source: vendor/current/source3/smbd/smb2_tcon.c

Last change on this file was 988, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.3
File size: 17.2 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Core SMB2 server
4
5 Copyright (C) Stefan Metzmacher 2009
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
19*/
20
21#include "includes.h"
22#include "smbd/smbd.h"
23#include "smbd/globals.h"
24#include "../libcli/smb/smb_common.h"
25#include "../libcli/security/security.h"
26#include "auth.h"
27#include "lib/param/loadparm.h"
28#include "../lib/util/tevent_ntstatus.h"
29
30static struct tevent_req *smbd_smb2_tree_connect_send(TALLOC_CTX *mem_ctx,
31 struct tevent_context *ev,
32 struct smbd_smb2_request *smb2req,
33 const char *in_path);
34static NTSTATUS smbd_smb2_tree_connect_recv(struct tevent_req *req,
35 uint8_t *out_share_type,
36 uint32_t *out_share_flags,
37 uint32_t *out_capabilities,
38 uint32_t *out_maximal_access,
39 uint32_t *out_tree_id,
40 bool *disconnect);
41
42static void smbd_smb2_request_tcon_done(struct tevent_req *subreq);
43
44NTSTATUS smbd_smb2_request_process_tcon(struct smbd_smb2_request *req)
45{
46 const uint8_t *inbody;
47 uint16_t in_path_offset;
48 uint16_t in_path_length;
49 DATA_BLOB in_path_buffer;
50 char *in_path_string;
51 size_t in_path_string_size;
52 NTSTATUS status;
53 bool ok;
54 struct tevent_req *subreq;
55
56 status = smbd_smb2_request_verify_sizes(req, 0x09);
57 if (!NT_STATUS_IS_OK(status)) {
58 return smbd_smb2_request_error(req, status);
59 }
60 inbody = SMBD_SMB2_IN_BODY_PTR(req);
61
62 in_path_offset = SVAL(inbody, 0x04);
63 in_path_length = SVAL(inbody, 0x06);
64
65 if (in_path_offset != (SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(req))) {
66 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
67 }
68
69 if (in_path_length > SMBD_SMB2_IN_DYN_LEN(req)) {
70 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
71 }
72
73 in_path_buffer.data = SMBD_SMB2_IN_DYN_PTR(req);
74 in_path_buffer.length = in_path_length;
75
76 ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
77 in_path_buffer.data,
78 in_path_buffer.length,
79 &in_path_string,
80 &in_path_string_size);
81 if (!ok) {
82 return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
83 }
84
85 if (in_path_buffer.length == 0) {
86 in_path_string_size = 0;
87 }
88
89 if (strlen(in_path_string) != in_path_string_size) {
90 return smbd_smb2_request_error(req, NT_STATUS_BAD_NETWORK_NAME);
91 }
92
93 subreq = smbd_smb2_tree_connect_send(req,
94 req->sconn->ev_ctx,
95 req,
96 in_path_string);
97 if (subreq == NULL) {
98 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
99 }
100 tevent_req_set_callback(subreq, smbd_smb2_request_tcon_done, req);
101
102 return smbd_smb2_request_pending_queue(req, subreq, 500);
103}
104
105static void smbd_smb2_request_tcon_done(struct tevent_req *subreq)
106{
107 struct smbd_smb2_request *req =
108 tevent_req_callback_data(subreq,
109 struct smbd_smb2_request);
110 uint8_t *outhdr;
111 DATA_BLOB outbody;
112 uint8_t out_share_type = 0;
113 uint32_t out_share_flags = 0;
114 uint32_t out_capabilities = 0;
115 uint32_t out_maximal_access = 0;
116 uint32_t out_tree_id = 0;
117 bool disconnect = false;
118 NTSTATUS status;
119 NTSTATUS error;
120
121 status = smbd_smb2_tree_connect_recv(subreq,
122 &out_share_type,
123 &out_share_flags,
124 &out_capabilities,
125 &out_maximal_access,
126 &out_tree_id,
127 &disconnect);
128 TALLOC_FREE(subreq);
129 if (!NT_STATUS_IS_OK(status)) {
130 if (disconnect) {
131 smbd_server_connection_terminate(req->xconn,
132 nt_errstr(status));
133 return;
134 }
135 error = smbd_smb2_request_error(req, status);
136 if (!NT_STATUS_IS_OK(error)) {
137 smbd_server_connection_terminate(req->xconn,
138 nt_errstr(error));
139 return;
140 }
141 return;
142 }
143
144 outhdr = SMBD_SMB2_OUT_HDR_PTR(req);
145
146 outbody = smbd_smb2_generate_outbody(req, 0x10);
147 if (outbody.data == NULL) {
148 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
149 if (!NT_STATUS_IS_OK(error)) {
150 smbd_server_connection_terminate(req->xconn,
151 nt_errstr(error));
152 return;
153 }
154 return;
155 }
156
157 SIVAL(outhdr, SMB2_HDR_TID, out_tree_id);
158
159 SSVAL(outbody.data, 0x00, 0x10); /* struct size */
160 SCVAL(outbody.data, 0x02,
161 out_share_type); /* share type */
162 SCVAL(outbody.data, 0x03, 0); /* reserved */
163 SIVAL(outbody.data, 0x04,
164 out_share_flags); /* share flags */
165 SIVAL(outbody.data, 0x08,
166 out_capabilities); /* capabilities */
167 SIVAL(outbody.data, 0x0C,
168 out_maximal_access); /* maximal access */
169
170 error = smbd_smb2_request_done(req, outbody, NULL);
171 if (!NT_STATUS_IS_OK(error)) {
172 smbd_server_connection_terminate(req->xconn,
173 nt_errstr(error));
174 return;
175 }
176}
177
178static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
179 const char *in_path,
180 uint8_t *out_share_type,
181 uint32_t *out_share_flags,
182 uint32_t *out_capabilities,
183 uint32_t *out_maximal_access,
184 uint32_t *out_tree_id,
185 bool *disconnect)
186{
187 struct smbXsrv_connection *conn = req->xconn;
188 const char *share = in_path;
189 char *service = NULL;
190 int snum = -1;
191 struct smbXsrv_tcon *tcon;
192 NTTIME now = timeval_to_nttime(&req->request_time);
193 connection_struct *compat_conn = NULL;
194 struct user_struct *compat_vuser = req->session->compat;
195 NTSTATUS status;
196 bool encryption_desired = req->session->global->encryption_flags & SMBXSRV_ENCRYPTION_DESIRED;
197 bool encryption_required = req->session->global->encryption_flags & SMBXSRV_ENCRYPTION_REQUIRED;
198 bool guest_session = false;
199 bool require_signed_tcon = false;
200
201 *disconnect = false;
202
203 if (strncmp(share, "\\\\", 2) == 0) {
204 const char *p = strchr(share+2, '\\');
205 if (p) {
206 share = p + 1;
207 }
208 }
209
210 DEBUG(10,("smbd_smb2_tree_connect: path[%s] share[%s]\n",
211 in_path, share));
212
213 if (security_session_user_level(compat_vuser->session_info, NULL) < SECURITY_USER) {
214 guest_session = true;
215 }
216
217 if (conn->protocol >= PROTOCOL_SMB3_11 && !guest_session) {
218 require_signed_tcon = true;
219 }
220
221 if (require_signed_tcon && !req->do_encryption && !req->do_signing) {
222 DEBUG(1, ("smbd_smb2_tree_connect: reject request to share "
223 "[%s] as '%s\\%s' without encryption or signing. "
224 "Disconnecting.\n",
225 share,
226 req->session->global->auth_session_info->info->domain_name,
227 req->session->global->auth_session_info->info->account_name));
228 *disconnect = true;
229 return NT_STATUS_ACCESS_DENIED;
230 }
231
232 service = talloc_strdup(talloc_tos(), share);
233 if(!service) {
234 return NT_STATUS_NO_MEMORY;
235 }
236
237 if (!strlower_m(service)) {
238 DEBUG(2, ("strlower_m %s failed\n", service));
239 return NT_STATUS_INVALID_PARAMETER;
240 }
241
242 /* TODO: do more things... */
243 if (strequal(service,HOMES_NAME)) {
244 if (compat_vuser->homes_snum == -1) {
245 DEBUG(2, ("[homes] share not available for "
246 "user %s because it was not found "
247 "or created at session setup "
248 "time\n",
249 compat_vuser->session_info->unix_info->unix_name));
250 return NT_STATUS_BAD_NETWORK_NAME;
251 }
252 snum = compat_vuser->homes_snum;
253 } else if ((compat_vuser->homes_snum != -1)
254 && strequal(service,
255 lp_servicename(talloc_tos(), compat_vuser->homes_snum))) {
256 snum = compat_vuser->homes_snum;
257 } else {
258 snum = find_service(talloc_tos(), service, &service);
259 if (!service) {
260 return NT_STATUS_NO_MEMORY;
261 }
262 }
263
264 if (snum < 0) {
265 DEBUG(3,("smbd_smb2_tree_connect: couldn't find service %s\n",
266 service));
267 return NT_STATUS_BAD_NETWORK_NAME;
268 }
269
270 if ((lp_smb_encrypt(snum) >= SMB_SIGNING_DESIRED) &&
271 (conn->smb2.client.capabilities & SMB2_CAP_ENCRYPTION)) {
272 encryption_desired = true;
273 }
274
275 if (lp_smb_encrypt(snum) == SMB_SIGNING_REQUIRED) {
276 encryption_desired = true;
277 encryption_required = true;
278 }
279
280 if (guest_session && encryption_required) {
281 DEBUG(1,("reject guest as encryption is required for service %s\n",
282 service));
283 return NT_STATUS_ACCESS_DENIED;
284 }
285
286 if (conn->smb2.server.cipher == 0) {
287 if (encryption_required) {
288 DEBUG(1,("reject tcon with dialect[0x%04X] "
289 "as encryption is required for service %s\n",
290 conn->smb2.server.dialect, service));
291 return NT_STATUS_ACCESS_DENIED;
292 }
293 }
294
295 /* create a new tcon as child of the session */
296 status = smb2srv_tcon_create(req->session, now, &tcon);
297 if (!NT_STATUS_IS_OK(status)) {
298 return status;
299 }
300
301 if (encryption_desired) {
302 tcon->global->encryption_flags |= SMBXSRV_ENCRYPTION_DESIRED;
303 }
304 if (encryption_required) {
305 tcon->global->encryption_flags |= SMBXSRV_ENCRYPTION_REQUIRED;
306 }
307
308 compat_conn = make_connection_smb2(req,
309 tcon, snum,
310 req->session->compat,
311 "???",
312 &status);
313 if (compat_conn == NULL) {
314 TALLOC_FREE(tcon);
315 return status;
316 }
317
318 tcon->global->share_name = lp_servicename(tcon->global,
319 SNUM(compat_conn));
320 if (tcon->global->share_name == NULL) {
321 conn_free(compat_conn);
322 TALLOC_FREE(tcon);
323 return NT_STATUS_NO_MEMORY;
324 }
325 tcon->global->session_global_id =
326 req->session->global->session_global_id;
327
328 tcon->compat = talloc_move(tcon, &compat_conn);
329
330 tcon->status = NT_STATUS_OK;
331
332 status = smbXsrv_tcon_update(tcon);
333 if (!NT_STATUS_IS_OK(status)) {
334 TALLOC_FREE(tcon);
335 return status;
336 }
337
338 if (IS_PRINT(tcon->compat)) {
339 *out_share_type = SMB2_SHARE_TYPE_PRINT;
340 } else if (IS_IPC(tcon->compat)) {
341 *out_share_type = SMB2_SHARE_TYPE_PIPE;
342 } else {
343 *out_share_type = SMB2_SHARE_TYPE_DISK;
344 }
345
346 *out_share_flags = 0;
347
348 if (lp_msdfs_root(SNUM(tcon->compat)) && lp_host_msdfs()) {
349 *out_share_flags |= (SMB2_SHAREFLAG_DFS|SMB2_SHAREFLAG_DFS_ROOT);
350 *out_capabilities = SMB2_SHARE_CAP_DFS;
351 } else {
352 *out_capabilities = 0;
353 }
354
355 switch(lp_csc_policy(SNUM(tcon->compat))) {
356 case CSC_POLICY_MANUAL:
357 break;
358 case CSC_POLICY_DOCUMENTS:
359 *out_share_flags |= SMB2_SHAREFLAG_AUTO_CACHING;
360 break;
361 case CSC_POLICY_PROGRAMS:
362 *out_share_flags |= SMB2_SHAREFLAG_VDO_CACHING;
363 break;
364 case CSC_POLICY_DISABLE:
365 *out_share_flags |= SMB2_SHAREFLAG_NO_CACHING;
366 break;
367 default:
368 break;
369 }
370
371 if (lp_hide_unreadable(SNUM(tcon->compat)) ||
372 lp_hide_unwriteable_files(SNUM(tcon->compat))) {
373 *out_share_flags |= SMB2_SHAREFLAG_ACCESS_BASED_DIRECTORY_ENUM;
374 }
375
376 if (encryption_desired) {
377 *out_share_flags |= SMB2_SHAREFLAG_ENCRYPT_DATA;
378 }
379
380 *out_maximal_access = tcon->compat->share_access;
381
382 *out_tree_id = tcon->global->tcon_wire_id;
383 return NT_STATUS_OK;
384}
385
386struct smbd_smb2_tree_connect_state {
387 const char *in_path;
388 uint8_t out_share_type;
389 uint32_t out_share_flags;
390 uint32_t out_capabilities;
391 uint32_t out_maximal_access;
392 uint32_t out_tree_id;
393 bool disconnect;
394};
395
396static struct tevent_req *smbd_smb2_tree_connect_send(TALLOC_CTX *mem_ctx,
397 struct tevent_context *ev,
398 struct smbd_smb2_request *smb2req,
399 const char *in_path)
400{
401 struct tevent_req *req;
402 struct smbd_smb2_tree_connect_state *state;
403 NTSTATUS status;
404
405 req = tevent_req_create(mem_ctx, &state,
406 struct smbd_smb2_tree_connect_state);
407 if (req == NULL) {
408 return NULL;
409 }
410 state->in_path = in_path;
411
412 status = smbd_smb2_tree_connect(smb2req,
413 state->in_path,
414 &state->out_share_type,
415 &state->out_share_flags,
416 &state->out_capabilities,
417 &state->out_maximal_access,
418 &state->out_tree_id,
419 &state->disconnect);
420 if (tevent_req_nterror(req, status)) {
421 return tevent_req_post(req, ev);
422 }
423
424 tevent_req_done(req);
425 return tevent_req_post(req, ev);
426}
427
428static NTSTATUS smbd_smb2_tree_connect_recv(struct tevent_req *req,
429 uint8_t *out_share_type,
430 uint32_t *out_share_flags,
431 uint32_t *out_capabilities,
432 uint32_t *out_maximal_access,
433 uint32_t *out_tree_id,
434 bool *disconnect)
435{
436 struct smbd_smb2_tree_connect_state *state =
437 tevent_req_data(req,
438 struct smbd_smb2_tree_connect_state);
439 NTSTATUS status;
440
441 if (tevent_req_is_nterror(req, &status)) {
442 tevent_req_received(req);
443 return status;
444 }
445
446 *out_share_type = state->out_share_type;
447 *out_share_flags = state->out_share_flags;
448 *out_capabilities = state->out_capabilities;
449 *out_maximal_access = state->out_maximal_access;
450 *out_tree_id = state->out_tree_id;
451 *disconnect = state->disconnect;
452
453 tevent_req_received(req);
454 return NT_STATUS_OK;
455}
456
457static struct tevent_req *smbd_smb2_tdis_send(TALLOC_CTX *mem_ctx,
458 struct tevent_context *ev,
459 struct smbd_smb2_request *smb2req);
460static NTSTATUS smbd_smb2_tdis_recv(struct tevent_req *req);
461static void smbd_smb2_request_tdis_done(struct tevent_req *subreq);
462
463NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
464{
465 NTSTATUS status;
466 struct tevent_req *subreq = NULL;
467
468 status = smbd_smb2_request_verify_sizes(req, 0x04);
469 if (!NT_STATUS_IS_OK(status)) {
470 return smbd_smb2_request_error(req, status);
471 }
472
473 subreq = smbd_smb2_tdis_send(req, req->sconn->ev_ctx, req);
474 if (subreq == NULL) {
475 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
476 }
477 tevent_req_set_callback(subreq, smbd_smb2_request_tdis_done, req);
478
479 /*
480 * Wait a long time before going async on this to allow
481 * requests we're waiting on to finish. Set timeout to 10 secs.
482 */
483 return smbd_smb2_request_pending_queue(req, subreq, 10000000);
484}
485
486static void smbd_smb2_request_tdis_done(struct tevent_req *subreq)
487{
488 struct smbd_smb2_request *smb2req =
489 tevent_req_callback_data(subreq,
490 struct smbd_smb2_request);
491 DATA_BLOB outbody;
492 NTSTATUS status;
493 NTSTATUS error;
494
495 status = smbd_smb2_tdis_recv(subreq);
496 TALLOC_FREE(subreq);
497 if (!NT_STATUS_IS_OK(status)) {
498 error = smbd_smb2_request_error(smb2req, status);
499 if (!NT_STATUS_IS_OK(error)) {
500 smbd_server_connection_terminate(smb2req->xconn,
501 nt_errstr(error));
502 return;
503 }
504 return;
505 }
506
507 outbody = smbd_smb2_generate_outbody(smb2req, 0x04);
508 if (outbody.data == NULL) {
509 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
510 if (!NT_STATUS_IS_OK(error)) {
511 smbd_server_connection_terminate(smb2req->xconn,
512 nt_errstr(error));
513 return;
514 }
515 return;
516 }
517
518 SSVAL(outbody.data, 0x00, 0x04); /* struct size */
519 SSVAL(outbody.data, 0x02, 0); /* reserved */
520
521 error = smbd_smb2_request_done(smb2req, outbody, NULL);
522 if (!NT_STATUS_IS_OK(error)) {
523 smbd_server_connection_terminate(smb2req->xconn,
524 nt_errstr(error));
525 return;
526 }
527}
528
529struct smbd_smb2_tdis_state {
530 struct smbd_smb2_request *smb2req;
531 struct tevent_queue *wait_queue;
532};
533
534static void smbd_smb2_tdis_wait_done(struct tevent_req *subreq);
535
536static struct tevent_req *smbd_smb2_tdis_send(TALLOC_CTX *mem_ctx,
537 struct tevent_context *ev,
538 struct smbd_smb2_request *smb2req)
539{
540 struct tevent_req *req;
541 struct smbd_smb2_tdis_state *state;
542 struct tevent_req *subreq;
543 struct smbXsrv_connection *xconn = NULL;
544
545 req = tevent_req_create(mem_ctx, &state,
546 struct smbd_smb2_tdis_state);
547 if (req == NULL) {
548 return NULL;
549 }
550 state->smb2req = smb2req;
551
552 state->wait_queue = tevent_queue_create(state, "tdis_wait_queue");
553 if (tevent_req_nomem(state->wait_queue, req)) {
554 return tevent_req_post(req, ev);
555 }
556
557 /*
558 * Make sure that no new request will be able to use this tcon.
559 */
560 smb2req->tcon->status = NT_STATUS_NETWORK_NAME_DELETED;
561
562 xconn = smb2req->xconn->client->connections;
563 for (; xconn != NULL; xconn = xconn->next) {
564 struct smbd_smb2_request *preq;
565
566 for (preq = xconn->smb2.requests; preq != NULL; preq = preq->next) {
567 if (preq == smb2req) {
568 /* Can't cancel current request. */
569 continue;
570 }
571 if (preq->tcon != smb2req->tcon) {
572 /* Request on different tcon. */
573 continue;
574 }
575
576 /*
577 * Never cancel anything in a compound
578 * request. Way too hard to deal with
579 * the result.
580 */
581 if (!preq->compound_related && preq->subreq != NULL) {
582 tevent_req_cancel(preq->subreq);
583 }
584
585 /*
586 * Now wait until the request is finished.
587 *
588 * We don't set a callback, as we just want to block the
589 * wait queue and the talloc_free() of the request will
590 * remove the item from the wait queue.
591 */
592 subreq = tevent_queue_wait_send(preq, ev, state->wait_queue);
593 if (tevent_req_nomem(subreq, req)) {
594 return tevent_req_post(req, ev);
595 }
596 }
597 }
598
599 /*
600 * Now we add our own waiter to the end of the queue,
601 * this way we get notified when all pending requests are finished
602 * and send to the socket.
603 */
604 subreq = tevent_queue_wait_send(state, ev, state->wait_queue);
605 if (tevent_req_nomem(subreq, req)) {
606 return tevent_req_post(req, ev);
607 }
608 tevent_req_set_callback(subreq, smbd_smb2_tdis_wait_done, req);
609
610 return req;
611}
612
613static void smbd_smb2_tdis_wait_done(struct tevent_req *subreq)
614{
615 struct tevent_req *req = tevent_req_callback_data(
616 subreq, struct tevent_req);
617 struct smbd_smb2_tdis_state *state = tevent_req_data(
618 req, struct smbd_smb2_tdis_state);
619 NTSTATUS status;
620
621 tevent_queue_wait_recv(subreq);
622 TALLOC_FREE(subreq);
623
624 /*
625 * As we've been awoken, we may have changed
626 * uid in the meantime. Ensure we're still
627 * root (SMB2_OP_TDIS has .as_root = true).
628 */
629 change_to_root_user();
630
631 status = smbXsrv_tcon_disconnect(state->smb2req->tcon,
632 state->smb2req->tcon->compat->vuid);
633 if (tevent_req_nterror(req, status)) {
634 return;
635 }
636
637 /* We did tear down the tcon. */
638 TALLOC_FREE(state->smb2req->tcon);
639 tevent_req_done(req);
640}
641
642static NTSTATUS smbd_smb2_tdis_recv(struct tevent_req *req)
643{
644 return tevent_req_simple_recv_ntstatus(req);
645}
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