.367 djm 1672: int r;
1.303 djm 1673:
1674: if (remote_port == -1) {
1675: /* Fake addr/port to appease peers that validate it (Tectia) */
1.321 djm 1676: free(remote_ipaddr);
1.303 djm 1677: remote_ipaddr = xstrdup("127.0.0.1");
1678: remote_port = 65535;
1679: }
1.103 markus 1680:
1.367 djm 1681: free(c->remote_name);
1682: xasprintf(&c->remote_name,
1.103 markus 1683: "%s: listening port %d for %.100s port %d, "
1.328 djm 1684: "connect from %.200s port %d to %.100s port %d",
1.103 markus 1685: rtype, c->listening_port, c->path, c->host_port,
1.328 djm 1686: remote_ipaddr, remote_port, local_ipaddr, local_port);
1.103 markus 1687:
1.367 djm 1688: open_preamble(ssh, __func__, c, rtype);
1.358 djm 1689: if (strcmp(rtype, "direct-tcpip") == 0) {
1690: /* target host, port */
1.367 djm 1691: if ((r = sshpkt_put_cstring(ssh, c->path)) != 0 ||
1692: (r = sshpkt_put_u32(ssh, c->host_port)) != 0) {
1693: fatal("%s: channel %i: reply %s", __func__,
1694: c->self, ssh_err(r));
1695: }
1.358 djm 1696: } else if (strcmp(rtype, "direct-streamlocal@openssh.com") == 0) {
1697: /* target path */
1.367 djm 1698: if ((r = sshpkt_put_cstring(ssh, c->path)) != 0) {
1699: fatal("%s: channel %i: reply %s", __func__,
1700: c->self, ssh_err(r));
1701: }
1.358 djm 1702: } else if (strcmp(rtype, "forwarded-streamlocal@openssh.com") == 0) {
1703: /* listen path */
1.367 djm 1704: if ((r = sshpkt_put_cstring(ssh, c->path)) != 0) {
1705: fatal("%s: channel %i: reply %s", __func__,
1706: c->self, ssh_err(r));
1707: }
1.103 markus 1708: } else {
1.358 djm 1709: /* listen address, port */
1.367 djm 1710: if ((r = sshpkt_put_cstring(ssh, c->path)) != 0 ||
1711: (r = sshpkt_put_u32(ssh, local_port)) != 0) {
1712: fatal("%s: channel %i: reply %s", __func__,
1713: c->self, ssh_err(r));
1714: }
1.358 djm 1715: }
1716: if (strcmp(rtype, "forwarded-streamlocal@openssh.com") == 0) {
1717: /* reserved for future owner/mode info */
1.367 djm 1718: if ((r = sshpkt_put_cstring(ssh, "")) != 0) {
1719: fatal("%s: channel %i: reply %s", __func__,
1720: c->self, ssh_err(r));
1721: }
1.358 djm 1722: } else {
1723: /* originator host and port */
1.367 djm 1724: if ((r = sshpkt_put_cstring(ssh, remote_ipaddr)) != 0 ||
1725: (r = sshpkt_put_u32(ssh, (u_int)remote_port)) != 0) {
1726: fatal("%s: channel %i: reply %s", __func__,
1727: c->self, ssh_err(r));
1728: }
1.103 markus 1729: }
1.367 djm 1730: if ((r = sshpkt_send(ssh)) != 0)
1731: fatal("%s: channel %i: send %s", __func__, c->self, ssh_err(r));
1.321 djm 1732: free(remote_ipaddr);
1.328 djm 1733: free(local_ipaddr);
1.103 markus 1734: }
1735:
1.347 djm 1736: void
1.367 djm 1737: channel_set_x11_refuse_time(struct ssh *ssh, u_int refuse_time)
1.347 djm 1738: {
1.367 djm 1739: ssh->chanctxt->x11_refuse_time = refuse_time;
1.226 djm 1740: }
1741:
1.41 markus 1742: /*
1743: * This socket is listening for connections to a forwarded TCP/IP port.
1744: */
1.127 itojun 1745: static void
1.367 djm 1746: channel_post_port_listener(struct ssh *ssh, Channel *c,
1747: fd_set *readset, fd_set *writeset)
1.41 markus 1748: {
1.103 markus 1749: Channel *nc;
1.285 djm 1750: struct sockaddr_storage addr;
1.113 markus 1751: int newsock, nextstate;
1.41 markus 1752: socklen_t addrlen;
1.103 markus 1753: char *rtype;
1.73 markus 1754:
1.367 djm 1755: if (!FD_ISSET(c->sock, readset))
1756: return;
1757:
1758: debug("Connection to port %d forwarding to %.100s port %d requested.",
1759: c->listening_port, c->path, c->host_port);
1.103 markus 1760:
1.367 djm 1761: if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1762: nextstate = SSH_CHANNEL_OPENING;
1763: rtype = "forwarded-tcpip";
1764: } else if (c->type == SSH_CHANNEL_RUNIX_LISTENER) {
1765: nextstate = SSH_CHANNEL_OPENING;
1766: rtype = "forwarded-streamlocal@openssh.com";
1767: } else if (c->host_port == PORT_STREAMLOCAL) {
1768: nextstate = SSH_CHANNEL_OPENING;
1769: rtype = "direct-streamlocal@openssh.com";
1770: } else if (c->host_port == 0) {
1771: nextstate = SSH_CHANNEL_DYNAMIC;
1772: rtype = "dynamic-tcpip";
1773: } else {
1774: nextstate = SSH_CHANNEL_OPENING;
1775: rtype = "direct-tcpip";
1776: }
1.103 markus 1777:
1.367 djm 1778: addrlen = sizeof(addr);
1779: newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
1780: if (newsock < 0) {
1781: if (errno != EINTR && errno != EWOULDBLOCK &&
1782: errno != ECONNABORTED)
1783: error("accept: %.100s", strerror(errno));
1784: if (errno == EMFILE || errno == ENFILE)
1785: c->notbefore = monotime() + 1;
1786: return;
1.41 markus 1787: }
1.367 djm 1788: if (c->host_port != PORT_STREAMLOCAL)
1789: set_nodelay(newsock);
1790: nc = channel_new(ssh, rtype, nextstate, newsock, newsock, -1,
1791: c->local_window_max, c->local_maxpacket, 0, rtype, 1);
1792: nc->listening_port = c->listening_port;
1793: nc->host_port = c->host_port;
1794: if (c->path != NULL)
1795: nc->path = xstrdup(c->path);
1796:
1797: if (nextstate != SSH_CHANNEL_DYNAMIC)
1798: port_open_helper(ssh, nc, rtype);
1.41 markus 1799: }
1.25 markus 1800:
1.41 markus 1801: /*
1802: * This is the authentication agent socket listening for connections from
1803: * clients.
1804: */
1.127 itojun 1805: static void
1.367 djm 1806: channel_post_auth_listener(struct ssh *ssh, Channel *c,
1807: fd_set *readset, fd_set *writeset)
1.41 markus 1808: {
1.113 markus 1809: Channel *nc;
1.367 djm 1810: int r, newsock;
1.285 djm 1811: struct sockaddr_storage addr;
1.41 markus 1812: socklen_t addrlen;
1.25 markus 1813:
1.367 djm 1814: if (!FD_ISSET(c->sock, readset))
1815: return;
1816:
1817: addrlen = sizeof(addr);
1818: newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
1819: if (newsock < 0) {
1820: error("accept from auth socket: %.100s", strerror(errno));
1821: if (errno == EMFILE || errno == ENFILE)
1822: c->notbefore = monotime() + 1;
1823: return;
1.41 markus 1824: }
1.367 djm 1825: nc = channel_new(ssh, "accepted auth socket",
1826: SSH_CHANNEL_OPENING, newsock, newsock, -1,
1827: c->local_window_max, c->local_maxpacket,
1828: 0, "accepted auth socket", 1);
1829: open_preamble(ssh, __func__, nc, "auth-agent@openssh.com");
1830: if ((r = sshpkt_send(ssh)) != 0)
1831: fatal("%s: channel %i: %s", __func__, c->self, ssh_err(r));
1.41 markus 1832: }
1.25 markus 1833:
1.127 itojun 1834: static void
1.367 djm 1835: channel_post_connecting(struct ssh *ssh, Channel *c,
1836: fd_set *readset, fd_set *writeset)
1.75 markus 1837: {
1.372 markus 1838: int err = 0, sock, isopen, r;
1.129 stevesk 1839: socklen_t sz = sizeof(err);
1.114 markus 1840:
1.367 djm 1841: if (!FD_ISSET(c->sock, writeset))
1842: return;
1.368 djm 1843: if (!c->have_remote_id)
1844: fatal(":%s: channel %d: no remote id", __func__, c->self);
1.372 markus 1845: /* for rdynamic the OPEN_CONFIRMATION has been sent already */
1846: isopen = (c->type == SSH_CHANNEL_RDYNAMIC_FINISH);
1.367 djm 1847: if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
1848: err = errno;
1849: error("getsockopt SO_ERROR failed");
1850: }
1851: if (err == 0) {
1852: debug("channel %d: connected to %s port %d",
1853: c->self, c->connect_ctx.host, c->connect_ctx.port);
1854: channel_connect_ctx_free(&c->connect_ctx);
1855: c->type = SSH_CHANNEL_OPEN;
1.372 markus 1856: if (isopen) {
1857: /* no message necessary */
1858: } else {
1859: if ((r = sshpkt_start(ssh,
1860: SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
1861: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1862: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
1863: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
1864: (r = sshpkt_put_u32(ssh, c->local_maxpacket))
1865: != 0)
1866: fatal("%s: channel %i: confirm: %s", __func__,
1867: c->self, ssh_err(r));
1868: if ((r = sshpkt_send(ssh)) != 0)
1869: fatal("%s: channel %i: %s", __func__, c->self,
1870: ssh_err(r));
1.367 djm 1871: }
1872: } else {
1873: debug("channel %d: connection failed: %s",
1874: c->self, strerror(err));
1875: /* Try next address, if any */
1876: if ((sock = connect_next(&c->connect_ctx)) > 0) {
1877: close(c->sock);
1878: c->sock = c->rfd = c->wfd = sock;
1879: channel_find_maxfd(ssh->chanctxt);
1880: return;
1881: }
1882: /* Exhausted all addresses */
1883: error("connect_to %.100s port %d: failed.",
1884: c->connect_ctx.host, c->connect_ctx.port);
1885: channel_connect_ctx_free(&c->connect_ctx);
1.372 markus 1886: if (isopen) {
1887: rdynamic_close(ssh, c);
1888: } else {
1889: if ((r = sshpkt_start(ssh,
1890: SSH2_MSG_CHANNEL_OPEN_FAILURE)) != 0 ||
1891: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1.378 djm 1892: (r = sshpkt_put_u32(ssh,
1893: SSH2_OPEN_CONNECT_FAILED)) != 0 ||
1894: (r = sshpkt_put_cstring(ssh, strerror(err))) != 0 ||
1895: (r = sshpkt_put_cstring(ssh, "")) != 0) {
1.372 markus 1896: fatal("%s: channel %i: failure: %s", __func__,
1897: c->self, ssh_err(r));
1.378 djm 1898: }
1.372 markus 1899: if ((r = sshpkt_send(ssh)) != 0)
1900: fatal("%s: channel %i: %s", __func__, c->self,
1901: ssh_err(r));
1902: chan_mark_dead(ssh, c);
1.75 markus 1903: }
1904: }
1905: }
1906:
1.127 itojun 1907: static int
1.367 djm 1908: channel_handle_rfd(struct ssh *ssh, Channel *c,
1909: fd_set *readset, fd_set *writeset)
1.41 markus 1910: {
1.214 markus 1911: char buf[CHAN_RBUF];
1.367 djm 1912: ssize_t len;
1913: int r;
1.25 markus 1914:
1.367 djm 1915: if (c->rfd == -1 || !FD_ISSET(c->rfd, readset))
1916: return 1;
1917:
1918: len = read(c->rfd, buf, sizeof(buf));
1919: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1920: return 1;
1921: if (len <= 0) {
1922: debug2("channel %d: read<=0 rfd %d len %zd",
1923: c->self, c->rfd, len);
1924: if (c->type != SSH_CHANNEL_OPEN) {
1925: debug2("channel %d: not open", c->self);
1926: chan_mark_dead(ssh, c);
1.41 markus 1927: return -1;
1.65 markus 1928: } else {
1.367 djm 1929: chan_read_failed(ssh, c);
1.65 markus 1930: }
1.367 djm 1931: return -1;
1932: }
1933: if (c->input_filter != NULL) {
1934: if (c->input_filter(ssh, c, buf, len) == -1) {
1935: debug2("channel %d: filter stops", c->self);
1936: chan_read_failed(ssh, c);
1937: }
1938: } else if (c->datagram) {
1939: if ((r = sshbuf_put_string(c->input, buf, len)) != 0)
1940: fatal("%s: channel %d: put datagram: %s", __func__,
1941: c->self, ssh_err(r));
1942: } else if ((r = sshbuf_put(c->input, buf, len)) != 0) {
1943: fatal("%s: channel %d: put data: %s", __func__,
1944: c->self, ssh_err(r));
1.41 markus 1945: }
1946: return 1;
1947: }
1.241 deraadt 1948:
1.127 itojun 1949: static int
1.367 djm 1950: channel_handle_wfd(struct ssh *ssh, Channel *c,
1951: fd_set *readset, fd_set *writeset)
1.41 markus 1952: {
1.95 markus 1953: struct termios tio;
1.367 djm 1954: u_char *data = NULL, *buf; /* XXX const; need filter API change */
1955: size_t dlen, olen = 0;
1956: int r, len;
1957:
1958: if (c->wfd == -1 || !FD_ISSET(c->wfd, writeset) ||
1959: sshbuf_len(c->output) == 0)
1960: return 1;
1.25 markus 1961:
1.41 markus 1962: /* Send buffered output data to the socket. */
1.367 djm 1963: olen = sshbuf_len(c->output);
1964: if (c->output_filter != NULL) {
1965: if ((buf = c->output_filter(ssh, c, &data, &dlen)) == NULL) {
1966: debug2("channel %d: filter stops", c->self);
1967: if (c->type != SSH_CHANNEL_OPEN)
1968: chan_mark_dead(ssh, c);
1969: else
1970: chan_write_failed(ssh, c);
1971: return -1;
1.231 reyk 1972: }
1.367 djm 1973: } else if (c->datagram) {
1974: if ((r = sshbuf_get_string(c->output, &data, &dlen)) != 0)
1975: fatal("%s: channel %d: get datagram: %s", __func__,
1976: c->self, ssh_err(r));
1.369 djm 1977: buf = data;
1.367 djm 1978: } else {
1979: buf = data = sshbuf_mutable_ptr(c->output);
1980: dlen = sshbuf_len(c->output);
1981: }
1.231 reyk 1982:
1.367 djm 1983: if (c->datagram) {
1984: /* ignore truncated writes, datagrams might get lost */
1.374 djm 1985: len = write(c->wfd, buf, dlen);
1.367 djm 1986: free(data);
1.53 markus 1987: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1988: return 1;
1.367 djm 1989: if (len <= 0)
1990: goto write_fail;
1991: goto out;
1992: }
1993:
1994: len = write(c->wfd, buf, dlen);
1995: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1996: return 1;
1997: if (len <= 0) {
1998: write_fail:
1999: if (c->type != SSH_CHANNEL_OPEN) {
2000: debug2("channel %d: not open", c->self);
2001: chan_mark_dead(ssh, c);
1.41 markus 2002: return -1;
1.367 djm 2003: } else {
2004: chan_write_failed(ssh, c);
1.91 markus 2005: }
1.367 djm 2006: return -1;
2007: }
2008: if (c->isatty && dlen >= 1 && buf[0] != '\r') {
2009: if (tcgetattr(c->wfd, &tio) == 0 &&
2010: !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
2011: /*
2012: * Simulate echo to reduce the impact of
2013: * traffic analysis. We need to match the
2014: * size of a SSH2_MSG_CHANNEL_DATA message
2015: * (4 byte channel id + buf)
2016: */
2017: if ((r = sshpkt_msg_ignore(ssh, 4+len)) != 0 ||
2018: (r = sshpkt_send(ssh)) != 0)
2019: fatal("%s: channel %d: ignore: %s",
2020: __func__, c->self, ssh_err(r));
1.25 markus 2021: }
1.367 djm 2022: }
2023: if ((r = sshbuf_consume(c->output, len)) != 0) {
2024: fatal("%s: channel %d: consume: %s",
2025: __func__, c->self, ssh_err(r));
1.44 markus 2026: }
1.309 djm 2027: out:
1.367 djm 2028: c->local_consumed += olen - sshbuf_len(c->output);
2029:
2030: return 1;
2031: }
2032:
2033: static int
2034: channel_handle_efd_write(struct ssh *ssh, Channel *c,
2035: fd_set *readset, fd_set *writeset)
2036: {
2037: int r;
2038: ssize_t len;
2039:
2040: if (!FD_ISSET(c->efd, writeset) || sshbuf_len(c->extended) == 0)
2041: return 1;
2042:
2043: len = write(c->efd, sshbuf_ptr(c->extended),
2044: sshbuf_len(c->extended));
2045: debug2("channel %d: written %zd to efd %d", c->self, len, c->efd);
2046: if (len < 0 && (errno == EINTR || errno == EAGAIN))
2047: return 1;
2048: if (len <= 0) {
2049: debug2("channel %d: closing write-efd %d", c->self, c->efd);
2050: channel_close_fd(ssh, &c->efd);
2051: } else {
2052: if ((r = sshbuf_consume(c->extended, len)) != 0) {
2053: fatal("%s: channel %d: consume: %s",
2054: __func__, c->self, ssh_err(r));
2055: }
2056: c->local_consumed += len;
2057: }
1.44 markus 2058: return 1;
2059: }
1.241 deraadt 2060:
1.127 itojun 2061: static int
1.367 djm 2062: channel_handle_efd_read(struct ssh *ssh, Channel *c,
2063: fd_set *readset, fd_set *writeset)
1.44 markus 2064: {
1.214 markus 2065: char buf[CHAN_RBUF];
1.367 djm 2066: int r;
2067: ssize_t len;
2068:
2069: if (!FD_ISSET(c->efd, readset))
2070: return 1;
1.44 markus 2071:
1.367 djm 2072: len = read(c->efd, buf, sizeof(buf));
2073: debug2("channel %d: read %zd from efd %d", c->self, len, c->efd);
2074: if (len < 0 && (errno == EINTR || errno == EAGAIN))
2075: return 1;
2076: if (len <= 0) {
2077: debug2("channel %d: closing read-efd %d",
2078: c->self, c->efd);
2079: channel_close_fd(ssh, &c->efd);
2080: } else {
2081: if (c->extended_usage == CHAN_EXTENDED_IGNORE) {
2082: debug3("channel %d: discard efd",
2083: c->self);
2084: } else if ((r = sshbuf_put(c->extended, buf, len)) != 0) {
2085: fatal("%s: channel %d: append: %s",
2086: __func__, c->self, ssh_err(r));
1.44 markus 2087: }
2088: }
2089: return 1;
2090: }
1.241 deraadt 2091:
1.127 itojun 2092: static int
1.367 djm 2093: channel_handle_efd(struct ssh *ssh, Channel *c,
2094: fd_set *readset, fd_set *writeset)
1.44 markus 2095: {
1.367 djm 2096: if (c->efd == -1)
2097: return 1;
2098:
2099: /** XXX handle drain efd, too */
2100:
2101: if (c->extended_usage == CHAN_EXTENDED_WRITE)
2102: return channel_handle_efd_write(ssh, c, readset, writeset);
2103: else if (c->extended_usage == CHAN_EXTENDED_READ ||
2104: c->extended_usage == CHAN_EXTENDED_IGNORE)
2105: return channel_handle_efd_read(ssh, c, readset, writeset);
2106:
2107: return 1;
2108: }
2109:
2110: static int
2111: channel_check_window(struct ssh *ssh, Channel *c)
2112: {
2113: int r;
2114:
1.104 markus 2115: if (c->type == SSH_CHANNEL_OPEN &&
2116: !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
1.270 dtucker 2117: ((c->local_window_max - c->local_window >
1.269 markus 2118: c->local_maxpacket*3) ||
2119: c->local_window < c->local_window_max/2) &&
1.44 markus 2120: c->local_consumed > 0) {
1.368 djm 2121: if (!c->have_remote_id)
2122: fatal(":%s: channel %d: no remote id",
2123: __func__, c->self);
1.367 djm 2124: if ((r = sshpkt_start(ssh,
2125: SSH2_MSG_CHANNEL_WINDOW_ADJUST)) != 0 ||
2126: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
2127: (r = sshpkt_put_u32(ssh, c->local_consumed)) != 0 ||
2128: (r = sshpkt_send(ssh)) != 0) {
2129: fatal("%s: channel %i: %s", __func__,
2130: c->self, ssh_err(r));
2131: }
1.70 markus 2132: debug2("channel %d: window %d sent adjust %d",
1.44 markus 2133: c->self, c->local_window,
2134: c->local_consumed);
2135: c->local_window += c->local_consumed;
2136: c->local_consumed = 0;
1.1 deraadt 2137: }
1.41 markus 2138: return 1;
1.1 deraadt 2139: }
2140:
1.127 itojun 2141: static void
1.367 djm 2142: channel_post_open(struct ssh *ssh, Channel *c,
2143: fd_set *readset, fd_set *writeset)
1.41 markus 2144: {
1.367 djm 2145: channel_handle_rfd(ssh, c, readset, writeset);
2146: channel_handle_wfd(ssh, c, readset, writeset);
2147: channel_handle_efd(ssh, c, readset, writeset);
2148: channel_check_window(ssh, c);
1.44 markus 2149: }
2150:
1.302 djm 2151: static u_int
1.367 djm 2152: read_mux(struct ssh *ssh, Channel *c, u_int need)
1.302 djm 2153: {
2154: char buf[CHAN_RBUF];
1.367 djm 2155: ssize_t len;
1.302 djm 2156: u_int rlen;
1.367 djm 2157: int r;
1.302 djm 2158:
1.367 djm 2159: if (sshbuf_len(c->input) < need) {
2160: rlen = need - sshbuf_len(c->input);
1.352 deraadt 2161: len = read(c->rfd, buf, MINIMUM(rlen, CHAN_RBUF));
1.349 naddy 2162: if (len < 0 && (errno == EINTR || errno == EAGAIN))
1.367 djm 2163: return sshbuf_len(c->input);
1.302 djm 2164: if (len <= 0) {
1.367 djm 2165: debug2("channel %d: ctl read<=0 rfd %d len %zd",
1.349 naddy 2166: c->self, c->rfd, len);
1.367 djm 2167: chan_read_failed(ssh, c);
1.349 naddy 2168: return 0;
1.367 djm 2169: } else if ((r = sshbuf_put(c->input, buf, len)) != 0) {
2170: fatal("%s: channel %d: append: %s",
2171: __func__, c->self, ssh_err(r));
2172: }
1.302 djm 2173: }
1.367 djm 2174: return sshbuf_len(c->input);
1.302 djm 2175: }
2176:
2177: static void
1.367 djm 2178: channel_post_mux_client_read(struct ssh *ssh, Channel *c,
2179: fd_set *readset, fd_set *writeset)
1.302 djm 2180: {
2181: u_int need;
2182:
1.367 djm 2183: if (c->rfd == -1 || !FD_ISSET(c->rfd, readset))
2184: return;
2185: if (c->istate != CHAN_INPUT_OPEN && c->istate != CHAN_INPUT_WAIT_DRAIN)
2186: return;
2187: if (c->mux_pause)
2188: return;
2189:
2190: /*
2191: * Don't not read past the precise end of packets to
2192: * avoid disrupting fd passing.
2193: */
2194: if (read_mux(ssh, c, 4) < 4) /* read header */
2195: return;
2196: /* XXX sshbuf_peek_u32 */
2197: need = PEEK_U32(sshbuf_ptr(c->input));
1.302 djm 2198: #define CHANNEL_MUX_MAX_PACKET (256 * 1024)
1.367 djm 2199: if (need > CHANNEL_MUX_MAX_PACKET) {
2200: debug2("channel %d: packet too big %u > %u",
2201: c->self, CHANNEL_MUX_MAX_PACKET, need);
2202: chan_rcvd_oclose(ssh, c);
2203: return;
2204: }
2205: if (read_mux(ssh, c, need + 4) < need + 4) /* read body */
2206: return;
2207: if (c->mux_rcb(ssh, c) != 0) {
2208: debug("channel %d: mux_rcb failed", c->self);
2209: chan_mark_dead(ssh, c);
2210: return;
1.302 djm 2211: }
1.367 djm 2212: }
2213:
2214: static void
2215: channel_post_mux_client_write(struct ssh *ssh, Channel *c,
2216: fd_set *readset, fd_set *writeset)
2217: {
2218: ssize_t len;
2219: int r;
1.302 djm 2220:
1.367 djm 2221: if (c->wfd == -1 || !FD_ISSET(c->wfd, writeset) ||
2222: sshbuf_len(c->output) == 0)
2223: return;
2224:
2225: len = write(c->wfd, sshbuf_ptr(c->output), sshbuf_len(c->output));
2226: if (len < 0 && (errno == EINTR || errno == EAGAIN))
2227: return;
2228: if (len <= 0) {
2229: chan_mark_dead(ssh, c);
2230: return;
1.302 djm 2231: }
1.367 djm 2232: if ((r = sshbuf_consume(c->output, len)) != 0)
2233: fatal("%s: channel %d: consume: %s", __func__,
2234: c->self, ssh_err(r));
2235: }
2236:
2237: static void
2238: channel_post_mux_client(struct ssh *ssh, Channel *c,
2239: fd_set *readset, fd_set *writeset)
2240: {
2241: channel_post_mux_client_read(ssh, c, readset, writeset);
2242: channel_post_mux_client_write(ssh, c, readset, writeset);
1.302 djm 2243: }
2244:
2245: static void
1.367 djm 2246: channel_post_mux_listener(struct ssh *ssh, Channel *c,
2247: fd_set *readset, fd_set *writeset)
1.302 djm 2248: {
2249: Channel *nc;
2250: struct sockaddr_storage addr;
2251: socklen_t addrlen;
2252: int newsock;
2253: uid_t euid;
2254: gid_t egid;
2255:
2256: if (!FD_ISSET(c->sock, readset))
2257: return;
2258:
2259: debug("multiplexing control connection");
2260:
2261: /*
2262: * Accept connection on control socket
2263: */
2264: memset(&addr, 0, sizeof(addr));
2265: addrlen = sizeof(addr);
2266: if ((newsock = accept(c->sock, (struct sockaddr*)&addr,
2267: &addrlen)) == -1) {
2268: error("%s accept: %s", __func__, strerror(errno));
1.317 djm 2269: if (errno == EMFILE || errno == ENFILE)
1.322 dtucker 2270: c->notbefore = monotime() + 1;
1.302 djm 2271: return;
2272: }
2273:
2274: if (getpeereid(newsock, &euid, &egid) < 0) {
2275: error("%s getpeereid failed: %s", __func__,
2276: strerror(errno));
2277: close(newsock);
2278: return;
2279: }
2280: if ((euid != 0) && (getuid() != euid)) {
2281: error("multiplex uid mismatch: peer euid %u != uid %u",
2282: (u_int)euid, (u_int)getuid());
2283: close(newsock);
2284: return;
2285: }
1.367 djm 2286: nc = channel_new(ssh, "multiplex client", SSH_CHANNEL_MUX_CLIENT,
1.302 djm 2287: newsock, newsock, -1, c->local_window_max,
2288: c->local_maxpacket, 0, "mux-control", 1);
2289: nc->mux_rcb = c->mux_rcb;
1.367 djm 2290: debug3("%s: new mux channel %d fd %d", __func__, nc->self, nc->sock);
1.302 djm 2291: /* establish state */
1.367 djm 2292: nc->mux_rcb(ssh, nc);
1.302 djm 2293: /* mux state transitions must not elicit protocol messages */
2294: nc->flags |= CHAN_LOCAL;
2295: }
2296:
1.127 itojun 2297: static void
1.367 djm 2298: channel_handler_init(struct ssh_channels *sc)
1.1 deraadt 2299: {
1.367 djm 2300: chan_fn **pre, **post;
2301:
2302: if ((pre = calloc(SSH_CHANNEL_MAX_TYPE, sizeof(*pre))) == NULL ||
2303: (post = calloc(SSH_CHANNEL_MAX_TYPE, sizeof(*post))) == NULL)
2304: fatal("%s: allocation failed", __func__);
2305:
2306: pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
2307: pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
2308: pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
2309: pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
2310: pre[SSH_CHANNEL_UNIX_LISTENER] = &channel_pre_listener;
2311: pre[SSH_CHANNEL_RUNIX_LISTENER] = &channel_pre_listener;
2312: pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
2313: pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
2314: pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
2315: pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
1.372 markus 2316: pre[SSH_CHANNEL_RDYNAMIC_FINISH] = &channel_pre_connecting;
1.367 djm 2317: pre[SSH_CHANNEL_MUX_LISTENER] = &channel_pre_listener;
2318: pre[SSH_CHANNEL_MUX_CLIENT] = &channel_pre_mux_client;
2319:
2320: post[SSH_CHANNEL_OPEN] = &channel_post_open;
2321: post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
2322: post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
2323: post[SSH_CHANNEL_UNIX_LISTENER] = &channel_post_port_listener;
2324: post[SSH_CHANNEL_RUNIX_LISTENER] = &channel_post_port_listener;
2325: post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
2326: post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
2327: post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
2328: post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
1.372 markus 2329: post[SSH_CHANNEL_RDYNAMIC_FINISH] = &channel_post_connecting;
1.367 djm 2330: post[SSH_CHANNEL_MUX_LISTENER] = &channel_post_mux_listener;
2331: post[SSH_CHANNEL_MUX_CLIENT] = &channel_post_mux_client;
1.180 deraadt 2332:
1.367 djm 2333: sc->channel_pre = pre;
2334: sc->channel_post = post;
1.44 markus 2335: }
2336:
1.140 markus 2337: /* gc dead channels */
2338: static void
1.367 djm 2339: channel_garbage_collect(struct ssh *ssh, Channel *c)
1.140 markus 2340: {
2341: if (c == NULL)
2342: return;
2343: if (c->detach_user != NULL) {
1.367 djm 2344: if (!chan_is_dead(ssh, c, c->detach_close))
1.140 markus 2345: return;
1.385 ! djm 2346:
1.194 markus 2347: debug2("channel %d: gc: notify user", c->self);
1.367 djm 2348: c->detach_user(ssh, c->self, NULL);
1.140 markus 2349: /* if we still have a callback */
2350: if (c->detach_user != NULL)
2351: return;
1.194 markus 2352: debug2("channel %d: gc: user detached", c->self);
1.140 markus 2353: }
1.367 djm 2354: if (!chan_is_dead(ssh, c, 1))
1.140 markus 2355: return;
1.194 markus 2356: debug2("channel %d: garbage collecting", c->self);
1.367 djm 2357: channel_free(ssh, c);
1.140 markus 2358: }
2359:
1.367 djm 2360: enum channel_table { CHAN_PRE, CHAN_POST };
2361:
1.127 itojun 2362: static void
1.367 djm 2363: channel_handler(struct ssh *ssh, int table,
1.366 djm 2364: fd_set *readset, fd_set *writeset, time_t *unpause_secs)
1.41 markus 2365: {
1.367 djm 2366: struct ssh_channels *sc = ssh->chanctxt;
2367: chan_fn **ftab = table == CHAN_PRE ? sc->channel_pre : sc->channel_post;
1.299 markus 2368: u_int i, oalloc;
1.41 markus 2369: Channel *c;
1.317 djm 2370: time_t now;
1.25 markus 2371:
1.322 dtucker 2372: now = monotime();
1.317 djm 2373: if (unpause_secs != NULL)
2374: *unpause_secs = 0;
1.367 djm 2375: for (i = 0, oalloc = sc->channels_alloc; i < oalloc; i++) {
2376: c = sc->channels[i];
1.113 markus 2377: if (c == NULL)
1.41 markus 2378: continue;
1.299 markus 2379: if (c->delayed) {
1.367 djm 2380: if (table == CHAN_PRE)
1.299 markus 2381: c->delayed = 0;
2382: else
2383: continue;
2384: }
1.317 djm 2385: if (ftab[c->type] != NULL) {
2386: /*
2387: * Run handlers that are not paused.
2388: */
2389: if (c->notbefore <= now)
1.367 djm 2390: (*ftab[c->type])(ssh, c, readset, writeset);
1.317 djm 2391: else if (unpause_secs != NULL) {
2392: /*
2393: * Collect the time that the earliest
2394: * channel comes off pause.
2395: */
2396: debug3("%s: chan %d: skip for %d more seconds",
2397: __func__, c->self,
2398: (int)(c->notbefore - now));
2399: if (*unpause_secs == 0 ||
2400: (c->notbefore - now) < *unpause_secs)
2401: *unpause_secs = c->notbefore - now;
2402: }
2403: }
1.367 djm 2404: channel_garbage_collect(ssh, c);
1.1 deraadt 2405: }
1.317 djm 2406: if (unpause_secs != NULL && *unpause_secs != 0)
2407: debug3("%s: first channel unpauses in %d seconds",
2408: __func__, (int)*unpause_secs);
1.1 deraadt 2409: }
2410:
1.121 markus 2411: /*
1.372 markus 2412: * Create sockets before allocating the select bitmasks.
2413: * This is necessary for things that need to happen after reading
2414: * the network-input but before channel_prepare_select().
2415: */
2416: static void
2417: channel_before_prepare_select(struct ssh *ssh)
2418: {
2419: struct ssh_channels *sc = ssh->chanctxt;
2420: Channel *c;
2421: u_int i, oalloc;
2422:
2423: for (i = 0, oalloc = sc->channels_alloc; i < oalloc; i++) {
2424: c = sc->channels[i];
2425: if (c == NULL)
2426: continue;
2427: if (c->type == SSH_CHANNEL_RDYNAMIC_OPEN)
2428: channel_before_prepare_select_rdynamic(ssh, c);
2429: }
2430: }
2431:
2432: /*
1.121 markus 2433: * Allocate/update select bitmasks and add any bits relevant to channels in
2434: * select bitmasks.
2435: */
1.49 markus 2436: void
1.366 djm 2437: channel_prepare_select(struct ssh *ssh, fd_set **readsetp, fd_set **writesetp,
2438: int *maxfdp, u_int *nallocp, time_t *minwait_secs)
1.41 markus 2439: {
1.243 djm 2440: u_int n, sz, nfdset;
1.84 markus 2441:
1.372 markus 2442: channel_before_prepare_select(ssh); /* might update channel_max_fd */
2443:
1.367 djm 2444: n = MAXIMUM(*maxfdp, ssh->chanctxt->channel_max_fd);
1.84 markus 2445:
1.243 djm 2446: nfdset = howmany(n+1, NFDBITS);
2447: /* Explicitly test here, because xrealloc isn't always called */
1.341 millert 2448: if (nfdset && SIZE_MAX / nfdset < sizeof(fd_mask))
1.243 djm 2449: fatal("channel_prepare_select: max_fd (%d) is too large", n);
2450: sz = nfdset * sizeof(fd_mask);
2451:
1.132 markus 2452: /* perhaps check sz < nalloc/2 and shrink? */
2453: if (*readsetp == NULL || sz > *nallocp) {
1.342 deraadt 2454: *readsetp = xreallocarray(*readsetp, nfdset, sizeof(fd_mask));
2455: *writesetp = xreallocarray(*writesetp, nfdset, sizeof(fd_mask));
1.132 markus 2456: *nallocp = sz;
1.84 markus 2457: }
1.132 markus 2458: *maxfdp = n;
1.84 markus 2459: memset(*readsetp, 0, sz);
2460: memset(*writesetp, 0, sz);
2461:
1.366 djm 2462: if (!ssh_packet_is_rekeying(ssh))
1.367 djm 2463: channel_handler(ssh, CHAN_PRE, *readsetp, *writesetp,
1.317 djm 2464: minwait_secs);
1.41 markus 2465: }
2466:
1.121 markus 2467: /*
2468: * After select, perform any appropriate operations for channels which have
2469: * events pending.
2470: */
1.49 markus 2471: void
1.366 djm 2472: channel_after_select(struct ssh *ssh, fd_set *readset, fd_set *writeset)
1.41 markus 2473: {
1.367 djm 2474: channel_handler(ssh, CHAN_POST, readset, writeset, NULL);
2475: }
2476:
2477: /*
2478: * Enqueue data for channels with open or draining c->input.
2479: */
2480: static void
2481: channel_output_poll_input_open(struct ssh *ssh, Channel *c)
2482: {
1.373 djm 2483: size_t len, plen;
2484: const u_char *pkt;
1.367 djm 2485: int r;
2486:
2487: if ((len = sshbuf_len(c->input)) == 0) {
2488: if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
2489: /*
2490: * input-buffer is empty and read-socket shutdown:
2491: * tell peer, that we will not send more data:
2492: * send IEOF.
2493: * hack for extended data: delay EOF if EFD still
2494: * in use.
2495: */
2496: if (CHANNEL_EFD_INPUT_ACTIVE(c))
2497: debug2("channel %d: "
2498: "ibuf_empty delayed efd %d/(%zu)",
2499: c->self, c->efd, sshbuf_len(c->extended));
2500: else
2501: chan_ibuf_empty(ssh, c);
2502: }
2503: return;
2504: }
2505:
1.368 djm 2506: if (!c->have_remote_id)
2507: fatal(":%s: channel %d: no remote id", __func__, c->self);
2508:
1.367 djm 2509: if (c->datagram) {
2510: /* Check datagram will fit; drop if not */
1.373 djm 2511: if ((r = sshbuf_get_string_direct(c->input, &pkt, &plen)) != 0)
2512: fatal("%s: channel %d: get datagram: %s", __func__,
1.367 djm 2513: c->self, ssh_err(r));
2514: /*
2515: * XXX this does tail-drop on the datagram queue which is
2516: * usually suboptimal compared to head-drop. Better to have
2517: * backpressure at read time? (i.e. read + discard)
2518: */
1.373 djm 2519: if (plen > c->remote_window || plen > c->remote_maxpacket) {
1.367 djm 2520: debug("channel %d: datagram too big", c->self);
2521: return;
2522: }
2523: /* Enqueue it */
2524: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_DATA)) != 0 ||
2525: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
1.373 djm 2526: (r = sshpkt_put_string(ssh, pkt, plen)) != 0 ||
1.367 djm 2527: (r = sshpkt_send(ssh)) != 0) {
2528: fatal("%s: channel %i: datagram: %s", __func__,
2529: c->self, ssh_err(r));
2530: }
1.373 djm 2531: c->remote_window -= plen;
1.367 djm 2532: return;
2533: }
2534:
2535: /* Enqueue packet for buffered data. */
2536: if (len > c->remote_window)
2537: len = c->remote_window;
2538: if (len > c->remote_maxpacket)
2539: len = c->remote_maxpacket;
2540: if (len == 0)
2541: return;
2542: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_DATA)) != 0 ||
2543: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
2544: (r = sshpkt_put_string(ssh, sshbuf_ptr(c->input), len)) != 0 ||
2545: (r = sshpkt_send(ssh)) != 0) {
2546: fatal("%s: channel %i: data: %s", __func__,
2547: c->self, ssh_err(r));
2548: }
2549: if ((r = sshbuf_consume(c->input, len)) != 0)
2550: fatal("%s: channel %i: consume: %s", __func__,
2551: c->self, ssh_err(r));
2552: c->remote_window -= len;
1.41 markus 2553: }
2554:
1.367 djm 2555: /*
2556: * Enqueue data for channels with open c->extended in read mode.
2557: */
2558: static void
2559: channel_output_poll_extended_read(struct ssh *ssh, Channel *c)
2560: {
2561: size_t len;
2562: int r;
2563:
2564: if ((len = sshbuf_len(c->extended)) == 0)
2565: return;
2566:
2567: debug2("channel %d: rwin %u elen %zu euse %d", c->self,
2568: c->remote_window, sshbuf_len(c->extended), c->extended_usage);
2569: if (len > c->remote_window)
2570: len = c->remote_window;
2571: if (len > c->remote_maxpacket)
2572: len = c->remote_maxpacket;
2573: if (len == 0)
2574: return;
1.368 djm 2575: if (!c->have_remote_id)
2576: fatal(":%s: channel %d: no remote id", __func__, c->self);
1.367 djm 2577: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA)) != 0 ||
2578: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
2579: (r = sshpkt_put_u32(ssh, SSH2_EXTENDED_DATA_STDERR)) != 0 ||
2580: (r = sshpkt_put_string(ssh, sshbuf_ptr(c->extended), len)) != 0 ||
2581: (r = sshpkt_send(ssh)) != 0) {
2582: fatal("%s: channel %i: data: %s", __func__,
2583: c->self, ssh_err(r));
2584: }
2585: if ((r = sshbuf_consume(c->extended, len)) != 0)
2586: fatal("%s: channel %i: consume: %s", __func__,
2587: c->self, ssh_err(r));
2588: c->remote_window -= len;
2589: debug2("channel %d: sent ext data %zu", c->self, len);
2590: }
1.121 markus 2591:
1.84 markus 2592: /* If there is data to send to the connection, enqueue some of it now. */
1.49 markus 2593: void
1.367 djm 2594: channel_output_poll(struct ssh *ssh)
1.1 deraadt 2595: {
1.367 djm 2596: struct ssh_channels *sc = ssh->chanctxt;
1.41 markus 2597: Channel *c;
1.367 djm 2598: u_int i;
1.1 deraadt 2599:
1.367 djm 2600: for (i = 0; i < sc->channels_alloc; i++) {
2601: c = sc->channels[i];
1.113 markus 2602: if (c == NULL)
2603: continue;
1.37 markus 2604:
1.121 markus 2605: /*
2606: * We are only interested in channels that can have buffered
2607: * incoming data.
2608: */
1.358 djm 2609: if (c->type != SSH_CHANNEL_OPEN)
2610: continue;
2611: if ((c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
1.93 markus 2612: /* XXX is this true? */
1.367 djm 2613: debug3("channel %d: will not send data after close",
2614: c->self);
1.44 markus 2615: continue;
2616: }
1.25 markus 2617:
2618: /* Get the amount of buffered data for this channel. */
1.367 djm 2619: if (c->istate == CHAN_INPUT_OPEN ||
2620: c->istate == CHAN_INPUT_WAIT_DRAIN)
2621: channel_output_poll_input_open(ssh, c);
1.44 markus 2622: /* Send extended data, i.e. stderr */
1.358 djm 2623: if (!(c->flags & CHAN_EOF_SENT) &&
1.367 djm 2624: c->extended_usage == CHAN_EXTENDED_READ)
2625: channel_output_poll_extended_read(ssh, c);
1.25 markus 2626: }
1.1 deraadt 2627: }
2628:
1.354 markus 2629: /* -- mux proxy support */
2630:
2631: /*
2632: * When multiplexing channel messages for mux clients we have to deal
2633: * with downstream messages from the mux client and upstream messages
2634: * from the ssh server:
2635: * 1) Handling downstream messages is straightforward and happens
2636: * in channel_proxy_downstream():
2637: * - We forward all messages (mostly) unmodified to the server.
2638: * - However, in order to route messages from upstream to the correct
2639: * downstream client, we have to replace the channel IDs used by the
2640: * mux clients with a unique channel ID because the mux clients might
2641: * use conflicting channel IDs.
2642: * - so we inspect and change both SSH2_MSG_CHANNEL_OPEN and
2643: * SSH2_MSG_CHANNEL_OPEN_CONFIRMATION messages, create a local
2644: * SSH_CHANNEL_MUX_PROXY channel and replace the mux clients ID
2645: * with the newly allocated channel ID.
2646: * 2) Upstream messages are received by matching SSH_CHANNEL_MUX_PROXY
1.380 djm 2647: * channels and processed by channel_proxy_upstream(). The local channel ID
1.354 markus 2648: * is then translated back to the original mux client ID.
2649: * 3) In both cases we need to keep track of matching SSH2_MSG_CHANNEL_CLOSE
2650: * messages so we can clean up SSH_CHANNEL_MUX_PROXY channels.
2651: * 4) The SSH_CHANNEL_MUX_PROXY channels also need to closed when the
2652: * downstream mux client are removed.
2653: * 5) Handling SSH2_MSG_CHANNEL_OPEN messages from the upstream server
2654: * requires more work, because they are not addressed to a specific
2655: * channel. E.g. client_request_forwarded_tcpip() needs to figure
2656: * out whether the request is addressed to the local client or a
2657: * specific downstream client based on the listen-address/port.
1.380 djm 2658: * 6) Agent and X11-Forwarding have a similar problem and are currently
1.354 markus 2659: * not supported as the matching session/channel cannot be identified
2660: * easily.
2661: */
2662:
2663: /*
2664: * receive packets from downstream mux clients:
2665: * channel callback fired on read from mux client, creates
2666: * SSH_CHANNEL_MUX_PROXY channels and translates channel IDs
2667: * on channel creation.
2668: */
2669: int
1.367 djm 2670: channel_proxy_downstream(struct ssh *ssh, Channel *downstream)
1.354 markus 2671: {
2672: Channel *c = NULL;
2673: struct sshbuf *original = NULL, *modified = NULL;
2674: const u_char *cp;
2675: char *ctype = NULL, *listen_host = NULL;
2676: u_char type;
2677: size_t have;
1.370 djm 2678: int ret = -1, r;
1.355 djm 2679: u_int id, remote_id, listen_port;
1.354 markus 2680:
1.367 djm 2681: /* sshbuf_dump(downstream->input, stderr); */
2682: if ((r = sshbuf_get_string_direct(downstream->input, &cp, &have))
1.354 markus 2683: != 0) {
2684: error("%s: malformed message: %s", __func__, ssh_err(r));
2685: return -1;
2686: }
2687: if (have < 2) {
2688: error("%s: short message", __func__);
2689: return -1;
2690: }
2691: type = cp[1];
2692: /* skip padlen + type */
2693: cp += 2;
2694: have -= 2;
2695: if (ssh_packet_log_type(type))
2696: debug3("%s: channel %u: down->up: type %u", __func__,
2697: downstream->self, type);
2698:
2699: switch (type) {
2700: case SSH2_MSG_CHANNEL_OPEN:
2701: if ((original = sshbuf_from(cp, have)) == NULL ||
2702: (modified = sshbuf_new()) == NULL) {
2703: error("%s: alloc", __func__);
2704: goto out;
2705: }
2706: if ((r = sshbuf_get_cstring(original, &ctype, NULL)) != 0 ||
2707: (r = sshbuf_get_u32(original, &id)) != 0) {
2708: error("%s: parse error %s", __func__, ssh_err(r));
2709: goto out;
2710: }
1.367 djm 2711: c = channel_new(ssh, "mux proxy", SSH_CHANNEL_MUX_PROXY,
1.354 markus 2712: -1, -1, -1, 0, 0, 0, ctype, 1);
2713: c->mux_ctx = downstream; /* point to mux client */
2714: c->mux_downstream_id = id; /* original downstream id */
2715: if ((r = sshbuf_put_cstring(modified, ctype)) != 0 ||
2716: (r = sshbuf_put_u32(modified, c->self)) != 0 ||
2717: (r = sshbuf_putb(modified, original)) != 0) {
2718: error("%s: compose error %s", __func__, ssh_err(r));
1.367 djm 2719: channel_free(ssh, c);
1.354 markus 2720: goto out;
2721: }
2722: break;
2723: case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION:
2724: /*
2725: * Almost the same as SSH2_MSG_CHANNEL_OPEN, except then we
2726: * need to parse 'remote_id' instead of 'ctype'.
2727: */
2728: if ((original = sshbuf_from(cp, have)) == NULL ||
2729: (modified = sshbuf_new()) == NULL) {
2730: error("%s: alloc", __func__);
2731: goto out;
2732: }
2733: if ((r = sshbuf_get_u32(original, &remote_id)) != 0 ||
2734: (r = sshbuf_get_u32(original, &id)) != 0) {
2735: error("%s: parse error %s", __func__, ssh_err(r));
2736: goto out;
2737: }
1.367 djm 2738: c = channel_new(ssh, "mux proxy", SSH_CHANNEL_MUX_PROXY,
1.354 markus 2739: -1, -1, -1, 0, 0, 0, "mux-down-connect", 1);
2740: c->mux_ctx = downstream; /* point to mux client */
2741: c->mux_downstream_id = id;
2742: c->remote_id = remote_id;
1.368 djm 2743: c->have_remote_id = 1;
1.354 markus 2744: if ((r = sshbuf_put_u32(modified, remote_id)) != 0 ||
2745: (r = sshbuf_put_u32(modified, c->self)) != 0 ||
2746: (r = sshbuf_putb(modified, original)) != 0) {
2747: error("%s: compose error %s", __func__, ssh_err(r));
1.367 djm 2748: channel_free(ssh, c);
1.354 markus 2749: goto out;
2750: }
2751: break;
2752: case SSH2_MSG_GLOBAL_REQUEST:
2753: if ((original = sshbuf_from(cp, have)) == NULL) {
2754: error("%s: alloc", __func__);
2755: goto out;
2756: }
2757: if ((r = sshbuf_get_cstring(original, &ctype, NULL)) != 0) {
2758: error("%s: parse error %s", __func__, ssh_err(r));
2759: goto out;
2760: }
2761: if (strcmp(ctype, "tcpip-forward") != 0) {
2762: error("%s: unsupported request %s", __func__, ctype);
2763: goto out;
2764: }
2765: if ((r = sshbuf_get_u8(original, NULL)) != 0 ||
2766: (r = sshbuf_get_cstring(original, &listen_host, NULL)) != 0 ||
2767: (r = sshbuf_get_u32(original, &listen_port)) != 0) {
2768: error("%s: parse error %s", __func__, ssh_err(r));
2769: goto out;
2770: }
1.355 djm 2771: if (listen_port > 65535) {
2772: error("%s: tcpip-forward for %s: bad port %u",
2773: __func__, listen_host, listen_port);
2774: goto out;
2775: }
1.354 markus 2776: /* Record that connection to this host/port is permitted. */
1.381 djm 2777: permission_set_add(ssh, FORWARD_USER, FORWARD_LOCAL, "<mux>", -1,
1.367 djm 2778: listen_host, NULL, (int)listen_port, downstream);
1.354 markus 2779: listen_host = NULL;
2780: break;
2781: case SSH2_MSG_CHANNEL_CLOSE:
2782: if (have < 4)
2783: break;
2784: remote_id = PEEK_U32(cp);
1.367 djm 2785: if ((c = channel_by_remote_id(ssh, remote_id)) != NULL) {
1.354 markus 2786: if (c->flags & CHAN_CLOSE_RCVD)
1.367 djm 2787: channel_free(ssh, c);
1.354 markus 2788: else
2789: c->flags |= CHAN_CLOSE_SENT;
2790: }
2791: break;
2792: }
2793: if (modified) {
2794: if ((r = sshpkt_start(ssh, type)) != 0 ||
2795: (r = sshpkt_putb(ssh, modified)) != 0 ||
2796: (r = sshpkt_send(ssh)) != 0) {
2797: error("%s: send %s", __func__, ssh_err(r));
2798: goto out;
2799: }
2800: } else {
2801: if ((r = sshpkt_start(ssh, type)) != 0 ||
2802: (r = sshpkt_put(ssh, cp, have)) != 0 ||
2803: (r = sshpkt_send(ssh)) != 0) {
2804: error("%s: send %s", __func__, ssh_err(r));
2805: goto out;
2806: }
2807: }
2808: ret = 0;
2809: out:
2810: free(ctype);
2811: free(listen_host);
2812: sshbuf_free(original);
2813: sshbuf_free(modified);
2814: return ret;
2815: }
2816:
2817: /*
2818: * receive packets from upstream server and de-multiplex packets
2819: * to correct downstream:
2820: * implemented as a helper for channel input handlers,
2821: * replaces local (proxy) channel ID with downstream channel ID.
2822: */
2823: int
1.363 markus 2824: channel_proxy_upstream(Channel *c, int type, u_int32_t seq, struct ssh *ssh)
1.354 markus 2825: {
2826: struct sshbuf *b = NULL;
2827: Channel *downstream;
2828: const u_char *cp = NULL;
2829: size_t len;
2830: int r;
2831:
2832: /*
2833: * When receiving packets from the peer we need to check whether we
2834: * need to forward the packets to the mux client. In this case we
1.380 djm 2835: * restore the original channel id and keep track of CLOSE messages,
1.354 markus 2836: * so we can cleanup the channel.
2837: */
2838: if (c == NULL || c->type != SSH_CHANNEL_MUX_PROXY)
2839: return 0;
2840: if ((downstream = c->mux_ctx) == NULL)
2841: return 0;
2842: switch (type) {
2843: case SSH2_MSG_CHANNEL_CLOSE:
2844: case SSH2_MSG_CHANNEL_DATA:
2845: case SSH2_MSG_CHANNEL_EOF:
2846: case SSH2_MSG_CHANNEL_EXTENDED_DATA:
2847: case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION:
2848: case SSH2_MSG_CHANNEL_OPEN_FAILURE:
2849: case SSH2_MSG_CHANNEL_WINDOW_ADJUST:
2850: case SSH2_MSG_CHANNEL_SUCCESS:
2851: case SSH2_MSG_CHANNEL_FAILURE:
2852: case SSH2_MSG_CHANNEL_REQUEST:
2853: break;
2854: default:
2855: debug2("%s: channel %u: unsupported type %u", __func__,
2856: c->self, type);
2857: return 0;
2858: }
2859: if ((b = sshbuf_new()) == NULL) {
2860: error("%s: alloc reply", __func__);
2861: goto out;
2862: }
2863: /* get remaining payload (after id) */
2864: cp = sshpkt_ptr(ssh, &len);
2865: if (cp == NULL) {
2866: error("%s: no packet", __func__);
2867: goto out;
2868: }
2869: /* translate id and send to muxclient */
2870: if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */
2871: (r = sshbuf_put_u8(b, type)) != 0 ||
2872: (r = sshbuf_put_u32(b, c->mux_downstream_id)) != 0 ||
2873: (r = sshbuf_put(b, cp, len)) != 0 ||
1.367 djm 2874: (r = sshbuf_put_stringb(downstream->output, b)) != 0) {
1.354 markus 2875: error("%s: compose for muxclient %s", __func__, ssh_err(r));
2876: goto out;
2877: }
2878: /* sshbuf_dump(b, stderr); */
2879: if (ssh_packet_log_type(type))
2880: debug3("%s: channel %u: up->down: type %u", __func__, c->self,
2881: type);
2882: out:
2883: /* update state */
2884: switch (type) {
2885: case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION:
2886: /* record remote_id for SSH2_MSG_CHANNEL_CLOSE */
1.368 djm 2887: if (cp && len > 4) {
1.354 markus 2888: c->remote_id = PEEK_U32(cp);
1.368 djm 2889: c->have_remote_id = 1;
2890: }
1.354 markus 2891: break;
2892: case SSH2_MSG_CHANNEL_CLOSE:
2893: if (c->flags & CHAN_CLOSE_SENT)
1.367 djm 2894: channel_free(ssh, c);
1.354 markus 2895: else
2896: c->flags |= CHAN_CLOSE_RCVD;
2897: break;
2898: }
2899: sshbuf_free(b);
2900: return 1;
2901: }
1.121 markus 2902:
2903: /* -- protocol input */
1.249 djm 2904:
1.367 djm 2905: /* Parse a channel ID from the current packet */
2906: static int
2907: channel_parse_id(struct ssh *ssh, const char *where, const char *what)
2908: {
2909: u_int32_t id;
2910: int r;
2911:
2912: if ((r = sshpkt_get_u32(ssh, &id)) != 0) {
2913: error("%s: parse id: %s", where, ssh_err(r));
2914: ssh_packet_disconnect(ssh, "Invalid %s message", what);
2915: }
2916: if (id > INT_MAX) {
2917: error("%s: bad channel id %u: %s", where, id, ssh_err(r));
2918: ssh_packet_disconnect(ssh, "Invalid %s channel id", what);
2919: }
2920: return (int)id;
2921: }
2922:
2923: /* Lookup a channel from an ID in the current packet */
2924: static Channel *
2925: channel_from_packet_id(struct ssh *ssh, const char *where, const char *what)
2926: {
2927: int id = channel_parse_id(ssh, where, what);
2928: Channel *c;
2929:
2930: if ((c = channel_lookup(ssh, id)) == NULL) {
2931: ssh_packet_disconnect(ssh,
2932: "%s packet referred to nonexistent channel %d", what, id);
2933: }
2934: return c;
2935: }
2936:
1.339 markus 2937: int
1.363 markus 2938: channel_input_data(int type, u_int32_t seq, struct ssh *ssh)
1.1 deraadt 2939: {
1.332 djm 2940: const u_char *data;
1.367 djm 2941: size_t data_len, win_len;
2942: Channel *c = channel_from_packet_id(ssh, __func__, "data");
2943: int r;
1.25 markus 2944:
1.363 markus 2945: if (channel_proxy_upstream(c, type, seq, ssh))
1.354 markus 2946: return 0;
1.25 markus 2947:
2948: /* Ignore any data for non-open channels (might happen on close) */
1.41 markus 2949: if (c->type != SSH_CHANNEL_OPEN &&
1.372 markus 2950: c->type != SSH_CHANNEL_RDYNAMIC_OPEN &&
2951: c->type != SSH_CHANNEL_RDYNAMIC_FINISH &&
1.41 markus 2952: c->type != SSH_CHANNEL_X11_OPEN)
1.339 markus 2953: return 0;
1.37 markus 2954:
1.25 markus 2955: /* Get the data. */
1.367 djm 2956: if ((r = sshpkt_get_string_direct(ssh, &data, &data_len)) != 0)
2957: fatal("%s: channel %d: get data: %s", __func__,
2958: c->self, ssh_err(r));
2959: ssh_packet_check_eom(ssh);
2960:
1.309 djm 2961: win_len = data_len;
2962: if (c->datagram)
2963: win_len += 4; /* string length header */
1.200 markus 2964:
2965: /*
1.367 djm 2966: * The sending side reduces its window as it sends data, so we
2967: * must 'fake' consumption of the data in order to ensure that window
2968: * updates are sent back. Otherwise the connection might deadlock.
1.200 markus 2969: */
1.358 djm 2970: if (c->ostate != CHAN_OUTPUT_OPEN) {
2971: c->local_window -= win_len;
2972: c->local_consumed += win_len;
1.339 markus 2973: return 0;
1.200 markus 2974: }
1.41 markus 2975:
1.358 djm 2976: if (win_len > c->local_maxpacket) {
1.367 djm 2977: logit("channel %d: rcvd big packet %zu, maxpack %u",
1.358 djm 2978: c->self, win_len, c->local_maxpacket);
1.367 djm 2979: return 0;
1.358 djm 2980: }
2981: if (win_len > c->local_window) {
1.367 djm 2982: logit("channel %d: rcvd too much data %zu, win %u",
1.358 djm 2983: c->self, win_len, c->local_window);
2984: return 0;
1.44 markus 2985: }
1.358 djm 2986: c->local_window -= win_len;
2987:
1.367 djm 2988: if (c->datagram) {
2989: if ((r = sshbuf_put_string(c->output, data, data_len)) != 0)
2990: fatal("%s: channel %d: append datagram: %s",
2991: __func__, c->self, ssh_err(r));
2992: } else if ((r = sshbuf_put(c->output, data, data_len)) != 0)
2993: fatal("%s: channel %d: append data: %s",
2994: __func__, c->self, ssh_err(r));
2995:
1.339 markus 2996: return 0;
1.1 deraadt 2997: }
1.121 markus 2998:
1.339 markus 2999: int
1.363 markus 3000: channel_input_extended_data(int type, u_int32_t seq, struct ssh *ssh)
1.44 markus 3001: {
1.367 djm 3002: const u_char *data;
3003: size_t data_len;
3004: u_int32_t tcode;
3005: Channel *c = channel_from_packet_id(ssh, __func__, "extended data");
3006: int r;
1.44 markus 3007:
1.363 markus 3008: if (channel_proxy_upstream(c, type, seq, ssh))
1.354 markus 3009: return 0;
1.44 markus 3010: if (c->type != SSH_CHANNEL_OPEN) {
1.367 djm 3011: logit("channel %d: ext data for non open", c->self);
1.339 markus 3012: return 0;
1.172 markus 3013: }
3014: if (c->flags & CHAN_EOF_RCVD) {
3015: if (datafellows & SSH_BUG_EXTEOF)
1.367 djm 3016: debug("channel %d: accepting ext data after eof",
3017: c->self);
1.172 markus 3018: else
1.367 djm 3019: ssh_packet_disconnect(ssh, "Received extended_data "
3020: "after EOF on channel %d.", c->self);
3021: }
3022:
3023: if ((r = sshpkt_get_u32(ssh, &tcode)) != 0) {
3024: error("%s: parse tcode: %s", __func__, ssh_err(r));
3025: ssh_packet_disconnect(ssh, "Invalid extended_data message");
1.44 markus 3026: }
3027: if (c->efd == -1 ||
3028: c->extended_usage != CHAN_EXTENDED_WRITE ||
3029: tcode != SSH2_EXTENDED_DATA_STDERR) {
1.188 itojun 3030: logit("channel %d: bad ext data", c->self);
1.339 markus 3031: return 0;
1.44 markus 3032: }
1.367 djm 3033: if ((r = sshpkt_get_string_direct(ssh, &data, &data_len)) != 0) {
3034: error("%s: parse data: %s", __func__, ssh_err(r));
3035: ssh_packet_disconnect(ssh, "Invalid extended_data message");
3036: }
3037: ssh_packet_check_eom(ssh);
3038:
1.44 markus 3039: if (data_len > c->local_window) {
1.367 djm 3040: logit("channel %d: rcvd too much extended_data %zu, win %u",
1.44 markus 3041: c->self, data_len, c->local_window);
1.339 markus 3042: return 0;
1.44 markus 3043: }
1.367 djm 3044: debug2("channel %d: rcvd ext data %zu", c->self, data_len);
3045: /* XXX sshpkt_getb? */
3046: if ((r = sshbuf_put(c->extended, data, data_len)) != 0)
3047: error("%s: append: %s", __func__, ssh_err(r));
1.44 markus 3048: c->local_window -= data_len;
1.339 markus 3049: return 0;
1.44 markus 3050: }
3051:
1.339 markus 3052: int
1.363 markus 3053: channel_input_ieof(int type, u_int32_t seq, struct ssh *ssh)
1.41 markus 3054: {
1.367 djm 3055: Channel *c = channel_from_packet_id(ssh, __func__, "ieof");
3056:
3057: ssh_packet_check_eom(ssh);
1.41 markus 3058:
1.363 markus 3059: if (channel_proxy_upstream(c, type, seq, ssh))
1.354 markus 3060: return 0;
1.367 djm 3061: chan_rcvd_ieof(ssh, c);
1.133 markus 3062:
3063: /* XXX force input close */
1.156 markus 3064: if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
1.133 markus 3065: debug("channel %d: FORCE input drain", c->self);
3066: c->istate = CHAN_INPUT_WAIT_DRAIN;
1.367 djm 3067: if (sshbuf_len(c->input) == 0)
3068: chan_ibuf_empty(ssh, c);
1.133 markus 3069: }
1.339 markus 3070: return 0;
1.41 markus 3071: }
1.1 deraadt 3072:
1.339 markus 3073: int
1.363 markus 3074: channel_input_oclose(int type, u_int32_t seq, struct ssh *ssh)
1.41 markus 3075: {
1.367 djm 3076: Channel *c = channel_from_packet_id(ssh, __func__, "oclose");
1.151 markus 3077:
1.363 markus 3078: if (channel_proxy_upstream(c, type, seq, ssh))
1.354 markus 3079: return 0;
1.367 djm 3080: ssh_packet_check_eom(ssh);
3081: chan_rcvd_oclose(ssh, c);
1.339 markus 3082: return 0;
1.1 deraadt 3083: }
3084:
1.339 markus 3085: int
1.363 markus 3086: channel_input_open_confirmation(int type, u_int32_t seq, struct ssh *ssh)
1.1 deraadt 3087: {
1.367 djm 3088: Channel *c = channel_from_packet_id(ssh, __func__, "open confirmation");
3089: u_int32_t remote_window, remote_maxpacket;
3090: int r;
1.25 markus 3091:
1.363 markus 3092: if (channel_proxy_upstream(c, type, seq, ssh))
1.354 markus 3093: return 0;
3094: if (c->type != SSH_CHANNEL_OPENING)
1.41 markus 3095: packet_disconnect("Received open confirmation for "
1.367 djm 3096: "non-opening channel %d.", c->self);
3097: /*
3098: * Record the remote channel number and mark that the channel
3099: * is now open.
3100: */
1.368 djm 3101: if ((r = sshpkt_get_u32(ssh, &c->remote_id)) != 0 ||
3102: (r = sshpkt_get_u32(ssh, &remote_window)) != 0 ||
1.367 djm 3103: (r = sshpkt_get_u32(ssh, &remote_maxpacket)) != 0) {
3104: error("%s: window/maxpacket: %s", __func__, ssh_err(r));
3105: packet_disconnect("Invalid open confirmation message");
3106: }
3107: ssh_packet_check_eom(ssh);
3108:
1.368 djm 3109: c->have_remote_id = 1;
1.367 djm 3110: c->remote_window = remote_window;
3111: c->remote_maxpacket = remote_maxpacket;
1.41 markus 3112: c->type = SSH_CHANNEL_OPEN;
1.358 djm 3113: if (c->open_confirm) {
1.367 djm 3114: debug2("%s: channel %d: callback start", __func__, c->self);
3115: c->open_confirm(ssh, c->self, 1, c->open_confirm_ctx);
3116: debug2("%s: channel %d: callback done", __func__, c->self);
1.44 markus 3117: }
1.358 djm 3118: debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
3119: c->remote_window, c->remote_maxpacket);
1.339 markus 3120: return 0;
1.1 deraadt 3121: }
3122:
1.127 itojun 3123: static char *
1.114 markus 3124: reason2txt(int reason)
3125: {
1.143 deraadt 3126: switch (reason) {
1.114 markus 3127: case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
3128: return "administratively prohibited";
3129: case SSH2_OPEN_CONNECT_FAILED:
3130: return "connect failed";
3131: case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
3132: return "unknown channel type";
3133: case SSH2_OPEN_RESOURCE_SHORTAGE:
3134: return "resource shortage";
3135: }
1.117 stevesk 3136: return "unknown reason";
1.114 markus 3137: }
3138:
1.339 markus 3139: int
1.363 markus 3140: channel_input_open_failure(int type, u_int32_t seq, struct ssh *ssh)
1.1 deraadt 3141: {
1.367 djm 3142: Channel *c = channel_from_packet_id(ssh, __func__, "open failure");
3143: u_int32_t reason;
3144: char *msg = NULL;
3145: int r;
1.25 markus 3146:
1.363 markus 3147: if (channel_proxy_upstream(c, type, seq, ssh))
1.354 markus 3148: return 0;
3149: if (c->type != SSH_CHANNEL_OPENING)
1.41 markus 3150: packet_disconnect("Received open failure for "
1.367 djm 3151: "non-opening channel %d.", c->self);
3152: if ((r = sshpkt_get_u32(ssh, &reason)) != 0) {
3153: error("%s: reason: %s", __func__, ssh_err(r));
3154: packet_disconnect("Invalid open failure message");
3155: }
1.378 djm 3156: /* skip language */
3157: if ((r = sshpkt_get_cstring(ssh, &msg, NULL)) != 0 ||
3158: (r = sshpkt_get_string_direct(ssh, NULL, NULL)) != 0) {
3159: error("%s: message/lang: %s", __func__, ssh_err(r));
3160: packet_disconnect("Invalid open failure message");
1.358 djm 3161: }
1.367 djm 3162: ssh_packet_check_eom(ssh);
3163: logit("channel %d: open failed: %s%s%s", c->self,
1.358 djm 3164: reason2txt(reason), msg ? ": ": "", msg ? msg : "");
3165: free(msg);
3166: if (c->open_confirm) {
1.367 djm 3167: debug2("%s: channel %d: callback start", __func__, c->self);
3168: c->open_confirm(ssh, c->self, 0, c->open_confirm_ctx);
3169: debug2("%s: channel %d: callback done", __func__, c->self);
1.44 markus 3170: }
1.291 djm 3171: /* Schedule the channel for cleanup/deletion. */
1.367 djm 3172: chan_mark_dead(ssh, c);
1.339 markus 3173: return 0;
1.44 markus 3174: }
3175:
1.339 markus 3176: int
1.363 markus 3177: channel_input_window_adjust(int type, u_int32_t seq, struct ssh *ssh)
1.121 markus 3178: {
1.367 djm 3179: int id = channel_parse_id(ssh, __func__, "window adjust");
1.121 markus 3180: Channel *c;
1.367 djm 3181: u_int32_t adjust;
3182: u_int new_rwin;
3183: int r;
1.1 deraadt 3184:
1.367 djm 3185: if ((c = channel_lookup(ssh, id)) == NULL) {
1.229 markus 3186: logit("Received window adjust for non-open channel %d.", id);
1.339 markus 3187: return 0;
1.372 markus 3188: }
1.367 djm 3189:
1.363 markus 3190: if (channel_proxy_upstream(c, type, seq, ssh))
1.354 markus 3191: return 0;
1.367 djm 3192: if ((r = sshpkt_get_u32(ssh, &adjust)) != 0) {
3193: error("%s: adjust: %s", __func__, ssh_err(r));
3194: packet_disconnect("Invalid window adjust message");
3195: }
3196: ssh_packet_check_eom(ssh);
3197: debug2("channel %d: rcvd adjust %u", c->self, adjust);
3198: if ((new_rwin = c->remote_window + adjust) < c->remote_window) {
1.346 djm 3199: fatal("channel %d: adjust %u overflows remote window %u",
1.367 djm 3200: c->self, adjust, c->remote_window);
3201: }
3202: c->remote_window = new_rwin;
1.339 markus 3203: return 0;
1.121 markus 3204: }
1.1 deraadt 3205:
1.339 markus 3206: int
1.363 markus 3207: channel_input_status_confirm(int type, u_int32_t seq, struct ssh *ssh)
1.275 djm 3208: {
1.367 djm 3209: int id = channel_parse_id(ssh, __func__, "status confirm");
1.275 djm 3210: Channel *c;
3211: struct channel_confirm *cc;
3212:
3213: /* Reset keepalive timeout */
1.296 andreas 3214: packet_set_alive_timeouts(0);
1.275 djm 3215:
1.367 djm 3216: debug2("%s: type %d id %d", __func__, type, id);
1.275 djm 3217:
1.367 djm 3218: if ((c = channel_lookup(ssh, id)) == NULL) {
3219: logit("%s: %d: unknown", __func__, id);
1.339 markus 3220: return 0;
1.367 djm 3221: }
1.363 markus 3222: if (channel_proxy_upstream(c, type, seq, ssh))
1.354 markus 3223: return 0;
1.367 djm 3224: ssh_packet_check_eom(ssh);
1.275 djm 3225: if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL)
1.339 markus 3226: return 0;
1.367 djm 3227: cc->cb(ssh, type, c, cc->ctx);
1.275 djm 3228: TAILQ_REMOVE(&c->status_confirms, cc, entry);
1.329 tedu 3229: explicit_bzero(cc, sizeof(*cc));
1.321 djm 3230: free(cc);
1.339 markus 3231: return 0;
1.275 djm 3232: }
1.121 markus 3233:
3234: /* -- tcp forwarding */
1.135 markus 3235:
3236: void
1.367 djm 3237: channel_set_af(struct ssh *ssh, int af)
1.135 markus 3238: {
1.367 djm 3239: ssh->chanctxt->IPv4or6 = af;
1.135 markus 3240: }
1.121 markus 3241:
1.312 djm 3242:
3243: /*
3244: * Determine whether or not a port forward listens to loopback, the
3245: * specified address or wildcard. On the client, a specified bind
3246: * address will always override gateway_ports. On the server, a
3247: * gateway_ports of 1 (``yes'') will override the client's specification
3248: * and force a wildcard bind, whereas a value of 2 (``clientspecified'')
3249: * will bind to whatever address the client asked for.
3250: *
3251: * Special-case listen_addrs are:
3252: *
3253: * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR
3254: * "" (empty string), "*" -> wildcard v4/v6
3255: * "localhost" -> loopback v4/v6
1.334 djm 3256: * "127.0.0.1" / "::1" -> accepted even if gateway_ports isn't set
1.312 djm 3257: */
3258: static const char *
3259: channel_fwd_bind_addr(const char *listen_addr, int *wildcardp,
1.336 millert 3260: int is_client, struct ForwardOptions *fwd_opts)
1.312 djm 3261: {
3262: const char *addr = NULL;
3263: int wildcard = 0;
3264:
3265: if (listen_addr == NULL) {
3266: /* No address specified: default to gateway_ports setting */
1.336 millert 3267: if (fwd_opts->gateway_ports)
1.312 djm 3268: wildcard = 1;
1.336 millert 3269: } else if (fwd_opts->gateway_ports || is_client) {
1.312 djm 3270: if (((datafellows & SSH_OLD_FORWARD_ADDR) &&
3271: strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) ||
3272: *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 ||
1.336 millert 3273: (!is_client && fwd_opts->gateway_ports == 1)) {
1.312 djm 3274: wildcard = 1;
1.326 djm 3275: /*
3276: * Notify client if they requested a specific listen
3277: * address and it was overridden.
3278: */
3279: if (*listen_addr != '\0' &&
3280: strcmp(listen_addr, "0.0.0.0") != 0 &&
3281: strcmp(listen_addr, "*") != 0) {
3282: packet_send_debug("Forwarding listen address "
3283: "\"%s\" overridden by server "
3284: "GatewayPorts", listen_addr);
3285: }
1.334 djm 3286: } else if (strcmp(listen_addr, "localhost") != 0 ||
3287: strcmp(listen_addr, "127.0.0.1") == 0 ||
3288: strcmp(listen_addr, "::1") == 0) {
3289: /* Accept localhost address when GatewayPorts=yes */
3290: addr = listen_addr;
1.326 djm 3291: }
1.334 djm 3292: } else if (strcmp(listen_addr, "127.0.0.1") == 0 ||
3293: strcmp(listen_addr, "::1") == 0) {
3294: /*
3295: * If a specific IPv4/IPv6 localhost address has been
3296: * requested then accept it even if gateway_ports is in
3297: * effect. This allows the client to prefer IPv4 or IPv6.
3298: */
3299: addr = listen_addr;
1.312 djm 3300: }
3301: if (wildcardp != NULL)
3302: *wildcardp = wildcard;
3303: return addr;
3304: }
3305:
1.160 markus 3306: static int
1.367 djm 3307: channel_setup_fwd_listener_tcpip(struct ssh *ssh, int type,
3308: struct Forward *fwd, int *allocated_listen_port,
3309: struct ForwardOptions *fwd_opts)
1.25 markus 3310: {
1.113 markus 3311: Channel *c;
1.226 djm 3312: int sock, r, success = 0, wildcard = 0, is_client;
1.35 markus 3313: struct addrinfo hints, *ai, *aitop;
1.212 djm 3314: const char *host, *addr;
1.35 markus 3315: char ntop[NI_MAXHOST], strport[NI_MAXSERV];
1.295 djm 3316: in_port_t *lport_p;
1.25 markus 3317:
1.212 djm 3318: is_client = (type == SSH_CHANNEL_PORT_LISTENER);
1.87 markus 3319:
1.344 millert 3320: if (is_client && fwd->connect_path != NULL) {
3321: host = fwd->connect_path;
3322: } else {
3323: host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
3324: fwd->listen_host : fwd->connect_host;
3325: if (host == NULL) {
3326: error("No forward host name.");
3327: return 0;
3328: }
3329: if (strlen(host) >= NI_MAXHOST) {
3330: error("Forward host name too long.");
3331: return 0;
3332: }
1.87 markus 3333: }
1.25 markus 3334:
1.312 djm 3335: /* Determine the bind address, cf. channel_fwd_bind_addr() comment */
1.336 millert 3336: addr = channel_fwd_bind_addr(fwd->listen_host, &wildcard,
3337: is_client, fwd_opts);
3338: debug3("%s: type %d wildcard %d addr %s", __func__,
1.212 djm 3339: type, wildcard, (addr == NULL) ? "NULL" : addr);
3340:
3341: /*
1.35 markus 3342: * getaddrinfo returns a loopback address if the hostname is
3343: * set to NULL and hints.ai_flags is not AI_PASSIVE
1.28 markus 3344: */
1.35 markus 3345: memset(&hints, 0, sizeof(hints));
1.367 djm 3346: hints.ai_family = ssh->chanctxt->IPv4or6;
1.212 djm 3347: hints.ai_flags = wildcard ? AI_PASSIVE : 0;
1.35 markus 3348: hints.ai_socktype = SOCK_STREAM;
1.336 millert 3349: snprintf(strport, sizeof strport, "%d", fwd->listen_port);
1.212 djm 3350: if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) {
3351: if (addr == NULL) {
3352: /* This really shouldn't happen */
3353: packet_disconnect("getaddrinfo: fatal error: %s",
1.271 dtucker 3354: ssh_gai_strerror(r));
1.212 djm 3355: } else {
1.336 millert 3356: error("%s: getaddrinfo(%.64s): %s", __func__, addr,
1.271 dtucker 3357: ssh_gai_strerror(r));
1.212 djm 3358: }
1.218 markus 3359: return 0;
1.212 djm 3360: }
1.295 djm 3361: if (allocated_listen_port != NULL)
3362: *allocated_listen_port = 0;
1.35 markus 3363: for (ai = aitop; ai; ai = ai->ai_next) {
1.295 djm 3364: switch (ai->ai_family) {
3365: case AF_INET:
3366: lport_p = &((struct sockaddr_in *)ai->ai_addr)->
3367: sin_port;
3368: break;
3369: case AF_INET6:
3370: lport_p = &((struct sockaddr_in6 *)ai->ai_addr)->
3371: sin6_port;
3372: break;
3373: default:
1.35 markus 3374: continue;
1.295 djm 3375: }
3376: /*
3377: * If allocating a port for -R forwards, then use the
3378: * same port for all address families.
3379: */
1.367 djm 3380: if (type == SSH_CHANNEL_RPORT_LISTENER &&
3381: fwd->listen_port == 0 && allocated_listen_port != NULL &&
3382: *allocated_listen_port > 0)
1.295 djm 3383: *lport_p = htons(*allocated_listen_port);
3384:
1.35 markus 3385: if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
1.367 djm 3386: strport, sizeof(strport),
3387: NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1.336 millert 3388: error("%s: getnameinfo failed", __func__);
1.35 markus 3389: continue;
3390: }
3391: /* Create a port to listen for the host. */
1.300 dtucker 3392: sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.35 markus 3393: if (sock < 0) {
3394: /* this is no error since kernel may not support ipv6 */
1.377 djm 3395: verbose("socket [%s]:%s: %.100s", ntop, strport,
3396: strerror(errno));
1.35 markus 3397: continue;
3398: }
1.226 djm 3399:
1.376 djm 3400: set_reuseaddr(sock);
1.182 stevesk 3401:
1.295 djm 3402: debug("Local forwarding listening on %s port %s.",
3403: ntop, strport);
1.35 markus 3404:
3405: /* Bind the socket to the address. */
3406: if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1.367 djm 3407: /*
3408: * address can be in if use ipv6 address is
3409: * already bound
3410: */
1.377 djm 3411: verbose("bind [%s]:%s: %.100s",
3412: ntop, strport, strerror(errno));
1.35 markus 3413: close(sock);
3414: continue;
3415: }
3416: /* Start listening for connections on the socket. */
1.199 markus 3417: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.377 djm 3418: error("listen [%s]:%s: %.100s", ntop, strport,
3419: strerror(errno));
1.35 markus 3420: close(sock);
3421: continue;
3422: }
1.295 djm 3423:
3424: /*
1.336 millert 3425: * fwd->listen_port == 0 requests a dynamically allocated port -
1.295 djm 3426: * record what we got.
3427: */
1.367 djm 3428: if (type == SSH_CHANNEL_RPORT_LISTENER &&
3429: fwd->listen_port == 0 &&
1.295 djm 3430: allocated_listen_port != NULL &&
3431: *allocated_listen_port == 0) {
1.350 djm 3432: *allocated_listen_port = get_local_port(sock);
1.295 djm 3433: debug("Allocated listen port %d",
3434: *allocated_listen_port);
3435: }
3436:
1.35 markus 3437: /* Allocate a channel number for the socket. */
1.367 djm 3438: c = channel_new(ssh, "port listener", type, sock, sock, -1,
1.51 markus 3439: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1.190 markus 3440: 0, "port listener", 1);
1.293 djm 3441: c->path = xstrdup(host);
1.336 millert 3442: c->host_port = fwd->connect_port;
1.312 djm 3443: c->listening_addr = addr == NULL ? NULL : xstrdup(addr);
1.336 millert 3444: if (fwd->listen_port == 0 && allocated_listen_port != NULL &&
1.315 markus 3445: !(datafellows & SSH_BUG_DYNAMIC_RPORT))
3446: c->listening_port = *allocated_listen_port;
3447: else
1.336 millert 3448: c->listening_port = fwd->listen_port;
1.35 markus 3449: success = 1;
3450: }
3451: if (success == 0)
1.336 millert 3452: error("%s: cannot listen to port: %d", __func__,
3453: fwd->listen_port);
1.35 markus 3454: freeaddrinfo(aitop);
1.87 markus 3455: return success;
1.25 markus 3456: }
1.1 deraadt 3457:
1.336 millert 3458: static int
1.367 djm 3459: channel_setup_fwd_listener_streamlocal(struct ssh *ssh, int type,
3460: struct Forward *fwd, struct ForwardOptions *fwd_opts)
1.336 millert 3461: {
3462: struct sockaddr_un sunaddr;
3463: const char *path;
3464: Channel *c;
3465: int port, sock;
3466: mode_t omask;
3467:
3468: switch (type) {
3469: case SSH_CHANNEL_UNIX_LISTENER:
3470: if (fwd->connect_path != NULL) {
3471: if (strlen(fwd->connect_path) > sizeof(sunaddr.sun_path)) {
3472: error("Local connecting path too long: %s",
3473: fwd->connect_path);
3474: return 0;
3475: }
3476: path = fwd->connect_path;
3477: port = PORT_STREAMLOCAL;
3478: } else {
3479: if (fwd->connect_host == NULL) {
3480: error("No forward host name.");
3481: return 0;
3482: }
3483: if (strlen(fwd->connect_host) >= NI_MAXHOST) {
3484: error("Forward host name too long.");
3485: return 0;
3486: }
3487: path = fwd->connect_host;
3488: port = fwd->connect_port;
3489: }
3490: break;
3491: case SSH_CHANNEL_RUNIX_LISTENER:
3492: path = fwd->listen_path;
3493: port = PORT_STREAMLOCAL;
3494: break;
3495: default:
3496: error("%s: unexpected channel type %d", __func__, type);
3497: return 0;
3498: }
3499:
3500: if (fwd->listen_path == NULL) {
3501: error("No forward path name.");
3502: return 0;
3503: }
3504: if (strlen(fwd->listen_path) > sizeof(sunaddr.sun_path)) {
3505: error("Local listening path too long: %s", fwd->listen_path);
3506: return 0;
3507: }
3508:
3509: debug3("%s: type %d path %s", __func__, type, fwd->listen_path);
3510:
3511: /* Start a Unix domain listener. */
3512: omask = umask(fwd_opts->streamlocal_bind_mask);
3513: sock = unix_listener(fwd->listen_path, SSH_LISTEN_BACKLOG,
3514: fwd_opts->streamlocal_bind_unlink);
3515: umask(omask);
3516: if (sock < 0)
3517: return 0;
3518:
3519: debug("Local forwarding listening on path %s.", fwd->listen_path);
3520:
3521: /* Allocate a channel number for the socket. */
1.367 djm 3522: c = channel_new(ssh, "unix listener", type, sock, sock, -1,
1.336 millert 3523: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
3524: 0, "unix listener", 1);
3525: c->path = xstrdup(path);
3526: c->host_port = port;
3527: c->listening_port = PORT_STREAMLOCAL;
3528: c->listening_addr = xstrdup(fwd->listen_path);
3529: return 1;
3530: }
3531:
3532: static int
1.367 djm 3533: channel_cancel_rport_listener_tcpip(struct ssh *ssh,
3534: const char *host, u_short port)
1.202 djm 3535: {
1.209 avsm 3536: u_int i;
3537: int found = 0;
1.202 djm 3538:
1.367 djm 3539: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
3540: Channel *c = ssh->chanctxt->channels[i];
1.312 djm 3541: if (c == NULL || c->type != SSH_CHANNEL_RPORT_LISTENER)
3542: continue;
3543: if (strcmp(c->path, host) == 0 && c->listening_port == port) {
3544: debug2("%s: close channel %d", __func__, i);
1.367 djm 3545: channel_free(ssh, c);
1.312 djm 3546: found = 1;
3547: }
3548: }
3549:
1.367 djm 3550: return found;
1.312 djm 3551: }
3552:
1.336 millert 3553: static int
1.367 djm 3554: channel_cancel_rport_listener_streamlocal(struct ssh *ssh, const char *path)
1.336 millert 3555: {
3556: u_int i;
3557: int found = 0;
3558:
1.367 djm 3559: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
3560: Channel *c = ssh->chanctxt->channels[i];
1.336 millert 3561: if (c == NULL || c->type != SSH_CHANNEL_RUNIX_LISTENER)
3562: continue;
3563: if (c->path == NULL)
3564: continue;
3565: if (strcmp(c->path, path) == 0) {
3566: debug2("%s: close channel %d", __func__, i);
1.367 djm 3567: channel_free(ssh, c);
1.336 millert 3568: found = 1;
3569: }
3570: }
3571:
1.367 djm 3572: return found;
1.336 millert 3573: }
3574:
1.312 djm 3575: int
1.367 djm 3576: channel_cancel_rport_listener(struct ssh *ssh, struct Forward *fwd)
1.336 millert 3577: {
1.367 djm 3578: if (fwd->listen_path != NULL) {
3579: return channel_cancel_rport_listener_streamlocal(ssh,
3580: fwd->listen_path);
3581: } else {
3582: return channel_cancel_rport_listener_tcpip(ssh,
3583: fwd->listen_host, fwd->listen_port);
3584: }
1.336 millert 3585: }
3586:
3587: static int
1.367 djm 3588: channel_cancel_lport_listener_tcpip(struct ssh *ssh,
3589: const char *lhost, u_short lport, int cport,
3590: struct ForwardOptions *fwd_opts)
1.312 djm 3591: {
3592: u_int i;
3593: int found = 0;
1.336 millert 3594: const char *addr = channel_fwd_bind_addr(lhost, NULL, 1, fwd_opts);
1.202 djm 3595:
1.367 djm 3596: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
3597: Channel *c = ssh->chanctxt->channels[i];
1.312 djm 3598: if (c == NULL || c->type != SSH_CHANNEL_PORT_LISTENER)
3599: continue;
1.313 markus 3600: if (c->listening_port != lport)
1.312 djm 3601: continue;
1.313 markus 3602: if (cport == CHANNEL_CANCEL_PORT_STATIC) {
3603: /* skip dynamic forwardings */
3604: if (c->host_port == 0)
3605: continue;
3606: } else {
3607: if (c->host_port != cport)
3608: continue;
3609: }
1.312 djm 3610: if ((c->listening_addr == NULL && addr != NULL) ||
3611: (c->listening_addr != NULL && addr == NULL))
3612: continue;
3613: if (addr == NULL || strcmp(c->listening_addr, addr) == 0) {
1.210 djm 3614: debug2("%s: close channel %d", __func__, i);
1.367 djm 3615: channel_free(ssh, c);
1.202 djm 3616: found = 1;
3617: }
3618: }
3619:
1.367 djm 3620: return found;
1.202 djm 3621: }
3622:
1.336 millert 3623: static int
1.367 djm 3624: channel_cancel_lport_listener_streamlocal(struct ssh *ssh, const char *path)
1.336 millert 3625: {
3626: u_int i;
3627: int found = 0;
3628:
3629: if (path == NULL) {
3630: error("%s: no path specified.", __func__);
3631: return 0;
3632: }
3633:
1.367 djm 3634: for (i = 0; i < ssh->chanctxt->channels_alloc; i++) {
3635: Channel *c = ssh->chanctxt->channels[i];
1.336 millert 3636: if (c == NULL || c->type != SSH_CHANNEL_UNIX_LISTENER)
3637: continue;
3638: if (c->listening_addr == NULL)
3639: continue;
3640: if (strcmp(c->listening_addr, path) == 0) {
3641: debug2("%s: close channel %d", __func__, i);
1.367 djm 3642: channel_free(ssh, c);
1.336 millert 3643: found = 1;
3644: }
3645: }
3646:
1.367 djm 3647: return found;
1.336 millert 3648: }
3649:
3650: int
1.367 djm 3651: channel_cancel_lport_listener(struct ssh *ssh,
3652: struct Forward *fwd, int cport, struct ForwardOptions *fwd_opts)
1.336 millert 3653: {
1.367 djm 3654: if (fwd->listen_path != NULL) {
3655: return channel_cancel_lport_listener_streamlocal(ssh,
3656: fwd->listen_path);
3657: } else {
3658: return channel_cancel_lport_listener_tcpip(ssh,
3659: fwd->listen_host, fwd->listen_port, cport, fwd_opts);
3660: }
1.336 millert 3661: }
3662:
1.362 markus 3663: /* protocol local port fwd, used by ssh */
1.160 markus 3664: int
1.367 djm 3665: channel_setup_local_fwd_listener(struct ssh *ssh,
3666: struct Forward *fwd, struct ForwardOptions *fwd_opts)
1.160 markus 3667: {
1.336 millert 3668: if (fwd->listen_path != NULL) {
1.367 djm 3669: return channel_setup_fwd_listener_streamlocal(ssh,
1.336 millert 3670: SSH_CHANNEL_UNIX_LISTENER, fwd, fwd_opts);
3671: } else {
1.367 djm 3672: return channel_setup_fwd_listener_tcpip(ssh,
3673: SSH_CHANNEL_PORT_LISTENER, fwd, NULL, fwd_opts);
1.336 millert 3674: }
1.160 markus 3675: }
3676:
1.381 djm 3677: /* Matches a remote forwarding permission against a requested forwarding */
3678: static int
3679: remote_open_match(struct permission *allowed_open, struct Forward *fwd)
3680: {
3681: int ret;
3682: char *lhost;
3683:
3684: /* XXX add ACLs for streamlocal */
3685: if (fwd->listen_path != NULL)
3686: return 1;
3687:
3688: if (fwd->listen_host == NULL || allowed_open->listen_host == NULL)
3689: return 0;
3690:
3691: if (allowed_open->listen_port != FWD_PERMIT_ANY_PORT &&
3692: allowed_open->listen_port != fwd->listen_port)
3693: return 0;
3694:
3695: /* Match hostnames case-insensitively */
3696: lhost = xstrdup(fwd->listen_host);
3697: lowercase(lhost);
3698: ret = match_pattern(lhost, allowed_open->listen_host);
3699: free(lhost);
3700:
3701: return ret;
3702: }
3703:
3704: /* Checks whether a requested remote forwarding is permitted */
3705: static int
3706: check_rfwd_permission(struct ssh *ssh, struct Forward *fwd)
3707: {
3708: struct ssh_channels *sc = ssh->chanctxt;
3709: struct permission_set *pset = &sc->remote_perms;
3710: u_int i, permit, permit_adm = 1;
3711: struct permission *perm;
3712:
3713: /* XXX apply GatewayPorts override before checking? */
3714:
3715: permit = pset->all_permitted;
3716: if (!permit) {
3717: for (i = 0; i < pset->num_permitted_user; i++) {
3718: perm = &pset->permitted_user[i];
3719: if (remote_open_match(perm, fwd)) {
3720: permit = 1;
3721: break;
3722: }
3723: }
3724: }
3725:
3726: if (pset->num_permitted_admin > 0) {
3727: permit_adm = 0;
3728: for (i = 0; i < pset->num_permitted_admin; i++) {
3729: perm = &pset->permitted_admin[i];
3730: if (remote_open_match(perm, fwd)) {
3731: permit_adm = 1;
3732: break;
3733: }
3734: }
3735: }
3736:
3737: return permit && permit_adm;
3738: }
3739:
1.160 markus 3740: /* protocol v2 remote port fwd, used by sshd */
3741: int
1.367 djm 3742: channel_setup_remote_fwd_listener(struct ssh *ssh, struct Forward *fwd,
1.336 millert 3743: int *allocated_listen_port, struct ForwardOptions *fwd_opts)
1.160 markus 3744: {
1.381 djm 3745: if (!check_rfwd_permission(ssh, fwd)) {
3746: packet_send_debug("port forwarding refused");
3747: return 0;
3748: }
1.336 millert 3749: if (fwd->listen_path != NULL) {
1.367 djm 3750: return channel_setup_fwd_listener_streamlocal(ssh,
1.336 millert 3751: SSH_CHANNEL_RUNIX_LISTENER, fwd, fwd_opts);
3752: } else {
1.367 djm 3753: return channel_setup_fwd_listener_tcpip(ssh,
1.336 millert 3754: SSH_CHANNEL_RPORT_LISTENER, fwd, allocated_listen_port,
3755: fwd_opts);
3756: }
1.160 markus 3757: }
3758:
1.27 markus 3759: /*
1.312 djm 3760: * Translate the requested rfwd listen host to something usable for
3761: * this server.
3762: */
3763: static const char *
3764: channel_rfwd_bind_host(const char *listen_host)
3765: {
3766: if (listen_host == NULL) {
1.378 djm 3767: return "localhost";
1.312 djm 3768: } else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) {
1.378 djm 3769: return "";
1.312 djm 3770: } else
3771: return listen_host;
3772: }
3773:
3774: /*
1.27 markus 3775: * Initiate forwarding of connections to port "port" on remote host through
3776: * the secure channel to host:port from local side.
1.315 markus 3777: * Returns handle (index) for updating the dynamic listen port with
1.381 djm 3778: * channel_update_permission().
1.27 markus 3779: */
1.253 markus 3780: int
1.367 djm 3781: channel_request_remote_forwarding(struct ssh *ssh, struct Forward *fwd)
1.25 markus 3782: {
1.367 djm 3783: int r, success = 0, idx = -1;
3784: char *host_to_connect, *listen_host, *listen_path;
3785: int port_to_connect, listen_port;
1.73 markus 3786:
1.25 markus 3787: /* Send the forward request to the remote side. */
1.358 djm 3788: if (fwd->listen_path != NULL) {
1.367 djm 3789: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
3790: (r = sshpkt_put_cstring(ssh,
3791: "streamlocal-forward@openssh.com")) != 0 ||
3792: (r = sshpkt_put_u8(ssh, 1)) != 0 || /* want reply */
3793: (r = sshpkt_put_cstring(ssh, fwd->listen_path)) != 0 ||
3794: (r = sshpkt_send(ssh)) != 0 ||
3795: (r = ssh_packet_write_wait(ssh)) != 0)
3796: fatal("%s: request streamlocal: %s",
3797: __func__, ssh_err(r));
1.336 millert 3798: } else {
1.367 djm 3799: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
3800: (r = sshpkt_put_cstring(ssh, "tcpip-forward")) != 0 ||
3801: (r = sshpkt_put_u8(ssh, 1)) != 0 || /* want reply */
3802: (r = sshpkt_put_cstring(ssh,
3803: channel_rfwd_bind_host(fwd->listen_host))) != 0 ||
3804: (r = sshpkt_put_u32(ssh, fwd->listen_port)) != 0 ||
3805: (r = sshpkt_send(ssh)) != 0 ||
3806: (r = ssh_packet_write_wait(ssh)) != 0)
3807: fatal("%s: request tcpip-forward: %s",
3808: __func__, ssh_err(r));
1.73 markus 3809: }
1.358 djm 3810: /* Assume that server accepts the request */
3811: success = 1;
1.73 markus 3812: if (success) {
1.305 djm 3813: /* Record that connection to this host/port is permitted. */
1.367 djm 3814: host_to_connect = listen_host = listen_path = NULL;
3815: port_to_connect = listen_port = 0;
1.336 millert 3816: if (fwd->connect_path != NULL) {
1.367 djm 3817: host_to_connect = xstrdup(fwd->connect_path);
3818: port_to_connect = PORT_STREAMLOCAL;
1.336 millert 3819: } else {
1.367 djm 3820: host_to_connect = xstrdup(fwd->connect_host);
3821: port_to_connect = fwd->connect_port;
1.336 millert 3822: }
3823: if (fwd->listen_path != NULL) {
1.367 djm 3824: listen_path = xstrdup(fwd->listen_path);
3825: listen_port = PORT_STREAMLOCAL;
1.336 millert 3826: } else {
1.367 djm 3827: if (fwd->listen_host != NULL)
3828: listen_host = xstrdup(fwd->listen_host);
3829: listen_port = fwd->listen_port;
3830: }
1.381 djm 3831: idx = permission_set_add(ssh, FORWARD_USER, FORWARD_LOCAL,
1.367 djm 3832: host_to_connect, port_to_connect,
3833: listen_host, listen_path, listen_port, NULL);
1.44 markus 3834: }
1.367 djm 3835: return idx;
1.1 deraadt 3836: }
3837:
1.333 markus 3838: static int
1.381 djm 3839: open_match(struct permission *allowed_open, const char *requestedhost,
1.336 millert 3840: int requestedport)
1.333 markus 3841: {
3842: if (allowed_open->host_to_connect == NULL)
3843: return 0;
3844: if (allowed_open->port_to_connect != FWD_PERMIT_ANY_PORT &&
3845: allowed_open->port_to_connect != requestedport)
3846: return 0;
1.351 dtucker 3847: if (strcmp(allowed_open->host_to_connect, FWD_PERMIT_ANY_HOST) != 0 &&
3848: strcmp(allowed_open->host_to_connect, requestedhost) != 0)
1.333 markus 3849: return 0;
3850: return 1;
3851: }
3852:
3853: /*
1.336 millert 3854: * Note that in the listen host/port case
1.333 markus 3855: * we don't support FWD_PERMIT_ANY_PORT and
3856: * need to translate between the configured-host (listen_host)
3857: * and what we've sent to the remote server (channel_rfwd_bind_host)
3858: */
3859: static int
1.381 djm 3860: open_listen_match_tcpip(struct permission *allowed_open,
1.336 millert 3861: const char *requestedhost, u_short requestedport, int translate)
1.333 markus 3862: {
3863: const char *allowed_host;
3864:
3865: if (allowed_open->host_to_connect == NULL)
3866: return 0;
3867: if (allowed_open->listen_port != requestedport)
3868: return 0;
1.335 djm 3869: if (!translate && allowed_open->listen_host == NULL &&
3870: requestedhost == NULL)
3871: return 1;
1.333 markus 3872: allowed_host = translate ?
3873: channel_rfwd_bind_host(allowed_open->listen_host) :
3874: allowed_open->listen_host;
1.382 djm 3875: if (allowed_host == NULL || requestedhost == NULL ||
1.333 markus 3876: strcmp(allowed_host, requestedhost) != 0)
3877: return 0;
3878: return 1;
3879: }
3880:
1.336 millert 3881: static int
1.381 djm 3882: open_listen_match_streamlocal(struct permission *allowed_open,
1.336 millert 3883: const char *requestedpath)
3884: {
3885: if (allowed_open->host_to_connect == NULL)
3886: return 0;
3887: if (allowed_open->listen_port != PORT_STREAMLOCAL)
3888: return 0;
3889: if (allowed_open->listen_path == NULL ||
3890: strcmp(allowed_open->listen_path, requestedpath) != 0)
3891: return 0;
3892: return 1;
3893: }
3894:
1.27 markus 3895: /*
1.208 deraadt 3896: * Request cancellation of remote forwarding of connection host:port from
1.202 djm 3897: * local side.
3898: */
1.336 millert 3899: static int
1.367 djm 3900: channel_request_rforward_cancel_tcpip(struct ssh *ssh,
3901: const char *host, u_short port)
1.202 djm 3902: {
1.367 djm 3903: struct ssh_channels *sc = ssh->chanctxt;
1.381 djm 3904: struct permission_set *pset = &sc->local_perms;
1.367 djm 3905: int r;
3906: u_int i;
1.381 djm 3907: struct permission *perm;
1.202 djm 3908:
1.381 djm 3909: for (i = 0; i < pset->num_permitted_user; i++) {
3910: perm = &pset->permitted_user[i];
3911: if (open_listen_match_tcpip(perm, host, port, 0))
1.202 djm 3912: break;
1.381 djm 3913: perm = NULL;
1.202 djm 3914: }
1.381 djm 3915: if (perm == NULL) {
1.202 djm 3916: debug("%s: requested forward not found", __func__);
1.312 djm 3917: return -1;
1.202 djm 3918: }
1.367 djm 3919: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
3920: (r = sshpkt_put_cstring(ssh, "cancel-tcpip-forward")) != 0 ||
3921: (r = sshpkt_put_u8(ssh, 0)) != 0 || /* want reply */
3922: (r = sshpkt_put_cstring(ssh, channel_rfwd_bind_host(host))) != 0 ||
3923: (r = sshpkt_put_u32(ssh, port)) != 0 ||
3924: (r = sshpkt_send(ssh)) != 0)
3925: fatal("%s: send cancel: %s", __func__, ssh_err(r));
3926:
1.381 djm 3927: fwd_perm_clear(perm); /* unregister */
1.336 millert 3928:
3929: return 0;
3930: }
3931:
3932: /*
3933: * Request cancellation of remote forwarding of Unix domain socket
3934: * path from local side.
3935: */
3936: static int
1.367 djm 3937: channel_request_rforward_cancel_streamlocal(struct ssh *ssh, const char *path)
1.336 millert 3938: {
1.367 djm 3939: struct ssh_channels *sc = ssh->chanctxt;
1.381 djm 3940: struct permission_set *pset = &sc->local_perms;
1.367 djm 3941: int r;
3942: u_int i;
1.381 djm 3943: struct permission *perm;
1.336 millert 3944:
1.381 djm 3945: for (i = 0; i < pset->num_permitted_user; i++) {
3946: perm = &pset->permitted_user[i];
3947: if (open_listen_match_streamlocal(perm, path))
1.336 millert 3948: break;
1.381 djm 3949: perm = NULL;
1.336 millert 3950: }
1.381 djm 3951: if (perm == NULL) {
1.336 millert 3952: debug("%s: requested forward not found", __func__);
3953: return -1;
3954: }
1.367 djm 3955: if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
3956: (r = sshpkt_put_cstring(ssh,
3957: "cancel-streamlocal-forward@openssh.com")) != 0 ||
3958: (r = sshpkt_put_u8(ssh, 0)) != 0 || /* want reply */
3959: (r = sshpkt_put_cstring(ssh, path)) != 0 ||
3960: (r = sshpkt_send(ssh)) != 0)
3961: fatal("%s: send cancel: %s", __func__, ssh_err(r));
3962:
1.381 djm 3963: fwd_perm_clear(perm); /* unregister */
1.312 djm 3964:
3965: return 0;
1.202 djm 3966: }
3967:
3968: /*
1.336 millert 3969: * Request cancellation of remote forwarding of a connection from local side.
3970: */
3971: int
1.367 djm 3972: channel_request_rforward_cancel(struct ssh *ssh, struct Forward *fwd)
1.336 millert 3973: {
3974: if (fwd->listen_path != NULL) {
1.367 djm 3975: return channel_request_rforward_cancel_streamlocal(ssh,
3976: fwd->listen_path);
1.336 millert 3977: } else {
1.367 djm 3978: return channel_request_rforward_cancel_tcpip(ssh,
3979: fwd->listen_host,
3980: fwd->listen_port ? fwd->listen_port : fwd->allocated_port);
1.336 millert 3981: }
1.1 deraadt 3982: }
3983:
1.99 markus 3984: /*
1.381 djm 3985: * Permits opening to any host/port if permitted_user[] is empty. This is
1.99 markus 3986: * usually called by the server, because the user could connect to any port
3987: * anyway, and the server has no way to know but to trust the client anyway.
3988: */
3989: void
1.381 djm 3990: channel_permit_all(struct ssh *ssh, int where)
3991: {
3992: struct permission_set *pset = permission_set_get(ssh, where);
3993:
3994: if (pset->num_permitted_user == 0)
3995: pset->all_permitted = 1;
3996: }
3997:
3998: /*
3999: * Permit the specified host/port for forwarding.
4000: */
4001: void
4002: channel_add_permission(struct ssh *ssh, int who, int where,
4003: char *host, int port)
4004: {
4005: int local = where == FORWARD_LOCAL;
4006: struct permission_set *pset = permission_set_get(ssh, where);
4007:
4008: debug("allow %s forwarding to host %s port %d",
4009: fwd_ident(who, where), host, port);
4010: /*
4011: * Remote forwards set listen_host/port, local forwards set
4012: * host/port_to_connect.
4013: */
4014: permission_set_add(ssh, who, where,
4015: local ? host : 0, local ? port : 0,
4016: local ? NULL : host, NULL, local ? 0 : port, NULL);
4017: pset->all_permitted = 0;
4018: }
4019:
4020: /*
4021: * Administratively disable forwarding.
4022: */
4023: void
4024: channel_disable_admin(struct ssh *ssh, int where)
1.99 markus 4025: {
1.381 djm 4026: channel_clear_permission(ssh, FORWARD_ADM, where);
4027: permission_set_add(ssh, FORWARD_ADM, where,
4028: NULL, 0, NULL, NULL, 0, NULL);
1.99 markus 4029: }
4030:
1.381 djm 4031: /*
4032: * Clear a list of permitted opens.
4033: */
1.101 markus 4034: void
1.381 djm 4035: channel_clear_permission(struct ssh *ssh, int who, int where)
1.99 markus 4036: {
1.381 djm 4037: struct permission **permp;
4038: u_int *npermp;
1.367 djm 4039:
1.381 djm 4040: permission_set_get_array(ssh, who, where, &permp, &npermp);
4041: *permp = xrecallocarray(*permp, *npermp, 0, sizeof(**permp));
4042: *npermp = 0;
1.315 markus 4043: }
4044:
4045: /*
4046: * Update the listen port for a dynamic remote forward, after
4047: * the actual 'newport' has been allocated. If 'newport' < 0 is
4048: * passed then they entry will be invalidated.
4049: */
4050: void
1.381 djm 4051: channel_update_permission(struct ssh *ssh, int idx, int newport)
1.315 markus 4052: {
1.381 djm 4053: struct permission_set *pset = &ssh->chanctxt->local_perms;
1.367 djm 4054:
1.381 djm 4055: if (idx < 0 || (u_int)idx >= pset->num_permitted_user) {
4056: debug("%s: index out of range: %d num_permitted_user %d",
4057: __func__, idx, pset->num_permitted_user);
1.315 markus 4058: return;
4059: }
4060: debug("%s allowed port %d for forwarding to host %s port %d",
4061: newport > 0 ? "Updating" : "Removing",
4062: newport,
1.381 djm 4063: pset->permitted_user[idx].host_to_connect,
4064: pset->permitted_user[idx].port_to_connect);
1.367 djm 4065: if (newport <= 0)
1.381 djm 4066: fwd_perm_clear(&pset->permitted_user[idx]);
1.367 djm 4067: else {
1.381 djm 4068: pset->permitted_user[idx].listen_port =
1.315 markus 4069: (datafellows & SSH_BUG_DYNAMIC_RPORT) ? 0 : newport;
4070: }
1.99 markus 4071: }
4072:
1.314 dtucker 4073: /* returns port number, FWD_PERMIT_ANY_PORT or -1 on error */
4074: int
4075: permitopen_port(const char *p)
4076: {
4077: int port;
4078:
4079: if (strcmp(p, "*") == 0)
4080: return FWD_PERMIT_ANY_PORT;
4081: if ((port = a2port(p)) > 0)
4082: return port;
4083: return -1;
4084: }
4085:
1.276 djm 4086: /* Try to start non-blocking connect to next host in cctx list */
1.127 itojun 4087: static int
1.276 djm 4088: connect_next(struct channel_connect *cctx)
1.41 markus 4089: {
1.276 djm 4090: int sock, saved_errno;
1.336 millert 4091: struct sockaddr_un *sunaddr;
1.367 djm 4092: char ntop[NI_MAXHOST];
4093: char strport[MAXIMUM(NI_MAXSERV, sizeof(sunaddr->sun_path))];
1.41 markus 4094:
1.276 djm 4095: for (; cctx->ai; cctx->ai = cctx->ai->ai_next) {
1.336 millert 4096: switch (cctx->ai->ai_family) {
4097: case AF_UNIX:
4098: /* unix:pathname instead of host:port */
4099: sunaddr = (struct sockaddr_un *)cctx->ai->ai_addr;
4100: strlcpy(ntop, "unix", sizeof(ntop));
4101: strlcpy(strport, sunaddr->sun_path, sizeof(strport));
4102: break;
4103: case AF_INET:
4104: case AF_INET6:
4105: if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen,
4106: ntop, sizeof(ntop), strport, sizeof(strport),
4107: NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
4108: error("connect_next: getnameinfo failed");
4109: continue;
4110: }
4111: break;
4112: default:
1.41 markus 4113: continue;
4114: }
1.300 dtucker 4115: if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype,
4116: cctx->ai->ai_protocol)) == -1) {
1.276 djm 4117: if (cctx->ai->ai_next == NULL)
1.186 djm 4118: error("socket: %.100s", strerror(errno));
4119: else
4120: verbose("socket: %.100s", strerror(errno));
1.41 markus 4121: continue;
4122: }
1.205 djm 4123: if (set_nonblock(sock) == -1)
4124: fatal("%s: set_nonblock(%d)", __func__, sock);
1.276 djm 4125: if (connect(sock, cctx->ai->ai_addr,
4126: cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) {
4127: debug("connect_next: host %.100s ([%.100s]:%s): "
4128: "%.100s", cctx->host, ntop, strport,
1.41 markus 4129: strerror(errno));
1.276 djm 4130: saved_errno = errno;
1.41 markus 4131: close(sock);
1.276 djm 4132: errno = saved_errno;
1.89 stevesk 4133: continue; /* fail -- try next */
1.41 markus 4134: }
1.336 millert 4135: if (cctx->ai->ai_family != AF_UNIX)
4136: set_nodelay(sock);
1.276 djm 4137: debug("connect_next: host %.100s ([%.100s]:%s) "
4138: "in progress, fd=%d", cctx->host, ntop, strport, sock);
4139: cctx->ai = cctx->ai->ai_next;
4140: return sock;
4141: }
4142: return -1;
4143: }
1.41 markus 4144:
1.276 djm 4145: static void
4146: channel_connect_ctx_free(struct channel_connect *cctx)
4147: {
1.321 djm 4148: free(cctx->host);
1.336 millert 4149: if (cctx->aitop) {
4150: if (cctx->aitop->ai_family == AF_UNIX)
4151: free(cctx->aitop);
4152: else
4153: freeaddrinfo(cctx->aitop);
4154: }
1.329 tedu 4155: memset(cctx, 0, sizeof(*cctx));
1.276 djm 4156: }
4157:
1.357 dtucker 4158: /*
1.372 markus 4159: * Return connecting socket to remote host:port or local socket path,
1.357 dtucker 4160: * passing back the failure reason if appropriate.
4161: */
1.372 markus 4162: static int
4163: connect_to_helper(struct ssh *ssh, const char *name, int port, int socktype,
4164: char *ctype, char *rname, struct channel_connect *cctx,
4165: int *reason, const char **errmsg)
1.276 djm 4166: {
4167: struct addrinfo hints;
4168: int gaierr;
4169: int sock = -1;
4170: char strport[NI_MAXSERV];
1.336 millert 4171:
4172: if (port == PORT_STREAMLOCAL) {
4173: struct sockaddr_un *sunaddr;
4174: struct addrinfo *ai;
4175:
4176: if (strlen(name) > sizeof(sunaddr->sun_path)) {
4177: error("%.100s: %.100s", name, strerror(ENAMETOOLONG));
1.372 markus 4178: return -1;
1.336 millert 4179: }
4180:
4181: /*
4182: * Fake up a struct addrinfo for AF_UNIX connections.
4183: * channel_connect_ctx_free() must check ai_family
4184: * and use free() not freeaddirinfo() for AF_UNIX.
4185: */
4186: ai = xmalloc(sizeof(*ai) + sizeof(*sunaddr));
4187: memset(ai, 0, sizeof(*ai) + sizeof(*sunaddr));
4188: ai->ai_addr = (struct sockaddr *)(ai + 1);
4189: ai->ai_addrlen = sizeof(*sunaddr);
4190: ai->ai_family = AF_UNIX;
1.372 markus 4191: ai->ai_socktype = socktype;
1.336 millert 4192: ai->ai_protocol = PF_UNSPEC;
4193: sunaddr = (struct sockaddr_un *)ai->ai_addr;
4194: sunaddr->sun_family = AF_UNIX;
4195: strlcpy(sunaddr->sun_path, name, sizeof(sunaddr->sun_path));
1.372 markus 4196: cctx->aitop = ai;
1.336 millert 4197: } else {
4198: memset(&hints, 0, sizeof(hints));
1.367 djm 4199: hints.ai_family = ssh->chanctxt->IPv4or6;
1.372 markus 4200: hints.ai_socktype = socktype;
1.336 millert 4201: snprintf(strport, sizeof strport, "%d", port);
1.372 markus 4202: if ((gaierr = getaddrinfo(name, strport, &hints, &cctx->aitop))
1.357 dtucker 4203: != 0) {
4204: if (errmsg != NULL)
4205: *errmsg = ssh_gai_strerror(gaierr);
4206: if (reason != NULL)
4207: *reason = SSH2_OPEN_CONNECT_FAILED;
1.336 millert 4208: error("connect_to %.100s: unknown host (%s)", name,
4209: ssh_gai_strerror(gaierr));
1.372 markus 4210: return -1;
1.336 millert 4211: }
1.41 markus 4212: }
1.276 djm 4213:
1.372 markus 4214: cctx->host = xstrdup(name);
4215: cctx->port = port;
4216: cctx->ai = cctx->aitop;
1.276 djm 4217:
1.372 markus 4218: if ((sock = connect_next(cctx)) == -1) {
1.276 djm 4219: error("connect to %.100s port %d failed: %s",
1.336 millert 4220: name, port, strerror(errno));
1.372 markus 4221: return -1;
4222: }
4223:
4224: return sock;
4225: }
4226:
4227: /* Return CONNECTING channel to remote host:port or local socket path */
4228: static Channel *
4229: connect_to(struct ssh *ssh, const char *host, int port,
4230: char *ctype, char *rname)
4231: {
4232: struct channel_connect cctx;
4233: Channel *c;
4234: int sock;
4235:
4236: memset(&cctx, 0, sizeof(cctx));
4237: sock = connect_to_helper(ssh, host, port, SOCK_STREAM, ctype, rname,
4238: &cctx, NULL, NULL);
4239: if (sock == -1) {
1.276 djm 4240: channel_connect_ctx_free(&cctx);
4241: return NULL;
1.41 markus 4242: }
1.367 djm 4243: c = channel_new(ssh, ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1,
1.276 djm 4244: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1);
1.372 markus 4245: c->host_port = port;
4246: c->path = xstrdup(host);
1.276 djm 4247: c->connect_ctx = cctx;
1.372 markus 4248:
1.276 djm 4249: return c;
1.41 markus 4250: }
1.99 markus 4251:
1.354 markus 4252: /*
4253: * returns either the newly connected channel or the downstream channel
4254: * that needs to deal with this connection.
4255: */
1.276 djm 4256: Channel *
1.367 djm 4257: channel_connect_by_listen_address(struct ssh *ssh, const char *listen_host,
1.333 markus 4258: u_short listen_port, char *ctype, char *rname)
1.73 markus 4259: {
1.367 djm 4260: struct ssh_channels *sc = ssh->chanctxt;
1.381 djm 4261: struct permission_set *pset = &sc->local_perms;
1.367 djm 4262: u_int i;
1.381 djm 4263: struct permission *perm;
1.99 markus 4264:
1.381 djm 4265: for (i = 0; i < pset->num_permitted_user; i++) {
4266: perm = &pset->permitted_user[i];
4267: if (open_listen_match_tcpip(perm,
4268: listen_host, listen_port, 1)) {
4269: if (perm->downstream)
4270: return perm->downstream;
4271: if (perm->port_to_connect == 0)
1.372 markus 4272: return rdynamic_connect_prepare(ssh,
4273: ctype, rname);
1.367 djm 4274: return connect_to(ssh,
1.381 djm 4275: perm->host_to_connect, perm->port_to_connect,
1.367 djm 4276: ctype, rname);
1.276 djm 4277: }
4278: }
1.74 markus 4279: error("WARNING: Server requests forwarding for unknown listen_port %d",
4280: listen_port);
1.276 djm 4281: return NULL;
1.73 markus 4282: }
4283:
1.336 millert 4284: Channel *
1.367 djm 4285: channel_connect_by_listen_path(struct ssh *ssh, const char *path,
4286: char *ctype, char *rname)
1.336 millert 4287: {
1.367 djm 4288: struct ssh_channels *sc = ssh->chanctxt;
1.381 djm 4289: struct permission_set *pset = &sc->local_perms;
1.367 djm 4290: u_int i;
1.381 djm 4291: struct permission *perm;
1.336 millert 4292:
1.381 djm 4293: for (i = 0; i < pset->num_permitted_user; i++) {
4294: perm = &pset->permitted_user[i];
4295: if (open_listen_match_streamlocal(perm, path)) {
1.367 djm 4296: return connect_to(ssh,
1.381 djm 4297: perm->host_to_connect, perm->port_to_connect,
1.367 djm 4298: ctype, rname);
1.336 millert 4299: }
4300: }
4301: error("WARNING: Server requests forwarding for unknown path %.100s",
4302: path);
4303: return NULL;
4304: }
4305:
1.99 markus 4306: /* Check if connecting to that port is permitted and connect. */
1.276 djm 4307: Channel *
1.367 djm 4308: channel_connect_to_port(struct ssh *ssh, const char *host, u_short port,
4309: char *ctype, char *rname, int *reason, const char **errmsg)
1.99 markus 4310: {
1.367 djm 4311: struct ssh_channels *sc = ssh->chanctxt;
1.381 djm 4312: struct permission_set *pset = &sc->local_perms;
1.372 markus 4313: struct channel_connect cctx;
4314: Channel *c;
1.367 djm 4315: u_int i, permit, permit_adm = 1;
1.372 markus 4316: int sock;
1.381 djm 4317: struct permission *perm;
1.99 markus 4318:
1.381 djm 4319: permit = pset->all_permitted;
1.99 markus 4320: if (!permit) {
1.381 djm 4321: for (i = 0; i < pset->num_permitted_user; i++) {
4322: perm = &pset->permitted_user[i];
4323: if (open_match(perm, host, port)) {
1.99 markus 4324: permit = 1;
1.333 markus 4325: break;
4326: }
1.367 djm 4327: }
1.257 dtucker 4328: }
1.99 markus 4329:
1.381 djm 4330: if (pset->num_permitted_admin > 0) {
1.257 dtucker 4331: permit_adm = 0;
1.381 djm 4332: for (i = 0; i < pset->num_permitted_admin; i++) {
4333: perm = &pset->permitted_admin[i];
4334: if (open_match(perm, host, port)) {
1.257 dtucker 4335: permit_adm = 1;
1.333 markus 4336: break;
4337: }
1.367 djm 4338: }
1.99 markus 4339: }
1.257 dtucker 4340:
4341: if (!permit || !permit_adm) {
1.188 itojun 4342: logit("Received request to connect to host %.100s port %d, "
1.99 markus 4343: "but the request was denied.", host, port);
1.357 dtucker 4344: if (reason != NULL)
4345: *reason = SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED;
1.276 djm 4346: return NULL;
1.99 markus 4347: }
1.372 markus 4348:
4349: memset(&cctx, 0, sizeof(cctx));
4350: sock = connect_to_helper(ssh, host, port, SOCK_STREAM, ctype, rname,
4351: &cctx, reason, errmsg);
4352: if (sock == -1) {
4353: channel_connect_ctx_free(&cctx);
4354: return NULL;
4355: }
4356:
4357: c = channel_new(ssh, ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1,
4358: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1);
4359: c->host_port = port;
4360: c->path = xstrdup(host);
4361: c->connect_ctx = cctx;
4362:
4363: return c;
1.336 millert 4364: }
4365:
4366: /* Check if connecting to that path is permitted and connect. */
4367: Channel *
1.367 djm 4368: channel_connect_to_path(struct ssh *ssh, const char *path,
4369: char *ctype, char *rname)
1.336 millert 4370: {
1.367 djm 4371: struct ssh_channels *sc = ssh->chanctxt;
1.381 djm 4372: struct permission_set *pset = &sc->local_perms;
1.367 djm 4373: u_int i, permit, permit_adm = 1;
1.381 djm 4374: struct permission *perm;
1.336 millert 4375:
1.381 djm 4376: permit = pset->all_permitted;
1.336 millert 4377: if (!permit) {
1.381 djm 4378: for (i = 0; i < pset->num_permitted_user; i++) {
4379: perm = &pset->permitted_user[i];
4380: if (open_match(perm, path, PORT_STREAMLOCAL)) {
1.336 millert 4381: permit = 1;
4382: break;
4383: }
1.367 djm 4384: }
1.336 millert 4385: }
4386:
1.381 djm 4387: if (pset->num_permitted_admin > 0) {
1.336 millert 4388: permit_adm = 0;
1.381 djm 4389: for (i = 0; i < pset->num_permitted_admin; i++) {
4390: perm = &pset->permitted_admin[i];
4391: if (open_match(perm, path, PORT_STREAMLOCAL)) {
1.336 millert 4392: permit_adm = 1;
4393: break;
4394: }
1.367 djm 4395: }
1.336 millert 4396: }
4397:
4398: if (!permit || !permit_adm) {
4399: logit("Received request to connect to path %.100s, "
4400: "but the request was denied.", path);
4401: return NULL;
4402: }
1.367 djm 4403: return connect_to(ssh, path, PORT_STREAMLOCAL, ctype, rname);
1.204 djm 4404: }
4405:
4406: void
1.367 djm 4407: channel_send_window_changes(struct ssh *ssh)
1.204 djm 4408: {
1.367 djm 4409: struct ssh_channels *sc = ssh->chanctxt;
4410: struct winsize ws;
4411: int r;
1.209 avsm 4412: u_int i;
1.204 djm 4413:
1.367 djm 4414: for (i = 0; i < sc->channels_alloc; i++) {
4415: if (sc->channels[i] == NULL || !sc->channels[i]->client_tty ||
4416: sc->channels[i]->type != SSH_CHANNEL_OPEN)
1.204 djm 4417: continue;
1.367 djm 4418: if (ioctl(sc->channels[i]->rfd, TIOCGWINSZ, &ws) < 0)
1.204 djm 4419: continue;
1.367 djm 4420: channel_request_start(ssh, i, "window-change", 0);
4421: if ((r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 ||
4422: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 ||
4423: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 ||
4424: (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0 ||
4425: (r = sshpkt_send(ssh)) != 0)
4426: fatal("%s: channel %u: send window-change: %s",
4427: __func__, i, ssh_err(r));
1.204 djm 4428: }
1.372 markus 4429: }
4430:
4431: /* Return RDYNAMIC_OPEN channel: channel allows SOCKS, but is not connected */
4432: static Channel *
4433: rdynamic_connect_prepare(struct ssh *ssh, char *ctype, char *rname)
4434: {
4435: Channel *c;
4436: int r;
4437:
4438: c = channel_new(ssh, ctype, SSH_CHANNEL_RDYNAMIC_OPEN, -1, -1, -1,
4439: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1);
4440: c->host_port = 0;
4441: c->path = NULL;
4442:
4443: /*
4444: * We need to open the channel before we have a FD,
4445: * so that we can get SOCKS header from peer.
4446: */
4447: if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION)) != 0 ||
4448: (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 ||
4449: (r = sshpkt_put_u32(ssh, c->self)) != 0 ||
4450: (r = sshpkt_put_u32(ssh, c->local_window)) != 0 ||
4451: (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0) {
4452: fatal("%s: channel %i: confirm: %s", __func__,
4453: c->self, ssh_err(r));
4454: }
4455: return c;
4456: }
4457:
4458: /* Return CONNECTING socket to remote host:port or local socket path */
4459: static int
4460: rdynamic_connect_finish(struct ssh *ssh, Channel *c)
4461: {
4462: struct channel_connect cctx;
4463: int sock;
4464:
4465: memset(&cctx, 0, sizeof(cctx));
4466: sock = connect_to_helper(ssh, c->path, c->host_port, SOCK_STREAM, NULL,
4467: NULL, &cctx, NULL, NULL);
4468: if (sock == -1)
4469: channel_connect_ctx_free(&cctx);
4470: else {
4471: /* similar to SSH_CHANNEL_CONNECTING but we've already sent the open */
4472: c->type = SSH_CHANNEL_RDYNAMIC_FINISH;
4473: c->connect_ctx = cctx;
4474: channel_register_fds(ssh, c, sock, sock, -1, 0, 1, 0);
4475: }
4476: return sock;
1.99 markus 4477: }
4478:
1.121 markus 4479: /* -- X11 forwarding */
1.1 deraadt 4480:
1.27 markus 4481: /*
4482: * Creates an internet domain socket for listening for X11 connections.
1.176 deraadt 4483: * Returns 0 and a suitable display number for the DISPLAY variable
4484: * stored in display_numberp , or -1 if an error occurs.
1.27 markus 4485: */
1.141 stevesk 4486: int
1.367 djm 4487: x11_create_display_inet(struct ssh *ssh, int x11_display_offset,
4488: int x11_use_localhost, int single_connection,
4489: u_int *display_numberp, int **chanids)
1.1 deraadt 4490: {
1.149 markus 4491: Channel *nc = NULL;
1.31 markus 4492: int display_number, sock;
4493: u_short port;
1.35 markus 4494: struct addrinfo hints, *ai, *aitop;
4495: char strport[NI_MAXSERV];
4496: int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
1.25 markus 4497:
1.224 markus 4498: if (chanids == NULL)
4499: return -1;
4500:
1.33 markus 4501: for (display_number = x11_display_offset;
1.148 deraadt 4502: display_number < MAX_DISPLAYS;
4503: display_number++) {
1.25 markus 4504: port = 6000 + display_number;
1.35 markus 4505: memset(&hints, 0, sizeof(hints));
1.367 djm 4506: hints.ai_family = ssh->chanctxt->IPv4or6;
1.163 stevesk 4507: hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
1.35 markus 4508: hints.ai_socktype = SOCK_STREAM;
4509: snprintf(strport, sizeof strport, "%d", port);
1.367 djm 4510: if ((gaierr = getaddrinfo(NULL, strport,
4511: &hints, &aitop)) != 0) {
1.271 dtucker 4512: error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr));
1.141 stevesk 4513: return -1;
1.25 markus 4514: }
1.35 markus 4515: for (ai = aitop; ai; ai = ai->ai_next) {
1.367 djm 4516: if (ai->ai_family != AF_INET &&
4517: ai->ai_family != AF_INET6)
1.35 markus 4518: continue;
1.300 dtucker 4519: sock = socket(ai->ai_family, ai->ai_socktype,
4520: ai->ai_protocol);
1.35 markus 4521: if (sock < 0) {
4522: error("socket: %.100s", strerror(errno));
1.203 markus 4523: freeaddrinfo(aitop);
1.141 stevesk 4524: return -1;
1.35 markus 4525: }
1.376 djm 4526: set_reuseaddr(sock);
1.35 markus 4527: if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1.367 djm 4528: debug2("%s: bind port %d: %.100s", __func__,
4529: port, strerror(errno));
1.35 markus 4530: close(sock);
1.367 djm 4531: for (n = 0; n < num_socks; n++)
1.35 markus 4532: close(socks[n]);
4533: num_socks = 0;
4534: break;
4535: }
4536: socks[num_socks++] = sock;
4537: if (num_socks == NUM_SOCKS)
4538: break;
1.25 markus 4539: }
1.83 stevesk 4540: freeaddrinfo(aitop);
1.35 markus 4541: if (num_socks > 0)
4542: break;
1.25 markus 4543: }
4544: if (display_number >= MAX_DISPLAYS) {
4545: error("Failed to allocate internet-domain X11 display socket.");
1.141 stevesk 4546: return -1;
1.25 markus 4547: }
4548: /* Start listening for connections on the socket. */
1.35 markus 4549: for (n = 0; n < num_socks; n++) {
4550: sock = socks[n];
1.199 markus 4551: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.35 markus 4552: error("listen: %.100s", strerror(errno));
4553: close(sock);
1.141 stevesk 4554: return -1;
1.35 markus 4555: }
1.25 markus 4556: }
1.35 markus 4557:
4558: /* Allocate a channel for each socket. */
1.242 djm 4559: *chanids = xcalloc(num_socks + 1, sizeof(**chanids));
1.35 markus 4560: for (n = 0; n < num_socks; n++) {
4561: sock = socks[n];
1.367 djm 4562: nc = channel_new(ssh, "x11 listener",
1.51 markus 4563: SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
4564: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.190 markus 4565: 0, "X11 inet listener", 1);
1.167 markus 4566: nc->single_connection = single_connection;
1.224 markus 4567: (*chanids)[n] = nc->self;
1.35 markus 4568: }
1.224 markus 4569: (*chanids)[n] = -1;
1.1 deraadt 4570:
1.141 stevesk 4571: /* Return the display number for the DISPLAY environment variable. */
1.176 deraadt 4572: *display_numberp = display_number;
1.367 djm 4573: return 0;
1.1 deraadt 4574: }
4575:
1.127 itojun 4576: static int
1.77 markus 4577: connect_local_xsocket(u_int dnr)
1.1 deraadt 4578: {
1.25 markus 4579: int sock;
4580: struct sockaddr_un addr;
4581:
1.147 stevesk 4582: sock = socket(AF_UNIX, SOCK_STREAM, 0);
4583: if (sock < 0)
4584: error("socket: %.100s", strerror(errno));
4585: memset(&addr, 0, sizeof(addr));
4586: addr.sun_family = AF_UNIX;
4587: snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
1.239 deraadt 4588: if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0)
1.147 stevesk 4589: return sock;
4590: close(sock);
1.25 markus 4591: error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
4592: return -1;
1.1 deraadt 4593: }
4594:
1.51 markus 4595: int
1.367 djm 4596: x11_connect_display(struct ssh *ssh)
1.1 deraadt 4597: {
1.248 deraadt 4598: u_int display_number;
1.25 markus 4599: const char *display;
1.51 markus 4600: char buf[1024], *cp;
1.35 markus 4601: struct addrinfo hints, *ai, *aitop;
4602: char strport[NI_MAXSERV];
1.248 deraadt 4603: int gaierr, sock = 0;
1.25 markus 4604:
4605: /* Try to open a socket for the local X server. */
4606: display = getenv("DISPLAY");
4607: if (!display) {
4608: error("DISPLAY not set.");
1.51 markus 4609: return -1;
1.25 markus 4610: }
1.27 markus 4611: /*
4612: * Now we decode the value of the DISPLAY variable and make a
4613: * connection to the real X server.
4614: */
4615:
4616: /*
4617: * Check if it is a unix domain socket. Unix domain displays are in
4618: * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
4619: */
1.25 markus 4620: if (strncmp(display, "unix:", 5) == 0 ||
4621: display[0] == ':') {
4622: /* Connect to the unix domain socket. */
1.367 djm 4623: if (sscanf(strrchr(display, ':') + 1, "%u",
4624: &display_number) != 1) {
4625: error("Could not parse display number from DISPLAY: "
4626: "%.100s", display);
1.51 markus 4627: return -1;
1.25 markus 4628: }
4629: /* Create a socket. */
4630: sock = connect_local_xsocket(display_number);
4631: if (sock < 0)
1.51 markus 4632: return -1;
1.25 markus 4633:
4634: /* OK, we now have a connection to the display. */
1.51 markus 4635: return sock;
1.25 markus 4636: }
1.27 markus 4637: /*
4638: * Connect to an inet socket. The DISPLAY value is supposedly
4639: * hostname:d[.s], where hostname may also be numeric IP address.
4640: */
1.145 stevesk 4641: strlcpy(buf, display, sizeof(buf));
1.25 markus 4642: cp = strchr(buf, ':');
4643: if (!cp) {
4644: error("Could not find ':' in DISPLAY: %.100s", display);
1.51 markus 4645: return -1;
1.25 markus 4646: }
4647: *cp = 0;
1.367 djm 4648: /*
4649: * buf now contains the host name. But first we parse the
4650: * display number.
4651: */
1.248 deraadt 4652: if (sscanf(cp + 1, "%u", &display_number) != 1) {
1.25 markus 4653: error("Could not parse display number from DISPLAY: %.100s",
1.148 deraadt 4654: display);
1.51 markus 4655: return -1;
1.25 markus 4656: }
1.35 markus 4657:
4658: /* Look up the host address */
4659: memset(&hints, 0, sizeof(hints));
1.367 djm 4660: hints.ai_family = ssh->chanctxt->IPv4or6;
1.35 markus 4661: hints.ai_socktype = SOCK_STREAM;
1.248 deraadt 4662: snprintf(strport, sizeof strport, "%u", 6000 + display_number);
1.35 markus 4663: if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
1.271 dtucker 4664: error("%.100s: unknown host. (%s)", buf,
4665: ssh_gai_strerror(gaierr));
1.51 markus 4666: return -1;
1.25 markus 4667: }
1.35 markus 4668: for (ai = aitop; ai; ai = ai->ai_next) {
4669: /* Create a socket. */
1.300 dtucker 4670: sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1.35 markus 4671: if (sock < 0) {
1.194 markus 4672: debug2("socket: %.100s", strerror(errno));
1.41 markus 4673: continue;
4674: }
4675: /* Connect it to the display. */
4676: if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1.248 deraadt 4677: debug2("connect %.100s port %u: %.100s", buf,
1.41 markus 4678: 6000 + display_number, strerror(errno));
4679: close(sock);
4680: continue;
4681: }
4682: /* Success */
4683: break;
1.35 markus 4684: }
4685: freeaddrinfo(aitop);
4686: if (!ai) {
1.367 djm 4687: error("connect %.100s port %u: %.100s", buf,
4688: 6000 + display_number, strerror(errno));
1.51 markus 4689: return -1;
1.25 markus 4690: }
1.162 stevesk 4691: set_nodelay(sock);
1.51 markus 4692: return sock;
4693: }
4694:
4695: /*
1.27 markus 4696: * Requests forwarding of X11 connections, generates fake authentication
4697: * data, and enables authentication spoofing.
1.121 markus 4698: * This should be called in the client only.
1.27 markus 4699: */
1.49 markus 4700: void
1.367 djm 4701: x11_request_forwarding_with_spoofing(struct ssh *ssh, int client_session_id,
4702: const char *disp, const char *proto, const char *data, int want_reply)
1.1 deraadt 4703: {
1.367 djm 4704: struct ssh_channels *sc = ssh->chanctxt;
1.77 markus 4705: u_int data_len = (u_int) strlen(data) / 2;
1.219 djm 4706: u_int i, value;
1.367 djm 4707: const char *cp;
1.25 markus 4708: char *new_data;
1.367 djm 4709: int r, screen_number;
1.25 markus 4710:
1.367 djm 4711: if (sc->x11_saved_display == NULL)
4712: sc->x11_saved_display = xstrdup(disp);
4713: else if (strcmp(disp, sc->x11_saved_display) != 0) {
1.219 djm 4714: error("x11_request_forwarding_with_spoofing: different "
4715: "$DISPLAY already forwarded");
4716: return;
4717: }
4718:
1.266 djm 4719: cp = strchr(disp, ':');
1.25 markus 4720: if (cp)
4721: cp = strchr(cp, '.');
4722: if (cp)
1.245 deraadt 4723: screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL);
1.25 markus 4724: else
4725: screen_number = 0;
4726:
1.367 djm 4727: if (sc->x11_saved_proto == NULL) {
1.219 djm 4728: /* Save protocol name. */
1.367 djm 4729: sc->x11_saved_proto = xstrdup(proto);
1.353 natano 4730:
4731: /* Extract real authentication data. */
1.367 djm 4732: sc->x11_saved_data = xmalloc(data_len);
1.219 djm 4733: for (i = 0; i < data_len; i++) {
4734: if (sscanf(data + 2 * i, "%2x", &value) != 1)
4735: fatal("x11_request_forwarding: bad "
4736: "authentication data: %.100s", data);
1.367 djm 4737: sc->x11_saved_data[i] = value;
1.219 djm 4738: }
1.367 djm 4739: sc->x11_saved_data_len = data_len;
1.353 natano 4740:
4741: /* Generate fake data of the same length. */
1.367 djm 4742: sc->x11_fake_data = xmalloc(data_len);
4743: arc4random_buf(sc->x11_fake_data, data_len);
4744: sc->x11_fake_data_len = data_len;
1.25 markus 4745: }
4746:
4747: /* Convert the fake data into hex. */
1.367 djm 4748: new_data = tohex(sc->x11_fake_data, data_len);
1.25 markus 4749:
4750: /* Send the request packet. */
1.367 djm 4751: channel_request_start(ssh, client_session_id, "x11-req", want_reply);
4752: if ((r = sshpkt_put_u8(ssh, 0)) != 0 || /* bool: single connection */
4753: (r = sshpkt_put_cstring(ssh, proto)) != 0 ||
4754: (r = sshpkt_put_cstring(ssh, new_data)) != 0 ||
4755: (r = sshpkt_put_u32(ssh, screen_number)) != 0 ||
4756: (r = sshpkt_send(ssh)) != 0 ||
4757: (r = ssh_packet_write_wait(ssh)) != 0)
4758: fatal("%s: send x11-req: %s", __func__, ssh_err(r));
1.321 djm 4759: free(new_data);
1.1 deraadt 4760: }
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