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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
4 | * All rights reserved | |
5260325f | 5 | * This file contains functions for generic socket connection forwarding. |
6 | * There is also code for initiating connection forwarding for X11 connections, | |
7 | * arbitrary tcp/ip connections, and the authentication agent connection. | |
6ae2364d | 8 | * |
bcbf86ec | 9 | * As far as I am concerned, the code I have written for this software |
10 | * can be used freely for any purpose. Any derived versions of this | |
11 | * software must be clearly marked as such, and if the derived work is | |
12 | * incompatible with the protocol description in the RFC file, it must be | |
13 | * called by a name other than "ssh" or "Secure Shell". | |
14 | * | |
15 | * | |
7e7327a1 | 16 | * SSH2 support added by Markus Friedl. |
bcbf86ec | 17 | * Copyright (c) 1999,2000 Markus Friedl. All rights reserved. |
18 | * Copyright (c) 1999 Dug Song. All rights reserved. | |
19 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
7e8c18e9 | 43 | RCSID("$OpenBSD: channels.c,v 1.117 2001/05/19 19:57:09 stevesk Exp $"); |
42f11eb2 | 44 | |
45 | #include <openssl/rsa.h> | |
46 | #include <openssl/dsa.h> | |
8efc0c15 | 47 | |
48 | #include "ssh.h" | |
42f11eb2 | 49 | #include "ssh1.h" |
50 | #include "ssh2.h" | |
8efc0c15 | 51 | #include "packet.h" |
52 | #include "xmalloc.h" | |
53 | #include "buffer.h" | |
0490e609 | 54 | #include "bufaux.h" |
8efc0c15 | 55 | #include "uidswap.h" |
42f11eb2 | 56 | #include "log.h" |
57 | #include "misc.h" | |
8efc0c15 | 58 | #include "channels.h" |
59 | #include "nchan.h" | |
60 | #include "compat.h" | |
42f11eb2 | 61 | #include "canohost.h" |
4c8722d9 | 62 | #include "key.h" |
63 | #include "authfd.h" | |
7e7327a1 | 64 | |
8efc0c15 | 65 | /* Maximum number of fake X11 displays to try. */ |
66 | #define MAX_DISPLAYS 1000 | |
67 | ||
68 | /* Max len of agent socket */ | |
69 | #define MAX_SOCKET_NAME 100 | |
70 | ||
aa3378df | 71 | /* |
72 | * Pointer to an array containing all allocated channels. The array is | |
73 | * dynamically extended as needed. | |
74 | */ | |
719fc62f | 75 | static Channel **channels = NULL; |
8efc0c15 | 76 | |
aa3378df | 77 | /* |
78 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 79 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 80 | */ |
8efc0c15 | 81 | static int channels_alloc = 0; |
82 | ||
aa3378df | 83 | /* |
84 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 85 | * updated in channel_new. |
aa3378df | 86 | */ |
39929cdb | 87 | static int channel_max_fd = 0; |
8efc0c15 | 88 | |
89 | /* Name and directory of socket for authentication agent forwarding. */ | |
90 | static char *channel_forwarded_auth_socket_name = NULL; | |
5260325f | 91 | static char *channel_forwarded_auth_socket_dir = NULL; |
8efc0c15 | 92 | |
93 | /* Saved X11 authentication protocol name. */ | |
94 | char *x11_saved_proto = NULL; | |
95 | ||
96 | /* Saved X11 authentication data. This is the real data. */ | |
97 | char *x11_saved_data = NULL; | |
1e3b8b07 | 98 | u_int x11_saved_data_len = 0; |
8efc0c15 | 99 | |
aa3378df | 100 | /* |
101 | * Fake X11 authentication data. This is what the server will be sending us; | |
102 | * we should replace any occurrences of this by the real data. | |
103 | */ | |
8efc0c15 | 104 | char *x11_fake_data = NULL; |
1e3b8b07 | 105 | u_int x11_fake_data_len; |
8efc0c15 | 106 | |
aa3378df | 107 | /* |
108 | * Data structure for storing which hosts are permitted for forward requests. | |
109 | * The local sides of any remote forwards are stored in this array to prevent | |
110 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
111 | * network (which might be behind a firewall). | |
112 | */ | |
5260325f | 113 | typedef struct { |
7368a6c8 | 114 | char *host_to_connect; /* Connect to 'host'. */ |
115 | u_short port_to_connect; /* Connect to 'port'. */ | |
116 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 117 | } ForwardPermission; |
118 | ||
119 | /* List of all permitted host/port pairs to connect. */ | |
120 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
121 | /* Number of permitted host/port pairs in the array. */ | |
122 | static int num_permitted_opens = 0; | |
aa3378df | 123 | /* |
124 | * If this is true, all opens are permitted. This is the case on the server | |
125 | * on which we have to trust the client anyway, and the user could do | |
126 | * anything after logging in anyway. | |
127 | */ | |
8efc0c15 | 128 | static int all_opens_permitted = 0; |
129 | ||
130 | /* This is set to true if both sides support SSH_PROTOFLAG_HOST_IN_FWD_OPEN. */ | |
131 | static int have_hostname_in_open = 0; | |
132 | ||
42f11eb2 | 133 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
134 | extern int IPv4or6; | |
135 | ||
0490e609 | 136 | void port_open_helper(Channel *c, char *rtype); |
137 | ||
8efc0c15 | 138 | /* Sets specific protocol options. */ |
139 | ||
6ae2364d | 140 | void |
5260325f | 141 | channel_set_options(int hostname_in_open) |
8efc0c15 | 142 | { |
5260325f | 143 | have_hostname_in_open = hostname_in_open; |
8efc0c15 | 144 | } |
145 | ||
7368a6c8 | 146 | /* lookup channel by id */ |
147 | ||
148 | Channel * | |
149 | channel_lookup(int id) | |
150 | { | |
151 | Channel *c; | |
719fc62f | 152 | |
3e98362e | 153 | if (id < 0 || id > channels_alloc) { |
7368a6c8 | 154 | log("channel_lookup: %d: bad id", id); |
155 | return NULL; | |
156 | } | |
719fc62f | 157 | c = channels[id]; |
158 | if (c == NULL) { | |
7368a6c8 | 159 | log("channel_lookup: %d: bad id: channel free", id); |
160 | return NULL; | |
161 | } | |
162 | return c; | |
163 | } | |
164 | ||
aa3378df | 165 | /* |
1d1ffb87 | 166 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 167 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 168 | */ |
8efc0c15 | 169 | |
0fbe8c74 | 170 | void |
a22aff1f | 171 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
172 | int extusage, int nonblock) | |
8efc0c15 | 173 | { |
5260325f | 174 | /* Update the maximum file descriptor value. */ |
39929cdb | 175 | channel_max_fd = MAX(channel_max_fd, rfd); |
176 | channel_max_fd = MAX(channel_max_fd, wfd); | |
177 | channel_max_fd = MAX(channel_max_fd, efd); | |
178 | ||
aa3378df | 179 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 180 | |
0fbe8c74 | 181 | c->rfd = rfd; |
182 | c->wfd = wfd; | |
183 | c->sock = (rfd == wfd) ? rfd : -1; | |
184 | c->efd = efd; | |
185 | c->extended_usage = extusage; | |
a22aff1f | 186 | |
0ae4fe1d | 187 | /* XXX ugly hack: nonblock is only set by the server */ |
188 | if (nonblock && isatty(c->rfd)) { | |
94dfb550 | 189 | debug("channel %d: rfd %d isatty", c->self, c->rfd); |
0ae4fe1d | 190 | c->isatty = 1; |
191 | if (!isatty(c->wfd)) { | |
94dfb550 | 192 | error("channel %d: wfd %d is not a tty?", |
0ae4fe1d | 193 | c->self, c->wfd); |
194 | } | |
195 | } else { | |
196 | c->isatty = 0; | |
197 | } | |
198 | ||
a22aff1f | 199 | /* enable nonblocking mode */ |
200 | if (nonblock) { | |
201 | if (rfd != -1) | |
202 | set_nonblock(rfd); | |
203 | if (wfd != -1) | |
204 | set_nonblock(wfd); | |
205 | if (efd != -1) | |
206 | set_nonblock(efd); | |
207 | } | |
0fbe8c74 | 208 | } |
209 | ||
210 | /* | |
211 | * Allocate a new channel object and set its type and socket. This will cause | |
212 | * remote_name to be freed. | |
213 | */ | |
214 | ||
719fc62f | 215 | Channel * |
0fbe8c74 | 216 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
a22aff1f | 217 | int window, int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 218 | { |
219 | int i, found; | |
220 | Channel *c; | |
5260325f | 221 | |
222 | /* Do initial allocation if this is the first call. */ | |
223 | if (channels_alloc == 0) { | |
7e7327a1 | 224 | chan_init(); |
5260325f | 225 | channels_alloc = 10; |
719fc62f | 226 | channels = xmalloc(channels_alloc * sizeof(Channel *)); |
5260325f | 227 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 228 | channels[i] = NULL; |
aa3378df | 229 | /* |
230 | * Kludge: arrange a call to channel_stop_listening if we | |
231 | * terminate with fatal(). | |
232 | */ | |
5260325f | 233 | fatal_add_cleanup((void (*) (void *)) channel_stop_listening, NULL); |
234 | } | |
235 | /* Try to find a free slot where to put the new channel. */ | |
236 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 237 | if (channels[i] == NULL) { |
5260325f | 238 | /* Found a free slot. */ |
239 | found = i; | |
240 | break; | |
241 | } | |
242 | if (found == -1) { | |
aa3378df | 243 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 244 | found = channels_alloc; |
245 | channels_alloc += 10; | |
de273eef | 246 | debug2("channel: expanding %d", channels_alloc); |
719fc62f | 247 | channels = xrealloc(channels, channels_alloc * sizeof(Channel *)); |
5260325f | 248 | for (i = found; i < channels_alloc; i++) |
719fc62f | 249 | channels[i] = NULL; |
5260325f | 250 | } |
719fc62f | 251 | /* Initialize and return new channel. */ |
252 | c = channels[found] = xmalloc(sizeof(Channel)); | |
5260325f | 253 | buffer_init(&c->input); |
254 | buffer_init(&c->output); | |
7368a6c8 | 255 | buffer_init(&c->extended); |
5260325f | 256 | chan_init_iostates(c); |
a22aff1f | 257 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 258 | c->self = found; |
259 | c->type = type; | |
7368a6c8 | 260 | c->ctype = ctype; |
0b242b12 | 261 | c->local_window = window; |
262 | c->local_window_max = window; | |
263 | c->local_consumed = 0; | |
264 | c->local_maxpacket = maxpack; | |
5260325f | 265 | c->remote_id = -1; |
266 | c->remote_name = remote_name; | |
7368a6c8 | 267 | c->remote_window = 0; |
268 | c->remote_maxpacket = 0; | |
269 | c->cb_fn = NULL; | |
270 | c->cb_arg = NULL; | |
271 | c->cb_event = 0; | |
272 | c->dettach_user = NULL; | |
2e73a022 | 273 | c->input_filter = NULL; |
5260325f | 274 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 275 | return c; |
7368a6c8 | 276 | } |
8efc0c15 | 277 | |
0fbe8c74 | 278 | /* Close all channel fd/socket. */ |
279 | ||
280 | void | |
281 | channel_close_fds(Channel *c) | |
282 | { | |
283 | if (c->sock != -1) { | |
284 | close(c->sock); | |
285 | c->sock = -1; | |
286 | } | |
287 | if (c->rfd != -1) { | |
288 | close(c->rfd); | |
289 | c->rfd = -1; | |
290 | } | |
291 | if (c->wfd != -1) { | |
292 | close(c->wfd); | |
293 | c->wfd = -1; | |
294 | } | |
295 | if (c->efd != -1) { | |
296 | close(c->efd); | |
297 | c->efd = -1; | |
298 | } | |
299 | } | |
300 | ||
301 | /* Free the channel and close its fd/socket. */ | |
8efc0c15 | 302 | |
6ae2364d | 303 | void |
719fc62f | 304 | channel_free(Channel *c) |
8efc0c15 | 305 | { |
719fc62f | 306 | char *s; |
b148018f | 307 | |
719fc62f | 308 | s = channel_open_message(); |
309 | debug("channel_free: channel %d: status: %s", c->self, s); | |
b148018f | 310 | xfree(s); |
311 | ||
7e7327a1 | 312 | if (c->dettach_user != NULL) { |
719fc62f | 313 | debug("channel_free: channel %d: dettaching channel user", c->self); |
7e7327a1 | 314 | c->dettach_user(c->self, NULL); |
315 | } | |
0fbe8c74 | 316 | if (c->sock != -1) |
7368a6c8 | 317 | shutdown(c->sock, SHUT_RDWR); |
0fbe8c74 | 318 | channel_close_fds(c); |
7368a6c8 | 319 | buffer_free(&c->input); |
320 | buffer_free(&c->output); | |
321 | buffer_free(&c->extended); | |
7368a6c8 | 322 | if (c->remote_name) { |
323 | xfree(c->remote_name); | |
324 | c->remote_name = NULL; | |
5260325f | 325 | } |
719fc62f | 326 | channels[c->self] = NULL; |
327 | xfree(c); | |
8efc0c15 | 328 | } |
329 | ||
aa3378df | 330 | /* |
7368a6c8 | 331 | * 'channel_pre*' are called just before select() to add any bits relevant to |
332 | * channels in the select bitmasks. | |
aa3378df | 333 | */ |
7368a6c8 | 334 | /* |
335 | * 'channel_post*': perform any appropriate operations for channels which | |
336 | * have events pending. | |
337 | */ | |
338 | typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset); | |
339 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; | |
340 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 341 | |
7368a6c8 | 342 | void |
343 | channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset) | |
8efc0c15 | 344 | { |
7368a6c8 | 345 | FD_SET(c->sock, readset); |
346 | } | |
5260325f | 347 | |
97fb6912 | 348 | void |
349 | channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset) | |
350 | { | |
351 | debug3("channel %d: waiting for connection", c->self); | |
352 | FD_SET(c->sock, writeset); | |
353 | } | |
354 | ||
7368a6c8 | 355 | void |
356 | channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset) | |
357 | { | |
358 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
359 | FD_SET(c->sock, readset); | |
360 | if (buffer_len(&c->output) > 0) | |
361 | FD_SET(c->sock, writeset); | |
362 | } | |
5260325f | 363 | |
7368a6c8 | 364 | void |
365 | channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset) | |
366 | { | |
367 | /* test whether sockets are 'alive' for read/write */ | |
368 | if (c->istate == CHAN_INPUT_OPEN) | |
369 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
370 | FD_SET(c->sock, readset); | |
371 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
372 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
373 | if (buffer_len(&c->output) > 0) { | |
374 | FD_SET(c->sock, writeset); | |
375 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
376 | chan_obuf_empty(c); | |
377 | } | |
378 | } | |
379 | } | |
5260325f | 380 | |
7e7327a1 | 381 | void |
382 | channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset) | |
383 | { | |
384 | if (c->istate == CHAN_INPUT_OPEN && | |
385 | c->remote_window > 0 && | |
386 | buffer_len(&c->input) < c->remote_window) | |
387 | FD_SET(c->rfd, readset); | |
388 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
389 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
390 | if (buffer_len(&c->output) > 0) { | |
391 | FD_SET(c->wfd, writeset); | |
392 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
393 | chan_obuf_empty(c); | |
394 | } | |
395 | } | |
396 | /** XXX check close conditions, too */ | |
397 | if (c->efd != -1) { | |
398 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
399 | buffer_len(&c->extended) > 0) | |
400 | FD_SET(c->efd, writeset); | |
401 | else if (c->extended_usage == CHAN_EXTENDED_READ && | |
402 | buffer_len(&c->extended) < c->remote_window) | |
403 | FD_SET(c->efd, readset); | |
404 | } | |
405 | } | |
406 | ||
7368a6c8 | 407 | void |
408 | channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset) | |
409 | { | |
410 | if (buffer_len(&c->input) == 0) { | |
411 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
412 | packet_put_int(c->remote_id); | |
413 | packet_send(); | |
414 | c->type = SSH_CHANNEL_CLOSED; | |
070adba2 | 415 | debug("channel %d: closing after input drain.", c->self); |
7368a6c8 | 416 | } |
417 | } | |
5260325f | 418 | |
7368a6c8 | 419 | void |
420 | channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset) | |
421 | { | |
422 | if (buffer_len(&c->output) == 0) | |
719fc62f | 423 | chan_mark_dead(c); |
6ae2364d | 424 | else |
7368a6c8 | 425 | FD_SET(c->sock, writeset); |
426 | } | |
5260325f | 427 | |
7368a6c8 | 428 | /* |
429 | * This is a special state for X11 authentication spoofing. An opened X11 | |
430 | * connection (when authentication spoofing is being done) remains in this | |
431 | * state until the first packet has been completely read. The authentication | |
432 | * data in that packet is then substituted by the real data if it matches the | |
433 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 434 | * XXX All this happens at the client side. |
7368a6c8 | 435 | */ |
436 | int | |
437 | x11_open_helper(Channel *c) | |
438 | { | |
1e3b8b07 | 439 | u_char *ucp; |
440 | u_int proto_len, data_len; | |
5260325f | 441 | |
7368a6c8 | 442 | /* Check if the fixed size part of the packet is in buffer. */ |
443 | if (buffer_len(&c->output) < 12) | |
444 | return 0; | |
445 | ||
446 | /* Parse the lengths of variable-length fields. */ | |
1e3b8b07 | 447 | ucp = (u_char *) buffer_ptr(&c->output); |
7368a6c8 | 448 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
449 | proto_len = 256 * ucp[6] + ucp[7]; | |
450 | data_len = 256 * ucp[8] + ucp[9]; | |
451 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
452 | proto_len = ucp[6] + 256 * ucp[7]; | |
453 | data_len = ucp[8] + 256 * ucp[9]; | |
454 | } else { | |
455 | debug("Initial X11 packet contains bad byte order byte: 0x%x", | |
456 | ucp[0]); | |
457 | return -1; | |
458 | } | |
5260325f | 459 | |
7368a6c8 | 460 | /* Check if the whole packet is in buffer. */ |
461 | if (buffer_len(&c->output) < | |
462 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) | |
463 | return 0; | |
5260325f | 464 | |
7368a6c8 | 465 | /* Check if authentication protocol matches. */ |
466 | if (proto_len != strlen(x11_saved_proto) || | |
467 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
468 | debug("X11 connection uses different authentication protocol."); | |
469 | return -1; | |
470 | } | |
471 | /* Check if authentication data matches our fake data. */ | |
472 | if (data_len != x11_fake_data_len || | |
473 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
474 | x11_fake_data, x11_fake_data_len) != 0) { | |
475 | debug("X11 auth data does not match fake data."); | |
476 | return -1; | |
477 | } | |
478 | /* Check fake data length */ | |
479 | if (x11_fake_data_len != x11_saved_data_len) { | |
480 | error("X11 fake_data_len %d != saved_data_len %d", | |
481 | x11_fake_data_len, x11_saved_data_len); | |
482 | return -1; | |
483 | } | |
484 | /* | |
485 | * Received authentication protocol and data match | |
486 | * our fake data. Substitute the fake data with real | |
487 | * data. | |
488 | */ | |
489 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
490 | x11_saved_data, x11_saved_data_len); | |
491 | return 1; | |
492 | } | |
5260325f | 493 | |
7368a6c8 | 494 | void |
495 | channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset) | |
496 | { | |
497 | int ret = x11_open_helper(c); | |
498 | if (ret == 1) { | |
499 | /* Start normal processing for the channel. */ | |
500 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 501 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 502 | } else if (ret == -1) { |
503 | /* | |
504 | * We have received an X11 connection that has bad | |
505 | * authentication information. | |
506 | */ | |
54b974dc | 507 | log("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 508 | buffer_clear(&c->input); |
509 | buffer_clear(&c->output); | |
510 | close(c->sock); | |
511 | c->sock = -1; | |
512 | c->type = SSH_CHANNEL_CLOSED; | |
513 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
514 | packet_put_int(c->remote_id); | |
515 | packet_send(); | |
516 | } | |
517 | } | |
5260325f | 518 | |
7368a6c8 | 519 | void |
0b242b12 | 520 | channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset) |
7368a6c8 | 521 | { |
522 | int ret = x11_open_helper(c); | |
523 | if (ret == 1) { | |
524 | c->type = SSH_CHANNEL_OPEN; | |
d0c832f3 | 525 | if (compat20) |
526 | channel_pre_open_20(c, readset, writeset); | |
527 | else | |
528 | channel_pre_open_15(c, readset, writeset); | |
7368a6c8 | 529 | } else if (ret == -1) { |
530 | debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); | |
0b242b12 | 531 | chan_read_failed(c); /** force close? */ |
7368a6c8 | 532 | chan_write_failed(c); |
533 | debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); | |
534 | } | |
535 | } | |
5260325f | 536 | |
28b9cb4d | 537 | /* try to decode a socks4 header */ |
538 | int | |
539 | channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset) | |
0490e609 | 540 | { |
541 | u_char *p, *host; | |
53b8fe68 | 542 | int len, have, i, found; |
28b9cb4d | 543 | char username[256]; |
0490e609 | 544 | struct { |
545 | u_int8_t version; | |
546 | u_int8_t command; | |
547 | u_int16_t dest_port; | |
28b9cb4d | 548 | struct in_addr dest_addr; |
0490e609 | 549 | } s4_req, s4_rsp; |
550 | ||
28b9cb4d | 551 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 552 | |
553 | have = buffer_len(&c->input); | |
554 | len = sizeof(s4_req); | |
555 | if (have < len) | |
556 | return 0; | |
557 | p = buffer_ptr(&c->input); | |
558 | for (found = 0, i = len; i < have; i++) { | |
559 | if (p[i] == '\0') { | |
560 | found = 1; | |
561 | break; | |
562 | } | |
563 | if (i > 1024) { | |
564 | /* the peer is probably sending garbage */ | |
565 | debug("channel %d: decode socks4: too long", | |
566 | c->self); | |
567 | return -1; | |
568 | } | |
569 | } | |
570 | if (!found) | |
571 | return 0; | |
0490e609 | 572 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
573 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
574 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 575 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 576 | have = buffer_len(&c->input); |
0490e609 | 577 | p = buffer_ptr(&c->input); |
578 | len = strlen(p); | |
6683b40f | 579 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 580 | if (len > have) |
28b9cb4d | 581 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 582 | c->self, len, have); |
583 | strlcpy(username, p, sizeof(username)); | |
584 | buffer_consume(&c->input, len); | |
585 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
586 | ||
28b9cb4d | 587 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 588 | strlcpy(c->path, host, sizeof(c->path)); |
589 | c->host_port = ntohs(s4_req.dest_port); | |
590 | ||
6683b40f | 591 | debug("channel %d: dynamic request: socks4 host %s port %u command %u", |
592 | c->self, host, c->host_port, s4_req.command); | |
0490e609 | 593 | |
28b9cb4d | 594 | if (s4_req.command != 1) { |
595 | debug("channel %d: cannot handle: socks4 cn %d", | |
596 | c->self, s4_req.command); | |
597 | return -1; | |
0490e609 | 598 | } |
28b9cb4d | 599 | s4_rsp.version = 0; /* vn: 0 for reply */ |
600 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 601 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 602 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
0490e609 | 603 | buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 604 | return 1; |
0490e609 | 605 | } |
606 | ||
28b9cb4d | 607 | /* dynamic port forwarding */ |
608 | void | |
609 | channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset) | |
610 | { | |
611 | u_char *p; | |
612 | int have, ret; | |
613 | ||
614 | have = buffer_len(&c->input); | |
615 | ||
616 | debug2("channel %d: pre_dynamic: have %d", c->self, have); | |
070adba2 | 617 | /* buffer_dump(&c->input); */ |
28b9cb4d | 618 | /* check if the fixed size part of the packet is in buffer. */ |
619 | if (have < 4) { | |
620 | /* need more */ | |
621 | FD_SET(c->sock, readset); | |
622 | return; | |
623 | } | |
624 | /* try to guess the protocol */ | |
625 | p = buffer_ptr(&c->input); | |
626 | switch (p[0]) { | |
6683b40f | 627 | case 0x04: |
628 | ret = channel_decode_socks4(c, readset, writeset); | |
629 | break; | |
28b9cb4d | 630 | default: |
631 | ret = -1; | |
632 | break; | |
633 | } | |
634 | if (ret < 0) { | |
719fc62f | 635 | chan_mark_dead(c); |
28b9cb4d | 636 | } else if (ret == 0) { |
637 | debug2("channel %d: pre_dynamic: need more", c->self); | |
638 | /* need more */ | |
639 | FD_SET(c->sock, readset); | |
640 | } else { | |
641 | /* switch to the next state */ | |
642 | c->type = SSH_CHANNEL_OPENING; | |
643 | port_open_helper(c, "direct-tcpip"); | |
644 | } | |
645 | } | |
0490e609 | 646 | |
7368a6c8 | 647 | /* This is our fake X11 server socket. */ |
648 | void | |
649 | channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset) | |
650 | { | |
719fc62f | 651 | Channel *nc; |
7368a6c8 | 652 | struct sockaddr addr; |
719fc62f | 653 | int newsock; |
7368a6c8 | 654 | socklen_t addrlen; |
865ac82e | 655 | char buf[16384], *remote_ipaddr; |
0b242b12 | 656 | int remote_port; |
7368a6c8 | 657 | |
658 | if (FD_ISSET(c->sock, readset)) { | |
659 | debug("X11 connection requested."); | |
660 | addrlen = sizeof(addr); | |
661 | newsock = accept(c->sock, &addr, &addrlen); | |
662 | if (newsock < 0) { | |
663 | error("accept: %.100s", strerror(errno)); | |
664 | return; | |
5260325f | 665 | } |
865ac82e | 666 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 667 | remote_port = get_peer_port(newsock); |
7368a6c8 | 668 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 669 | remote_ipaddr, remote_port); |
0b242b12 | 670 | |
719fc62f | 671 | nc = channel_new("accepted x11 socket", |
0b242b12 | 672 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
673 | c->local_window_max, c->local_maxpacket, | |
a22aff1f | 674 | 0, xstrdup(buf), 1); |
719fc62f | 675 | if (nc == NULL) { |
676 | close(newsock); | |
677 | xfree(remote_ipaddr); | |
678 | return; | |
679 | } | |
0b242b12 | 680 | if (compat20) { |
681 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
682 | packet_put_cstring("x11"); | |
719fc62f | 683 | packet_put_int(nc->self); |
0b242b12 | 684 | packet_put_int(c->local_window_max); |
685 | packet_put_int(c->local_maxpacket); | |
865ac82e | 686 | /* originator ipaddr and port */ |
687 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 688 | if (datafellows & SSH_BUG_X11FWD) { |
689 | debug("ssh2 x11 bug compat mode"); | |
690 | } else { | |
691 | packet_put_int(remote_port); | |
692 | } | |
0b242b12 | 693 | packet_send(); |
694 | } else { | |
695 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 696 | packet_put_int(nc->self); |
0b242b12 | 697 | if (have_hostname_in_open) |
698 | packet_put_string(buf, strlen(buf)); | |
699 | packet_send(); | |
700 | } | |
865ac82e | 701 | xfree(remote_ipaddr); |
8efc0c15 | 702 | } |
8efc0c15 | 703 | } |
704 | ||
0490e609 | 705 | void |
706 | port_open_helper(Channel *c, char *rtype) | |
707 | { | |
708 | int direct; | |
709 | char buf[1024]; | |
710 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
711 | u_short remote_port = get_peer_port(c->sock); | |
712 | ||
713 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
714 | ||
715 | snprintf(buf, sizeof buf, | |
716 | "%s: listening port %d for %.100s port %d, " | |
717 | "connect from %.200s port %d", | |
718 | rtype, c->listening_port, c->path, c->host_port, | |
719 | remote_ipaddr, remote_port); | |
720 | ||
721 | xfree(c->remote_name); | |
722 | c->remote_name = xstrdup(buf); | |
723 | ||
724 | if (compat20) { | |
725 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
726 | packet_put_cstring(rtype); | |
727 | packet_put_int(c->self); | |
728 | packet_put_int(c->local_window_max); | |
729 | packet_put_int(c->local_maxpacket); | |
730 | if (direct) { | |
731 | /* target host, port */ | |
732 | packet_put_cstring(c->path); | |
733 | packet_put_int(c->host_port); | |
734 | } else { | |
735 | /* listen address, port */ | |
736 | packet_put_cstring(c->path); | |
737 | packet_put_int(c->listening_port); | |
738 | } | |
739 | /* originator host and port */ | |
740 | packet_put_cstring(remote_ipaddr); | |
741 | packet_put_int(remote_port); | |
742 | packet_send(); | |
743 | } else { | |
744 | packet_start(SSH_MSG_PORT_OPEN); | |
745 | packet_put_int(c->self); | |
746 | packet_put_cstring(c->path); | |
747 | packet_put_int(c->host_port); | |
748 | if (have_hostname_in_open) | |
749 | packet_put_cstring(c->remote_name); | |
750 | packet_send(); | |
751 | } | |
752 | xfree(remote_ipaddr); | |
753 | } | |
754 | ||
aa3378df | 755 | /* |
7368a6c8 | 756 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 757 | */ |
7368a6c8 | 758 | void |
759 | channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset) | |
760 | { | |
0490e609 | 761 | Channel *nc; |
7368a6c8 | 762 | struct sockaddr addr; |
719fc62f | 763 | int newsock, nextstate; |
7368a6c8 | 764 | socklen_t addrlen; |
0490e609 | 765 | char *rtype; |
fa08c86b | 766 | |
7368a6c8 | 767 | if (FD_ISSET(c->sock, readset)) { |
768 | debug("Connection to port %d forwarding " | |
769 | "to %.100s port %d requested.", | |
770 | c->listening_port, c->path, c->host_port); | |
0490e609 | 771 | |
772 | rtype = (c->type == SSH_CHANNEL_RPORT_LISTENER) ? | |
773 | "forwarded-tcpip" : "direct-tcpip"; | |
97430469 | 774 | nextstate = (c->host_port == 0 && |
775 | c->type != SSH_CHANNEL_RPORT_LISTENER) ? | |
776 | SSH_CHANNEL_DYNAMIC : SSH_CHANNEL_OPENING; | |
0490e609 | 777 | |
7368a6c8 | 778 | addrlen = sizeof(addr); |
779 | newsock = accept(c->sock, &addr, &addrlen); | |
780 | if (newsock < 0) { | |
781 | error("accept: %.100s", strerror(errno)); | |
782 | return; | |
783 | } | |
719fc62f | 784 | nc = channel_new(rtype, |
0490e609 | 785 | nextstate, newsock, newsock, -1, |
7368a6c8 | 786 | c->local_window_max, c->local_maxpacket, |
0490e609 | 787 | 0, xstrdup(rtype), 1); |
0490e609 | 788 | if (nc == NULL) { |
719fc62f | 789 | error("channel_post_port_listener: no new channel:"); |
790 | close(newsock); | |
0490e609 | 791 | return; |
7368a6c8 | 792 | } |
0490e609 | 793 | nc->listening_port = c->listening_port; |
794 | nc->host_port = c->host_port; | |
795 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
796 | ||
797 | if (nextstate != SSH_CHANNEL_DYNAMIC) | |
798 | port_open_helper(nc, rtype); | |
7368a6c8 | 799 | } |
800 | } | |
8efc0c15 | 801 | |
7368a6c8 | 802 | /* |
803 | * This is the authentication agent socket listening for connections from | |
804 | * clients. | |
805 | */ | |
806 | void | |
807 | channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset) | |
8efc0c15 | 808 | { |
719fc62f | 809 | Channel *nc; |
810 | int newsock; | |
5260325f | 811 | struct sockaddr addr; |
48e671d5 | 812 | socklen_t addrlen; |
5260325f | 813 | |
7368a6c8 | 814 | if (FD_ISSET(c->sock, readset)) { |
815 | addrlen = sizeof(addr); | |
816 | newsock = accept(c->sock, &addr, &addrlen); | |
817 | if (newsock < 0) { | |
818 | error("accept from auth socket: %.100s", strerror(errno)); | |
819 | return; | |
820 | } | |
719fc62f | 821 | nc = channel_new("accepted auth socket", |
fa08c86b | 822 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
823 | c->local_window_max, c->local_maxpacket, | |
824 | 0, xstrdup("accepted auth socket"), 1); | |
719fc62f | 825 | if (nc == NULL) { |
826 | error("channel_post_auth_listener: channel_new failed"); | |
827 | close(newsock); | |
828 | } | |
fa08c86b | 829 | if (compat20) { |
830 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
831 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 832 | packet_put_int(nc->self); |
fa08c86b | 833 | packet_put_int(c->local_window_max); |
834 | packet_put_int(c->local_maxpacket); | |
835 | } else { | |
836 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 837 | packet_put_int(nc->self); |
fa08c86b | 838 | } |
7368a6c8 | 839 | packet_send(); |
840 | } | |
841 | } | |
5260325f | 842 | |
97fb6912 | 843 | void |
844 | channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset) | |
845 | { | |
d18e0850 | 846 | int err = 0; |
847 | int sz = sizeof(err); | |
848 | ||
97fb6912 | 849 | if (FD_ISSET(c->sock, writeset)) { |
d18e0850 | 850 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err, |
851 | &sz) < 0) { | |
852 | err = errno; | |
853 | error("getsockopt SO_ERROR failed"); | |
854 | } | |
855 | if (err == 0) { | |
856 | debug("channel %d: connected", c->self); | |
857 | c->type = SSH_CHANNEL_OPEN; | |
858 | if (compat20) { | |
859 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
860 | packet_put_int(c->remote_id); | |
861 | packet_put_int(c->self); | |
862 | packet_put_int(c->local_window); | |
863 | packet_put_int(c->local_maxpacket); | |
864 | } else { | |
865 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
866 | packet_put_int(c->remote_id); | |
867 | packet_put_int(c->self); | |
868 | } | |
97fb6912 | 869 | } else { |
d18e0850 | 870 | debug("channel %d: not connected: %s", |
871 | c->self, strerror(err)); | |
872 | if (compat20) { | |
873 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
874 | packet_put_int(c->remote_id); | |
875 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
876 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
877 | packet_put_cstring(strerror(err)); | |
878 | packet_put_cstring(""); | |
879 | } | |
97fb6912 | 880 | } else { |
d18e0850 | 881 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
882 | packet_put_int(c->remote_id); | |
97fb6912 | 883 | } |
d18e0850 | 884 | chan_mark_dead(c); |
97fb6912 | 885 | } |
d18e0850 | 886 | packet_send(); |
97fb6912 | 887 | } |
888 | } | |
889 | ||
7368a6c8 | 890 | int |
891 | channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset) | |
892 | { | |
893 | char buf[16*1024]; | |
894 | int len; | |
895 | ||
7231bd47 | 896 | if (c->istate == CHAN_INPUT_OPEN && |
7368a6c8 | 897 | FD_ISSET(c->rfd, readset)) { |
898 | len = read(c->rfd, buf, sizeof(buf)); | |
0fbe8c74 | 899 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
900 | return 1; | |
7368a6c8 | 901 | if (len <= 0) { |
0b242b12 | 902 | debug("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 903 | c->self, c->rfd, len); |
28b9cb4d | 904 | if (c->type != SSH_CHANNEL_OPEN) { |
905 | debug("channel %d: not open", c->self); | |
719fc62f | 906 | chan_mark_dead(c); |
0490e609 | 907 | return -1; |
28b9cb4d | 908 | } else if (compat13) { |
7368a6c8 | 909 | buffer_consume(&c->output, buffer_len(&c->output)); |
910 | c->type = SSH_CHANNEL_INPUT_DRAINING; | |
070adba2 | 911 | debug("channel %d: status set to input draining.", c->self); |
7368a6c8 | 912 | } else { |
913 | chan_read_failed(c); | |
5260325f | 914 | } |
7368a6c8 | 915 | return -1; |
916 | } | |
2e73a022 | 917 | if(c->input_filter != NULL) { |
918 | if (c->input_filter(c, buf, len) == -1) { | |
070adba2 | 919 | debug("channel %d: filter stops", c->self); |
2e73a022 | 920 | chan_read_failed(c); |
921 | } | |
922 | } else { | |
923 | buffer_append(&c->input, buf, len); | |
924 | } | |
7368a6c8 | 925 | } |
926 | return 1; | |
927 | } | |
928 | int | |
929 | channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset) | |
930 | { | |
95ce5599 | 931 | struct termios tio; |
7368a6c8 | 932 | int len; |
933 | ||
934 | /* Send buffered output data to the socket. */ | |
7231bd47 | 935 | if ((c->ostate == CHAN_OUTPUT_OPEN || |
936 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) && | |
7368a6c8 | 937 | FD_ISSET(c->wfd, writeset) && |
938 | buffer_len(&c->output) > 0) { | |
939 | len = write(c->wfd, buffer_ptr(&c->output), | |
0fbe8c74 | 940 | buffer_len(&c->output)); |
941 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
942 | return 1; | |
7368a6c8 | 943 | if (len <= 0) { |
28b9cb4d | 944 | if (c->type != SSH_CHANNEL_OPEN) { |
945 | debug("channel %d: not open", c->self); | |
719fc62f | 946 | chan_mark_dead(c); |
28b9cb4d | 947 | return -1; |
948 | } else if (compat13) { | |
7368a6c8 | 949 | buffer_consume(&c->output, buffer_len(&c->output)); |
070adba2 | 950 | debug("channel %d: status set to input draining.", c->self); |
7368a6c8 | 951 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
952 | } else { | |
953 | chan_write_failed(c); | |
5260325f | 954 | } |
7368a6c8 | 955 | return -1; |
956 | } | |
0ae4fe1d | 957 | if (compat20 && c->isatty) { |
0ae4fe1d | 958 | if (tcgetattr(c->wfd, &tio) == 0 && |
959 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
960 | /* | |
961 | * Simulate echo to reduce the impact of | |
355724fc | 962 | * traffic analysis. We need to match the |
95ce5599 | 963 | * size of a SSH2_MSG_CHANNEL_DATA message |
964 | * (4 byte channel id + data) | |
0ae4fe1d | 965 | */ |
95ce5599 | 966 | packet_send_ignore(4 + len); |
0ae4fe1d | 967 | packet_send(); |
0ae4fe1d | 968 | } |
969 | } | |
7368a6c8 | 970 | buffer_consume(&c->output, len); |
7e7327a1 | 971 | if (compat20 && len > 0) { |
972 | c->local_consumed += len; | |
973 | } | |
974 | } | |
975 | return 1; | |
976 | } | |
977 | int | |
978 | channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset) | |
979 | { | |
980 | char buf[16*1024]; | |
981 | int len; | |
982 | ||
8ce64345 | 983 | /** XXX handle drain efd, too */ |
7e7327a1 | 984 | if (c->efd != -1) { |
985 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
986 | FD_ISSET(c->efd, writeset) && | |
987 | buffer_len(&c->extended) > 0) { | |
988 | len = write(c->efd, buffer_ptr(&c->extended), | |
989 | buffer_len(&c->extended)); | |
de273eef | 990 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 991 | c->self, len, c->efd); |
ee55dacf | 992 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
993 | return 1; | |
994 | if (len <= 0) { | |
995 | debug2("channel %d: closing write-efd %d", | |
996 | c->self, c->efd); | |
997 | close(c->efd); | |
998 | c->efd = -1; | |
999 | } else { | |
7e7327a1 | 1000 | buffer_consume(&c->extended, len); |
1001 | c->local_consumed += len; | |
1002 | } | |
1003 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
1004 | FD_ISSET(c->efd, readset)) { | |
1005 | len = read(c->efd, buf, sizeof(buf)); | |
de273eef | 1006 | debug2("channel %d: read %d from efd %d", |
7e7327a1 | 1007 | c->self, len, c->efd); |
ee55dacf | 1008 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1009 | return 1; | |
1010 | if (len <= 0) { | |
1011 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1012 | c->self, c->efd); |
1013 | close(c->efd); | |
1014 | c->efd = -1; | |
ee55dacf | 1015 | } else { |
7e7327a1 | 1016 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1017 | } |
7e7327a1 | 1018 | } |
1019 | } | |
1020 | return 1; | |
1021 | } | |
1022 | int | |
ee55dacf | 1023 | channel_check_window(Channel *c) |
7e7327a1 | 1024 | { |
28b9cb4d | 1025 | if (c->type == SSH_CHANNEL_OPEN && |
1026 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
7e7327a1 | 1027 | c->local_window < c->local_window_max/2 && |
1028 | c->local_consumed > 0) { | |
1029 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1030 | packet_put_int(c->remote_id); | |
1031 | packet_put_int(c->local_consumed); | |
1032 | packet_send(); | |
de273eef | 1033 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1034 | c->self, c->local_window, |
1035 | c->local_consumed); | |
1036 | c->local_window += c->local_consumed; | |
1037 | c->local_consumed = 0; | |
7368a6c8 | 1038 | } |
1039 | return 1; | |
1040 | } | |
5260325f | 1041 | |
7368a6c8 | 1042 | void |
1043 | channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset) | |
1044 | { | |
1045 | channel_handle_rfd(c, readset, writeset); | |
1046 | channel_handle_wfd(c, readset, writeset); | |
1047 | } | |
aa3378df | 1048 | |
7e7327a1 | 1049 | void |
1050 | channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset) | |
1051 | { | |
1052 | channel_handle_rfd(c, readset, writeset); | |
1053 | channel_handle_wfd(c, readset, writeset); | |
1054 | channel_handle_efd(c, readset, writeset); | |
ee55dacf | 1055 | |
1056 | channel_check_window(c); | |
7e7327a1 | 1057 | } |
1058 | ||
7368a6c8 | 1059 | void |
1060 | channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset) | |
1061 | { | |
1062 | int len; | |
1063 | /* Send buffered output data to the socket. */ | |
1064 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1065 | len = write(c->sock, buffer_ptr(&c->output), | |
1066 | buffer_len(&c->output)); | |
1067 | if (len <= 0) | |
1068 | buffer_consume(&c->output, buffer_len(&c->output)); | |
1069 | else | |
1070 | buffer_consume(&c->output, len); | |
1071 | } | |
1072 | } | |
5260325f | 1073 | |
7e7327a1 | 1074 | void |
1075 | channel_handler_init_20(void) | |
1076 | { | |
1077 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20; | |
0b242b12 | 1078 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1079 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1080 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1081 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1082 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1083 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1084 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1085 | |
1086 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2; | |
1087 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
fa08c86b | 1088 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1089 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1090 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1091 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
28b9cb4d | 1092 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_2; |
7e7327a1 | 1093 | } |
1094 | ||
7368a6c8 | 1095 | void |
1096 | channel_handler_init_13(void) | |
1097 | { | |
1098 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1099 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1100 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1101 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1102 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1103 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1104 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1105 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1106 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1107 | |
1108 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; | |
1109 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1110 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1111 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1112 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1113 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
28b9cb4d | 1114 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1; |
7368a6c8 | 1115 | } |
5260325f | 1116 | |
7368a6c8 | 1117 | void |
1118 | channel_handler_init_15(void) | |
1119 | { | |
1120 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15; | |
0b242b12 | 1121 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1122 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1123 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1124 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1125 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1126 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1127 | |
1128 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1129 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1130 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1131 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; | |
97fb6912 | 1132 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
28b9cb4d | 1133 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1; |
7368a6c8 | 1134 | } |
1135 | ||
1136 | void | |
1137 | channel_handler_init(void) | |
1138 | { | |
1139 | int i; | |
1140 | for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { | |
1141 | channel_pre[i] = NULL; | |
1142 | channel_post[i] = NULL; | |
1143 | } | |
7e7327a1 | 1144 | if (compat20) |
1145 | channel_handler_init_20(); | |
1146 | else if (compat13) | |
7368a6c8 | 1147 | channel_handler_init_13(); |
1148 | else | |
1149 | channel_handler_init_15(); | |
1150 | } | |
1151 | ||
6ae2364d | 1152 | void |
7368a6c8 | 1153 | channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset) |
1154 | { | |
1155 | static int did_init = 0; | |
1156 | int i; | |
1157 | Channel *c; | |
1158 | ||
1159 | if (!did_init) { | |
1160 | channel_handler_init(); | |
1161 | did_init = 1; | |
1162 | } | |
1163 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1164 | c = channels[i]; |
1165 | if (c == NULL) | |
5260325f | 1166 | continue; |
7368a6c8 | 1167 | if (ftab[c->type] == NULL) |
1168 | continue; | |
1169 | (*ftab[c->type])(c, readset, writeset); | |
ee55dacf | 1170 | if (chan_is_dead(c)) { |
1171 | /* | |
1172 | * we have to remove the fd's from the select mask | |
1173 | * before the channels are free'd and the fd's are | |
1174 | * closed | |
1175 | */ | |
1176 | if (c->wfd != -1) | |
1177 | FD_CLR(c->wfd, writeset); | |
1178 | if (c->rfd != -1) | |
1179 | FD_CLR(c->rfd, readset); | |
1180 | if (c->efd != -1) { | |
1181 | if (c->extended_usage == CHAN_EXTENDED_READ) | |
1182 | FD_CLR(c->efd, readset); | |
1183 | if (c->extended_usage == CHAN_EXTENDED_WRITE) | |
1184 | FD_CLR(c->efd, writeset); | |
1185 | } | |
719fc62f | 1186 | channel_free(c); |
ee55dacf | 1187 | } |
8efc0c15 | 1188 | } |
8efc0c15 | 1189 | } |
1190 | ||
6ae2364d | 1191 | void |
c422989b | 1192 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
1193 | int rekeying) | |
7368a6c8 | 1194 | { |
39929cdb | 1195 | int n; |
1196 | u_int sz; | |
1197 | ||
1198 | n = MAX(*maxfdp, channel_max_fd); | |
1199 | ||
1200 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
1201 | if (*readsetp == NULL || n > *maxfdp) { | |
1202 | if (*readsetp) | |
1203 | xfree(*readsetp); | |
1204 | if (*writesetp) | |
1205 | xfree(*writesetp); | |
1206 | *readsetp = xmalloc(sz); | |
1207 | *writesetp = xmalloc(sz); | |
1208 | *maxfdp = n; | |
1209 | } | |
1210 | memset(*readsetp, 0, sz); | |
1211 | memset(*writesetp, 0, sz); | |
1212 | ||
c422989b | 1213 | if (!rekeying) |
1214 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1215 | } |
1216 | ||
6ae2364d | 1217 | void |
7368a6c8 | 1218 | channel_after_select(fd_set * readset, fd_set * writeset) |
1219 | { | |
1220 | channel_handler(channel_post, readset, writeset); | |
1221 | } | |
1222 | ||
39929cdb | 1223 | /* If there is data to send to the connection, enqueue some of it now. */ |
8efc0c15 | 1224 | |
6ae2364d | 1225 | void |
5260325f | 1226 | channel_output_poll() |
8efc0c15 | 1227 | { |
5260325f | 1228 | int len, i; |
7368a6c8 | 1229 | Channel *c; |
5260325f | 1230 | |
1231 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1232 | |
1233 | c = channels[i]; | |
1234 | if (c == NULL) | |
1235 | continue; | |
48e671d5 | 1236 | |
aa3378df | 1237 | /* We are only interested in channels that can have buffered incoming data. */ |
48e671d5 | 1238 | if (compat13) { |
7368a6c8 | 1239 | if (c->type != SSH_CHANNEL_OPEN && |
1240 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1241 | continue; |
1242 | } else { | |
7368a6c8 | 1243 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1244 | continue; |
48e671d5 | 1245 | } |
e78a59f5 | 1246 | if (compat20 && |
1247 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1248 | /* XXX is this true? */ |
61f8a1d1 | 1249 | debug2("channel %d: no data after CLOSE", c->self); |
7e7327a1 | 1250 | continue; |
1251 | } | |
5260325f | 1252 | |
1253 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1254 | if ((c->istate == CHAN_INPUT_OPEN || |
1255 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1256 | (len = buffer_len(&c->input)) > 0) { | |
aa3378df | 1257 | /* Send some data for the other side over the secure connection. */ |
7e7327a1 | 1258 | if (compat20) { |
1259 | if (len > c->remote_window) | |
1260 | len = c->remote_window; | |
1261 | if (len > c->remote_maxpacket) | |
1262 | len = c->remote_maxpacket; | |
5260325f | 1263 | } else { |
7e7327a1 | 1264 | if (packet_is_interactive()) { |
1265 | if (len > 1024) | |
1266 | len = 512; | |
1267 | } else { | |
1268 | /* Keep the packets at reasonable size. */ | |
1269 | if (len > packet_get_maxsize()/2) | |
1270 | len = packet_get_maxsize()/2; | |
1271 | } | |
5260325f | 1272 | } |
7368a6c8 | 1273 | if (len > 0) { |
7e7327a1 | 1274 | packet_start(compat20 ? |
1275 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1276 | packet_put_int(c->remote_id); |
1277 | packet_put_string(buffer_ptr(&c->input), len); | |
1278 | packet_send(); | |
1279 | buffer_consume(&c->input, len); | |
1280 | c->remote_window -= len; | |
7368a6c8 | 1281 | } |
1282 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1283 | if (compat13) |
1284 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1285 | /* |
1286 | * input-buffer is empty and read-socket shutdown: | |
1287 | * tell peer, that we will not send more data: send IEOF | |
1288 | */ | |
7368a6c8 | 1289 | chan_ibuf_empty(c); |
5260325f | 1290 | } |
7e7327a1 | 1291 | /* Send extended data, i.e. stderr */ |
1292 | if (compat20 && | |
1293 | c->remote_window > 0 && | |
1294 | (len = buffer_len(&c->extended)) > 0 && | |
1295 | c->extended_usage == CHAN_EXTENDED_READ) { | |
ee55dacf | 1296 | debug2("channel %d: rwin %d elen %d euse %d", |
1297 | c->self, c->remote_window, buffer_len(&c->extended), | |
1298 | c->extended_usage); | |
7e7327a1 | 1299 | if (len > c->remote_window) |
1300 | len = c->remote_window; | |
1301 | if (len > c->remote_maxpacket) | |
1302 | len = c->remote_maxpacket; | |
1303 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1304 | packet_put_int(c->remote_id); | |
1305 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1306 | packet_put_string(buffer_ptr(&c->extended), len); | |
1307 | packet_send(); | |
1308 | buffer_consume(&c->extended, len); | |
1309 | c->remote_window -= len; | |
ee55dacf | 1310 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 1311 | } |
8efc0c15 | 1312 | } |
8efc0c15 | 1313 | } |
1314 | ||
aa3378df | 1315 | /* |
1316 | * This is called when a packet of type CHANNEL_DATA has just been received. | |
1317 | * The message type has already been consumed, but channel number and data is | |
1318 | * still there. | |
1319 | */ | |
8efc0c15 | 1320 | |
6ae2364d | 1321 | void |
188adeb2 | 1322 | channel_input_data(int type, int plen, void *ctxt) |
8efc0c15 | 1323 | { |
48e671d5 | 1324 | int id; |
5260325f | 1325 | char *data; |
1e3b8b07 | 1326 | u_int data_len; |
7368a6c8 | 1327 | Channel *c; |
5260325f | 1328 | |
1329 | /* Get the channel number and verify it. */ | |
48e671d5 | 1330 | id = packet_get_int(); |
7368a6c8 | 1331 | c = channel_lookup(id); |
1332 | if (c == NULL) | |
48e671d5 | 1333 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 1334 | |
1335 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 1336 | if (c->type != SSH_CHANNEL_OPEN && |
1337 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 1338 | return; |
1339 | ||
1340 | /* same for protocol 1.5 if output end is no longer open */ | |
7368a6c8 | 1341 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) |
5260325f | 1342 | return; |
1343 | ||
1344 | /* Get the data. */ | |
1345 | data = packet_get_string(&data_len); | |
6ae2364d | 1346 | packet_done(); |
7368a6c8 | 1347 | |
7e7327a1 | 1348 | if (compat20){ |
1349 | if (data_len > c->local_maxpacket) { | |
1350 | log("channel %d: rcvd big packet %d, maxpack %d", | |
1351 | c->self, data_len, c->local_maxpacket); | |
1352 | } | |
1353 | if (data_len > c->local_window) { | |
1354 | log("channel %d: rcvd too much data %d, win %d", | |
1355 | c->self, data_len, c->local_window); | |
1356 | xfree(data); | |
1357 | return; | |
1358 | } | |
1359 | c->local_window -= data_len; | |
1360 | }else{ | |
1361 | packet_integrity_check(plen, 4 + 4 + data_len, type); | |
1362 | } | |
7368a6c8 | 1363 | buffer_append(&c->output, data, data_len); |
5260325f | 1364 | xfree(data); |
8efc0c15 | 1365 | } |
6ae2364d | 1366 | void |
188adeb2 | 1367 | channel_input_extended_data(int type, int plen, void *ctxt) |
7e7327a1 | 1368 | { |
1369 | int id; | |
1370 | int tcode; | |
1371 | char *data; | |
1e3b8b07 | 1372 | u_int data_len; |
7e7327a1 | 1373 | Channel *c; |
1374 | ||
1375 | /* Get the channel number and verify it. */ | |
1376 | id = packet_get_int(); | |
1377 | c = channel_lookup(id); | |
1378 | ||
1379 | if (c == NULL) | |
1380 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
1381 | if (c->type != SSH_CHANNEL_OPEN) { | |
1382 | log("channel %d: ext data for non open", id); | |
1383 | return; | |
1384 | } | |
1385 | tcode = packet_get_int(); | |
1386 | if (c->efd == -1 || | |
1387 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
1388 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
1389 | log("channel %d: bad ext data", c->self); | |
1390 | return; | |
1391 | } | |
1392 | data = packet_get_string(&data_len); | |
6ae2364d | 1393 | packet_done(); |
7e7327a1 | 1394 | if (data_len > c->local_window) { |
1395 | log("channel %d: rcvd too much extended_data %d, win %d", | |
1396 | c->self, data_len, c->local_window); | |
1397 | xfree(data); | |
1398 | return; | |
1399 | } | |
de273eef | 1400 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 1401 | c->local_window -= data_len; |
1402 | buffer_append(&c->extended, data, data_len); | |
1403 | xfree(data); | |
1404 | } | |
1405 | ||
8efc0c15 | 1406 | |
aa3378df | 1407 | /* |
1408 | * Returns true if no channel has too much buffered data, and false if one or | |
1409 | * more channel is overfull. | |
1410 | */ | |
8efc0c15 | 1411 | |
6ae2364d | 1412 | int |
5260325f | 1413 | channel_not_very_much_buffered_data() |
8efc0c15 | 1414 | { |
1e3b8b07 | 1415 | u_int i; |
7368a6c8 | 1416 | Channel *c; |
5260325f | 1417 | |
1418 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1419 | c = channels[i]; |
1420 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
7e7327a1 | 1421 | if (!compat20 && buffer_len(&c->input) > packet_get_maxsize()) { |
7368a6c8 | 1422 | debug("channel %d: big input buffer %d", |
1423 | c->self, buffer_len(&c->input)); | |
5260325f | 1424 | return 0; |
7368a6c8 | 1425 | } |
1426 | if (buffer_len(&c->output) > packet_get_maxsize()) { | |
1427 | debug("channel %d: big output buffer %d", | |
1428 | c->self, buffer_len(&c->output)); | |
5260325f | 1429 | return 0; |
7368a6c8 | 1430 | } |
5260325f | 1431 | } |
8efc0c15 | 1432 | } |
5260325f | 1433 | return 1; |
8efc0c15 | 1434 | } |
1435 | ||
6ae2364d | 1436 | void |
188adeb2 | 1437 | channel_input_ieof(int type, int plen, void *ctxt) |
7368a6c8 | 1438 | { |
1439 | int id; | |
1440 | Channel *c; | |
1441 | ||
1442 | packet_integrity_check(plen, 4, type); | |
1443 | ||
1444 | id = packet_get_int(); | |
1445 | c = channel_lookup(id); | |
1446 | if (c == NULL) | |
1447 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
1448 | chan_rcvd_ieof(c); | |
1449 | } | |
8efc0c15 | 1450 | |
6ae2364d | 1451 | void |
188adeb2 | 1452 | channel_input_close(int type, int plen, void *ctxt) |
8efc0c15 | 1453 | { |
7368a6c8 | 1454 | int id; |
1455 | Channel *c; | |
5260325f | 1456 | |
7368a6c8 | 1457 | packet_integrity_check(plen, 4, type); |
1458 | ||
1459 | id = packet_get_int(); | |
1460 | c = channel_lookup(id); | |
1461 | if (c == NULL) | |
1462 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 1463 | |
1464 | /* | |
1465 | * Send a confirmation that we have closed the channel and no more | |
1466 | * data is coming for it. | |
1467 | */ | |
5260325f | 1468 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 1469 | packet_put_int(c->remote_id); |
5260325f | 1470 | packet_send(); |
1471 | ||
aa3378df | 1472 | /* |
1473 | * If the channel is in closed state, we have sent a close request, | |
1474 | * and the other side will eventually respond with a confirmation. | |
1475 | * Thus, we cannot free the channel here, because then there would be | |
1476 | * no-one to receive the confirmation. The channel gets freed when | |
1477 | * the confirmation arrives. | |
1478 | */ | |
7368a6c8 | 1479 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 1480 | /* |
1481 | * Not a closed channel - mark it as draining, which will | |
1482 | * cause it to be freed later. | |
1483 | */ | |
7368a6c8 | 1484 | buffer_consume(&c->input, buffer_len(&c->input)); |
1485 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; | |
5260325f | 1486 | } |
8efc0c15 | 1487 | } |
1488 | ||
7368a6c8 | 1489 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
6ae2364d | 1490 | void |
188adeb2 | 1491 | channel_input_oclose(int type, int plen, void *ctxt) |
8efc0c15 | 1492 | { |
7368a6c8 | 1493 | int id = packet_get_int(); |
1494 | Channel *c = channel_lookup(id); | |
1495 | packet_integrity_check(plen, 4, type); | |
1496 | if (c == NULL) | |
1497 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
1498 | chan_rcvd_oclose(c); | |
8efc0c15 | 1499 | } |
1500 | ||
6ae2364d | 1501 | void |
188adeb2 | 1502 | channel_input_close_confirmation(int type, int plen, void *ctxt) |
7368a6c8 | 1503 | { |
1504 | int id = packet_get_int(); | |
1505 | Channel *c = channel_lookup(id); | |
1506 | ||
6ae2364d | 1507 | packet_done(); |
7368a6c8 | 1508 | if (c == NULL) |
1509 | packet_disconnect("Received close confirmation for " | |
1510 | "out-of-range channel %d.", id); | |
1511 | if (c->type != SSH_CHANNEL_CLOSED) | |
1512 | packet_disconnect("Received close confirmation for " | |
1513 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 1514 | channel_free(c); |
7368a6c8 | 1515 | } |
8efc0c15 | 1516 | |
6ae2364d | 1517 | void |
188adeb2 | 1518 | channel_input_open_confirmation(int type, int plen, void *ctxt) |
8efc0c15 | 1519 | { |
7368a6c8 | 1520 | int id, remote_id; |
1521 | Channel *c; | |
5260325f | 1522 | |
7e7327a1 | 1523 | if (!compat20) |
1524 | packet_integrity_check(plen, 4 + 4, type); | |
5260325f | 1525 | |
7368a6c8 | 1526 | id = packet_get_int(); |
1527 | c = channel_lookup(id); | |
5260325f | 1528 | |
7368a6c8 | 1529 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
1530 | packet_disconnect("Received open confirmation for " | |
1531 | "non-opening channel %d.", id); | |
1532 | remote_id = packet_get_int(); | |
aa3378df | 1533 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 1534 | c->remote_id = remote_id; |
1535 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 1536 | |
1537 | if (compat20) { | |
1538 | c->remote_window = packet_get_int(); | |
1539 | c->remote_maxpacket = packet_get_int(); | |
6ae2364d | 1540 | packet_done(); |
7e7327a1 | 1541 | if (c->cb_fn != NULL && c->cb_event == type) { |
de273eef | 1542 | debug2("callback start"); |
7e7327a1 | 1543 | c->cb_fn(c->self, c->cb_arg); |
de273eef | 1544 | debug2("callback done"); |
7e7327a1 | 1545 | } |
1546 | debug("channel %d: open confirm rwindow %d rmax %d", c->self, | |
1547 | c->remote_window, c->remote_maxpacket); | |
1548 | } | |
8efc0c15 | 1549 | } |
1550 | ||
d18e0850 | 1551 | char * |
1552 | reason2txt(int reason) | |
1553 | { | |
1554 | switch(reason) { | |
1555 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: | |
1556 | return "administratively prohibited"; | |
1557 | case SSH2_OPEN_CONNECT_FAILED: | |
1558 | return "connect failed"; | |
1559 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
1560 | return "unknown channel type"; | |
1561 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
1562 | return "resource shortage"; | |
1563 | } | |
7e8c18e9 | 1564 | return "unknown reason"; |
d18e0850 | 1565 | } |
1566 | ||
6ae2364d | 1567 | void |
188adeb2 | 1568 | channel_input_open_failure(int type, int plen, void *ctxt) |
8efc0c15 | 1569 | { |
02a024dd | 1570 | int id, reason; |
1571 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 1572 | Channel *c; |
5260325f | 1573 | |
7e7327a1 | 1574 | if (!compat20) |
1575 | packet_integrity_check(plen, 4, type); | |
7368a6c8 | 1576 | |
1577 | id = packet_get_int(); | |
1578 | c = channel_lookup(id); | |
1579 | ||
1580 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
1581 | packet_disconnect("Received open failure for " | |
1582 | "non-opening channel %d.", id); | |
7e7327a1 | 1583 | if (compat20) { |
02a024dd | 1584 | reason = packet_get_int(); |
fbe90f7b | 1585 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 1586 | msg = packet_get_string(NULL); |
1587 | lang = packet_get_string(NULL); | |
1588 | } | |
6ae2364d | 1589 | packet_done(); |
d18e0850 | 1590 | log("channel %d: open failed: %s%s%s", id, |
1591 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); | |
02a024dd | 1592 | if (msg != NULL) |
1593 | xfree(msg); | |
1594 | if (lang != NULL) | |
1595 | xfree(lang); | |
7e7327a1 | 1596 | } |
5260325f | 1597 | /* Free the channel. This will also close the socket. */ |
719fc62f | 1598 | channel_free(c); |
8efc0c15 | 1599 | } |
1600 | ||
7e7327a1 | 1601 | void |
188adeb2 | 1602 | channel_input_channel_request(int type, int plen, void *ctxt) |
7e7327a1 | 1603 | { |
1604 | int id; | |
1605 | Channel *c; | |
1606 | ||
1607 | id = packet_get_int(); | |
1608 | c = channel_lookup(id); | |
1609 | ||
1610 | if (c == NULL || | |
1611 | (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL)) | |
1612 | packet_disconnect("Received request for " | |
1613 | "non-open channel %d.", id); | |
1614 | if (c->cb_fn != NULL && c->cb_event == type) { | |
de273eef | 1615 | debug2("callback start"); |
7e7327a1 | 1616 | c->cb_fn(c->self, c->cb_arg); |
de273eef | 1617 | debug2("callback done"); |
7e7327a1 | 1618 | } else { |
1619 | char *service = packet_get_string(NULL); | |
94dfb550 | 1620 | debug("channel %d: rcvd request for %s", c->self, service); |
de273eef | 1621 | debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event); |
7e7327a1 | 1622 | xfree(service); |
1623 | } | |
1624 | } | |
1625 | ||
6ae2364d | 1626 | void |
188adeb2 | 1627 | channel_input_window_adjust(int type, int plen, void *ctxt) |
7e7327a1 | 1628 | { |
1629 | Channel *c; | |
1630 | int id, adjust; | |
1631 | ||
1632 | if (!compat20) | |
1633 | return; | |
1634 | ||
1635 | /* Get the channel number and verify it. */ | |
1636 | id = packet_get_int(); | |
1637 | c = channel_lookup(id); | |
1638 | ||
1639 | if (c == NULL || c->type != SSH_CHANNEL_OPEN) { | |
1640 | log("Received window adjust for " | |
1641 | "non-open channel %d.", id); | |
1642 | return; | |
1643 | } | |
1644 | adjust = packet_get_int(); | |
6ae2364d | 1645 | packet_done(); |
de273eef | 1646 | debug2("channel %d: rcvd adjust %d", id, adjust); |
7e7327a1 | 1647 | c->remote_window += adjust; |
1648 | } | |
1649 | ||
aa3378df | 1650 | /* |
1651 | * Stops listening for channels, and removes any unix domain sockets that we | |
1652 | * might have. | |
1653 | */ | |
8efc0c15 | 1654 | |
6ae2364d | 1655 | void |
5260325f | 1656 | channel_stop_listening() |
8efc0c15 | 1657 | { |
5260325f | 1658 | int i; |
719fc62f | 1659 | Channel *c; |
1660 | ||
5260325f | 1661 | for (i = 0; i < channels_alloc; i++) { |
719fc62f | 1662 | c = channels[i]; |
1663 | if (c != NULL) { | |
1664 | switch (c->type) { | |
1665 | case SSH_CHANNEL_AUTH_SOCKET: | |
1666 | close(c->sock); | |
1667 | unlink(c->path); | |
1668 | channel_free(c); | |
1669 | break; | |
1670 | case SSH_CHANNEL_PORT_LISTENER: | |
1671 | case SSH_CHANNEL_RPORT_LISTENER: | |
1672 | case SSH_CHANNEL_X11_LISTENER: | |
1673 | close(c->sock); | |
1674 | channel_free(c); | |
1675 | break; | |
1676 | default: | |
1677 | break; | |
1678 | } | |
5260325f | 1679 | } |
8efc0c15 | 1680 | } |
8efc0c15 | 1681 | } |
1682 | ||
aa3378df | 1683 | /* |
0fbe8c74 | 1684 | * Closes the sockets/fds of all channels. This is used to close extra file |
aa3378df | 1685 | * descriptors after a fork. |
1686 | */ | |
8efc0c15 | 1687 | |
6ae2364d | 1688 | void |
5260325f | 1689 | channel_close_all() |
8efc0c15 | 1690 | { |
5260325f | 1691 | int i; |
719fc62f | 1692 | |
0fbe8c74 | 1693 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 1694 | if (channels[i] != NULL) |
1695 | channel_close_fds(channels[i]); | |
8efc0c15 | 1696 | } |
1697 | ||
8efc0c15 | 1698 | /* Returns true if any channel is still open. */ |
1699 | ||
6ae2364d | 1700 | int |
5260325f | 1701 | channel_still_open() |
8efc0c15 | 1702 | { |
719fc62f | 1703 | int i; |
1704 | Channel *c; | |
1705 | ||
1706 | for (i = 0; i < channels_alloc; i++) { | |
1707 | c = channels[i]; | |
1708 | if (c == NULL) | |
1709 | continue; | |
1710 | switch (c->type) { | |
5260325f | 1711 | case SSH_CHANNEL_X11_LISTENER: |
1712 | case SSH_CHANNEL_PORT_LISTENER: | |
fa08c86b | 1713 | case SSH_CHANNEL_RPORT_LISTENER: |
5260325f | 1714 | case SSH_CHANNEL_CLOSED: |
1715 | case SSH_CHANNEL_AUTH_SOCKET: | |
0490e609 | 1716 | case SSH_CHANNEL_DYNAMIC: |
d18e0850 | 1717 | case SSH_CHANNEL_CONNECTING: |
5260325f | 1718 | continue; |
7e7327a1 | 1719 | case SSH_CHANNEL_LARVAL: |
1720 | if (!compat20) | |
1721 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
1722 | continue; | |
5260325f | 1723 | case SSH_CHANNEL_OPENING: |
1724 | case SSH_CHANNEL_OPEN: | |
1725 | case SSH_CHANNEL_X11_OPEN: | |
1726 | return 1; | |
1727 | case SSH_CHANNEL_INPUT_DRAINING: | |
1728 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
1729 | if (!compat13) | |
1730 | fatal("cannot happen: OUT_DRAIN"); | |
1731 | return 1; | |
1732 | default: | |
719fc62f | 1733 | fatal("channel_still_open: bad channel type %d", c->type); |
5260325f | 1734 | /* NOTREACHED */ |
1735 | } | |
719fc62f | 1736 | } |
5260325f | 1737 | return 0; |
8efc0c15 | 1738 | } |
1739 | ||
3ffc6336 | 1740 | /* Returns the id of an open channel suitable for keepaliving */ |
1741 | ||
1742 | int | |
1743 | channel_find_open() | |
1744 | { | |
719fc62f | 1745 | int i; |
1746 | Channel *c; | |
1747 | ||
1748 | for (i = 0; i < channels_alloc; i++) { | |
1749 | c = channels[i]; | |
1750 | if (c == NULL) | |
1751 | continue; | |
1752 | switch (c->type) { | |
3ffc6336 | 1753 | case SSH_CHANNEL_CLOSED: |
3ffc6336 | 1754 | case SSH_CHANNEL_DYNAMIC: |
3ffc6336 | 1755 | case SSH_CHANNEL_X11_LISTENER: |
1756 | case SSH_CHANNEL_PORT_LISTENER: | |
1757 | case SSH_CHANNEL_RPORT_LISTENER: | |
1758 | case SSH_CHANNEL_OPENING: | |
d18e0850 | 1759 | case SSH_CHANNEL_CONNECTING: |
9cf972fa | 1760 | continue; |
1761 | case SSH_CHANNEL_LARVAL: | |
1762 | case SSH_CHANNEL_AUTH_SOCKET: | |
3ffc6336 | 1763 | case SSH_CHANNEL_OPEN: |
1764 | case SSH_CHANNEL_X11_OPEN: | |
1765 | return i; | |
1766 | case SSH_CHANNEL_INPUT_DRAINING: | |
1767 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
1768 | if (!compat13) | |
1769 | fatal("cannot happen: OUT_DRAIN"); | |
1770 | return i; | |
1771 | default: | |
719fc62f | 1772 | fatal("channel_find_open: bad channel type %d", c->type); |
3ffc6336 | 1773 | /* NOTREACHED */ |
1774 | } | |
719fc62f | 1775 | } |
3ffc6336 | 1776 | return -1; |
1777 | } | |
1778 | ||
1779 | ||
aa3378df | 1780 | /* |
1781 | * Returns a message describing the currently open forwarded connections, | |
1782 | * suitable for sending to the client. The message contains crlf pairs for | |
1783 | * newlines. | |
1784 | */ | |
8efc0c15 | 1785 | |
5260325f | 1786 | char * |
1787 | channel_open_message() | |
8efc0c15 | 1788 | { |
5260325f | 1789 | Buffer buffer; |
719fc62f | 1790 | Channel *c; |
1791 | char buf[1024], *cp; | |
5260325f | 1792 | int i; |
5260325f | 1793 | |
1794 | buffer_init(&buffer); | |
1795 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
8efc0c15 | 1796 | buffer_append(&buffer, buf, strlen(buf)); |
5260325f | 1797 | for (i = 0; i < channels_alloc; i++) { |
719fc62f | 1798 | c = channels[i]; |
1799 | if (c == NULL) | |
1800 | continue; | |
5260325f | 1801 | switch (c->type) { |
5260325f | 1802 | case SSH_CHANNEL_X11_LISTENER: |
1803 | case SSH_CHANNEL_PORT_LISTENER: | |
fa08c86b | 1804 | case SSH_CHANNEL_RPORT_LISTENER: |
5260325f | 1805 | case SSH_CHANNEL_CLOSED: |
1806 | case SSH_CHANNEL_AUTH_SOCKET: | |
1807 | continue; | |
7e7327a1 | 1808 | case SSH_CHANNEL_LARVAL: |
5260325f | 1809 | case SSH_CHANNEL_OPENING: |
97fb6912 | 1810 | case SSH_CHANNEL_CONNECTING: |
0490e609 | 1811 | case SSH_CHANNEL_DYNAMIC: |
5260325f | 1812 | case SSH_CHANNEL_OPEN: |
1813 | case SSH_CHANNEL_X11_OPEN: | |
1814 | case SSH_CHANNEL_INPUT_DRAINING: | |
1815 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
7368a6c8 | 1816 | snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n", |
48e671d5 | 1817 | c->self, c->remote_name, |
1818 | c->type, c->remote_id, | |
1819 | c->istate, buffer_len(&c->input), | |
7368a6c8 | 1820 | c->ostate, buffer_len(&c->output), |
1821 | c->rfd, c->wfd); | |
5260325f | 1822 | buffer_append(&buffer, buf, strlen(buf)); |
1823 | continue; | |
1824 | default: | |
7368a6c8 | 1825 | fatal("channel_open_message: bad channel type %d", c->type); |
5260325f | 1826 | /* NOTREACHED */ |
1827 | } | |
1828 | } | |
1829 | buffer_append(&buffer, "\0", 1); | |
1830 | cp = xstrdup(buffer_ptr(&buffer)); | |
1831 | buffer_free(&buffer); | |
1832 | return cp; | |
8efc0c15 | 1833 | } |
1834 | ||
aa3378df | 1835 | /* |
1836 | * Initiate forwarding of connections to local port "port" through the secure | |
1837 | * channel to host:port from remote side. | |
1838 | */ | |
02a024dd | 1839 | int |
fa08c86b | 1840 | channel_request_local_forwarding(u_short listen_port, const char *host_to_connect, |
1841 | u_short port_to_connect, int gateway_ports) | |
1842 | { | |
02a024dd | 1843 | return channel_request_forwarding( |
fa08c86b | 1844 | NULL, listen_port, |
1845 | host_to_connect, port_to_connect, | |
1846 | gateway_ports, /*remote_fwd*/ 0); | |
1847 | } | |
8efc0c15 | 1848 | |
fa08c86b | 1849 | /* |
1850 | * If 'remote_fwd' is true we have a '-R style' listener for protocol 2 | |
1851 | * (SSH_CHANNEL_RPORT_LISTENER). | |
1852 | */ | |
02a024dd | 1853 | int |
fa08c86b | 1854 | channel_request_forwarding( |
1855 | const char *listen_address, u_short listen_port, | |
1856 | const char *host_to_connect, u_short port_to_connect, | |
1857 | int gateway_ports, int remote_fwd) | |
8efc0c15 | 1858 | { |
719fc62f | 1859 | Channel *c; |
1860 | int success, sock, on = 1, ctype; | |
48e671d5 | 1861 | struct addrinfo hints, *ai, *aitop; |
1862 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
fa08c86b | 1863 | const char *host; |
aa3378df | 1864 | struct linger linger; |
5260325f | 1865 | |
02a024dd | 1866 | success = 0; |
1867 | ||
fa08c86b | 1868 | if (remote_fwd) { |
1869 | host = listen_address; | |
2b87da3b | 1870 | ctype = SSH_CHANNEL_RPORT_LISTENER; |
fa08c86b | 1871 | } else { |
1872 | host = host_to_connect; | |
1873 | ctype =SSH_CHANNEL_PORT_LISTENER; | |
1874 | } | |
1875 | ||
719fc62f | 1876 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 1877 | error("Forward host name too long."); |
1878 | return success; | |
1879 | } | |
5260325f | 1880 | |
fa08c86b | 1881 | /* XXX listen_address is currently ignored */ |
aa3378df | 1882 | /* |
48e671d5 | 1883 | * getaddrinfo returns a loopback address if the hostname is |
1884 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 1885 | */ |
48e671d5 | 1886 | memset(&hints, 0, sizeof(hints)); |
1887 | hints.ai_family = IPv4or6; | |
1888 | hints.ai_flags = gateway_ports ? AI_PASSIVE : 0; | |
1889 | hints.ai_socktype = SOCK_STREAM; | |
fa08c86b | 1890 | snprintf(strport, sizeof strport, "%d", listen_port); |
48e671d5 | 1891 | if (getaddrinfo(NULL, strport, &hints, &aitop) != 0) |
1892 | packet_disconnect("getaddrinfo: fatal error"); | |
1893 | ||
48e671d5 | 1894 | for (ai = aitop; ai; ai = ai->ai_next) { |
1895 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
1896 | continue; | |
1897 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
1898 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
fa08c86b | 1899 | error("channel_request_forwarding: getnameinfo failed"); |
48e671d5 | 1900 | continue; |
1901 | } | |
1902 | /* Create a port to listen for the host. */ | |
1903 | sock = socket(ai->ai_family, SOCK_STREAM, 0); | |
1904 | if (sock < 0) { | |
1905 | /* this is no error since kernel may not support ipv6 */ | |
1906 | verbose("socket: %.100s", strerror(errno)); | |
1907 | continue; | |
1908 | } | |
1909 | /* | |
1910 | * Set socket options. We would like the socket to disappear | |
1911 | * as soon as it has been closed for whatever reason. | |
1912 | */ | |
1913 | setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); | |
1914 | linger.l_onoff = 1; | |
1915 | linger.l_linger = 5; | |
1916 | setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger)); | |
1917 | debug("Local forwarding listening on %s port %s.", ntop, strport); | |
1918 | ||
1919 | /* Bind the socket to the address. */ | |
1920 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
1921 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 1922 | if (!ai->ai_next) |
1923 | error("bind: %.100s", strerror(errno)); | |
1924 | else | |
1925 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 1926 | |
48e671d5 | 1927 | close(sock); |
1928 | continue; | |
1929 | } | |
1930 | /* Start listening for connections on the socket. */ | |
1931 | if (listen(sock, 5) < 0) { | |
1932 | error("listen: %.100s", strerror(errno)); | |
1933 | close(sock); | |
1934 | continue; | |
1935 | } | |
1936 | /* Allocate a channel number for the socket. */ | |
719fc62f | 1937 | c = channel_new("port listener", ctype, sock, sock, -1, |
0b242b12 | 1938 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
a22aff1f | 1939 | 0, xstrdup("port listener"), 1); |
719fc62f | 1940 | if (c == NULL) { |
1941 | error("channel_request_forwarding: channel_new failed"); | |
1942 | close(sock); | |
1943 | continue; | |
1944 | } | |
1945 | strlcpy(c->path, host, sizeof(c->path)); | |
1946 | c->host_port = port_to_connect; | |
1947 | c->listening_port = listen_port; | |
48e671d5 | 1948 | success = 1; |
1949 | } | |
1950 | if (success == 0) | |
02a024dd | 1951 | error("channel_request_forwarding: cannot listen to port: %d", |
1952 | listen_port); | |
48e671d5 | 1953 | freeaddrinfo(aitop); |
02a024dd | 1954 | return success; |
5260325f | 1955 | } |
8efc0c15 | 1956 | |
aa3378df | 1957 | /* |
1958 | * Initiate forwarding of connections to port "port" on remote host through | |
1959 | * the secure channel to host:port from local side. | |
1960 | */ | |
8efc0c15 | 1961 | |
6ae2364d | 1962 | void |
fa08c86b | 1963 | channel_request_remote_forwarding(u_short listen_port, |
1964 | const char *host_to_connect, u_short port_to_connect) | |
8efc0c15 | 1965 | { |
fa08c86b | 1966 | int payload_len, type, success = 0; |
1967 | ||
5260325f | 1968 | /* Record locally that connection to this host/port is permitted. */ |
1969 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
1970 | fatal("channel_request_remote_forwarding: too many forwards"); | |
1971 | ||
5260325f | 1972 | /* Send the forward request to the remote side. */ |
7e7327a1 | 1973 | if (compat20) { |
1974 | const char *address_to_bind = "0.0.0.0"; | |
1975 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
1976 | packet_put_cstring("tcpip-forward"); | |
1977 | packet_put_char(0); /* boolean: want reply */ | |
1978 | packet_put_cstring(address_to_bind); | |
1979 | packet_put_int(listen_port); | |
fa08c86b | 1980 | packet_send(); |
1981 | packet_write_wait(); | |
1982 | /* Assume that server accepts the request */ | |
1983 | success = 1; | |
7e7327a1 | 1984 | } else { |
1985 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 1986 | packet_put_int(listen_port); |
d6f24e45 | 1987 | packet_put_cstring(host_to_connect); |
1988 | packet_put_int(port_to_connect); | |
7e7327a1 | 1989 | packet_send(); |
1990 | packet_write_wait(); | |
fa08c86b | 1991 | |
1992 | /* Wait for response from the remote side. */ | |
1993 | type = packet_read(&payload_len); | |
1994 | switch (type) { | |
1995 | case SSH_SMSG_SUCCESS: | |
1996 | success = 1; | |
1997 | break; | |
1998 | case SSH_SMSG_FAILURE: | |
1999 | log("Warning: Server denied remote port forwarding."); | |
2000 | break; | |
2001 | default: | |
2002 | /* Unknown packet */ | |
2003 | packet_disconnect("Protocol error for port forward request:" | |
2004 | "received packet type %d.", type); | |
2005 | } | |
2006 | } | |
2007 | if (success) { | |
2008 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2009 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2010 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2011 | num_permitted_opens++; | |
7e7327a1 | 2012 | } |
8efc0c15 | 2013 | } |
2014 | ||
aa3378df | 2015 | /* |
2016 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2017 | * listening for the port, and sends back a success reply (or disconnect | |
2018 | * message if there was an error). This never returns if there was an error. | |
2019 | */ | |
8efc0c15 | 2020 | |
6ae2364d | 2021 | void |
1d1ffb87 | 2022 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2023 | { |
57112b5a | 2024 | u_short port, host_port; |
5260325f | 2025 | char *hostname; |
2026 | ||
2027 | /* Get arguments from the packet. */ | |
2028 | port = packet_get_int(); | |
2029 | hostname = packet_get_string(NULL); | |
2030 | host_port = packet_get_int(); | |
2031 | ||
3c62e7eb | 2032 | #ifndef HAVE_CYGWIN |
aa3378df | 2033 | /* |
2034 | * Check that an unprivileged user is not trying to forward a | |
2035 | * privileged port. | |
2036 | */ | |
5260325f | 2037 | if (port < IPPORT_RESERVED && !is_root) |
2038 | packet_disconnect("Requested forwarding of port %d but user is not root.", | |
2039 | port); | |
3c62e7eb | 2040 | #endif |
fa08c86b | 2041 | /* Initiate forwarding */ |
1d1ffb87 | 2042 | channel_request_local_forwarding(port, hostname, host_port, gateway_ports); |
5260325f | 2043 | |
2044 | /* Free the argument string. */ | |
2045 | xfree(hostname); | |
8efc0c15 | 2046 | } |
2047 | ||
01794848 | 2048 | /* |
2049 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2050 | * usually called by the server, because the user could connect to any port | |
2051 | * anyway, and the server has no way to know but to trust the client anyway. | |
2052 | */ | |
2053 | void | |
2054 | channel_permit_all_opens() | |
2055 | { | |
2056 | if (num_permitted_opens == 0) | |
2057 | all_opens_permitted = 1; | |
2058 | } | |
2059 | ||
cd332296 | 2060 | void |
01794848 | 2061 | channel_add_permitted_opens(char *host, int port) |
2062 | { | |
2063 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2064 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2065 | debug("allow port forwarding to host %s port %d", host, port); | |
2066 | ||
2067 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2068 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2069 | num_permitted_opens++; | |
2070 | ||
2071 | all_opens_permitted = 0; | |
2072 | } | |
2073 | ||
cd332296 | 2074 | void |
01794848 | 2075 | channel_clear_permitted_opens(void) |
2076 | { | |
2077 | int i; | |
2078 | ||
2079 | for (i = 0; i < num_permitted_opens; i++) | |
2080 | xfree(permitted_opens[i].host_to_connect); | |
2081 | num_permitted_opens = 0; | |
2082 | ||
2083 | } | |
2084 | ||
2085 | ||
2086 | /* return socket to remote host, port */ | |
7368a6c8 | 2087 | int |
01794848 | 2088 | connect_to(const char *host, u_short port) |
8efc0c15 | 2089 | { |
48e671d5 | 2090 | struct addrinfo hints, *ai, *aitop; |
2091 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
2092 | int gaierr; | |
7368a6c8 | 2093 | int sock = -1; |
48e671d5 | 2094 | |
2095 | memset(&hints, 0, sizeof(hints)); | |
2096 | hints.ai_family = IPv4or6; | |
2097 | hints.ai_socktype = SOCK_STREAM; | |
01794848 | 2098 | snprintf(strport, sizeof strport, "%d", port); |
48e671d5 | 2099 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
01794848 | 2100 | error("connect_to %.100s: unknown host (%s)", host, |
2101 | gai_strerror(gaierr)); | |
7368a6c8 | 2102 | return -1; |
48e671d5 | 2103 | } |
48e671d5 | 2104 | for (ai = aitop; ai; ai = ai->ai_next) { |
2105 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2106 | continue; | |
2107 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2108 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
01794848 | 2109 | error("connect_to: getnameinfo failed"); |
48e671d5 | 2110 | continue; |
5260325f | 2111 | } |
48e671d5 | 2112 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
2113 | if (sock < 0) { | |
2114 | error("socket: %.100s", strerror(errno)); | |
2115 | continue; | |
5260325f | 2116 | } |
eea39c02 | 2117 | if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0) |
97fb6912 | 2118 | fatal("connect_to: F_SETFL: %s", strerror(errno)); |
97fb6912 | 2119 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
2120 | errno != EINPROGRESS) { | |
01794848 | 2121 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
48e671d5 | 2122 | strerror(errno)); |
2123 | close(sock); | |
2b87da3b | 2124 | continue; /* fail -- try next */ |
48e671d5 | 2125 | } |
2126 | break; /* success */ | |
5260325f | 2127 | |
5260325f | 2128 | } |
48e671d5 | 2129 | freeaddrinfo(aitop); |
48e671d5 | 2130 | if (!ai) { |
01794848 | 2131 | error("connect_to %.100s port %d: failed.", host, port); |
7368a6c8 | 2132 | return -1; |
8efc0c15 | 2133 | } |
7368a6c8 | 2134 | /* success */ |
2135 | return sock; | |
2136 | } | |
01794848 | 2137 | |
fa08c86b | 2138 | int |
2139 | channel_connect_by_listen_adress(u_short listen_port) | |
2140 | { | |
2141 | int i; | |
01794848 | 2142 | |
fa08c86b | 2143 | for (i = 0; i < num_permitted_opens; i++) |
2144 | if (permitted_opens[i].listen_port == listen_port) | |
01794848 | 2145 | return connect_to( |
fa08c86b | 2146 | permitted_opens[i].host_to_connect, |
2147 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 2148 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2149 | listen_port); | |
fa08c86b | 2150 | return -1; |
2151 | } | |
48e671d5 | 2152 | |
01794848 | 2153 | /* Check if connecting to that port is permitted and connect. */ |
2154 | int | |
2155 | channel_connect_to(const char *host, u_short port) | |
2156 | { | |
2157 | int i, permit; | |
2158 | ||
2159 | permit = all_opens_permitted; | |
2160 | if (!permit) { | |
2161 | for (i = 0; i < num_permitted_opens; i++) | |
2162 | if (permitted_opens[i].port_to_connect == port && | |
2163 | strcmp(permitted_opens[i].host_to_connect, host) == 0) | |
2164 | permit = 1; | |
2165 | ||
2166 | } | |
2167 | if (!permit) { | |
2168 | log("Received request to connect to host %.100s port %d, " | |
2169 | "but the request was denied.", host, port); | |
2170 | return -1; | |
2171 | } | |
2172 | return connect_to(host, port); | |
2173 | } | |
2174 | ||
7368a6c8 | 2175 | /* |
2176 | * This is called after receiving PORT_OPEN message. This attempts to | |
2177 | * connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION | |
2178 | * or CHANNEL_OPEN_FAILURE. | |
2179 | */ | |
5260325f | 2180 | |
6ae2364d | 2181 | void |
188adeb2 | 2182 | channel_input_port_open(int type, int plen, void *ctxt) |
7368a6c8 | 2183 | { |
719fc62f | 2184 | Channel *c = NULL; |
7368a6c8 | 2185 | u_short host_port; |
2186 | char *host, *originator_string; | |
719fc62f | 2187 | int remote_id, sock = -1; |
5260325f | 2188 | |
719fc62f | 2189 | remote_id = packet_get_int(); |
01794848 | 2190 | host = packet_get_string(NULL); |
7368a6c8 | 2191 | host_port = packet_get_int(); |
5260325f | 2192 | |
7368a6c8 | 2193 | if (have_hostname_in_open) { |
01794848 | 2194 | originator_string = packet_get_string(NULL); |
7368a6c8 | 2195 | } else { |
2196 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
7368a6c8 | 2197 | } |
01794848 | 2198 | packet_done(); |
2199 | sock = channel_connect_to(host, host_port); | |
2200 | if (sock != -1) { | |
719fc62f | 2201 | c = channel_new("connected socket", |
2202 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, | |
2203 | originator_string, 1); | |
2204 | if (c == NULL) { | |
2205 | error("channel_input_port_open: channel_new failed"); | |
2206 | close(sock); | |
2207 | } else { | |
2208 | c->remote_id = remote_id; | |
2209 | } | |
2210 | } | |
2211 | if (c == NULL) { | |
2212 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2213 | packet_put_int(remote_id); | |
d18e0850 | 2214 | packet_send(); |
7368a6c8 | 2215 | } |
2216 | xfree(host); | |
8efc0c15 | 2217 | } |
2218 | ||
aa3378df | 2219 | /* |
2220 | * Creates an internet domain socket for listening for X11 connections. | |
2221 | * Returns a suitable value for the DISPLAY variable, or NULL if an error | |
2222 | * occurs. | |
2223 | */ | |
8efc0c15 | 2224 | |
48e671d5 | 2225 | #define NUM_SOCKS 10 |
2226 | ||
5260325f | 2227 | char * |
95f1eccc | 2228 | x11_create_display_inet(int screen_number, int x11_display_offset) |
8efc0c15 | 2229 | { |
57112b5a | 2230 | int display_number, sock; |
2231 | u_short port; | |
48e671d5 | 2232 | struct addrinfo hints, *ai, *aitop; |
2233 | char strport[NI_MAXSERV]; | |
2234 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
2235 | char display[512]; | |
5260325f | 2236 | char hostname[MAXHOSTNAMELEN]; |
2237 | ||
95f1eccc | 2238 | for (display_number = x11_display_offset; |
5260325f | 2239 | display_number < MAX_DISPLAYS; |
2240 | display_number++) { | |
2241 | port = 6000 + display_number; | |
48e671d5 | 2242 | memset(&hints, 0, sizeof(hints)); |
2243 | hints.ai_family = IPv4or6; | |
2244 | hints.ai_flags = AI_PASSIVE; /* XXX loopback only ? */ | |
2245 | hints.ai_socktype = SOCK_STREAM; | |
2246 | snprintf(strport, sizeof strport, "%d", port); | |
2247 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
2248 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); | |
5260325f | 2249 | return NULL; |
2250 | } | |
48e671d5 | 2251 | for (ai = aitop; ai; ai = ai->ai_next) { |
2252 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2253 | continue; | |
2254 | sock = socket(ai->ai_family, SOCK_STREAM, 0); | |
2255 | if (sock < 0) { | |
4ee81249 | 2256 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 2257 | error("socket: %.100s", strerror(errno)); |
2258 | return NULL; | |
2259 | } else { | |
22d89d24 | 2260 | debug("x11_create_display_inet: Socket family %d not supported", |
2261 | ai->ai_family); | |
80a44451 | 2262 | continue; |
2263 | } | |
48e671d5 | 2264 | } |
2265 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2266 | debug("bind port %d: %.100s", port, strerror(errno)); | |
2267 | shutdown(sock, SHUT_RDWR); | |
2268 | close(sock); | |
16218745 | 2269 | |
2270 | if (ai->ai_next) | |
2271 | continue; | |
2272 | ||
48e671d5 | 2273 | for (n = 0; n < num_socks; n++) { |
2274 | shutdown(socks[n], SHUT_RDWR); | |
2275 | close(socks[n]); | |
2276 | } | |
2277 | num_socks = 0; | |
2278 | break; | |
2279 | } | |
2280 | socks[num_socks++] = sock; | |
80faa19f | 2281 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 2282 | if (num_socks == NUM_SOCKS) |
2283 | break; | |
80faa19f | 2284 | #else |
2285 | break; | |
2286 | #endif | |
5260325f | 2287 | } |
4ccb01d6 | 2288 | freeaddrinfo(aitop); |
48e671d5 | 2289 | if (num_socks > 0) |
2290 | break; | |
5260325f | 2291 | } |
2292 | if (display_number >= MAX_DISPLAYS) { | |
2293 | error("Failed to allocate internet-domain X11 display socket."); | |
2294 | return NULL; | |
8efc0c15 | 2295 | } |
5260325f | 2296 | /* Start listening for connections on the socket. */ |
48e671d5 | 2297 | for (n = 0; n < num_socks; n++) { |
2298 | sock = socks[n]; | |
2299 | if (listen(sock, 5) < 0) { | |
2300 | error("listen: %.100s", strerror(errno)); | |
2301 | shutdown(sock, SHUT_RDWR); | |
2302 | close(sock); | |
2303 | return NULL; | |
2304 | } | |
8efc0c15 | 2305 | } |
48e671d5 | 2306 | |
5260325f | 2307 | /* Set up a suitable value for the DISPLAY variable. */ |
2308 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2309 | fatal("gethostname: %.100s", strerror(errno)); | |
a7effaac | 2310 | |
2311 | #ifdef IPADDR_IN_DISPLAY | |
2b87da3b | 2312 | /* |
a7effaac | 2313 | * HPUX detects the local hostname in the DISPLAY variable and tries |
2314 | * to set up a shared memory connection to the server, which it | |
2315 | * incorrectly supposes to be local. | |
2316 | * | |
2317 | * The workaround - as used in later $$H and other programs - is | |
2318 | * is to set display to the host's IP address. | |
2319 | */ | |
2320 | { | |
2321 | struct hostent *he; | |
2322 | struct in_addr my_addr; | |
2323 | ||
2324 | he = gethostbyname(hostname); | |
2325 | if (he == NULL) { | |
2326 | error("[X11-broken-fwd-hostname-workaround] Could not get " | |
2327 | "IP address for hostname %s.", hostname); | |
2328 | ||
2329 | packet_send_debug("[X11-broken-fwd-hostname-workaround]" | |
2330 | "Could not get IP address for hostname %s.", hostname); | |
2331 | ||
2332 | shutdown(sock, SHUT_RDWR); | |
2333 | close(sock); | |
2334 | ||
2335 | return NULL; | |
2336 | } | |
2337 | ||
2338 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
2339 | ||
2340 | /* Set DISPLAY to <ip address>:screen.display */ | |
2b87da3b | 2341 | snprintf(display, sizeof(display), "%.50s:%d.%d", inet_ntoa(my_addr), |
74141647 | 2342 | display_number, screen_number); |
a7effaac | 2343 | } |
2344 | #else /* IPADDR_IN_DISPLAY */ | |
2345 | /* Just set DISPLAY to hostname:screen.display */ | |
48e671d5 | 2346 | snprintf(display, sizeof display, "%.400s:%d.%d", hostname, |
74141647 | 2347 | display_number, screen_number); |
a7effaac | 2348 | #endif /* IPADDR_IN_DISPLAY */ |
5260325f | 2349 | |
48e671d5 | 2350 | /* Allocate a channel for each socket. */ |
2351 | for (n = 0; n < num_socks; n++) { | |
2352 | sock = socks[n]; | |
0b242b12 | 2353 | (void) channel_new("x11 listener", |
2354 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, | |
2355 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
a22aff1f | 2356 | 0, xstrdup("X11 inet listener"), 1); |
48e671d5 | 2357 | } |
5260325f | 2358 | |
2359 | /* Return a suitable value for the DISPLAY environment variable. */ | |
48e671d5 | 2360 | return xstrdup(display); |
8efc0c15 | 2361 | } |
2362 | ||
2363 | #ifndef X_UNIX_PATH | |
2364 | #define X_UNIX_PATH "/tmp/.X11-unix/X" | |
2365 | #endif | |
2366 | ||
2367 | static | |
2368 | int | |
1e3b8b07 | 2369 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 2370 | { |
5260325f | 2371 | static const char *const x_sockets[] = { |
2372 | X_UNIX_PATH "%u", | |
2373 | "/var/X/.X11-unix/X" "%u", | |
2374 | "/usr/spool/sockets/X11/" "%u", | |
2375 | NULL | |
2376 | }; | |
2377 | int sock; | |
2378 | struct sockaddr_un addr; | |
2379 | const char *const * path; | |
2380 | ||
2381 | for (path = x_sockets; *path; ++path) { | |
2382 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
2383 | if (sock < 0) | |
2384 | error("socket: %.100s", strerror(errno)); | |
2385 | memset(&addr, 0, sizeof(addr)); | |
2386 | addr.sun_family = AF_UNIX; | |
2387 | snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr); | |
2388 | if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0) | |
2389 | return sock; | |
2390 | close(sock); | |
2391 | } | |
2392 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); | |
2393 | return -1; | |
8efc0c15 | 2394 | } |
2395 | ||
0b242b12 | 2396 | int |
2397 | x11_connect_display(void) | |
8efc0c15 | 2398 | { |
0b242b12 | 2399 | int display_number, sock = 0; |
5260325f | 2400 | const char *display; |
0b242b12 | 2401 | char buf[1024], *cp; |
48e671d5 | 2402 | struct addrinfo hints, *ai, *aitop; |
2403 | char strport[NI_MAXSERV]; | |
2404 | int gaierr; | |
5260325f | 2405 | |
5260325f | 2406 | /* Try to open a socket for the local X server. */ |
2407 | display = getenv("DISPLAY"); | |
2408 | if (!display) { | |
2409 | error("DISPLAY not set."); | |
0b242b12 | 2410 | return -1; |
5260325f | 2411 | } |
aa3378df | 2412 | /* |
2413 | * Now we decode the value of the DISPLAY variable and make a | |
2414 | * connection to the real X server. | |
2415 | */ | |
2416 | ||
2417 | /* | |
2418 | * Check if it is a unix domain socket. Unix domain displays are in | |
2419 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
2420 | */ | |
5260325f | 2421 | if (strncmp(display, "unix:", 5) == 0 || |
2422 | display[0] == ':') { | |
2423 | /* Connect to the unix domain socket. */ | |
2424 | if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) { | |
2425 | error("Could not parse display number from DISPLAY: %.100s", | |
2426 | display); | |
0b242b12 | 2427 | return -1; |
5260325f | 2428 | } |
2429 | /* Create a socket. */ | |
2430 | sock = connect_local_xsocket(display_number); | |
2431 | if (sock < 0) | |
0b242b12 | 2432 | return -1; |
5260325f | 2433 | |
2434 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 2435 | return sock; |
5260325f | 2436 | } |
aa3378df | 2437 | /* |
2438 | * Connect to an inet socket. The DISPLAY value is supposedly | |
2439 | * hostname:d[.s], where hostname may also be numeric IP address. | |
2440 | */ | |
5260325f | 2441 | strncpy(buf, display, sizeof(buf)); |
2442 | buf[sizeof(buf) - 1] = 0; | |
2443 | cp = strchr(buf, ':'); | |
2444 | if (!cp) { | |
2445 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 2446 | return -1; |
5260325f | 2447 | } |
2448 | *cp = 0; | |
aa3378df | 2449 | /* buf now contains the host name. But first we parse the display number. */ |
5260325f | 2450 | if (sscanf(cp + 1, "%d", &display_number) != 1) { |
2451 | error("Could not parse display number from DISPLAY: %.100s", | |
2452 | display); | |
0b242b12 | 2453 | return -1; |
5260325f | 2454 | } |
5260325f | 2455 | |
48e671d5 | 2456 | /* Look up the host address */ |
2457 | memset(&hints, 0, sizeof(hints)); | |
2458 | hints.ai_family = IPv4or6; | |
2459 | hints.ai_socktype = SOCK_STREAM; | |
2460 | snprintf(strport, sizeof strport, "%d", 6000 + display_number); | |
2461 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { | |
2462 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); | |
0b242b12 | 2463 | return -1; |
8efc0c15 | 2464 | } |
48e671d5 | 2465 | for (ai = aitop; ai; ai = ai->ai_next) { |
2466 | /* Create a socket. */ | |
2467 | sock = socket(ai->ai_family, SOCK_STREAM, 0); | |
2468 | if (sock < 0) { | |
2469 | debug("socket: %.100s", strerror(errno)); | |
7368a6c8 | 2470 | continue; |
2471 | } | |
2472 | /* Connect it to the display. */ | |
2473 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2474 | debug("connect %.100s port %d: %.100s", buf, | |
2475 | 6000 + display_number, strerror(errno)); | |
2476 | close(sock); | |
2477 | continue; | |
2478 | } | |
2479 | /* Success */ | |
2480 | break; | |
48e671d5 | 2481 | } |
48e671d5 | 2482 | freeaddrinfo(aitop); |
2483 | if (!ai) { | |
6ae2364d | 2484 | error("connect %.100s port %d: %.100s", buf, 6000 + display_number, |
48e671d5 | 2485 | strerror(errno)); |
0b242b12 | 2486 | return -1; |
8efc0c15 | 2487 | } |
0b242b12 | 2488 | return sock; |
2489 | } | |
5260325f | 2490 | |
0b242b12 | 2491 | /* |
2492 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
2493 | * the remote channel number. We should do whatever we want, and respond | |
2494 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
2495 | */ | |
5260325f | 2496 | |
0b242b12 | 2497 | void |
188adeb2 | 2498 | x11_input_open(int type, int plen, void *ctxt) |
0b242b12 | 2499 | { |
719fc62f | 2500 | Channel *c = NULL; |
2501 | int remote_id, sock = 0; | |
0b242b12 | 2502 | char *remote_host; |
5260325f | 2503 | |
719fc62f | 2504 | debug("Received X11 open request."); |
5260325f | 2505 | |
719fc62f | 2506 | remote_id = packet_get_int(); |
0b242b12 | 2507 | if (have_hostname_in_open) { |
719fc62f | 2508 | remote_host = packet_get_string(NULL); |
0b242b12 | 2509 | } else { |
2510 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 2511 | } |
719fc62f | 2512 | packet_done(); |
0b242b12 | 2513 | |
2514 | /* Obtain a connection to the real X display. */ | |
2515 | sock = x11_connect_display(); | |
719fc62f | 2516 | if (sock != -1) { |
2517 | /* Allocate a channel for this connection. */ | |
2518 | c = channel_new("connected x11 socket", | |
2519 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
2520 | remote_host, 1); | |
2521 | if (c == NULL) { | |
2522 | error("x11_input_open: channel_new failed"); | |
2523 | close(sock); | |
2524 | } else { | |
2525 | c->remote_id = remote_id; | |
2526 | } | |
2527 | } | |
2528 | if (c == NULL) { | |
0b242b12 | 2529 | /* Send refusal to the remote host. */ |
2530 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 2531 | packet_put_int(remote_id); |
0b242b12 | 2532 | } else { |
0b242b12 | 2533 | /* Send a confirmation to the remote host. */ |
2534 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 2535 | packet_put_int(remote_id); |
2536 | packet_put_int(c->self); | |
0b242b12 | 2537 | } |
719fc62f | 2538 | packet_send(); |
8efc0c15 | 2539 | } |
2540 | ||
a22aff1f | 2541 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
2542 | void | |
2543 | deny_input_open(int type, int plen, void *ctxt) | |
2544 | { | |
2545 | int rchan = packet_get_int(); | |
2546 | switch(type){ | |
2547 | case SSH_SMSG_AGENT_OPEN: | |
2548 | error("Warning: ssh server tried agent forwarding."); | |
2549 | break; | |
2550 | case SSH_SMSG_X11_OPEN: | |
2551 | error("Warning: ssh server tried X11 forwarding."); | |
2552 | break; | |
2553 | default: | |
2554 | error("deny_input_open: type %d plen %d", type, plen); | |
2555 | break; | |
2556 | } | |
2557 | error("Warning: this is probably a break in attempt by a malicious server."); | |
2558 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2559 | packet_put_int(rchan); | |
2560 | packet_send(); | |
2561 | } | |
2562 | ||
aa3378df | 2563 | /* |
2564 | * Requests forwarding of X11 connections, generates fake authentication | |
2565 | * data, and enables authentication spoofing. | |
2566 | */ | |
8efc0c15 | 2567 | |
6ae2364d | 2568 | void |
0b242b12 | 2569 | x11_request_forwarding_with_spoofing(int client_session_id, |
2570 | const char *proto, const char *data) | |
8efc0c15 | 2571 | { |
1e3b8b07 | 2572 | u_int data_len = (u_int) strlen(data) / 2; |
ca910e13 | 2573 | u_int i, value, len; |
5260325f | 2574 | char *new_data; |
2575 | int screen_number; | |
2576 | const char *cp; | |
2577 | u_int32_t rand = 0; | |
2578 | ||
2579 | cp = getenv("DISPLAY"); | |
2580 | if (cp) | |
2581 | cp = strchr(cp, ':'); | |
2582 | if (cp) | |
2583 | cp = strchr(cp, '.'); | |
2584 | if (cp) | |
2585 | screen_number = atoi(cp + 1); | |
2586 | else | |
2587 | screen_number = 0; | |
2588 | ||
2589 | /* Save protocol name. */ | |
2590 | x11_saved_proto = xstrdup(proto); | |
2591 | ||
aa3378df | 2592 | /* |
2593 | * Extract real authentication data and generate fake data of the | |
2594 | * same length. | |
2595 | */ | |
5260325f | 2596 | x11_saved_data = xmalloc(data_len); |
2597 | x11_fake_data = xmalloc(data_len); | |
2598 | for (i = 0; i < data_len; i++) { | |
2599 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
2600 | fatal("x11_request_forwarding: bad authentication data: %.100s", data); | |
2601 | if (i % 4 == 0) | |
2602 | rand = arc4random(); | |
2603 | x11_saved_data[i] = value; | |
2604 | x11_fake_data[i] = rand & 0xff; | |
2605 | rand >>= 8; | |
2606 | } | |
2607 | x11_saved_data_len = data_len; | |
2608 | x11_fake_data_len = data_len; | |
2609 | ||
2610 | /* Convert the fake data into hex. */ | |
ca910e13 | 2611 | len = 2 * data_len + 1; |
2612 | new_data = xmalloc(len); | |
5260325f | 2613 | for (i = 0; i < data_len; i++) |
ca910e13 | 2614 | snprintf(new_data + 2 * i, len - 2 * i, |
2615 | "%02x", (u_char) x11_fake_data[i]); | |
5260325f | 2616 | |
2617 | /* Send the request packet. */ | |
0b242b12 | 2618 | if (compat20) { |
2619 | channel_request_start(client_session_id, "x11-req", 0); | |
2620 | packet_put_char(0); /* XXX bool single connection */ | |
2621 | } else { | |
2622 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
2623 | } | |
2624 | packet_put_cstring(proto); | |
2625 | packet_put_cstring(new_data); | |
5260325f | 2626 | packet_put_int(screen_number); |
2627 | packet_send(); | |
2628 | packet_write_wait(); | |
2629 | xfree(new_data); | |
8efc0c15 | 2630 | } |
2631 | ||
2632 | /* Sends a message to the server to request authentication fd forwarding. */ | |
2633 | ||
6ae2364d | 2634 | void |
5260325f | 2635 | auth_request_forwarding() |
8efc0c15 | 2636 | { |
5260325f | 2637 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
2638 | packet_send(); | |
2639 | packet_write_wait(); | |
8efc0c15 | 2640 | } |
2641 | ||
aa3378df | 2642 | /* |
2643 | * Returns the name of the forwarded authentication socket. Returns NULL if | |
2644 | * there is no forwarded authentication socket. The returned value points to | |
2645 | * a static buffer. | |
2646 | */ | |
8efc0c15 | 2647 | |
5260325f | 2648 | char * |
2649 | auth_get_socket_name() | |
8efc0c15 | 2650 | { |
5260325f | 2651 | return channel_forwarded_auth_socket_name; |
8efc0c15 | 2652 | } |
2653 | ||
2654 | /* removes the agent forwarding socket */ | |
2655 | ||
6ae2364d | 2656 | void |
5260325f | 2657 | cleanup_socket(void) |
2658 | { | |
77bb0bca | 2659 | unlink(channel_forwarded_auth_socket_name); |
5260325f | 2660 | rmdir(channel_forwarded_auth_socket_dir); |
8efc0c15 | 2661 | } |
2662 | ||
aa3378df | 2663 | /* |
fa649821 | 2664 | * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. |
aa3378df | 2665 | * This starts forwarding authentication requests. |
2666 | */ | |
8efc0c15 | 2667 | |
fa649821 | 2668 | int |
5260325f | 2669 | auth_input_request_forwarding(struct passwd * pw) |
8efc0c15 | 2670 | { |
719fc62f | 2671 | Channel *nc; |
2672 | int sock; | |
5260325f | 2673 | struct sockaddr_un sunaddr; |
2674 | ||
2675 | if (auth_get_socket_name() != NULL) | |
2676 | fatal("Protocol error: authentication forwarding requested twice."); | |
2677 | ||
2678 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
63bd8c36 | 2679 | temporarily_use_uid(pw); |
5260325f | 2680 | |
2681 | /* Allocate a buffer for the socket name, and format the name. */ | |
2682 | channel_forwarded_auth_socket_name = xmalloc(MAX_SOCKET_NAME); | |
2683 | channel_forwarded_auth_socket_dir = xmalloc(MAX_SOCKET_NAME); | |
2684 | strlcpy(channel_forwarded_auth_socket_dir, "/tmp/ssh-XXXXXXXX", MAX_SOCKET_NAME); | |
2685 | ||
2686 | /* Create private directory for socket */ | |
fa649821 | 2687 | if (mkdtemp(channel_forwarded_auth_socket_dir) == NULL) { |
2688 | packet_send_debug("Agent forwarding disabled: mkdtemp() failed: %.100s", | |
2689 | strerror(errno)); | |
2690 | restore_uid(); | |
2691 | xfree(channel_forwarded_auth_socket_name); | |
2692 | xfree(channel_forwarded_auth_socket_dir); | |
2693 | channel_forwarded_auth_socket_name = NULL; | |
2694 | channel_forwarded_auth_socket_dir = NULL; | |
2695 | return 0; | |
2696 | } | |
5260325f | 2697 | snprintf(channel_forwarded_auth_socket_name, MAX_SOCKET_NAME, "%s/agent.%d", |
2698 | channel_forwarded_auth_socket_dir, (int) getpid()); | |
2699 | ||
2700 | if (atexit(cleanup_socket) < 0) { | |
2701 | int saved = errno; | |
2702 | cleanup_socket(); | |
2703 | packet_disconnect("socket: %.100s", strerror(saved)); | |
2704 | } | |
2705 | /* Create the socket. */ | |
2706 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
2707 | if (sock < 0) | |
2708 | packet_disconnect("socket: %.100s", strerror(errno)); | |
2709 | ||
2710 | /* Bind it to the name. */ | |
2711 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
2712 | sunaddr.sun_family = AF_UNIX; | |
2713 | strncpy(sunaddr.sun_path, channel_forwarded_auth_socket_name, | |
2714 | sizeof(sunaddr.sun_path)); | |
2715 | ||
2716 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
2717 | packet_disconnect("bind: %.100s", strerror(errno)); | |
2718 | ||
2719 | /* Restore the privileged uid. */ | |
2720 | restore_uid(); | |
2721 | ||
2722 | /* Start listening on the socket. */ | |
2723 | if (listen(sock, 5) < 0) | |
2724 | packet_disconnect("listen: %.100s", strerror(errno)); | |
2725 | ||
2726 | /* Allocate a channel for the authentication agent socket. */ | |
719fc62f | 2727 | nc = channel_new("auth socket", |
fa08c86b | 2728 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, |
2729 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
2730 | 0, xstrdup("auth socket"), 1); | |
719fc62f | 2731 | if (nc == NULL) { |
2732 | error("auth_input_request_forwarding: channel_new failed"); | |
2733 | close(sock); | |
2734 | return 0; | |
2735 | } | |
2736 | strlcpy(nc->path, channel_forwarded_auth_socket_name, sizeof(nc->path)); | |
fa649821 | 2737 | return 1; |
8efc0c15 | 2738 | } |
2739 | ||
2740 | /* This is called to process an SSH_SMSG_AGENT_OPEN message. */ | |
2741 | ||
6ae2364d | 2742 | void |
188adeb2 | 2743 | auth_input_open_request(int type, int plen, void *ctxt) |
8efc0c15 | 2744 | { |
719fc62f | 2745 | Channel *c = NULL; |
2746 | int remote_id, sock; | |
5260325f | 2747 | char *dummyname; |
2748 | ||
7368a6c8 | 2749 | packet_integrity_check(plen, 4, type); |
2750 | ||
5260325f | 2751 | /* Read the remote channel number from the message. */ |
719fc62f | 2752 | remote_id = packet_get_int(); |
5260325f | 2753 | |
aa3378df | 2754 | /* |
2755 | * Get a connection to the local authentication agent (this may again | |
2756 | * get forwarded). | |
2757 | */ | |
5260325f | 2758 | sock = ssh_get_authentication_socket(); |
2759 | ||
aa3378df | 2760 | /* |
2761 | * If we could not connect the agent, send an error message back to | |
2762 | * the server. This should never happen unless the agent dies, | |
2763 | * because authentication forwarding is only enabled if we have an | |
2764 | * agent. | |
2765 | */ | |
719fc62f | 2766 | if (sock >= 0) { |
2767 | dummyname = xstrdup("authentication agent connection"); | |
2768 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, -1, 0, 0, 0, dummyname, 1); | |
2769 | if (c == NULL) { | |
2770 | error("auth_input_open_request: channel_new failed"); | |
2771 | close(sock); | |
2772 | } else { | |
2773 | c->remote_id = remote_id; | |
2774 | } | |
2775 | } | |
2776 | if (c == NULL) { | |
5260325f | 2777 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
719fc62f | 2778 | packet_put_int(remote_id); |
2779 | } else { | |
2780 | /* Send a confirmation to the remote host. */ | |
2781 | debug("Forwarding authentication connection."); | |
2782 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
2783 | packet_put_int(remote_id); | |
2784 | packet_put_int(c->self); | |
5260325f | 2785 | } |
5260325f | 2786 | packet_send(); |
8efc0c15 | 2787 | } |
7e7327a1 | 2788 | |
2789 | void | |
0b242b12 | 2790 | channel_start_open(int id) |
7e7327a1 | 2791 | { |
2792 | Channel *c = channel_lookup(id); | |
2793 | if (c == NULL) { | |
2794 | log("channel_open: %d: bad id", id); | |
2795 | return; | |
2796 | } | |
0b242b12 | 2797 | debug("send channel open %d", id); |
7e7327a1 | 2798 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
2799 | packet_put_cstring(c->ctype); | |
2800 | packet_put_int(c->self); | |
2801 | packet_put_int(c->local_window); | |
2802 | packet_put_int(c->local_maxpacket); | |
0b242b12 | 2803 | } |
2804 | void | |
2805 | channel_open(int id) | |
2806 | { | |
2807 | /* XXX REMOVE ME */ | |
2808 | channel_start_open(id); | |
7e7327a1 | 2809 | packet_send(); |
7e7327a1 | 2810 | } |
2811 | void | |
2812 | channel_request(int id, char *service, int wantconfirm) | |
2813 | { | |
2814 | channel_request_start(id, service, wantconfirm); | |
2815 | packet_send(); | |
2816 | debug("channel request %d: %s", id, service) ; | |
2817 | } | |
2818 | void | |
2819 | channel_request_start(int id, char *service, int wantconfirm) | |
2820 | { | |
2821 | Channel *c = channel_lookup(id); | |
2822 | if (c == NULL) { | |
2823 | log("channel_request: %d: bad id", id); | |
2824 | return; | |
2825 | } | |
2826 | packet_start(SSH2_MSG_CHANNEL_REQUEST); | |
2827 | packet_put_int(c->remote_id); | |
2828 | packet_put_cstring(service); | |
2829 | packet_put_char(wantconfirm); | |
2830 | } | |
2831 | void | |
2832 | channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg) | |
2833 | { | |
2834 | Channel *c = channel_lookup(id); | |
2835 | if (c == NULL) { | |
2836 | log("channel_register_callback: %d: bad id", id); | |
2837 | return; | |
2838 | } | |
2839 | c->cb_event = mtype; | |
2840 | c->cb_fn = fn; | |
2841 | c->cb_arg = arg; | |
2842 | } | |
2843 | void | |
2844 | channel_register_cleanup(int id, channel_callback_fn *fn) | |
2845 | { | |
2846 | Channel *c = channel_lookup(id); | |
2847 | if (c == NULL) { | |
2848 | log("channel_register_cleanup: %d: bad id", id); | |
2849 | return; | |
2850 | } | |
2851 | c->dettach_user = fn; | |
2852 | } | |
2853 | void | |
2854 | channel_cancel_cleanup(int id) | |
2855 | { | |
2856 | Channel *c = channel_lookup(id); | |
2857 | if (c == NULL) { | |
2858 | log("channel_cancel_cleanup: %d: bad id", id); | |
2859 | return; | |
2860 | } | |
2861 | c->dettach_user = NULL; | |
2862 | } | |
2b87da3b | 2863 | void |
2e73a022 | 2864 | channel_register_filter(int id, channel_filter_fn *fn) |
2865 | { | |
2866 | Channel *c = channel_lookup(id); | |
2867 | if (c == NULL) { | |
2868 | log("channel_register_filter: %d: bad id", id); | |
2869 | return; | |
2870 | } | |
2871 | c->input_filter = fn; | |
2872 | } | |
7e7327a1 | 2873 | |
2874 | void | |
a22aff1f | 2875 | channel_set_fds(int id, int rfd, int wfd, int efd, |
2876 | int extusage, int nonblock) | |
7e7327a1 | 2877 | { |
2878 | Channel *c = channel_lookup(id); | |
2879 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) | |
2880 | fatal("channel_activate for non-larval channel %d.", id); | |
a22aff1f | 2881 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
7e7327a1 | 2882 | c->type = SSH_CHANNEL_OPEN; |
7e7327a1 | 2883 | /* XXX window size? */ |
bcbf86ec | 2884 | c->local_window = c->local_window_max = c->local_maxpacket * 2; |
7e7327a1 | 2885 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
2886 | packet_put_int(c->remote_id); | |
2887 | packet_put_int(c->local_window); | |
2888 | packet_send(); | |
2889 | } |