Line data Source code
1 : /*
2 : Unix SMB/CIFS implementation.
3 : change notify handling
4 : Copyright (C) Andrew Tridgell 2000
5 : Copyright (C) Jeremy Allison 1994-1998
6 : Copyright (C) Volker Lendecke 2007
7 :
8 : This program is free software; you can redistribute it and/or modify
9 : it under the terms of the GNU General Public License as published by
10 : the Free Software Foundation; either version 3 of the License, or
11 : (at your option) any later version.
12 :
13 : This program is distributed in the hope that it will be useful,
14 : but WITHOUT ANY WARRANTY; without even the implied warranty of
15 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 : GNU General Public License for more details.
17 :
18 : You should have received a copy of the GNU General Public License
19 : along with this program. If not, see <http://www.gnu.org/licenses/>.
20 : */
21 :
22 : #include "includes.h"
23 : #include "smbd/smbd.h"
24 : #include "smbd/globals.h"
25 : #include "../librpc/gen_ndr/ndr_notify.h"
26 : #include "librpc/gen_ndr/ndr_file_id.h"
27 : #include "libcli/security/privileges.h"
28 : #include "libcli/security/security.h"
29 :
30 : struct notify_change_event {
31 : struct timespec when;
32 : uint32_t action;
33 : const char *name;
34 : };
35 :
36 : struct notify_change_buf {
37 : /*
38 : * Filters for reinitializing after notifyd has been restarted
39 : */
40 : uint32_t filter;
41 : uint32_t subdir_filter;
42 :
43 : /*
44 : * If no requests are pending, changes are queued here. Simple array,
45 : * we only append.
46 : */
47 :
48 : uint32_t max_buffer_size;
49 :
50 : /*
51 : * num_changes == -1 means that we have got a catch-all change, when
52 : * asked we just return NT_STATUS_OK without specific changes.
53 : */
54 : int num_changes;
55 : struct notify_change_event *changes;
56 :
57 : /*
58 : * If no changes are around requests are queued here. Using a linked
59 : * list, because we have to append at the end and delete from the top.
60 : */
61 : struct notify_change_request *requests;
62 : };
63 :
64 : struct notify_change_request {
65 : struct notify_change_request *prev, *next;
66 : struct files_struct *fsp; /* backpointer for cancel by mid */
67 : struct smb_request *req;
68 : uint32_t filter;
69 : uint32_t max_param;
70 : void (*reply_fn)(struct smb_request *req,
71 : NTSTATUS error_code,
72 : uint8_t *buf, size_t len);
73 : struct notify_mid_map *mid_map;
74 : void *backend_data;
75 : };
76 :
77 : static void notify_fsp(files_struct *fsp, struct timespec when,
78 : uint32_t action, const char *name);
79 :
80 60 : bool change_notify_fsp_has_changes(struct files_struct *fsp)
81 : {
82 60 : if (fsp == NULL) {
83 0 : return false;
84 : }
85 :
86 60 : if (fsp->notify == NULL) {
87 0 : return false;
88 : }
89 :
90 60 : if (fsp->notify->num_changes == 0) {
91 60 : return false;
92 : }
93 :
94 0 : return true;
95 : }
96 :
97 : /*
98 : * For NTCancel, we need to find the notify_change_request indexed by
99 : * mid. Separate list here.
100 : */
101 :
102 : struct notify_mid_map {
103 : struct notify_mid_map *prev, *next;
104 : struct notify_change_request *req;
105 : uint64_t mid;
106 : };
107 :
108 0 : static bool notify_change_record_identical(struct notify_change_event *c1,
109 : struct notify_change_event *c2)
110 : {
111 : /* Note this is deliberately case sensitive. */
112 0 : if (c1->action == c2->action &&
113 0 : strcmp(c1->name, c2->name) == 0) {
114 0 : return True;
115 : }
116 0 : return False;
117 : }
118 :
119 0 : static int compare_notify_change_events(const void *p1, const void *p2)
120 : {
121 0 : const struct notify_change_event *e1 = p1;
122 0 : const struct notify_change_event *e2 = p2;
123 :
124 0 : return timespec_compare(&e1->when, &e2->when);
125 : }
126 :
127 30 : static bool notify_marshall_changes(int num_changes,
128 : uint32_t max_offset,
129 : struct notify_change_event *changes,
130 : DATA_BLOB *final_blob)
131 : {
132 : int i;
133 :
134 30 : if (num_changes == -1) {
135 0 : return false;
136 : }
137 :
138 : /*
139 : * Sort the notifies by timestamp when the event happened to avoid
140 : * coalescing and thus dropping events.
141 : */
142 :
143 30 : qsort(changes, num_changes,
144 : sizeof(*changes), compare_notify_change_events);
145 :
146 90 : for (i=0; i<num_changes; i++) {
147 : enum ndr_err_code ndr_err;
148 : struct notify_change_event *c;
149 : struct FILE_NOTIFY_INFORMATION m;
150 : DATA_BLOB blob;
151 30 : uint16_t pad = 0;
152 :
153 : /* Coalesce any identical records. */
154 45 : while (i+1 < num_changes &&
155 0 : notify_change_record_identical(&changes[i],
156 0 : &changes[i+1])) {
157 0 : i++;
158 : }
159 :
160 30 : c = &changes[i];
161 :
162 30 : m.FileName1 = c->name;
163 30 : m.FileNameLength = strlen_m(c->name)*2;
164 30 : m.Action = c->action;
165 :
166 30 : m._pad = data_blob_null;
167 :
168 : /*
169 : * Offset to next entry, only if there is one
170 : */
171 :
172 30 : if (i == (num_changes-1)) {
173 30 : m.NextEntryOffset = 0;
174 : } else {
175 0 : if ((m.FileNameLength % 4) == 2) {
176 0 : m._pad = data_blob_const(&pad, 2);
177 : }
178 0 : m.NextEntryOffset =
179 0 : ndr_size_FILE_NOTIFY_INFORMATION(&m, 0);
180 : }
181 :
182 30 : ndr_err = ndr_push_struct_blob(&blob, talloc_tos(), &m,
183 : (ndr_push_flags_fn_t)ndr_push_FILE_NOTIFY_INFORMATION);
184 30 : if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
185 0 : return false;
186 : }
187 :
188 30 : if (DEBUGLEVEL >= 10) {
189 0 : NDR_PRINT_DEBUG(FILE_NOTIFY_INFORMATION, &m);
190 : }
191 :
192 45 : if (!data_blob_append(talloc_tos(), final_blob,
193 30 : blob.data, blob.length)) {
194 0 : data_blob_free(&blob);
195 0 : return false;
196 : }
197 :
198 30 : data_blob_free(&blob);
199 :
200 30 : if (final_blob->length > max_offset) {
201 : /* Too much data for client. */
202 0 : DEBUG(10, ("Client only wanted %d bytes, trying to "
203 : "marshall %d bytes\n", (int)max_offset,
204 : (int)final_blob->length));
205 0 : return False;
206 : }
207 : }
208 :
209 30 : return True;
210 : }
211 :
212 : /****************************************************************************
213 : Setup the common parts of the return packet and send it.
214 : *****************************************************************************/
215 :
216 60 : void change_notify_reply(struct smb_request *req,
217 : NTSTATUS error_code,
218 : uint32_t max_param,
219 : struct notify_change_buf *notify_buf,
220 : void (*reply_fn)(struct smb_request *req,
221 : NTSTATUS error_code,
222 : uint8_t *buf, size_t len))
223 : {
224 60 : DATA_BLOB blob = data_blob_null;
225 :
226 60 : if (!NT_STATUS_IS_OK(error_code)) {
227 30 : reply_fn(req, error_code, NULL, 0);
228 30 : return;
229 : }
230 :
231 30 : if (notify_buf == NULL) {
232 0 : reply_fn(req, NT_STATUS_OK, NULL, 0);
233 0 : return;
234 : }
235 :
236 30 : max_param = MIN(max_param, notify_buf->max_buffer_size);
237 :
238 30 : if (!notify_marshall_changes(notify_buf->num_changes, max_param,
239 : notify_buf->changes, &blob)) {
240 : /*
241 : * We exceed what the client is willing to accept. Send
242 : * nothing.
243 : */
244 0 : data_blob_free(&blob);
245 : }
246 :
247 30 : reply_fn(req, NT_STATUS_OK, blob.data, blob.length);
248 :
249 30 : data_blob_free(&blob);
250 :
251 30 : TALLOC_FREE(notify_buf->changes);
252 30 : notify_buf->num_changes = 0;
253 : }
254 :
255 : struct notify_fsp_state {
256 : struct files_struct *notified_fsp;
257 : struct timespec when;
258 : const struct notify_event *e;
259 : };
260 :
261 70 : static struct files_struct *notify_fsp_cb(struct files_struct *fsp,
262 : void *private_data)
263 : {
264 70 : struct notify_fsp_state *state = private_data;
265 :
266 70 : if (fsp == state->notified_fsp) {
267 52 : DBG_DEBUG("notify_callback called for %s\n", fsp_str_dbg(fsp));
268 52 : notify_fsp(fsp, state->when, state->e->action, state->e->path);
269 52 : return fsp;
270 : }
271 :
272 18 : return NULL;
273 : }
274 :
275 52 : void notify_callback(struct smbd_server_connection *sconn,
276 : void *private_data, struct timespec when,
277 : const struct notify_event *e)
278 : {
279 52 : struct notify_fsp_state state = {
280 : .notified_fsp = private_data, .when = when, .e = e
281 : };
282 52 : files_forall(sconn, notify_fsp_cb, &state);
283 52 : }
284 :
285 30 : NTSTATUS change_notify_create(struct files_struct *fsp,
286 : uint32_t max_buffer_size,
287 : uint32_t filter,
288 : bool recursive)
289 30 : {
290 30 : size_t len = fsp_fullbasepath(fsp, NULL, 0);
291 30 : char fullpath[len+1];
292 30 : NTSTATUS status = NT_STATUS_NOT_IMPLEMENTED;
293 :
294 : /*
295 : * Setting a changenotify needs READ/LIST access
296 : * on the directory handle.
297 : */
298 30 : if (!(fsp->access_mask & SEC_DIR_LIST)) {
299 0 : return NT_STATUS_ACCESS_DENIED;
300 : }
301 :
302 30 : if (fsp->notify != NULL) {
303 0 : DEBUG(1, ("change_notify_create: fsp->notify != NULL, "
304 : "fname = %s\n", fsp->fsp_name->base_name));
305 0 : return NT_STATUS_INVALID_PARAMETER;
306 : }
307 :
308 30 : if (!(fsp->notify = talloc_zero(NULL, struct notify_change_buf))) {
309 0 : DEBUG(0, ("talloc failed\n"));
310 0 : return NT_STATUS_NO_MEMORY;
311 : }
312 30 : fsp->notify->filter = filter;
313 30 : fsp->notify->subdir_filter = recursive ? filter : 0;
314 30 : fsp->notify->max_buffer_size = max_buffer_size;
315 :
316 30 : fsp_fullbasepath(fsp, fullpath, sizeof(fullpath));
317 :
318 : /*
319 : * Avoid /. at the end of the path name. notify can't deal with it.
320 : */
321 30 : if (len > 1 && fullpath[len-1] == '.' && fullpath[len-2] == '/') {
322 24 : fullpath[len-2] = '\0';
323 : }
324 :
325 30 : if ((fsp->notify->filter != 0) ||
326 0 : (fsp->notify->subdir_filter != 0)) {
327 45 : status = notify_add(fsp->conn->sconn->notify_ctx,
328 30 : fullpath, fsp->notify->filter,
329 30 : fsp->notify->subdir_filter, fsp);
330 : }
331 :
332 30 : return status;
333 : }
334 :
335 60 : NTSTATUS change_notify_add_request(struct smb_request *req,
336 : uint32_t max_param,
337 : uint32_t filter, bool recursive,
338 : struct files_struct *fsp,
339 : void (*reply_fn)(struct smb_request *req,
340 : NTSTATUS error_code,
341 : uint8_t *buf, size_t len))
342 : {
343 60 : struct notify_change_request *request = NULL;
344 60 : struct notify_mid_map *map = NULL;
345 60 : struct smbd_server_connection *sconn = req->sconn;
346 :
347 60 : DEBUG(10, ("change_notify_add_request: Adding request for %s: "
348 : "max_param = %d\n", fsp_str_dbg(fsp), (int)max_param));
349 :
350 60 : if (!(request = talloc(NULL, struct notify_change_request))
351 60 : || !(map = talloc(request, struct notify_mid_map))) {
352 0 : TALLOC_FREE(request);
353 0 : return NT_STATUS_NO_MEMORY;
354 : }
355 :
356 60 : request->mid_map = map;
357 60 : map->req = request;
358 :
359 60 : request->req = talloc_move(request, &req);
360 60 : request->max_param = max_param;
361 60 : request->filter = filter;
362 60 : request->fsp = fsp;
363 60 : request->reply_fn = reply_fn;
364 60 : request->backend_data = NULL;
365 :
366 60 : DLIST_ADD_END(fsp->notify->requests, request);
367 :
368 60 : map->mid = request->req->mid;
369 60 : DLIST_ADD(sconn->notify_mid_maps, map);
370 :
371 60 : return NT_STATUS_OK;
372 : }
373 :
374 60 : static void change_notify_remove_request(struct smbd_server_connection *sconn,
375 : struct notify_change_request *remove_req)
376 : {
377 : files_struct *fsp;
378 : struct notify_change_request *req;
379 :
380 : /*
381 : * Paranoia checks, the fsp referenced must must have the request in
382 : * its list of pending requests
383 : */
384 :
385 60 : fsp = remove_req->fsp;
386 60 : SMB_ASSERT(fsp->notify != NULL);
387 :
388 60 : for (req = fsp->notify->requests; req; req = req->next) {
389 60 : if (req == remove_req) {
390 60 : break;
391 : }
392 : }
393 :
394 60 : if (req == NULL) {
395 0 : smb_panic("notify_req not found in fsp's requests");
396 : }
397 :
398 60 : DLIST_REMOVE(fsp->notify->requests, req);
399 60 : DLIST_REMOVE(sconn->notify_mid_maps, req->mid_map);
400 60 : TALLOC_FREE(req);
401 60 : }
402 :
403 18 : static void smbd_notify_cancel_by_map(struct notify_mid_map *map)
404 : {
405 18 : struct smb_request *smbreq = map->req->req;
406 18 : struct smbd_server_connection *sconn = smbreq->sconn;
407 18 : struct smbd_smb2_request *smb2req = smbreq->smb2req;
408 18 : NTSTATUS notify_status = NT_STATUS_CANCELLED;
409 :
410 18 : if (smb2req != NULL) {
411 : NTSTATUS sstatus;
412 :
413 18 : if (smb2req->session == NULL) {
414 0 : sstatus = NT_STATUS_USER_SESSION_DELETED;
415 : } else {
416 18 : sstatus = smb2req->session->status;
417 : }
418 :
419 18 : if (NT_STATUS_EQUAL(sstatus, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
420 4 : sstatus = NT_STATUS_OK;
421 : }
422 :
423 18 : if (!NT_STATUS_IS_OK(sstatus)) {
424 0 : notify_status = NT_STATUS_NOTIFY_CLEANUP;
425 18 : } else if (smb2req->tcon == NULL) {
426 0 : notify_status = NT_STATUS_NOTIFY_CLEANUP;
427 18 : } else if (!NT_STATUS_IS_OK(smb2req->tcon->status)) {
428 0 : notify_status = NT_STATUS_NOTIFY_CLEANUP;
429 : }
430 : }
431 :
432 18 : change_notify_reply(smbreq, notify_status,
433 18 : 0, NULL, map->req->reply_fn);
434 18 : change_notify_remove_request(sconn, map->req);
435 18 : }
436 :
437 : /****************************************************************************
438 : Delete entries by mid from the change notify pending queue. Always send reply.
439 : *****************************************************************************/
440 :
441 0 : bool remove_pending_change_notify_requests_by_mid(
442 : struct smbd_server_connection *sconn, uint64_t mid)
443 : {
444 : struct notify_mid_map *map;
445 :
446 0 : for (map = sconn->notify_mid_maps; map; map = map->next) {
447 0 : if (map->mid == mid) {
448 0 : break;
449 : }
450 : }
451 :
452 0 : if (map == NULL) {
453 0 : return false;
454 : }
455 :
456 0 : smbd_notify_cancel_by_map(map);
457 0 : return true;
458 : }
459 :
460 18 : void smbd_notify_cancel_by_smbreq(const struct smb_request *smbreq)
461 : {
462 18 : struct smbd_server_connection *sconn = smbreq->sconn;
463 : struct notify_mid_map *map;
464 :
465 18 : for (map = sconn->notify_mid_maps; map; map = map->next) {
466 18 : if (map->req->req == smbreq) {
467 18 : break;
468 : }
469 : }
470 :
471 18 : if (map == NULL) {
472 0 : return;
473 : }
474 :
475 18 : smbd_notify_cancel_by_map(map);
476 : }
477 :
478 890 : static struct files_struct *smbd_notify_cancel_deleted_fn(
479 : struct files_struct *fsp, void *private_data)
480 : {
481 890 : struct file_id *fid = talloc_get_type_abort(
482 : private_data, struct file_id);
483 :
484 890 : if (file_id_equal(&fsp->file_id, fid)) {
485 803 : remove_pending_change_notify_requests_by_fid(
486 803 : fsp, NT_STATUS_DELETE_PENDING);
487 : }
488 890 : return NULL;
489 : }
490 :
491 1367 : void smbd_notify_cancel_deleted(struct messaging_context *msg,
492 : void *private_data, uint32_t msg_type,
493 : struct server_id server_id, DATA_BLOB *data)
494 : {
495 1367 : struct smbd_server_connection *sconn = talloc_get_type_abort(
496 : private_data, struct smbd_server_connection);
497 : struct file_id *fid;
498 : enum ndr_err_code ndr_err;
499 :
500 1367 : fid = talloc(talloc_tos(), struct file_id);
501 1367 : if (fid == NULL) {
502 0 : DEBUG(1, ("talloc failed\n"));
503 0 : return;
504 : }
505 :
506 1367 : ndr_err = ndr_pull_struct_blob_all(
507 : data, fid, fid, (ndr_pull_flags_fn_t)ndr_pull_file_id);
508 1367 : if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
509 0 : DEBUG(10, ("%s: ndr_pull_file_id failed: %s\n", __func__,
510 : ndr_errstr(ndr_err)));
511 0 : goto done;
512 : }
513 :
514 1367 : files_forall(sconn, smbd_notify_cancel_deleted_fn, fid);
515 :
516 1367 : done:
517 1367 : TALLOC_FREE(fid);
518 : }
519 :
520 0 : static struct files_struct *smbd_notifyd_reregister(struct files_struct *fsp,
521 : void *private_data)
522 : {
523 0 : DBG_DEBUG("reregister %s\n", fsp->fsp_name->base_name);
524 :
525 0 : if ((fsp->conn->sconn->notify_ctx != NULL) &&
526 0 : (fsp->notify != NULL) &&
527 0 : ((fsp->notify->filter != 0) ||
528 0 : (fsp->notify->subdir_filter != 0))) {
529 0 : size_t len = fsp_fullbasepath(fsp, NULL, 0);
530 0 : char fullpath[len+1];
531 :
532 : NTSTATUS status;
533 :
534 0 : fsp_fullbasepath(fsp, fullpath, sizeof(fullpath));
535 0 : if (len > 1 && fullpath[len-1] == '.' &&
536 0 : fullpath[len-2] == '/') {
537 0 : fullpath[len-2] = '\0';
538 : }
539 :
540 0 : status = notify_add(fsp->conn->sconn->notify_ctx,
541 0 : fullpath, fsp->notify->filter,
542 0 : fsp->notify->subdir_filter, fsp);
543 0 : if (!NT_STATUS_IS_OK(status)) {
544 0 : DBG_DEBUG("notify_add failed: %s\n",
545 : nt_errstr(status));
546 : }
547 : }
548 0 : return NULL;
549 : }
550 :
551 0 : void smbd_notifyd_restarted(struct messaging_context *msg,
552 : void *private_data, uint32_t msg_type,
553 : struct server_id server_id, DATA_BLOB *data)
554 : {
555 0 : struct smbd_server_connection *sconn = talloc_get_type_abort(
556 : private_data, struct smbd_server_connection);
557 :
558 0 : TALLOC_FREE(sconn->notify_ctx);
559 :
560 0 : sconn->notify_ctx = notify_init(sconn, sconn->msg_ctx,
561 : sconn, notify_callback);
562 0 : if (sconn->notify_ctx == NULL) {
563 0 : DBG_DEBUG("notify_init failed\n");
564 0 : return;
565 : }
566 :
567 0 : files_forall(sconn, smbd_notifyd_reregister, sconn->notify_ctx);
568 : }
569 :
570 : /****************************************************************************
571 : Delete entries by fnum from the change notify pending queue.
572 : *****************************************************************************/
573 :
574 11019 : void remove_pending_change_notify_requests_by_fid(files_struct *fsp,
575 : NTSTATUS status)
576 : {
577 11019 : if (fsp->notify == NULL) {
578 10989 : return;
579 : }
580 :
581 57 : while (fsp->notify->requests != NULL) {
582 12 : change_notify_reply(fsp->notify->requests->req,
583 : status, 0, NULL,
584 12 : fsp->notify->requests->reply_fn);
585 12 : change_notify_remove_request(fsp->conn->sconn,
586 12 : fsp->notify->requests);
587 : }
588 : }
589 :
590 3382 : void notify_fname(connection_struct *conn, uint32_t action, uint32_t filter,
591 : const char *path)
592 : {
593 3382 : struct notify_context *notify_ctx = conn->sconn->notify_ctx;
594 :
595 3382 : if (path[0] == '.' && path[1] == '/') {
596 0 : path += 2;
597 : }
598 :
599 3382 : notify_trigger(notify_ctx, action, filter, conn->connectpath, path);
600 3382 : }
601 :
602 12 : static bool user_can_stat_name_under_fsp(files_struct *fsp, const char *name)
603 : {
604 : uint32_t rights;
605 12 : struct smb_filename *fname = NULL;
606 12 : char *filepath = NULL;
607 : NTSTATUS status;
608 12 : char *p = NULL;
609 :
610 : /*
611 : * Assume we get filepath (relative to the share)
612 : * like this:
613 : *
614 : * 'dir1/dir2/dir3/file'
615 : *
616 : * We start with LIST and TRAVERSE on the
617 : * direct parent ('dir1/dir2/dir3')
618 : *
619 : * Then we switch to just TRAVERSE for
620 : * the rest: 'dir1/dir2', 'dir1', '.'
621 : *
622 : * For a file in the share root, we'll have
623 : * 'file'
624 : * and would just check '.' with LIST and TRAVERSE.
625 : *
626 : * It's important to always check '.' as the last step,
627 : * which means we check the permissions of the share root
628 : * directory.
629 : */
630 :
631 12 : if (ISDOT(fsp->fsp_name->base_name)) {
632 6 : filepath = talloc_strdup(talloc_tos(), name);
633 : } else {
634 6 : filepath = talloc_asprintf(talloc_tos(),
635 : "%s/%s",
636 6 : fsp->fsp_name->base_name,
637 : name);
638 : }
639 12 : if (filepath == NULL) {
640 0 : DBG_ERR("Memory allocation failed\n");
641 0 : return false;
642 : }
643 :
644 12 : rights = SEC_DIR_LIST|SEC_DIR_TRAVERSE;
645 12 : p = strrchr_m(filepath, '/');
646 : /*
647 : * Check each path component, exluding the share root.
648 : *
649 : * We could check all components including root using
650 : * a do { .. } while() loop, but IMHO the logic is clearer
651 : * having the share root check separately afterwards.
652 : */
653 22 : while (p != NULL) {
654 12 : *p = '\0';
655 12 : status = synthetic_pathref(talloc_tos(),
656 12 : fsp->conn->cwd_fsp,
657 : filepath,
658 : NULL,
659 : NULL,
660 : 0,
661 : 0,
662 : &fname);
663 12 : if (!NT_STATUS_IS_OK(status)) {
664 0 : DBG_ERR("synthetic_pathref failed for %s, error %s\n",
665 : filepath,
666 : nt_errstr(status));
667 0 : TALLOC_FREE(fname);
668 0 : TALLOC_FREE(filepath);
669 0 : return false;
670 : }
671 :
672 12 : status = smbd_check_access_rights_fsp(fsp->conn->cwd_fsp,
673 12 : fname->fsp,
674 : false,
675 : rights);
676 12 : if (!NT_STATUS_IS_OK(status)) {
677 8 : DBG_DEBUG("Access rights for %s/%s: %s\n",
678 : fsp->conn->connectpath,
679 : filepath,
680 : nt_errstr(status));
681 8 : TALLOC_FREE(fname);
682 8 : TALLOC_FREE(filepath);
683 8 : return false;
684 : }
685 :
686 4 : TALLOC_FREE(fname);
687 4 : rights = SEC_DIR_TRAVERSE;
688 4 : p = strrchr_m(filepath, '/');
689 : }
690 :
691 4 : TALLOC_FREE(filepath);
692 :
693 : /* Finally check share root. */
694 4 : filepath = talloc_strdup(talloc_tos(), ".");
695 4 : if (filepath == NULL) {
696 0 : DBG_ERR("Memory allocation failed\n");
697 0 : return false;
698 : }
699 4 : status = synthetic_pathref(talloc_tos(),
700 4 : fsp->conn->cwd_fsp,
701 : filepath,
702 : NULL,
703 : NULL,
704 : 0,
705 : 0,
706 : &fname);
707 4 : if (!NT_STATUS_IS_OK(status)) {
708 0 : DBG_ERR("synthetic_pathref failed for %s, error %s\n",
709 : filepath,
710 : nt_errstr(status));
711 0 : TALLOC_FREE(fname);
712 0 : TALLOC_FREE(filepath);
713 0 : return false;
714 : }
715 4 : status = smbd_check_access_rights_fsp(fsp->conn->cwd_fsp,
716 4 : fname->fsp,
717 : false,
718 : rights);
719 4 : if (!NT_STATUS_IS_OK(status)) {
720 0 : DBG_DEBUG("TRAVERSE access rights for %s failed with %s\n",
721 : fsp->conn->connectpath,
722 : nt_errstr(status));
723 0 : TALLOC_FREE(fname);
724 0 : TALLOC_FREE(filepath);
725 0 : return false;
726 : }
727 4 : TALLOC_FREE(fname);
728 4 : TALLOC_FREE(filepath);
729 4 : return true;
730 : }
731 :
732 52 : static void notify_fsp(files_struct *fsp, struct timespec when,
733 : uint32_t action, const char *name)
734 : {
735 : struct notify_change_event *change, *changes;
736 : char *tmp;
737 :
738 52 : if (fsp->notify == NULL) {
739 : /*
740 : * Nobody is waiting, don't queue
741 : */
742 11 : return;
743 : }
744 :
745 52 : if (lp_honor_change_notify_privilege(SNUM(fsp->conn))) {
746 : bool has_sec_change_notify_privilege;
747 38 : bool expose = false;
748 :
749 38 : has_sec_change_notify_privilege = security_token_has_privilege(
750 38 : fsp->conn->session_info->security_token,
751 : SEC_PRIV_CHANGE_NOTIFY);
752 :
753 38 : if (has_sec_change_notify_privilege) {
754 26 : expose = true;
755 : } else {
756 : bool ok;
757 :
758 12 : ok = become_user_without_service_by_fsp(fsp);
759 12 : if (ok) {
760 12 : expose = user_can_stat_name_under_fsp(fsp, name);
761 12 : unbecome_user_without_service();
762 : }
763 : }
764 38 : DBG_DEBUG("has_sec_change_notify_privilege=%s "
765 : "expose=%s for %s notify %s\n",
766 : has_sec_change_notify_privilege ? "true" : "false",
767 : expose ? "true" : "false",
768 : fsp->fsp_name->base_name, name);
769 38 : if (!expose) {
770 8 : return;
771 : }
772 : }
773 :
774 : /*
775 : * Someone has triggered a notify previously, queue the change for
776 : * later.
777 : */
778 :
779 44 : if ((fsp->notify->num_changes > 1000) || (name == NULL)) {
780 : /*
781 : * The real number depends on the client buf, just provide a
782 : * guard against a DoS here. If name == NULL the CN backend is
783 : * alerting us to a problem. Possibly dropped events. Clear
784 : * queued changes and send the catch-all response to the client
785 : * if a request is pending.
786 : */
787 0 : TALLOC_FREE(fsp->notify->changes);
788 0 : fsp->notify->num_changes = -1;
789 0 : if (fsp->notify->requests != NULL) {
790 0 : change_notify_reply(fsp->notify->requests->req,
791 0 : NT_STATUS_OK,
792 0 : fsp->notify->requests->max_param,
793 : fsp->notify,
794 0 : fsp->notify->requests->reply_fn);
795 0 : change_notify_remove_request(fsp->conn->sconn,
796 0 : fsp->notify->requests);
797 : }
798 0 : return;
799 : }
800 :
801 : /* If we've exceeded the server side queue or received a NULL name
802 : * from the underlying CN implementation, don't queue up any more
803 : * requests until we can send a catch-all response to the client */
804 44 : if (fsp->notify->num_changes == -1) {
805 0 : return;
806 : }
807 :
808 44 : if (!(changes = talloc_realloc(
809 : fsp->notify, fsp->notify->changes,
810 : struct notify_change_event,
811 : fsp->notify->num_changes+1))) {
812 0 : DEBUG(0, ("talloc_realloc failed\n"));
813 0 : return;
814 : }
815 :
816 44 : fsp->notify->changes = changes;
817 :
818 44 : change = &(fsp->notify->changes[fsp->notify->num_changes]);
819 :
820 44 : if (!(tmp = talloc_strdup(changes, name))) {
821 0 : DEBUG(0, ("talloc_strdup failed\n"));
822 0 : return;
823 : }
824 :
825 44 : string_replace(tmp, '/', '\\');
826 44 : change->name = tmp;
827 :
828 44 : change->when = when;
829 44 : change->action = action;
830 44 : fsp->notify->num_changes += 1;
831 :
832 44 : if (fsp->notify->requests == NULL) {
833 : /*
834 : * Nobody is waiting, so don't send anything. The ot
835 : */
836 14 : return;
837 : }
838 :
839 30 : if (action == NOTIFY_ACTION_OLD_NAME) {
840 : /*
841 : * We have to send the two rename events in one reply. So hold
842 : * the first part back.
843 : */
844 0 : return;
845 : }
846 :
847 : /*
848 : * Someone is waiting for the change, trigger the reply immediately.
849 : *
850 : * TODO: do we have to walk the lists of requests pending?
851 : */
852 :
853 60 : change_notify_reply(fsp->notify->requests->req,
854 30 : NT_STATUS_OK,
855 30 : fsp->notify->requests->max_param,
856 : fsp->notify,
857 30 : fsp->notify->requests->reply_fn);
858 :
859 30 : change_notify_remove_request(fsp->conn->sconn, fsp->notify->requests);
860 : }
861 :
862 0 : char *notify_filter_string(TALLOC_CTX *mem_ctx, uint32_t filter)
863 : {
864 0 : char *result = NULL;
865 :
866 0 : result = talloc_strdup(mem_ctx, "");
867 :
868 0 : if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
869 0 : result = talloc_asprintf_append(result, "FILE_NAME|");
870 0 : if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
871 0 : result = talloc_asprintf_append(result, "DIR_NAME|");
872 0 : if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
873 0 : result = talloc_asprintf_append(result, "ATTRIBUTES|");
874 0 : if (filter & FILE_NOTIFY_CHANGE_SIZE)
875 0 : result = talloc_asprintf_append(result, "SIZE|");
876 0 : if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
877 0 : result = talloc_asprintf_append(result, "LAST_WRITE|");
878 0 : if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
879 0 : result = talloc_asprintf_append(result, "LAST_ACCESS|");
880 0 : if (filter & FILE_NOTIFY_CHANGE_CREATION)
881 0 : result = talloc_asprintf_append(result, "CREATION|");
882 0 : if (filter & FILE_NOTIFY_CHANGE_EA)
883 0 : result = talloc_asprintf_append(result, "EA|");
884 0 : if (filter & FILE_NOTIFY_CHANGE_SECURITY)
885 0 : result = talloc_asprintf_append(result, "SECURITY|");
886 0 : if (filter & FILE_NOTIFY_CHANGE_STREAM_NAME)
887 0 : result = talloc_asprintf_append(result, "STREAM_NAME|");
888 0 : if (filter & FILE_NOTIFY_CHANGE_STREAM_SIZE)
889 0 : result = talloc_asprintf_append(result, "STREAM_SIZE|");
890 0 : if (filter & FILE_NOTIFY_CHANGE_STREAM_WRITE)
891 0 : result = talloc_asprintf_append(result, "STREAM_WRITE|");
892 :
893 0 : if (result == NULL) return NULL;
894 0 : if (*result == '\0') return result;
895 :
896 0 : result[strlen(result)-1] = '\0';
897 0 : return result;
898 : }
899 :
900 0 : struct sys_notify_context *sys_notify_context_create(TALLOC_CTX *mem_ctx,
901 : struct tevent_context *ev)
902 : {
903 : struct sys_notify_context *ctx;
904 :
905 0 : if (!(ctx = talloc(mem_ctx, struct sys_notify_context))) {
906 0 : DEBUG(0, ("talloc failed\n"));
907 0 : return NULL;
908 : }
909 :
910 0 : ctx->ev = ev;
911 0 : ctx->private_data = NULL;
912 0 : return ctx;
913 : }
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