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 2800 : bool change_notify_fsp_has_changes(struct files_struct *fsp)
81 : {
82 2800 : if (fsp == NULL) {
83 0 : return false;
84 : }
85 :
86 2800 : if (fsp->notify == NULL) {
87 0 : return false;
88 : }
89 :
90 2800 : if (fsp->notify->num_changes == 0) {
91 2691 : return false;
92 : }
93 :
94 109 : 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 1079 : 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 1079 : if (c1->action == c2->action &&
113 300 : strcmp(c1->name, c2->name) == 0) {
114 0 : return True;
115 : }
116 1079 : return False;
117 : }
118 :
119 3286 : static int compare_notify_change_events(const void *p1, const void *p2)
120 : {
121 3286 : const struct notify_change_event *e1 = p1;
122 3286 : const struct notify_change_event *e2 = p2;
123 :
124 3286 : return timespec_compare(&e1->when, &e2->when);
125 : }
126 :
127 243 : 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 0 : int i;
133 :
134 243 : 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 :
143 243 : qsort(changes, num_changes,
144 : sizeof(*changes), compare_notify_change_events);
145 :
146 1555 : for (i=0; i<num_changes; i++) {
147 0 : enum ndr_err_code ndr_err;
148 0 : struct notify_change_event *c;
149 0 : struct FILE_NOTIFY_INFORMATION m;
150 0 : DATA_BLOB blob;
151 1318 : uint16_t pad = 0;
152 :
153 : /* Coalesce any identical records. */
154 2397 : while (i+1 < num_changes &&
155 1079 : notify_change_record_identical(&changes[i],
156 1079 : &changes[i+1])) {
157 0 : i++;
158 : }
159 :
160 1318 : c = &changes[i];
161 :
162 1318 : m.FileName1 = c->name;
163 1318 : m.FileNameLength = strlen_m(c->name)*2;
164 1318 : m.Action = c->action;
165 :
166 1318 : m._pad = data_blob_null;
167 :
168 : /*
169 : * Offset to next entry, only if there is one
170 : */
171 :
172 1318 : if (i == (num_changes-1)) {
173 239 : m.NextEntryOffset = 0;
174 : } else {
175 1079 : if ((m.FileNameLength % 4) == 2) {
176 456 : m._pad = data_blob_const(&pad, 2);
177 : }
178 1079 : m.NextEntryOffset =
179 1079 : ndr_size_FILE_NOTIFY_INFORMATION(&m, 0);
180 : }
181 :
182 1318 : ndr_err = ndr_push_struct_blob(&blob, talloc_tos(), &m,
183 : (ndr_push_flags_fn_t)ndr_push_FILE_NOTIFY_INFORMATION);
184 1318 : if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
185 6 : return false;
186 : }
187 :
188 1318 : if (DEBUGLEVEL >= 10) {
189 0 : NDR_PRINT_DEBUG(FILE_NOTIFY_INFORMATION, &m);
190 : }
191 :
192 1318 : if (!data_blob_append(talloc_tos(), final_blob,
193 1318 : blob.data, blob.length)) {
194 0 : data_blob_free(&blob);
195 0 : return false;
196 : }
197 :
198 1318 : data_blob_free(&blob);
199 :
200 1318 : if (final_blob->length > max_offset) {
201 : /* Too much data for client. */
202 6 : DEBUG(10, ("Client only wanted %d bytes, trying to "
203 : "marshall %d bytes\n", (int)max_offset,
204 : (int)final_blob->length));
205 6 : return False;
206 : }
207 : }
208 :
209 237 : return True;
210 : }
211 :
212 : /****************************************************************************
213 : Setup the common parts of the return packet and send it.
214 : *****************************************************************************/
215 :
216 2800 : 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 2800 : DATA_BLOB blob = data_blob_null;
225 :
226 2800 : if (!NT_STATUS_IS_OK(error_code)) {
227 2547 : reply_fn(req, error_code, NULL, 0);
228 2573 : return;
229 : }
230 :
231 253 : if (notify_buf == NULL) {
232 10 : reply_fn(req, NT_STATUS_OK, NULL, 0);
233 10 : return;
234 : }
235 :
236 243 : max_param = MIN(max_param, notify_buf->max_buffer_size);
237 :
238 243 : 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 6 : data_blob_free(&blob);
245 : }
246 :
247 243 : reply_fn(req, NT_STATUS_OK, blob.data, blob.length);
248 :
249 243 : data_blob_free(&blob);
250 :
251 243 : TALLOC_FREE(notify_buf->changes);
252 243 : 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 9396 : static struct files_struct *notify_fsp_cb(struct files_struct *fsp,
262 : void *private_data)
263 : {
264 9396 : struct notify_fsp_state *state = private_data;
265 :
266 9396 : if (fsp == state->notified_fsp) {
267 1966 : DBG_DEBUG("notify_callback called for %s\n", fsp_str_dbg(fsp));
268 1966 : notify_fsp(fsp, state->when, state->e->action, state->e->path);
269 1966 : return fsp;
270 : }
271 :
272 7430 : return NULL;
273 : }
274 :
275 1967 : void notify_callback(struct smbd_server_connection *sconn,
276 : void *private_data, struct timespec when,
277 : const struct notify_event *e)
278 : {
279 1967 : struct notify_fsp_state state = {
280 : .notified_fsp = private_data, .when = when, .e = e
281 : };
282 1967 : files_forall(sconn, notify_fsp_cb, &state);
283 1967 : }
284 :
285 1868 : NTSTATUS change_notify_create(struct files_struct *fsp,
286 : uint32_t max_buffer_size,
287 : uint32_t filter,
288 : bool recursive)
289 1868 : {
290 1868 : size_t len = fsp_fullbasepath(fsp, NULL, 0);
291 1868 : char fullpath[len+1];
292 1868 : NTSTATUS status = NT_STATUS_NOT_IMPLEMENTED;
293 :
294 : /*
295 : * Setting a changenotify needs READ/LIST access
296 : * on the directory handle.
297 : */
298 1868 : status = check_any_access_fsp(fsp, SEC_DIR_LIST);
299 1868 : if (!NT_STATUS_IS_OK(status)) {
300 2 : return status;
301 : }
302 :
303 1866 : if (fsp->notify != NULL) {
304 0 : DEBUG(1, ("change_notify_create: fsp->notify != NULL, "
305 : "fname = %s\n", fsp->fsp_name->base_name));
306 0 : return NT_STATUS_INVALID_PARAMETER;
307 : }
308 :
309 1866 : if (!(fsp->notify = talloc_zero(NULL, struct notify_change_buf))) {
310 0 : DEBUG(0, ("talloc failed\n"));
311 0 : return NT_STATUS_NO_MEMORY;
312 : }
313 1866 : fsp->notify->filter = filter;
314 1866 : fsp->notify->subdir_filter = recursive ? filter : 0;
315 1866 : fsp->notify->max_buffer_size = max_buffer_size;
316 :
317 1866 : fsp_fullbasepath(fsp, fullpath, sizeof(fullpath));
318 :
319 1866 : if ((fsp->notify->filter != 0) ||
320 0 : (fsp->notify->subdir_filter != 0)) {
321 1866 : status = notify_add(fsp->conn->sconn->notify_ctx,
322 1850 : fullpath, fsp->notify->filter,
323 1850 : fsp->notify->subdir_filter, fsp);
324 : }
325 :
326 1866 : return status;
327 : }
328 :
329 2691 : NTSTATUS change_notify_add_request(struct smb_request *req,
330 : uint32_t max_param,
331 : uint32_t filter, bool recursive,
332 : struct files_struct *fsp,
333 : void (*reply_fn)(struct smb_request *req,
334 : NTSTATUS error_code,
335 : uint8_t *buf, size_t len))
336 : {
337 2691 : struct notify_change_request *request = NULL;
338 2691 : struct notify_mid_map *map = NULL;
339 2691 : struct smbd_server_connection *sconn = req->sconn;
340 :
341 2691 : DEBUG(10, ("change_notify_add_request: Adding request for %s: "
342 : "max_param = %d\n", fsp_str_dbg(fsp), (int)max_param));
343 :
344 2691 : if (!(request = talloc(NULL, struct notify_change_request))
345 2691 : || !(map = talloc(request, struct notify_mid_map))) {
346 0 : TALLOC_FREE(request);
347 0 : return NT_STATUS_NO_MEMORY;
348 : }
349 :
350 2691 : request->mid_map = map;
351 2691 : map->req = request;
352 :
353 2691 : request->req = talloc_move(request, &req);
354 2691 : request->max_param = max_param;
355 2691 : request->filter = filter;
356 2691 : request->fsp = fsp;
357 2691 : request->reply_fn = reply_fn;
358 2691 : request->backend_data = NULL;
359 :
360 2691 : DLIST_ADD_END(fsp->notify->requests, request);
361 :
362 2691 : map->mid = request->req->mid;
363 2691 : DLIST_ADD(sconn->notify_mid_maps, map);
364 :
365 2691 : return NT_STATUS_OK;
366 : }
367 :
368 2691 : static void change_notify_remove_request(struct smbd_server_connection *sconn,
369 : struct notify_change_request *remove_req)
370 : {
371 16 : files_struct *fsp;
372 16 : struct notify_change_request *req;
373 :
374 : /*
375 : * Paranoia checks, the fsp referenced must must have the request in
376 : * its list of pending requests
377 : */
378 :
379 2691 : fsp = remove_req->fsp;
380 2691 : SMB_ASSERT(fsp->notify != NULL);
381 :
382 2691 : for (req = fsp->notify->requests; req; req = req->next) {
383 2691 : if (req == remove_req) {
384 2675 : break;
385 : }
386 : }
387 :
388 2691 : if (req == NULL) {
389 0 : smb_panic("notify_req not found in fsp's requests");
390 : }
391 :
392 2691 : DLIST_REMOVE(fsp->notify->requests, req);
393 2691 : DLIST_REMOVE(sconn->notify_mid_maps, req->mid_map);
394 2691 : TALLOC_FREE(req);
395 2691 : }
396 :
397 2519 : static void smbd_notify_cancel_by_map(struct notify_mid_map *map)
398 : {
399 2519 : struct smb_request *smbreq = map->req->req;
400 2519 : struct smbd_server_connection *sconn = smbreq->sconn;
401 2519 : struct smbd_smb2_request *smb2req = smbreq->smb2req;
402 2519 : NTSTATUS notify_status = NT_STATUS_CANCELLED;
403 :
404 2519 : if (smb2req != NULL) {
405 16 : NTSTATUS sstatus;
406 :
407 1578 : if (smb2req->session == NULL) {
408 0 : sstatus = NT_STATUS_USER_SESSION_DELETED;
409 : } else {
410 1578 : sstatus = smb2req->session->status;
411 : }
412 :
413 1578 : if (NT_STATUS_EQUAL(sstatus, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
414 10 : sstatus = NT_STATUS_OK;
415 : }
416 :
417 1578 : if (!NT_STATUS_IS_OK(sstatus)) {
418 6 : notify_status = NT_STATUS_NOTIFY_CLEANUP;
419 1572 : } else if (smb2req->tcon == NULL) {
420 0 : notify_status = NT_STATUS_NOTIFY_CLEANUP;
421 1572 : } else if (!NT_STATUS_IS_OK(smb2req->tcon->status)) {
422 2 : notify_status = NT_STATUS_NOTIFY_CLEANUP;
423 : }
424 : }
425 :
426 2519 : change_notify_reply(smbreq, notify_status,
427 2503 : 0, NULL, map->req->reply_fn);
428 2519 : change_notify_remove_request(sconn, map->req);
429 2519 : }
430 :
431 : /****************************************************************************
432 : Delete entries by mid from the change notify pending queue. Always send reply.
433 : *****************************************************************************/
434 :
435 1006 : bool remove_pending_change_notify_requests_by_mid(
436 : struct smbd_server_connection *sconn, uint64_t mid)
437 : {
438 0 : struct notify_mid_map *map;
439 :
440 1010 : for (map = sconn->notify_mid_maps; map; map = map->next) {
441 945 : if (map->mid == mid) {
442 941 : break;
443 : }
444 : }
445 :
446 1006 : if (map == NULL) {
447 65 : return false;
448 : }
449 :
450 941 : smbd_notify_cancel_by_map(map);
451 941 : return true;
452 : }
453 :
454 1578 : void smbd_notify_cancel_by_smbreq(const struct smb_request *smbreq)
455 : {
456 1578 : struct smbd_server_connection *sconn = smbreq->sconn;
457 16 : struct notify_mid_map *map;
458 :
459 1578 : for (map = sconn->notify_mid_maps; map; map = map->next) {
460 1578 : if (map->req->req == smbreq) {
461 1562 : break;
462 : }
463 : }
464 :
465 1578 : if (map == NULL) {
466 0 : return;
467 : }
468 :
469 1578 : smbd_notify_cancel_by_map(map);
470 : }
471 :
472 212247 : static struct files_struct *smbd_notify_cancel_deleted_fn(
473 : struct files_struct *fsp, void *private_data)
474 : {
475 212247 : struct file_id *fid = talloc_get_type_abort(
476 : private_data, struct file_id);
477 :
478 212247 : if (file_id_equal(&fsp->file_id, fid)) {
479 4061 : remove_pending_change_notify_requests_by_fid(
480 4061 : fsp, NT_STATUS_DELETE_PENDING);
481 : }
482 212247 : return NULL;
483 : }
484 :
485 150543 : void smbd_notify_cancel_deleted(struct messaging_context *msg,
486 : void *private_data, uint32_t msg_type,
487 : struct server_id server_id, DATA_BLOB *data)
488 : {
489 150543 : struct smbd_server_connection *sconn = talloc_get_type_abort(
490 : private_data, struct smbd_server_connection);
491 355 : struct file_id *fid;
492 355 : enum ndr_err_code ndr_err;
493 :
494 150543 : fid = talloc(talloc_tos(), struct file_id);
495 150543 : if (fid == NULL) {
496 0 : DEBUG(1, ("talloc failed\n"));
497 0 : return;
498 : }
499 :
500 150543 : ndr_err = ndr_pull_struct_blob_all(
501 : data, fid, fid, (ndr_pull_flags_fn_t)ndr_pull_file_id);
502 150543 : if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
503 0 : DEBUG(10, ("%s: ndr_pull_file_id failed: %s\n", __func__,
504 : ndr_errstr(ndr_err)));
505 0 : goto done;
506 : }
507 :
508 150543 : files_forall(sconn, smbd_notify_cancel_deleted_fn, fid);
509 :
510 150543 : done:
511 150543 : TALLOC_FREE(fid);
512 : }
513 :
514 0 : static struct files_struct *smbd_notifyd_reregister(struct files_struct *fsp,
515 : void *private_data)
516 : {
517 0 : DBG_DEBUG("reregister %s\n", fsp->fsp_name->base_name);
518 :
519 0 : if ((fsp->conn->sconn->notify_ctx != NULL) &&
520 0 : (fsp->notify != NULL) &&
521 0 : ((fsp->notify->filter != 0) ||
522 0 : (fsp->notify->subdir_filter != 0))) {
523 0 : size_t len = fsp_fullbasepath(fsp, NULL, 0);
524 0 : char fullpath[len+1];
525 :
526 0 : NTSTATUS status;
527 :
528 0 : fsp_fullbasepath(fsp, fullpath, sizeof(fullpath));
529 :
530 0 : status = notify_add(fsp->conn->sconn->notify_ctx,
531 0 : fullpath, fsp->notify->filter,
532 0 : fsp->notify->subdir_filter, fsp);
533 0 : if (!NT_STATUS_IS_OK(status)) {
534 0 : DBG_DEBUG("notify_add failed: %s\n",
535 : nt_errstr(status));
536 : }
537 : }
538 0 : return NULL;
539 : }
540 :
541 0 : void smbd_notifyd_restarted(struct messaging_context *msg,
542 : void *private_data, uint32_t msg_type,
543 : struct server_id server_id, DATA_BLOB *data)
544 : {
545 0 : struct smbd_server_connection *sconn = talloc_get_type_abort(
546 : private_data, struct smbd_server_connection);
547 :
548 0 : TALLOC_FREE(sconn->notify_ctx);
549 :
550 0 : sconn->notify_ctx = notify_init(sconn, sconn->msg_ctx,
551 : sconn, notify_callback);
552 0 : if (sconn->notify_ctx == NULL) {
553 0 : DBG_DEBUG("notify_init failed\n");
554 0 : return;
555 : }
556 :
557 0 : files_forall(sconn, smbd_notifyd_reregister, sconn->notify_ctx);
558 : }
559 :
560 : /****************************************************************************
561 : Delete entries by fnum from the change notify pending queue.
562 : *****************************************************************************/
563 :
564 86816 : void remove_pending_change_notify_requests_by_fid(files_struct *fsp,
565 : NTSTATUS status)
566 : {
567 86816 : if (fsp->notify == NULL) {
568 84563 : return;
569 : }
570 :
571 1916 : while (fsp->notify->requests != NULL) {
572 38 : change_notify_reply(fsp->notify->requests->req,
573 : status, 0, NULL,
574 38 : fsp->notify->requests->reply_fn);
575 38 : change_notify_remove_request(fsp->conn->sconn,
576 38 : fsp->notify->requests);
577 : }
578 : }
579 :
580 360004 : void notify_fname(connection_struct *conn, uint32_t action, uint32_t filter,
581 : const char *path)
582 : {
583 360004 : struct notify_context *notify_ctx = conn->sconn->notify_ctx;
584 :
585 360004 : if (path[0] == '.' && path[1] == '/') {
586 0 : path += 2;
587 : }
588 :
589 360004 : notify_trigger(notify_ctx, action, filter, conn->connectpath, path);
590 360004 : }
591 :
592 12 : static bool user_can_stat_name_under_fsp(files_struct *fsp, const char *name)
593 : {
594 0 : uint32_t rights;
595 12 : struct smb_filename *fname = NULL;
596 12 : char *filepath = NULL;
597 0 : NTSTATUS status;
598 12 : char *p = NULL;
599 :
600 : /*
601 : * Assume we get filepath (relative to the share)
602 : * like this:
603 : *
604 : * 'dir1/dir2/dir3/file'
605 : *
606 : * We start with LIST and TRAVERSE on the
607 : * direct parent ('dir1/dir2/dir3')
608 : *
609 : * Then we switch to just TRAVERSE for
610 : * the rest: 'dir1/dir2', 'dir1', '.'
611 : *
612 : * For a file in the share root, we'll have
613 : * 'file'
614 : * and would just check '.' with LIST and TRAVERSE.
615 : *
616 : * It's important to always check '.' as the last step,
617 : * which means we check the permissions of the share root
618 : * directory.
619 : */
620 :
621 12 : if (ISDOT(fsp->fsp_name->base_name)) {
622 6 : filepath = talloc_strdup(talloc_tos(), name);
623 : } else {
624 6 : filepath = talloc_asprintf(talloc_tos(),
625 : "%s/%s",
626 6 : fsp->fsp_name->base_name,
627 : name);
628 : }
629 12 : if (filepath == NULL) {
630 0 : DBG_ERR("Memory allocation failed\n");
631 0 : return false;
632 : }
633 :
634 12 : rights = SEC_DIR_LIST|SEC_DIR_TRAVERSE;
635 12 : p = strrchr_m(filepath, '/');
636 : /*
637 : * Check each path component, excluding the share root.
638 : *
639 : * We could check all components including root using
640 : * a do { .. } while() loop, but IMHO the logic is clearer
641 : * having the share root check separately afterwards.
642 : */
643 16 : while (p != NULL) {
644 12 : *p = '\0';
645 12 : status = synthetic_pathref(talloc_tos(),
646 12 : fsp->conn->cwd_fsp,
647 : filepath,
648 : NULL,
649 : NULL,
650 : 0,
651 : 0,
652 : &fname);
653 12 : if (!NT_STATUS_IS_OK(status)) {
654 0 : int dbg_lvl = DBGLVL_ERR;
655 0 : if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
656 0 : dbg_lvl = DBGLVL_DEBUG;
657 : }
658 0 : DBG_PREFIX(dbg_lvl, (
659 : "synthetic_pathref failed for %s, error %s\n",
660 : filepath,
661 : nt_errstr(status)));
662 0 : TALLOC_FREE(fname);
663 0 : TALLOC_FREE(filepath);
664 0 : return false;
665 : }
666 :
667 12 : status = smbd_check_access_rights_fsp(fsp->conn->cwd_fsp,
668 12 : fname->fsp,
669 : false,
670 : rights);
671 12 : if (!NT_STATUS_IS_OK(status)) {
672 8 : DBG_DEBUG("Access rights for %s/%s: %s\n",
673 : fsp->conn->connectpath,
674 : filepath,
675 : nt_errstr(status));
676 8 : TALLOC_FREE(fname);
677 8 : TALLOC_FREE(filepath);
678 8 : return false;
679 : }
680 :
681 4 : TALLOC_FREE(fname);
682 4 : rights = SEC_DIR_TRAVERSE;
683 4 : p = strrchr_m(filepath, '/');
684 : }
685 :
686 4 : TALLOC_FREE(filepath);
687 :
688 : /* Finally check share root. */
689 4 : filepath = talloc_strdup(talloc_tos(), ".");
690 4 : if (filepath == NULL) {
691 0 : DBG_ERR("Memory allocation failed\n");
692 0 : return false;
693 : }
694 4 : status = synthetic_pathref(talloc_tos(),
695 4 : fsp->conn->cwd_fsp,
696 : filepath,
697 : NULL,
698 : NULL,
699 : 0,
700 : 0,
701 : &fname);
702 4 : if (!NT_STATUS_IS_OK(status)) {
703 0 : DBG_ERR("synthetic_pathref failed for %s, error %s\n",
704 : filepath,
705 : nt_errstr(status));
706 0 : TALLOC_FREE(fname);
707 0 : TALLOC_FREE(filepath);
708 0 : return false;
709 : }
710 4 : status = smbd_check_access_rights_fsp(fsp->conn->cwd_fsp,
711 4 : fname->fsp,
712 : false,
713 : rights);
714 4 : if (!NT_STATUS_IS_OK(status)) {
715 0 : DBG_DEBUG("TRAVERSE access rights for %s failed with %s\n",
716 : fsp->conn->connectpath,
717 : nt_errstr(status));
718 0 : TALLOC_FREE(fname);
719 0 : TALLOC_FREE(filepath);
720 0 : return false;
721 : }
722 4 : TALLOC_FREE(fname);
723 4 : TALLOC_FREE(filepath);
724 4 : return true;
725 : }
726 :
727 1966 : static void notify_fsp(files_struct *fsp, struct timespec when,
728 : uint32_t action, const char *name)
729 : {
730 13 : struct notify_change_event *change, *changes;
731 13 : char *tmp;
732 :
733 1966 : if (fsp->notify == NULL) {
734 : /*
735 : * Nobody is waiting, don't queue
736 : */
737 1832 : return;
738 : }
739 :
740 1966 : if (lp_honor_change_notify_privilege(SNUM(fsp->conn))) {
741 0 : bool has_sec_change_notify_privilege;
742 38 : bool expose = false;
743 :
744 38 : has_sec_change_notify_privilege = security_token_has_privilege(
745 38 : fsp->conn->session_info->security_token,
746 : SEC_PRIV_CHANGE_NOTIFY);
747 :
748 38 : if (has_sec_change_notify_privilege) {
749 26 : expose = true;
750 : } else {
751 0 : bool ok;
752 :
753 12 : ok = become_user_without_service_by_fsp(fsp);
754 12 : if (ok) {
755 12 : expose = user_can_stat_name_under_fsp(fsp, name);
756 12 : unbecome_user_without_service();
757 : }
758 : }
759 38 : DBG_DEBUG("has_sec_change_notify_privilege=%s "
760 : "expose=%s for %s notify %s\n",
761 : has_sec_change_notify_privilege ? "true" : "false",
762 : expose ? "true" : "false",
763 : fsp->fsp_name->base_name, name);
764 38 : if (!expose) {
765 8 : return;
766 : }
767 : }
768 :
769 : /*
770 : * Someone has triggered a notify previously, queue the change for
771 : * later.
772 : */
773 :
774 1958 : if ((fsp->notify->num_changes > 1000) || (name == NULL)) {
775 : /*
776 : * The real number depends on the client buf, just provide a
777 : * guard against a DoS here. If name == NULL the CN backend is
778 : * alerting us to a problem. Possibly dropped events. Clear
779 : * queued changes and send the catch-all response to the client
780 : * if a request is pending.
781 : */
782 0 : TALLOC_FREE(fsp->notify->changes);
783 0 : fsp->notify->num_changes = -1;
784 0 : if (fsp->notify->requests != NULL) {
785 0 : change_notify_reply(fsp->notify->requests->req,
786 0 : NT_STATUS_OK,
787 0 : fsp->notify->requests->max_param,
788 : fsp->notify,
789 0 : fsp->notify->requests->reply_fn);
790 0 : change_notify_remove_request(fsp->conn->sconn,
791 0 : fsp->notify->requests);
792 : }
793 0 : return;
794 : }
795 :
796 : /* If we've exceeded the server side queue or received a NULL name
797 : * from the underlying CN implementation, don't queue up any more
798 : * requests until we can send a catch-all response to the client */
799 1958 : if (fsp->notify->num_changes == -1) {
800 0 : return;
801 : }
802 :
803 1958 : if (!(changes = talloc_realloc(
804 : fsp->notify, fsp->notify->changes,
805 : struct notify_change_event,
806 : fsp->notify->num_changes+1))) {
807 0 : DEBUG(0, ("talloc_realloc failed\n"));
808 0 : return;
809 : }
810 :
811 1958 : fsp->notify->changes = changes;
812 :
813 1958 : change = &(fsp->notify->changes[fsp->notify->num_changes]);
814 :
815 1958 : if (!(tmp = talloc_strdup(changes, name))) {
816 0 : DEBUG(0, ("talloc_strdup failed\n"));
817 0 : return;
818 : }
819 :
820 1958 : string_replace(tmp, '/', '\\');
821 1958 : change->name = tmp;
822 :
823 1958 : change->when = when;
824 1958 : change->action = action;
825 1958 : fsp->notify->num_changes += 1;
826 :
827 1958 : if (fsp->notify->requests == NULL) {
828 : /*
829 : * Nobody is waiting, so don't send anything. The ot
830 : */
831 1805 : return;
832 : }
833 :
834 140 : if (action == NOTIFY_ACTION_OLD_NAME) {
835 : /*
836 : * We have to send the two rename events in one reply. So hold
837 : * the first part back.
838 : */
839 6 : return;
840 : }
841 :
842 : /*
843 : * Someone is waiting for the change, trigger the reply immediately.
844 : *
845 : * TODO: do we have to walk the lists of requests pending?
846 : */
847 :
848 134 : change_notify_reply(fsp->notify->requests->req,
849 134 : NT_STATUS_OK,
850 134 : fsp->notify->requests->max_param,
851 : fsp->notify,
852 134 : fsp->notify->requests->reply_fn);
853 :
854 134 : change_notify_remove_request(fsp->conn->sconn, fsp->notify->requests);
855 : }
856 :
857 1070 : char *notify_filter_string(TALLOC_CTX *mem_ctx, uint32_t filter)
858 : {
859 1070 : char *result = NULL;
860 :
861 1070 : result = talloc_strdup(mem_ctx, "");
862 1070 : if (result == NULL) {
863 0 : return NULL;
864 : }
865 :
866 1070 : if (filter & FILE_NOTIFY_CHANGE_FILE_NAME) {
867 188 : result = talloc_asprintf_append(result, "FILE_NAME|");
868 188 : if (result == NULL) {
869 0 : return NULL;
870 : }
871 : }
872 1070 : if (filter & FILE_NOTIFY_CHANGE_DIR_NAME) {
873 180 : result = talloc_asprintf_append(result, "DIR_NAME|");
874 180 : if (result == NULL) {
875 0 : return NULL;
876 : }
877 : }
878 1070 : if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES) {
879 44 : result = talloc_asprintf_append(result, "ATTRIBUTES|");
880 44 : if (result == NULL) {
881 0 : return NULL;
882 : }
883 : }
884 1070 : if (filter & FILE_NOTIFY_CHANGE_SIZE) {
885 28 : result = talloc_asprintf_append(result, "SIZE|");
886 28 : if (result == NULL) {
887 0 : return NULL;
888 : }
889 : }
890 1070 : if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE) {
891 28 : result = talloc_asprintf_append(result, "LAST_WRITE|");
892 28 : if (result == NULL) {
893 0 : return NULL;
894 : }
895 : }
896 1070 : if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS) {
897 28 : result = talloc_asprintf_append(result, "LAST_ACCESS|");
898 28 : if (result == NULL) {
899 0 : return NULL;
900 : }
901 : }
902 1070 : if (filter & FILE_NOTIFY_CHANGE_CREATION) {
903 36 : result = talloc_asprintf_append(result, "CREATION|");
904 36 : if (result == NULL) {
905 0 : return NULL;
906 : }
907 : }
908 1070 : if (filter & FILE_NOTIFY_CHANGE_EA) {
909 28 : result = talloc_asprintf_append(result, "EA|");
910 28 : if (result == NULL) {
911 0 : return NULL;
912 : }
913 : }
914 1070 : if (filter & FILE_NOTIFY_CHANGE_SECURITY) {
915 28 : result = talloc_asprintf_append(result, "SECURITY|");
916 28 : if (result == NULL) {
917 0 : return NULL;
918 : }
919 : }
920 1070 : if (filter & FILE_NOTIFY_CHANGE_STREAM_NAME) {
921 30 : result = talloc_asprintf_append(result, "STREAM_NAME|");
922 30 : if (result == NULL) {
923 0 : return NULL;
924 : }
925 : }
926 1070 : if (filter & FILE_NOTIFY_CHANGE_STREAM_SIZE) {
927 28 : result = talloc_asprintf_append(result, "STREAM_SIZE|");
928 28 : if (result == NULL) {
929 0 : return NULL;
930 : }
931 : }
932 1070 : if (filter & FILE_NOTIFY_CHANGE_STREAM_WRITE) {
933 28 : result = talloc_asprintf_append(result, "STREAM_WRITE|");
934 28 : if (result == NULL) {
935 0 : return NULL;
936 : }
937 : }
938 :
939 1070 : if (*result == '\0') return result;
940 :
941 506 : result[strlen(result)-1] = '\0';
942 506 : return result;
943 : }
944 :
945 0 : struct sys_notify_context *sys_notify_context_create(TALLOC_CTX *mem_ctx,
946 : struct tevent_context *ev)
947 : {
948 0 : struct sys_notify_context *ctx;
949 :
950 0 : if (!(ctx = talloc(mem_ctx, struct sys_notify_context))) {
951 0 : DEBUG(0, ("talloc failed\n"));
952 0 : return NULL;
953 : }
954 :
955 0 : ctx->ev = ev;
956 0 : ctx->private_data = NULL;
957 0 : return ctx;
958 : }
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