smbd: Don't pass lease_idx down to set_share_mode()
[gd/samba-autobuild/.git] / source3 / smbd / open.c
1 /* 
2    Unix SMB/CIFS implementation.
3    file opening and share modes
4    Copyright (C) Andrew Tridgell 1992-1998
5    Copyright (C) Jeremy Allison 2001-2004
6    Copyright (C) Volker Lendecke 2005
7    Copyright (C) Ralph Boehme 2017
8
9    This program is free software; you can redistribute it and/or modify
10    it under the terms of the GNU General Public License as published by
11    the Free Software Foundation; either version 3 of the License, or
12    (at your option) any later version.
13
14    This program is distributed in the hope that it will be useful,
15    but WITHOUT ANY WARRANTY; without even the implied warranty of
16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17    GNU General Public License for more details.
18
19    You should have received a copy of the GNU General Public License
20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
21 */
22
23 #include "includes.h"
24 #include "system/filesys.h"
25 #include "lib/util/server_id.h"
26 #include "printing.h"
27 #include "smbd/smbd.h"
28 #include "smbd/globals.h"
29 #include "fake_file.h"
30 #include "../libcli/security/security.h"
31 #include "../librpc/gen_ndr/ndr_security.h"
32 #include "../librpc/gen_ndr/open_files.h"
33 #include "../librpc/gen_ndr/idmap.h"
34 #include "../librpc/gen_ndr/ioctl.h"
35 #include "passdb/lookup_sid.h"
36 #include "auth.h"
37 #include "serverid.h"
38 #include "messages.h"
39 #include "source3/lib/dbwrap/dbwrap_watch.h"
40 #include "locking/leases_db.h"
41 #include "librpc/gen_ndr/ndr_leases_db.h"
42
43 extern const struct generic_mapping file_generic_mapping;
44
45 struct deferred_open_record {
46         bool delayed_for_oplocks;
47         bool async_open;
48         struct file_id id;
49
50         /*
51          * Timer for async opens, needed because they don't use a watch on
52          * a locking.tdb record. This is currently only used for real async
53          * opens and just terminates smbd if the async open times out.
54          */
55         struct tevent_timer *te;
56 };
57
58 /****************************************************************************
59  If the requester wanted DELETE_ACCESS and was rejected because
60  the file ACL didn't include DELETE_ACCESS, see if the parent ACL
61  overrides this.
62 ****************************************************************************/
63
64 static bool parent_override_delete(connection_struct *conn,
65                                         const struct smb_filename *smb_fname,
66                                         uint32_t access_mask,
67                                         uint32_t rejected_mask)
68 {
69         if ((access_mask & DELETE_ACCESS) &&
70                     (rejected_mask & DELETE_ACCESS) &&
71                     can_delete_file_in_directory(conn, smb_fname)) {
72                 return true;
73         }
74         return false;
75 }
76
77 /****************************************************************************
78  Check if we have open rights.
79 ****************************************************************************/
80
81 NTSTATUS smbd_check_access_rights(struct connection_struct *conn,
82                                 const struct smb_filename *smb_fname,
83                                 bool use_privs,
84                                 uint32_t access_mask)
85 {
86         /* Check if we have rights to open. */
87         NTSTATUS status;
88         struct security_descriptor *sd = NULL;
89         uint32_t rejected_share_access;
90         uint32_t rejected_mask = access_mask;
91         uint32_t do_not_check_mask = 0;
92
93         rejected_share_access = access_mask & ~(conn->share_access);
94
95         if (rejected_share_access) {
96                 DEBUG(10, ("smbd_check_access_rights: rejected share access 0x%x "
97                         "on %s (0x%x)\n",
98                         (unsigned int)access_mask,
99                         smb_fname_str_dbg(smb_fname),
100                         (unsigned int)rejected_share_access ));
101                 return NT_STATUS_ACCESS_DENIED;
102         }
103
104         if (!use_privs && get_current_uid(conn) == (uid_t)0) {
105                 /* I'm sorry sir, I didn't know you were root... */
106                 DEBUG(10,("smbd_check_access_rights: root override "
107                         "on %s. Granting 0x%x\n",
108                         smb_fname_str_dbg(smb_fname),
109                         (unsigned int)access_mask ));
110                 return NT_STATUS_OK;
111         }
112
113         if ((access_mask & DELETE_ACCESS) && !lp_acl_check_permissions(SNUM(conn))) {
114                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
115                         "on DELETE_ACCESS on file %s. Granting 0x%x\n",
116                         smb_fname_str_dbg(smb_fname),
117                         (unsigned int)access_mask ));
118                 return NT_STATUS_OK;
119         }
120
121         if (access_mask == DELETE_ACCESS &&
122                         VALID_STAT(smb_fname->st) &&
123                         S_ISLNK(smb_fname->st.st_ex_mode)) {
124                 /* We can always delete a symlink. */
125                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
126                         "on DELETE_ACCESS on symlink %s.\n",
127                         smb_fname_str_dbg(smb_fname) ));
128                 return NT_STATUS_OK;
129         }
130
131         status = SMB_VFS_GET_NT_ACL(conn, smb_fname,
132                         (SECINFO_OWNER |
133                         SECINFO_GROUP |
134                          SECINFO_DACL), talloc_tos(), &sd);
135
136         if (!NT_STATUS_IS_OK(status)) {
137                 DEBUG(10, ("smbd_check_access_rights: Could not get acl "
138                         "on %s: %s\n",
139                         smb_fname_str_dbg(smb_fname),
140                         nt_errstr(status)));
141
142                 if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
143                         goto access_denied;
144                 }
145
146                 return status;
147         }
148
149         /*
150          * If we can access the path to this file, by
151          * default we have FILE_READ_ATTRIBUTES from the
152          * containing directory. See the section:
153          * "Algorithm to Check Access to an Existing File"
154          * in MS-FSA.pdf.
155          *
156          * se_file_access_check() also takes care of
157          * owner WRITE_DAC and READ_CONTROL.
158          */
159         do_not_check_mask = FILE_READ_ATTRIBUTES;
160
161         /*
162          * Samba 3.6 and earlier granted execute access even
163          * if the ACL did not contain execute rights.
164          * Samba 4.0 is more correct and checks it.
165          * The compatibilty mode allows one to skip this check
166          * to smoothen upgrades.
167          */
168         if (lp_acl_allow_execute_always(SNUM(conn))) {
169                 do_not_check_mask |= FILE_EXECUTE;
170         }
171
172         status = se_file_access_check(sd,
173                                 get_current_nttok(conn),
174                                 use_privs,
175                                 (access_mask & ~do_not_check_mask),
176                                 &rejected_mask);
177
178         DEBUG(10,("smbd_check_access_rights: file %s requesting "
179                 "0x%x returning 0x%x (%s)\n",
180                 smb_fname_str_dbg(smb_fname),
181                 (unsigned int)access_mask,
182                 (unsigned int)rejected_mask,
183                 nt_errstr(status) ));
184
185         if (!NT_STATUS_IS_OK(status)) {
186                 if (DEBUGLEVEL >= 10) {
187                         DEBUG(10,("smbd_check_access_rights: acl for %s is:\n",
188                                 smb_fname_str_dbg(smb_fname) ));
189                         NDR_PRINT_DEBUG(security_descriptor, sd);
190                 }
191         }
192
193         TALLOC_FREE(sd);
194
195         if (NT_STATUS_IS_OK(status) ||
196                         !NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
197                 return status;
198         }
199
200         /* Here we know status == NT_STATUS_ACCESS_DENIED. */
201
202   access_denied:
203
204         if ((access_mask & FILE_WRITE_ATTRIBUTES) &&
205                         (rejected_mask & FILE_WRITE_ATTRIBUTES) &&
206                         !lp_store_dos_attributes(SNUM(conn)) &&
207                         (lp_map_readonly(SNUM(conn)) ||
208                         lp_map_archive(SNUM(conn)) ||
209                         lp_map_hidden(SNUM(conn)) ||
210                         lp_map_system(SNUM(conn)))) {
211                 rejected_mask &= ~FILE_WRITE_ATTRIBUTES;
212
213                 DEBUG(10,("smbd_check_access_rights: "
214                         "overrode "
215                         "FILE_WRITE_ATTRIBUTES "
216                         "on file %s\n",
217                         smb_fname_str_dbg(smb_fname)));
218         }
219
220         if (parent_override_delete(conn,
221                                 smb_fname,
222                                 access_mask,
223                                 rejected_mask)) {
224                 /* Were we trying to do an open
225                  * for delete and didn't get DELETE
226                  * access (only) ? Check if the
227                  * directory allows DELETE_CHILD.
228                  * See here:
229                  * http://blogs.msdn.com/oldnewthing/archive/2004/06/04/148426.aspx
230                  * for details. */
231
232                 rejected_mask &= ~DELETE_ACCESS;
233
234                 DEBUG(10,("smbd_check_access_rights: "
235                         "overrode "
236                         "DELETE_ACCESS on "
237                         "file %s\n",
238                         smb_fname_str_dbg(smb_fname)));
239         }
240
241         if (rejected_mask != 0) {
242                 return NT_STATUS_ACCESS_DENIED;
243         }
244         return NT_STATUS_OK;
245 }
246
247 NTSTATUS check_parent_access(struct connection_struct *conn,
248                                 struct smb_filename *smb_fname,
249                                 uint32_t access_mask)
250 {
251         NTSTATUS status;
252         char *parent_dir = NULL;
253         struct security_descriptor *parent_sd = NULL;
254         uint32_t access_granted = 0;
255         struct smb_filename *parent_smb_fname = NULL;
256         struct share_mode_lock *lck = NULL;
257         struct file_id id = {0};
258         uint32_t name_hash;
259         bool delete_on_close_set;
260         int ret;
261         TALLOC_CTX *frame = talloc_stackframe();
262
263         if (!parent_dirname(frame,
264                                 smb_fname->base_name,
265                                 &parent_dir,
266                                 NULL)) {
267                 status = NT_STATUS_NO_MEMORY;
268                 goto out;
269         }
270
271         parent_smb_fname = synthetic_smb_fname(frame,
272                                 parent_dir,
273                                 NULL,
274                                 NULL,
275                                 smb_fname->flags);
276         if (parent_smb_fname == NULL) {
277                 status = NT_STATUS_NO_MEMORY;
278                 goto out;
279         }
280
281         if (get_current_uid(conn) == (uid_t)0) {
282                 /* I'm sorry sir, I didn't know you were root... */
283                 DEBUG(10,("check_parent_access: root override "
284                         "on %s. Granting 0x%x\n",
285                         smb_fname_str_dbg(smb_fname),
286                         (unsigned int)access_mask ));
287                 status = NT_STATUS_OK;
288                 goto out;
289         }
290
291         status = SMB_VFS_GET_NT_ACL(conn,
292                                 parent_smb_fname,
293                                 SECINFO_DACL,
294                                 frame,
295                                 &parent_sd);
296
297         if (!NT_STATUS_IS_OK(status)) {
298                 DEBUG(5,("check_parent_access: SMB_VFS_GET_NT_ACL failed for "
299                         "%s with error %s\n",
300                         parent_dir,
301                         nt_errstr(status)));
302                 goto out;
303         }
304
305         /*
306          * If we can access the path to this file, by
307          * default we have FILE_READ_ATTRIBUTES from the
308          * containing directory. See the section:
309          * "Algorithm to Check Access to an Existing File"
310          * in MS-FSA.pdf.
311          *
312          * se_file_access_check() also takes care of
313          * owner WRITE_DAC and READ_CONTROL.
314          */
315         status = se_file_access_check(parent_sd,
316                                 get_current_nttok(conn),
317                                 false,
318                                 (access_mask & ~FILE_READ_ATTRIBUTES),
319                                 &access_granted);
320         if(!NT_STATUS_IS_OK(status)) {
321                 DEBUG(5,("check_parent_access: access check "
322                         "on directory %s for "
323                         "path %s for mask 0x%x returned (0x%x) %s\n",
324                         parent_dir,
325                         smb_fname->base_name,
326                         access_mask,
327                         access_granted,
328                         nt_errstr(status) ));
329                 goto out;
330         }
331
332         if (!(access_mask & (SEC_DIR_ADD_FILE | SEC_DIR_ADD_SUBDIR))) {
333                 status = NT_STATUS_OK;
334                 goto out;
335         }
336         if (!lp_check_parent_directory_delete_on_close(SNUM(conn))) {
337                 status = NT_STATUS_OK;
338                 goto out;
339         }
340
341         /* Check if the directory has delete-on-close set */
342         ret = SMB_VFS_STAT(conn, parent_smb_fname);
343         if (ret != 0) {
344                 status = map_nt_error_from_unix(errno);
345                 goto out;
346         }
347
348         id = SMB_VFS_FILE_ID_CREATE(conn, &parent_smb_fname->st);
349
350         status = file_name_hash(conn, parent_smb_fname->base_name, &name_hash);
351         if (!NT_STATUS_IS_OK(status)) {
352                 goto out;
353         }
354
355         lck = get_existing_share_mode_lock(frame, id);
356         if (lck == NULL) {
357                 status = NT_STATUS_OK;
358                 goto out;
359         }
360
361         delete_on_close_set = is_delete_on_close_set(lck, name_hash);
362         if (delete_on_close_set) {
363                 status = NT_STATUS_DELETE_PENDING;
364                 goto out;
365         }
366
367         status = NT_STATUS_OK;
368
369 out:
370         TALLOC_FREE(frame);
371         return status;
372 }
373
374 /****************************************************************************
375  Ensure when opening a base file for a stream open that we have permissions
376  to do so given the access mask on the base file.
377 ****************************************************************************/
378
379 static NTSTATUS check_base_file_access(struct connection_struct *conn,
380                                 struct smb_filename *smb_fname,
381                                 uint32_t access_mask)
382 {
383         NTSTATUS status;
384
385         status = smbd_calculate_access_mask(conn, smb_fname,
386                                         false,
387                                         access_mask,
388                                         &access_mask);
389         if (!NT_STATUS_IS_OK(status)) {
390                 DEBUG(10, ("smbd_calculate_access_mask "
391                         "on file %s returned %s\n",
392                         smb_fname_str_dbg(smb_fname),
393                         nt_errstr(status)));
394                 return status;
395         }
396
397         if (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA)) {
398                 uint32_t dosattrs;
399                 if (!CAN_WRITE(conn)) {
400                         return NT_STATUS_ACCESS_DENIED;
401                 }
402                 dosattrs = dos_mode(conn, smb_fname);
403                 if (IS_DOS_READONLY(dosattrs)) {
404                         return NT_STATUS_ACCESS_DENIED;
405                 }
406         }
407
408         return smbd_check_access_rights(conn,
409                                         smb_fname,
410                                         false,
411                                         access_mask);
412 }
413
414 /****************************************************************************
415  Handle differing symlink errno's
416 ****************************************************************************/
417
418 static int link_errno_convert(int err)
419 {
420 #if defined(ENOTSUP) && defined(OSF1)
421         /* handle special Tru64 errno */
422         if (err == ENOTSUP) {
423                 err = ELOOP;
424         }
425 #endif /* ENOTSUP */
426 #ifdef EFTYPE
427         /* fix broken NetBSD errno */
428         if (err == EFTYPE) {
429                 err = ELOOP;
430         }
431 #endif /* EFTYPE */
432         /* fix broken FreeBSD errno */
433         if (err == EMLINK) {
434                 err = ELOOP;
435         }
436         return err;
437 }
438
439 static int non_widelink_open(struct connection_struct *conn,
440                         const struct smb_filename *conn_rootdir_fname,
441                         files_struct *fsp,
442                         struct smb_filename *smb_fname,
443                         int flags,
444                         mode_t mode,
445                         unsigned int link_depth);
446
447 /****************************************************************************
448  Follow a symlink in userspace.
449 ****************************************************************************/
450
451 static int process_symlink_open(struct connection_struct *conn,
452                         const struct smb_filename *conn_rootdir_fname,
453                         files_struct *fsp,
454                         struct smb_filename *smb_fname,
455                         int flags,
456                         mode_t mode,
457                         unsigned int link_depth)
458 {
459         int fd = -1;
460         char *link_target = NULL;
461         struct smb_filename target_fname = {0};
462         int link_len = -1;
463         struct smb_filename *oldwd_fname = NULL;
464         size_t rootdir_len = 0;
465         struct smb_filename *resolved_fname = NULL;
466         char *resolved_name = NULL;
467         bool matched = false;
468         int saved_errno = 0;
469
470         /*
471          * Ensure we don't get stuck in a symlink loop.
472          */
473         link_depth++;
474         if (link_depth >= 20) {
475                 errno = ELOOP;
476                 goto out;
477         }
478
479         /* Allocate space for the link target. */
480         link_target = talloc_array(talloc_tos(), char, PATH_MAX);
481         if (link_target == NULL) {
482                 errno = ENOMEM;
483                 goto out;
484         }
485
486         /* Read the link target. */
487         link_len = SMB_VFS_READLINK(conn,
488                                 smb_fname,
489                                 link_target,
490                                 PATH_MAX - 1);
491         if (link_len == -1) {
492                 goto out;
493         }
494
495         /* Ensure it's at least null terminated. */
496         link_target[link_len] = '\0';
497         target_fname = (struct smb_filename){ .base_name = link_target };
498
499         /* Convert to an absolute path. */
500         resolved_fname = SMB_VFS_REALPATH(conn, talloc_tos(), &target_fname);
501         if (resolved_fname == NULL) {
502                 goto out;
503         }
504         resolved_name = resolved_fname->base_name;
505
506         /*
507          * We know conn_rootdir starts with '/' and
508          * does not end in '/'. FIXME ! Should we
509          * smb_assert this ?
510          */
511         rootdir_len = strlen(conn_rootdir_fname->base_name);
512
513         matched = (strncmp(conn_rootdir_fname->base_name,
514                                 resolved_name,
515                                 rootdir_len) == 0);
516         if (!matched) {
517                 errno = EACCES;
518                 goto out;
519         }
520
521         /*
522          * Turn into a path relative to the share root.
523          */
524         if (resolved_name[rootdir_len] == '\0') {
525                 /* Link to the root of the share. */
526                 TALLOC_FREE(smb_fname->base_name);
527                 smb_fname->base_name = talloc_strdup(smb_fname, ".");
528         } else if (resolved_name[rootdir_len] == '/') {
529                 TALLOC_FREE(smb_fname->base_name);
530                 smb_fname->base_name = talloc_strdup(smb_fname,
531                                         &resolved_name[rootdir_len+1]);
532         } else {
533                 errno = EACCES;
534                 goto out;
535         }
536
537         if (smb_fname->base_name == NULL) {
538                 errno = ENOMEM;
539                 goto out;
540         }
541
542         oldwd_fname = vfs_GetWd(talloc_tos(), conn);
543         if (oldwd_fname == NULL) {
544                 goto out;
545         }
546
547         /* Ensure we operate from the root of the share. */
548         if (vfs_ChDir(conn, conn_rootdir_fname) == -1) {
549                 goto out;
550         }
551
552         /* And do it all again.. */
553         fd = non_widelink_open(conn,
554                                 conn_rootdir_fname,
555                                 fsp,
556                                 smb_fname,
557                                 flags,
558                                 mode,
559                                 link_depth);
560         if (fd == -1) {
561                 saved_errno = errno;
562         }
563
564   out:
565
566         TALLOC_FREE(resolved_fname);
567         TALLOC_FREE(link_target);
568         if (oldwd_fname != NULL) {
569                 int ret = vfs_ChDir(conn, oldwd_fname);
570                 if (ret == -1) {
571                         smb_panic("unable to get back to old directory\n");
572                 }
573                 TALLOC_FREE(oldwd_fname);
574         }
575         if (saved_errno != 0) {
576                 errno = saved_errno;
577         }
578         return fd;
579 }
580
581 /****************************************************************************
582  Non-widelink open.
583 ****************************************************************************/
584
585 static int non_widelink_open(struct connection_struct *conn,
586                         const struct smb_filename *conn_rootdir_fname,
587                         files_struct *fsp,
588                         struct smb_filename *smb_fname,
589                         int flags,
590                         mode_t mode,
591                         unsigned int link_depth)
592 {
593         NTSTATUS status;
594         int fd = -1;
595         struct smb_filename *smb_fname_rel = NULL;
596         int saved_errno = 0;
597         struct smb_filename *oldwd_fname = NULL;
598         char *parent_dir = NULL;
599         struct smb_filename parent_dir_fname = {0};
600         const char *final_component = NULL;
601         bool is_directory = false;
602         bool ok;
603
604 #ifdef O_DIRECTORY
605         if (flags & O_DIRECTORY) {
606                 is_directory = true;
607         }
608 #endif
609
610         if (is_directory) {
611                 parent_dir = talloc_strdup(talloc_tos(), smb_fname->base_name);
612                 if (parent_dir == NULL) {
613                         saved_errno = errno;
614                         goto out;
615                 }
616
617                 final_component = ".";
618         } else {
619                 ok = parent_dirname(talloc_tos(),
620                                     smb_fname->base_name,
621                                     &parent_dir,
622                                     &final_component);
623                 if (!ok) {
624                         saved_errno = errno;
625                         goto out;
626                 }
627         }
628
629         parent_dir_fname = (struct smb_filename) { .base_name = parent_dir };
630
631         oldwd_fname = vfs_GetWd(talloc_tos(), conn);
632         if (oldwd_fname == NULL) {
633                 goto out;
634         }
635
636         /* Pin parent directory in place. */
637         if (vfs_ChDir(conn, &parent_dir_fname) == -1) {
638                 goto out;
639         }
640
641         smb_fname_rel = synthetic_smb_fname(talloc_tos(),
642                                 final_component,
643                                 smb_fname->stream_name,
644                                 &smb_fname->st,
645                                 smb_fname->flags);
646         if (smb_fname_rel == NULL) {
647                 saved_errno = ENOMEM;
648                 goto out;
649         }
650
651         /* Ensure the relative path is below the share. */
652         status = check_reduced_name(conn, &parent_dir_fname, smb_fname_rel);
653         if (!NT_STATUS_IS_OK(status)) {
654                 saved_errno = map_errno_from_nt_status(status);
655                 goto out;
656         }
657
658         flags |= O_NOFOLLOW;
659
660         {
661                 struct smb_filename *tmp_name = fsp->fsp_name;
662                 fsp->fsp_name = smb_fname_rel;
663                 fd = SMB_VFS_OPEN(conn, smb_fname_rel, fsp, flags, mode);
664                 fsp->fsp_name = tmp_name;
665         }
666
667         if (fd == -1) {
668                 saved_errno = link_errno_convert(errno);
669                 /*
670                  * Trying to open a symlink to a directory with O_NOFOLLOW and
671                  * O_DIRECTORY can return either of ELOOP and ENOTDIR. So
672                  * ENOTDIR really means: might be a symlink, but we're not sure.
673                  * In this case, we just assume there's a symlink. If we were
674                  * wrong, process_symlink_open() will return EINVAL. We check
675                  * this below, and fall back to returning the initial
676                  * saved_errno.
677                  *
678                  * BUG: https://bugzilla.samba.org/show_bug.cgi?id=12860
679                  */
680                 if (saved_errno == ELOOP || saved_errno == ENOTDIR) {
681                         if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
682                                 /* Never follow symlinks on posix open. */
683                                 goto out;
684                         }
685                         if (!lp_follow_symlinks(SNUM(conn))) {
686                                 /* Explicitly no symlinks. */
687                                 goto out;
688                         }
689                         /*
690                          * We may have a symlink. Follow in userspace
691                          * to ensure it's under the share definition.
692                          */
693                         fd = process_symlink_open(conn,
694                                         conn_rootdir_fname,
695                                         fsp,
696                                         smb_fname_rel,
697                                         flags,
698                                         mode,
699                                         link_depth);
700                         if (fd == -1) {
701                                 if (saved_errno == ENOTDIR &&
702                                                 errno == EINVAL) {
703                                         /*
704                                          * O_DIRECTORY on neither a directory,
705                                          * nor a symlink. Just return
706                                          * saved_errno from initial open()
707                                          */
708                                         goto out;
709                                 }
710                                 saved_errno =
711                                         link_errno_convert(errno);
712                         }
713                 }
714         }
715
716   out:
717
718         TALLOC_FREE(parent_dir);
719         TALLOC_FREE(smb_fname_rel);
720
721         if (oldwd_fname != NULL) {
722                 int ret = vfs_ChDir(conn, oldwd_fname);
723                 if (ret == -1) {
724                         smb_panic("unable to get back to old directory\n");
725                 }
726                 TALLOC_FREE(oldwd_fname);
727         }
728         if (saved_errno != 0) {
729                 errno = saved_errno;
730         }
731         return fd;
732 }
733
734 /****************************************************************************
735  fd support routines - attempt to do a dos_open.
736 ****************************************************************************/
737
738 NTSTATUS fd_open(struct connection_struct *conn,
739                  files_struct *fsp,
740                  int flags,
741                  mode_t mode)
742 {
743         struct smb_filename *smb_fname = fsp->fsp_name;
744         NTSTATUS status = NT_STATUS_OK;
745
746         /*
747          * Never follow symlinks on a POSIX client. The
748          * client should be doing this.
749          */
750
751         if ((fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) || !lp_follow_symlinks(SNUM(conn))) {
752                 flags |= O_NOFOLLOW;
753         }
754
755         /* Ensure path is below share definition. */
756         if (!lp_widelinks(SNUM(conn))) {
757                 struct smb_filename *conn_rootdir_fname = NULL;
758                 const char *conn_rootdir = SMB_VFS_CONNECTPATH(conn,
759                                                 smb_fname);
760                 int saved_errno = 0;
761
762                 if (conn_rootdir == NULL) {
763                         return NT_STATUS_NO_MEMORY;
764                 }
765                 conn_rootdir_fname = synthetic_smb_fname(talloc_tos(),
766                                                 conn_rootdir,
767                                                 NULL,
768                                                 NULL,
769                                                 0);
770                 if (conn_rootdir_fname == NULL) {
771                         return NT_STATUS_NO_MEMORY;
772                 }
773
774                 /*
775                  * Only follow symlinks within a share
776                  * definition.
777                  */
778                 fsp->fh->fd = non_widelink_open(conn,
779                                         conn_rootdir_fname,
780                                         fsp,
781                                         smb_fname,
782                                         flags,
783                                         mode,
784                                         0);
785                 if (fsp->fh->fd == -1) {
786                         saved_errno = errno;
787                 }
788                 TALLOC_FREE(conn_rootdir_fname);
789                 if (saved_errno != 0) {
790                         errno = saved_errno;
791                 }
792         } else {
793                 fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, flags, mode);
794         }
795
796         if (fsp->fh->fd == -1) {
797                 int posix_errno = link_errno_convert(errno);
798                 status = map_nt_error_from_unix(posix_errno);
799                 if (errno == EMFILE) {
800                         static time_t last_warned = 0L;
801
802                         if (time((time_t *) NULL) > last_warned) {
803                                 DEBUG(0,("Too many open files, unable "
804                                         "to open more!  smbd's max "
805                                         "open files = %d\n",
806                                         lp_max_open_files()));
807                                 last_warned = time((time_t *) NULL);
808                         }
809                 }
810
811         }
812
813         DEBUG(10,("fd_open: name %s, flags = 0%o mode = 0%o, fd = %d. %s\n",
814                   smb_fname_str_dbg(smb_fname), flags, (int)mode, fsp->fh->fd,
815                 (fsp->fh->fd == -1) ? strerror(errno) : "" ));
816
817         return status;
818 }
819
820 /****************************************************************************
821  Close the file associated with a fsp.
822 ****************************************************************************/
823
824 NTSTATUS fd_close(files_struct *fsp)
825 {
826         int ret;
827
828         if (fsp->dptr) {
829                 dptr_CloseDir(fsp);
830         }
831         if (fsp->fh->fd == -1) {
832                 return NT_STATUS_OK; /* What we used to call a stat open. */
833         }
834         if (fsp->fh->ref_count > 1) {
835                 return NT_STATUS_OK; /* Shared handle. Only close last reference. */
836         }
837
838         ret = SMB_VFS_CLOSE(fsp);
839         fsp->fh->fd = -1;
840         if (ret == -1) {
841                 return map_nt_error_from_unix(errno);
842         }
843         return NT_STATUS_OK;
844 }
845
846 /****************************************************************************
847  Change the ownership of a file to that of the parent directory.
848  Do this by fd if possible.
849 ****************************************************************************/
850
851 void change_file_owner_to_parent(connection_struct *conn,
852                                         const char *inherit_from_dir,
853                                         files_struct *fsp)
854 {
855         struct smb_filename *smb_fname_parent;
856         int ret;
857
858         smb_fname_parent = synthetic_smb_fname(talloc_tos(),
859                                         inherit_from_dir,
860                                         NULL,
861                                         NULL,
862                                         0);
863         if (smb_fname_parent == NULL) {
864                 return;
865         }
866
867         ret = SMB_VFS_STAT(conn, smb_fname_parent);
868         if (ret == -1) {
869                 DEBUG(0,("change_file_owner_to_parent: failed to stat parent "
870                          "directory %s. Error was %s\n",
871                          smb_fname_str_dbg(smb_fname_parent),
872                          strerror(errno)));
873                 TALLOC_FREE(smb_fname_parent);
874                 return;
875         }
876
877         if (smb_fname_parent->st.st_ex_uid == fsp->fsp_name->st.st_ex_uid) {
878                 /* Already this uid - no need to change. */
879                 DEBUG(10,("change_file_owner_to_parent: file %s "
880                         "is already owned by uid %d\n",
881                         fsp_str_dbg(fsp),
882                         (int)fsp->fsp_name->st.st_ex_uid ));
883                 TALLOC_FREE(smb_fname_parent);
884                 return;
885         }
886
887         become_root();
888         ret = SMB_VFS_FCHOWN(fsp, smb_fname_parent->st.st_ex_uid, (gid_t)-1);
889         unbecome_root();
890         if (ret == -1) {
891                 DEBUG(0,("change_file_owner_to_parent: failed to fchown "
892                          "file %s to parent directory uid %u. Error "
893                          "was %s\n", fsp_str_dbg(fsp),
894                          (unsigned int)smb_fname_parent->st.st_ex_uid,
895                          strerror(errno) ));
896         } else {
897                 DEBUG(10,("change_file_owner_to_parent: changed new file %s to "
898                         "parent directory uid %u.\n", fsp_str_dbg(fsp),
899                         (unsigned int)smb_fname_parent->st.st_ex_uid));
900                 /* Ensure the uid entry is updated. */
901                 fsp->fsp_name->st.st_ex_uid = smb_fname_parent->st.st_ex_uid;
902         }
903
904         TALLOC_FREE(smb_fname_parent);
905 }
906
907 static NTSTATUS change_dir_owner_to_parent(connection_struct *conn,
908                                         const char *inherit_from_dir,
909                                         struct smb_filename *smb_dname,
910                                         SMB_STRUCT_STAT *psbuf)
911 {
912         struct smb_filename *smb_fname_parent;
913         struct smb_filename *smb_fname_cwd = NULL;
914         struct smb_filename *saved_dir_fname = NULL;
915         TALLOC_CTX *ctx = talloc_tos();
916         NTSTATUS status = NT_STATUS_OK;
917         int ret;
918
919         smb_fname_parent = synthetic_smb_fname(ctx,
920                                         inherit_from_dir,
921                                         NULL,
922                                         NULL,
923                                         0);
924         if (smb_fname_parent == NULL) {
925                 return NT_STATUS_NO_MEMORY;
926         }
927
928         ret = SMB_VFS_STAT(conn, smb_fname_parent);
929         if (ret == -1) {
930                 status = map_nt_error_from_unix(errno);
931                 DEBUG(0,("change_dir_owner_to_parent: failed to stat parent "
932                          "directory %s. Error was %s\n",
933                          smb_fname_str_dbg(smb_fname_parent),
934                          strerror(errno)));
935                 goto out;
936         }
937
938         /* We've already done an lstat into psbuf, and we know it's a
939            directory. If we can cd into the directory and the dev/ino
940            are the same then we can safely chown without races as
941            we're locking the directory in place by being in it.  This
942            should work on any UNIX (thanks tridge :-). JRA.
943         */
944
945         saved_dir_fname = vfs_GetWd(ctx,conn);
946         if (!saved_dir_fname) {
947                 status = map_nt_error_from_unix(errno);
948                 DEBUG(0,("change_dir_owner_to_parent: failed to get "
949                          "current working directory. Error was %s\n",
950                          strerror(errno)));
951                 goto out;
952         }
953
954         /* Chdir into the new path. */
955         if (vfs_ChDir(conn, smb_dname) == -1) {
956                 status = map_nt_error_from_unix(errno);
957                 DEBUG(0,("change_dir_owner_to_parent: failed to change "
958                          "current working directory to %s. Error "
959                          "was %s\n", smb_dname->base_name, strerror(errno) ));
960                 goto chdir;
961         }
962
963         smb_fname_cwd = synthetic_smb_fname(ctx, ".", NULL, NULL, 0);
964         if (smb_fname_cwd == NULL) {
965                 status = NT_STATUS_NO_MEMORY;
966                 goto chdir;
967         }
968
969         ret = SMB_VFS_STAT(conn, smb_fname_cwd);
970         if (ret == -1) {
971                 status = map_nt_error_from_unix(errno);
972                 DEBUG(0,("change_dir_owner_to_parent: failed to stat "
973                          "directory '.' (%s) Error was %s\n",
974                          smb_dname->base_name, strerror(errno)));
975                 goto chdir;
976         }
977
978         /* Ensure we're pointing at the same place. */
979         if (smb_fname_cwd->st.st_ex_dev != psbuf->st_ex_dev ||
980             smb_fname_cwd->st.st_ex_ino != psbuf->st_ex_ino) {
981                 DEBUG(0,("change_dir_owner_to_parent: "
982                          "device/inode on directory %s changed. "
983                          "Refusing to chown !\n",
984                         smb_dname->base_name ));
985                 status = NT_STATUS_ACCESS_DENIED;
986                 goto chdir;
987         }
988
989         if (smb_fname_parent->st.st_ex_uid == smb_fname_cwd->st.st_ex_uid) {
990                 /* Already this uid - no need to change. */
991                 DEBUG(10,("change_dir_owner_to_parent: directory %s "
992                         "is already owned by uid %d\n",
993                         smb_dname->base_name,
994                         (int)smb_fname_cwd->st.st_ex_uid ));
995                 status = NT_STATUS_OK;
996                 goto chdir;
997         }
998
999         become_root();
1000         ret = SMB_VFS_LCHOWN(conn,
1001                         smb_fname_cwd,
1002                         smb_fname_parent->st.st_ex_uid,
1003                         (gid_t)-1);
1004         unbecome_root();
1005         if (ret == -1) {
1006                 status = map_nt_error_from_unix(errno);
1007                 DEBUG(10,("change_dir_owner_to_parent: failed to chown "
1008                           "directory %s to parent directory uid %u. "
1009                           "Error was %s\n",
1010                           smb_dname->base_name,
1011                           (unsigned int)smb_fname_parent->st.st_ex_uid,
1012                           strerror(errno) ));
1013         } else {
1014                 DEBUG(10,("change_dir_owner_to_parent: changed ownership of new "
1015                         "directory %s to parent directory uid %u.\n",
1016                         smb_dname->base_name,
1017                         (unsigned int)smb_fname_parent->st.st_ex_uid ));
1018                 /* Ensure the uid entry is updated. */
1019                 psbuf->st_ex_uid = smb_fname_parent->st.st_ex_uid;
1020         }
1021
1022  chdir:
1023         vfs_ChDir(conn, saved_dir_fname);
1024  out:
1025         TALLOC_FREE(saved_dir_fname);
1026         TALLOC_FREE(smb_fname_parent);
1027         TALLOC_FREE(smb_fname_cwd);
1028         return status;
1029 }
1030
1031 /****************************************************************************
1032  Open a file - returning a guaranteed ATOMIC indication of if the
1033  file was created or not.
1034 ****************************************************************************/
1035
1036 static NTSTATUS fd_open_atomic(struct connection_struct *conn,
1037                         files_struct *fsp,
1038                         int flags,
1039                         mode_t mode,
1040                         bool *file_created)
1041 {
1042         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
1043         NTSTATUS retry_status;
1044         bool file_existed = VALID_STAT(fsp->fsp_name->st);
1045         int curr_flags;
1046
1047         *file_created = false;
1048
1049         if (!(flags & O_CREAT)) {
1050                 /*
1051                  * We're not creating the file, just pass through.
1052                  */
1053                 return fd_open(conn, fsp, flags, mode);
1054         }
1055
1056         if (flags & O_EXCL) {
1057                 /*
1058                  * Fail if already exists, just pass through.
1059                  */
1060                 status = fd_open(conn, fsp, flags, mode);
1061
1062                 /*
1063                  * Here we've opened with O_CREAT|O_EXCL. If that went
1064                  * NT_STATUS_OK, we *know* we created this file.
1065                  */
1066                 *file_created = NT_STATUS_IS_OK(status);
1067
1068                 return status;
1069         }
1070
1071         /*
1072          * Now it gets tricky. We have O_CREAT, but not O_EXCL.
1073          * To know absolutely if we created the file or not,
1074          * we can never call O_CREAT without O_EXCL. So if
1075          * we think the file existed, try without O_CREAT|O_EXCL.
1076          * If we think the file didn't exist, try with
1077          * O_CREAT|O_EXCL.
1078          *
1079          * The big problem here is dangling symlinks. Opening
1080          * without O_NOFOLLOW means both bad symlink
1081          * and missing path return -1, ENOENT from open(). As POSIX
1082          * is pathname based it's not possible to tell
1083          * the difference between these two cases in a
1084          * non-racy way, so change to try only two attempts before
1085          * giving up.
1086          *
1087          * We don't have this problem for the O_NOFOLLOW
1088          * case as it just returns NT_STATUS_OBJECT_PATH_NOT_FOUND
1089          * mapped from the ELOOP POSIX error.
1090          */
1091
1092         curr_flags = flags;
1093
1094         if (file_existed) {
1095                 curr_flags &= ~(O_CREAT);
1096                 retry_status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
1097         } else {
1098                 curr_flags |= O_EXCL;
1099                 retry_status = NT_STATUS_OBJECT_NAME_COLLISION;
1100         }
1101
1102         status = fd_open(conn, fsp, curr_flags, mode);
1103         if (NT_STATUS_IS_OK(status)) {
1104                 if (!file_existed) {
1105                         *file_created = true;
1106                 }
1107                 return NT_STATUS_OK;
1108         }
1109         if (!NT_STATUS_EQUAL(status, retry_status)) {
1110                 return status;
1111         }
1112
1113         curr_flags = flags;
1114
1115         /*
1116          * Keep file_existed up to date for clarity.
1117          */
1118         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1119                 file_existed = false;
1120                 curr_flags |= O_EXCL;
1121                 DBG_DEBUG("file %s did not exist. Retry.\n",
1122                         smb_fname_str_dbg(fsp->fsp_name));
1123         } else {
1124                 file_existed = true;
1125                 curr_flags &= ~(O_CREAT);
1126                 DBG_DEBUG("file %s existed. Retry.\n",
1127                         smb_fname_str_dbg(fsp->fsp_name));
1128         }
1129
1130         status = fd_open(conn, fsp, curr_flags, mode);
1131
1132         if (NT_STATUS_IS_OK(status) && (!file_existed)) {
1133                 *file_created = true;
1134         }
1135
1136         return status;
1137 }
1138
1139 /****************************************************************************
1140  Open a file.
1141 ****************************************************************************/
1142
1143 static NTSTATUS open_file(files_struct *fsp,
1144                           connection_struct *conn,
1145                           struct smb_request *req,
1146                           const char *parent_dir,
1147                           int flags,
1148                           mode_t unx_mode,
1149                           uint32_t access_mask, /* client requested access mask. */
1150                           uint32_t open_access_mask, /* what we're actually using in the open. */
1151                           bool *p_file_created)
1152 {
1153         struct smb_filename *smb_fname = fsp->fsp_name;
1154         NTSTATUS status = NT_STATUS_OK;
1155         int accmode = (flags & O_ACCMODE);
1156         int local_flags = flags;
1157         bool file_existed = VALID_STAT(fsp->fsp_name->st);
1158
1159         fsp->fh->fd = -1;
1160         errno = EPERM;
1161
1162         /* Check permissions */
1163
1164         /*
1165          * This code was changed after seeing a client open request 
1166          * containing the open mode of (DENY_WRITE/read-only) with
1167          * the 'create if not exist' bit set. The previous code
1168          * would fail to open the file read only on a read-only share
1169          * as it was checking the flags parameter  directly against O_RDONLY,
1170          * this was failing as the flags parameter was set to O_RDONLY|O_CREAT.
1171          * JRA.
1172          */
1173
1174         if (!CAN_WRITE(conn)) {
1175                 /* It's a read-only share - fail if we wanted to write. */
1176                 if(accmode != O_RDONLY || (flags & O_TRUNC) || (flags & O_APPEND)) {
1177                         DEBUG(3,("Permission denied opening %s\n",
1178                                  smb_fname_str_dbg(smb_fname)));
1179                         return NT_STATUS_ACCESS_DENIED;
1180                 }
1181                 if (flags & O_CREAT) {
1182                         /* We don't want to write - but we must make sure that
1183                            O_CREAT doesn't create the file if we have write
1184                            access into the directory.
1185                         */
1186                         flags &= ~(O_CREAT|O_EXCL);
1187                         local_flags &= ~(O_CREAT|O_EXCL);
1188                 }
1189         }
1190
1191         /*
1192          * This little piece of insanity is inspired by the
1193          * fact that an NT client can open a file for O_RDONLY,
1194          * but set the create disposition to FILE_EXISTS_TRUNCATE.
1195          * If the client *can* write to the file, then it expects to
1196          * truncate the file, even though it is opening for readonly.
1197          * Quicken uses this stupid trick in backup file creation...
1198          * Thanks *greatly* to "David W. Chapman Jr." <dwcjr@inethouston.net>
1199          * for helping track this one down. It didn't bite us in 2.0.x
1200          * as we always opened files read-write in that release. JRA.
1201          */
1202
1203         if ((accmode == O_RDONLY) && ((flags & O_TRUNC) == O_TRUNC)) {
1204                 DEBUG(10,("open_file: truncate requested on read-only open "
1205                           "for file %s\n", smb_fname_str_dbg(smb_fname)));
1206                 local_flags = (flags & ~O_ACCMODE)|O_RDWR;
1207         }
1208
1209         if ((open_access_mask & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) ||
1210             (!file_existed && (local_flags & O_CREAT)) ||
1211             ((local_flags & O_TRUNC) == O_TRUNC) ) {
1212                 const char *wild;
1213                 int ret;
1214
1215 #if defined(O_NONBLOCK) && defined(S_ISFIFO)
1216                 /*
1217                  * We would block on opening a FIFO with no one else on the
1218                  * other end. Do what we used to do and add O_NONBLOCK to the
1219                  * open flags. JRA.
1220                  */
1221
1222                 if (file_existed && S_ISFIFO(smb_fname->st.st_ex_mode)) {
1223                         local_flags &= ~O_TRUNC; /* Can't truncate a FIFO. */
1224                         local_flags |= O_NONBLOCK;
1225                 }
1226 #endif
1227
1228                 /* Don't create files with Microsoft wildcard characters. */
1229                 if (fsp->base_fsp) {
1230                         /*
1231                          * wildcard characters are allowed in stream names
1232                          * only test the basefilename
1233                          */
1234                         wild = fsp->base_fsp->fsp_name->base_name;
1235                 } else {
1236                         wild = smb_fname->base_name;
1237                 }
1238                 if ((local_flags & O_CREAT) && !file_existed &&
1239                     !(fsp->posix_flags & FSP_POSIX_FLAGS_PATHNAMES) &&
1240                     ms_has_wild(wild))  {
1241                         return NT_STATUS_OBJECT_NAME_INVALID;
1242                 }
1243
1244                 /* Can we access this file ? */
1245                 if (!fsp->base_fsp) {
1246                         /* Only do this check on non-stream open. */
1247                         if (file_existed) {
1248                                 status = smbd_check_access_rights(conn,
1249                                                 smb_fname,
1250                                                 false,
1251                                                 access_mask);
1252
1253                                 if (!NT_STATUS_IS_OK(status)) {
1254                                         DEBUG(10, ("open_file: "
1255                                                    "smbd_check_access_rights "
1256                                                    "on file %s returned %s\n",
1257                                                    smb_fname_str_dbg(smb_fname),
1258                                                    nt_errstr(status)));
1259                                 }
1260
1261                                 if (!NT_STATUS_IS_OK(status) &&
1262                                     !NT_STATUS_EQUAL(status,
1263                                         NT_STATUS_OBJECT_NAME_NOT_FOUND))
1264                                 {
1265                                         return status;
1266                                 }
1267
1268                                 if (NT_STATUS_EQUAL(status,
1269                                         NT_STATUS_OBJECT_NAME_NOT_FOUND))
1270                                 {
1271                                         DEBUG(10, ("open_file: "
1272                                                 "file %s vanished since we "
1273                                                 "checked for existence.\n",
1274                                                 smb_fname_str_dbg(smb_fname)));
1275                                         file_existed = false;
1276                                         SET_STAT_INVALID(fsp->fsp_name->st);
1277                                 }
1278                         }
1279
1280                         if (!file_existed) {
1281                                 if (!(local_flags & O_CREAT)) {
1282                                         /* File didn't exist and no O_CREAT. */
1283                                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
1284                                 }
1285
1286                                 status = check_parent_access(conn,
1287                                                              smb_fname,
1288                                                              SEC_DIR_ADD_FILE);
1289                                 if (!NT_STATUS_IS_OK(status)) {
1290                                         DEBUG(10, ("open_file: "
1291                                                    "check_parent_access on "
1292                                                    "file %s returned %s\n",
1293                                                    smb_fname_str_dbg(smb_fname),
1294                                                    nt_errstr(status) ));
1295                                         return status;
1296                                 }
1297                         }
1298                 }
1299
1300                 /*
1301                  * Actually do the open - if O_TRUNC is needed handle it
1302                  * below under the share mode lock.
1303                  */
1304                 status = fd_open_atomic(conn, fsp, local_flags & ~O_TRUNC,
1305                                 unx_mode, p_file_created);
1306                 if (!NT_STATUS_IS_OK(status)) {
1307                         DEBUG(3,("Error opening file %s (%s) (local_flags=%d) "
1308                                  "(flags=%d)\n", smb_fname_str_dbg(smb_fname),
1309                                  nt_errstr(status),local_flags,flags));
1310                         return status;
1311                 }
1312
1313                 if (local_flags & O_NONBLOCK) {
1314                         /*
1315                          * GPFS can return ETIMEDOUT for pread on
1316                          * nonblocking file descriptors when files
1317                          * migrated to tape need to be recalled. I
1318                          * could imagine this happens elsehwere
1319                          * too. With blocking file descriptors this
1320                          * does not happen.
1321                          */
1322                         ret = set_blocking(fsp->fh->fd, true);
1323                         if (ret == -1) {
1324                                 status = map_nt_error_from_unix(errno);
1325                                 DBG_WARNING("Could not set fd to blocking: "
1326                                             "%s\n", strerror(errno));
1327                                 fd_close(fsp);
1328                                 return status;
1329                         }
1330                 }
1331
1332                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
1333                 if (ret == -1) {
1334                         /* If we have an fd, this stat should succeed. */
1335                         DEBUG(0,("Error doing fstat on open file %s "
1336                                 "(%s)\n",
1337                                 smb_fname_str_dbg(smb_fname),
1338                                 strerror(errno) ));
1339                         status = map_nt_error_from_unix(errno);
1340                         fd_close(fsp);
1341                         return status;
1342                 }
1343
1344                 if (*p_file_created) {
1345                         /* We created this file. */
1346
1347                         bool need_re_stat = false;
1348                         /* Do all inheritance work after we've
1349                            done a successful fstat call and filled
1350                            in the stat struct in fsp->fsp_name. */
1351
1352                         /* Inherit the ACL if required */
1353                         if (lp_inherit_permissions(SNUM(conn))) {
1354                                 inherit_access_posix_acl(conn, parent_dir,
1355                                                          smb_fname,
1356                                                          unx_mode);
1357                                 need_re_stat = true;
1358                         }
1359
1360                         /* Change the owner if required. */
1361                         if (lp_inherit_owner(SNUM(conn)) != INHERIT_OWNER_NO) {
1362                                 change_file_owner_to_parent(conn, parent_dir,
1363                                                             fsp);
1364                                 need_re_stat = true;
1365                         }
1366
1367                         if (need_re_stat) {
1368                                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
1369                                 /* If we have an fd, this stat should succeed. */
1370                                 if (ret == -1) {
1371                                         DEBUG(0,("Error doing fstat on open file %s "
1372                                                  "(%s)\n",
1373                                                  smb_fname_str_dbg(smb_fname),
1374                                                  strerror(errno) ));
1375                                 }
1376                         }
1377
1378                         notify_fname(conn, NOTIFY_ACTION_ADDED,
1379                                      FILE_NOTIFY_CHANGE_FILE_NAME,
1380                                      smb_fname->base_name);
1381                 }
1382         } else {
1383                 fsp->fh->fd = -1; /* What we used to call a stat open. */
1384                 if (!file_existed) {
1385                         /* File must exist for a stat open. */
1386                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
1387                 }
1388
1389                 status = smbd_check_access_rights(conn,
1390                                 smb_fname,
1391                                 false,
1392                                 access_mask);
1393
1394                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
1395                                 (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) &&
1396                                 S_ISLNK(smb_fname->st.st_ex_mode)) {
1397                         /* This is a POSIX stat open for delete
1398                          * or rename on a symlink that points
1399                          * nowhere. Allow. */
1400                         DEBUG(10,("open_file: allowing POSIX "
1401                                   "open on bad symlink %s\n",
1402                                   smb_fname_str_dbg(smb_fname)));
1403                         status = NT_STATUS_OK;
1404                 }
1405
1406                 if (!NT_STATUS_IS_OK(status)) {
1407                         DEBUG(10,("open_file: "
1408                                 "smbd_check_access_rights on file "
1409                                 "%s returned %s\n",
1410                                 smb_fname_str_dbg(smb_fname),
1411                                 nt_errstr(status) ));
1412                         return status;
1413                 }
1414         }
1415
1416         /*
1417          * POSIX allows read-only opens of directories. We don't
1418          * want to do this (we use a different code path for this)
1419          * so catch a directory open and return an EISDIR. JRA.
1420          */
1421
1422         if(S_ISDIR(smb_fname->st.st_ex_mode)) {
1423                 fd_close(fsp);
1424                 errno = EISDIR;
1425                 return NT_STATUS_FILE_IS_A_DIRECTORY;
1426         }
1427
1428         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
1429         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
1430         fsp->file_pid = req ? req->smbpid : 0;
1431         fsp->can_lock = True;
1432         fsp->can_read = ((access_mask & FILE_READ_DATA) != 0);
1433         fsp->can_write =
1434                 CAN_WRITE(conn) &&
1435                 ((access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) != 0);
1436         fsp->print_file = NULL;
1437         fsp->modified = False;
1438         fsp->sent_oplock_break = NO_BREAK_SENT;
1439         fsp->is_directory = False;
1440         if (conn->aio_write_behind_list &&
1441             is_in_path(smb_fname->base_name, conn->aio_write_behind_list,
1442                        conn->case_sensitive)) {
1443                 fsp->aio_write_behind = True;
1444         }
1445
1446         fsp->wcp = NULL; /* Write cache pointer. */
1447
1448         DEBUG(2,("%s opened file %s read=%s write=%s (numopen=%d)\n",
1449                  conn->session_info->unix_info->unix_name,
1450                  smb_fname_str_dbg(smb_fname),
1451                  BOOLSTR(fsp->can_read), BOOLSTR(fsp->can_write),
1452                  conn->num_files_open));
1453
1454         errno = 0;
1455         return NT_STATUS_OK;
1456 }
1457
1458 /****************************************************************************
1459  Check if we can open a file with a share mode.
1460  Returns True if conflict, False if not.
1461 ****************************************************************************/
1462
1463 static bool share_conflict(struct share_mode_entry *entry,
1464                            uint32_t access_mask,
1465                            uint32_t share_access)
1466 {
1467         DEBUG(10,("share_conflict: entry->access_mask = 0x%x, "
1468                   "entry->share_access = 0x%x, "
1469                   "entry->private_options = 0x%x\n",
1470                   (unsigned int)entry->access_mask,
1471                   (unsigned int)entry->share_access,
1472                   (unsigned int)entry->private_options));
1473
1474         if (server_id_is_disconnected(&entry->pid)) {
1475                 /*
1476                  * note: cleanup should have been done by
1477                  * delay_for_batch_oplocks()
1478                  */
1479                 return false;
1480         }
1481
1482         DEBUG(10,("share_conflict: access_mask = 0x%x, share_access = 0x%x\n",
1483                   (unsigned int)access_mask, (unsigned int)share_access));
1484
1485         if ((entry->access_mask & (FILE_WRITE_DATA|
1486                                    FILE_APPEND_DATA|
1487                                    FILE_READ_DATA|
1488                                    FILE_EXECUTE|
1489                                    DELETE_ACCESS)) == 0) {
1490                 DEBUG(10,("share_conflict: No conflict due to "
1491                           "entry->access_mask = 0x%x\n",
1492                           (unsigned int)entry->access_mask ));
1493                 return False;
1494         }
1495
1496         if ((access_mask & (FILE_WRITE_DATA|
1497                             FILE_APPEND_DATA|
1498                             FILE_READ_DATA|
1499                             FILE_EXECUTE|
1500                             DELETE_ACCESS)) == 0) {
1501                 DEBUG(10,("share_conflict: No conflict due to "
1502                           "access_mask = 0x%x\n",
1503                           (unsigned int)access_mask ));
1504                 return False;
1505         }
1506
1507 #if 1 /* JRA TEST - Superdebug. */
1508 #define CHECK_MASK(num, am, right, sa, share) \
1509         DEBUG(10,("share_conflict: [%d] am (0x%x) & right (0x%x) = 0x%x\n", \
1510                 (unsigned int)(num), (unsigned int)(am), \
1511                 (unsigned int)(right), (unsigned int)(am)&(right) )); \
1512         DEBUG(10,("share_conflict: [%d] sa (0x%x) & share (0x%x) = 0x%x\n", \
1513                 (unsigned int)(num), (unsigned int)(sa), \
1514                 (unsigned int)(share), (unsigned int)(sa)&(share) )); \
1515         if (((am) & (right)) && !((sa) & (share))) { \
1516                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1517 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1518                         (unsigned int)(share) )); \
1519                 return True; \
1520         }
1521 #else
1522 #define CHECK_MASK(num, am, right, sa, share) \
1523         if (((am) & (right)) && !((sa) & (share))) { \
1524                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1525 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1526                         (unsigned int)(share) )); \
1527                 return True; \
1528         }
1529 #endif
1530
1531         CHECK_MASK(1, entry->access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1532                    share_access, FILE_SHARE_WRITE);
1533         CHECK_MASK(2, access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1534                    entry->share_access, FILE_SHARE_WRITE);
1535
1536         CHECK_MASK(3, entry->access_mask, FILE_READ_DATA | FILE_EXECUTE,
1537                    share_access, FILE_SHARE_READ);
1538         CHECK_MASK(4, access_mask, FILE_READ_DATA | FILE_EXECUTE,
1539                    entry->share_access, FILE_SHARE_READ);
1540
1541         CHECK_MASK(5, entry->access_mask, DELETE_ACCESS,
1542                    share_access, FILE_SHARE_DELETE);
1543         CHECK_MASK(6, access_mask, DELETE_ACCESS,
1544                    entry->share_access, FILE_SHARE_DELETE);
1545
1546         DEBUG(10,("share_conflict: No conflict.\n"));
1547         return False;
1548 }
1549
1550 #if defined(DEVELOPER)
1551 static void validate_my_share_entries(struct smbd_server_connection *sconn,
1552                                       const struct file_id id,
1553                                       int num,
1554                                       struct share_mode_entry *share_entry)
1555 {
1556         struct server_id self = messaging_server_id(sconn->msg_ctx);
1557         files_struct *fsp;
1558
1559         if (!serverid_equal(&self, &share_entry->pid)) {
1560                 return;
1561         }
1562
1563         if (share_entry->op_mid == 0) {
1564                 /* INTERNAL_OPEN_ONLY */
1565                 return;
1566         }
1567
1568         if (!is_valid_share_mode_entry(share_entry)) {
1569                 return;
1570         }
1571
1572         fsp = file_find_dif(sconn, id, share_entry->share_file_id);
1573         if (!fsp) {
1574                 DBG_ERR("PANIC : %s\n",
1575                         share_mode_str(talloc_tos(), num, &id,
1576                                        share_entry));
1577                 smb_panic("validate_my_share_entries: Cannot match a "
1578                           "share entry with an open file\n");
1579         }
1580
1581         if (((uint16_t)fsp->oplock_type) != share_entry->op_type) {
1582                 goto panic;
1583         }
1584
1585         return;
1586
1587  panic:
1588         {
1589                 char *str;
1590                 DBG_ERR("validate_my_share_entries: PANIC : %s\n",
1591                         share_mode_str(talloc_tos(), num, &id,
1592                                        share_entry));
1593                 str = talloc_asprintf(talloc_tos(),
1594                         "validate_my_share_entries: "
1595                         "file %s, oplock_type = 0x%x, op_type = 0x%x\n",
1596                          fsp->fsp_name->base_name,
1597                          (unsigned int)fsp->oplock_type,
1598                          (unsigned int)share_entry->op_type );
1599                 smb_panic(str);
1600         }
1601 }
1602 #endif
1603
1604 bool is_stat_open(uint32_t access_mask)
1605 {
1606         const uint32_t stat_open_bits =
1607                 (SYNCHRONIZE_ACCESS|
1608                  FILE_READ_ATTRIBUTES|
1609                  FILE_WRITE_ATTRIBUTES);
1610
1611         return (((access_mask &  stat_open_bits) != 0) &&
1612                 ((access_mask & ~stat_open_bits) == 0));
1613 }
1614
1615 static bool has_delete_on_close(struct share_mode_lock *lck,
1616                                 uint32_t name_hash)
1617 {
1618         struct share_mode_data *d = lck->data;
1619         uint32_t i;
1620
1621         if (d->num_share_modes == 0) {
1622                 return false;
1623         }
1624         if (!is_delete_on_close_set(lck, name_hash)) {
1625                 return false;
1626         }
1627         for (i=0; i<d->num_share_modes; i++) {
1628                 if (!share_mode_stale_pid(d, i)) {
1629                         return true;
1630                 }
1631         }
1632         return false;
1633 }
1634
1635 /****************************************************************************
1636  Deal with share modes
1637  Invariant: Share mode must be locked on entry and exit.
1638  Returns -1 on error, or number of share modes on success (may be zero).
1639 ****************************************************************************/
1640
1641 static NTSTATUS open_mode_check(connection_struct *conn,
1642                                 struct share_mode_lock *lck,
1643                                 uint32_t access_mask,
1644                                 uint32_t share_access)
1645 {
1646         uint32_t i;
1647
1648         if(lck->data->num_share_modes == 0) {
1649                 return NT_STATUS_OK;
1650         }
1651
1652         if (is_stat_open(access_mask)) {
1653                 /* Stat open that doesn't trigger oplock breaks or share mode
1654                  * checks... ! JRA. */
1655                 return NT_STATUS_OK;
1656         }
1657
1658         /*
1659          * Check if the share modes will give us access.
1660          */
1661
1662 #if defined(DEVELOPER)
1663         for(i = 0; i < lck->data->num_share_modes; i++) {
1664                 validate_my_share_entries(conn->sconn, lck->data->id, i,
1665                                           &lck->data->share_modes[i]);
1666         }
1667 #endif
1668
1669         /* Now we check the share modes, after any oplock breaks. */
1670         for(i = 0; i < lck->data->num_share_modes; i++) {
1671
1672                 if (!is_valid_share_mode_entry(&lck->data->share_modes[i])) {
1673                         continue;
1674                 }
1675
1676                 /* someone else has a share lock on it, check to see if we can
1677                  * too */
1678                 if (share_conflict(&lck->data->share_modes[i],
1679                                    access_mask, share_access)) {
1680
1681                         if (share_mode_stale_pid(lck->data, i)) {
1682                                 continue;
1683                         }
1684
1685                         return NT_STATUS_SHARING_VIOLATION;
1686                 }
1687         }
1688
1689         return NT_STATUS_OK;
1690 }
1691
1692 /*
1693  * Send a break message to the oplock holder and delay the open for
1694  * our client.
1695  */
1696
1697 NTSTATUS send_break_message(struct messaging_context *msg_ctx,
1698                             const struct file_id *id,
1699                             const struct share_mode_entry *exclusive,
1700                             uint16_t break_to)
1701 {
1702         NTSTATUS status;
1703         char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
1704         struct server_id_buf tmp;
1705
1706         DEBUG(10, ("Sending break request to PID %s\n",
1707                    server_id_str_buf(exclusive->pid, &tmp)));
1708
1709         /* Create the message. */
1710         share_mode_entry_to_message(msg, id, exclusive);
1711
1712         /* Overload entry->op_type */
1713         /*
1714          * This is a cut from uint32_t to uint16_t, but so far only the lower 3
1715          * bits (LEASE_WRITE/HANDLE/READ are used anyway.
1716          */
1717         SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET, break_to);
1718
1719         status = messaging_send_buf(msg_ctx, exclusive->pid,
1720                                     MSG_SMB_BREAK_REQUEST,
1721                                     (uint8_t *)msg, sizeof(msg));
1722         if (!NT_STATUS_IS_OK(status)) {
1723                 DEBUG(3, ("Could not send oplock break message: %s\n",
1724                           nt_errstr(status)));
1725         }
1726
1727         return status;
1728 }
1729
1730 /*
1731  * Do internal consistency checks on the share mode for a file.
1732  */
1733
1734 static bool validate_oplock_types(struct share_mode_lock *lck)
1735 {
1736         struct share_mode_data *d = lck->data;
1737         bool batch = false;
1738         bool ex_or_batch = false;
1739         bool level2 = false;
1740         bool no_oplock = false;
1741         uint32_t num_non_stat_opens = 0;
1742         uint32_t i;
1743
1744         for (i=0; i<d->num_share_modes; i++) {
1745                 struct share_mode_entry *e = &d->share_modes[i];
1746
1747                 if (!is_valid_share_mode_entry(e)) {
1748                         continue;
1749                 }
1750
1751                 if (e->op_mid == 0) {
1752                         /* INTERNAL_OPEN_ONLY */
1753                         continue;
1754                 }
1755
1756                 if (e->op_type == NO_OPLOCK && is_stat_open(e->access_mask)) {
1757                         /* We ignore stat opens in the table - they
1758                            always have NO_OPLOCK and never get or
1759                            cause breaks. JRA. */
1760                         continue;
1761                 }
1762
1763                 num_non_stat_opens += 1;
1764
1765                 if (BATCH_OPLOCK_TYPE(e->op_type)) {
1766                         /* batch - can only be one. */
1767                         if (share_mode_stale_pid(d, i)) {
1768                                 DEBUG(10, ("Found stale batch oplock\n"));
1769                                 continue;
1770                         }
1771                         if (ex_or_batch || batch || level2 || no_oplock) {
1772                                 DEBUG(0, ("Bad batch oplock entry %u.",
1773                                           (unsigned)i));
1774                                 return false;
1775                         }
1776                         batch = true;
1777                 }
1778
1779                 if (EXCLUSIVE_OPLOCK_TYPE(e->op_type)) {
1780                         if (share_mode_stale_pid(d, i)) {
1781                                 DEBUG(10, ("Found stale duplicate oplock\n"));
1782                                 continue;
1783                         }
1784                         /* Exclusive or batch - can only be one. */
1785                         if (ex_or_batch || level2 || no_oplock) {
1786                                 DEBUG(0, ("Bad exclusive or batch oplock "
1787                                           "entry %u.", (unsigned)i));
1788                                 return false;
1789                         }
1790                         ex_or_batch = true;
1791                 }
1792
1793                 if (LEVEL_II_OPLOCK_TYPE(e->op_type)) {
1794                         if (batch || ex_or_batch) {
1795                                 if (share_mode_stale_pid(d, i)) {
1796                                         DEBUG(10, ("Found stale LevelII "
1797                                                    "oplock\n"));
1798                                         continue;
1799                                 }
1800                                 DEBUG(0, ("Bad levelII oplock entry %u.",
1801                                           (unsigned)i));
1802                                 return false;
1803                         }
1804                         level2 = true;
1805                 }
1806
1807                 if (e->op_type == NO_OPLOCK) {
1808                         if (batch || ex_or_batch) {
1809                                 if (share_mode_stale_pid(d, i)) {
1810                                         DEBUG(10, ("Found stale NO_OPLOCK "
1811                                                    "entry\n"));
1812                                         continue;
1813                                 }
1814                                 DEBUG(0, ("Bad no oplock entry %u.",
1815                                           (unsigned)i));
1816                                 return false;
1817                         }
1818                         no_oplock = true;
1819                 }
1820         }
1821
1822         remove_stale_share_mode_entries(d);
1823
1824         if ((batch || ex_or_batch) && (num_non_stat_opens != 1)) {
1825                 DEBUG(1, ("got batch (%d) or ex (%d) non-exclusively (%d)\n",
1826                           (int)batch, (int)ex_or_batch,
1827                           (int)d->num_share_modes));
1828                 return false;
1829         }
1830
1831         return true;
1832 }
1833
1834 static bool delay_for_oplock(files_struct *fsp,
1835                              int oplock_request,
1836                              const struct smb2_lease *lease,
1837                              struct share_mode_lock *lck,
1838                              bool have_sharing_violation,
1839                              uint32_t create_disposition,
1840                              bool first_open_attempt)
1841 {
1842         struct share_mode_data *d = lck->data;
1843         uint32_t i;
1844         bool delay = false;
1845         bool will_overwrite;
1846
1847         if ((oplock_request & INTERNAL_OPEN_ONLY) ||
1848             is_stat_open(fsp->access_mask)) {
1849                 return false;
1850         }
1851
1852         switch (create_disposition) {
1853         case FILE_SUPERSEDE:
1854         case FILE_OVERWRITE:
1855         case FILE_OVERWRITE_IF:
1856                 will_overwrite = true;
1857                 break;
1858         default:
1859                 will_overwrite = false;
1860                 break;
1861         }
1862
1863         for (i=0; i<d->num_share_modes; i++) {
1864                 struct share_mode_entry *e = &d->share_modes[i];
1865                 bool e_is_lease = (e->op_type == LEASE_OPLOCK);
1866                 uint32_t e_lease_type = get_lease_type(d, e);
1867                 uint32_t break_to;
1868                 uint32_t delay_mask = 0;
1869                 bool lease_is_breaking = false;
1870
1871                 if (e_is_lease) {
1872                         NTSTATUS status;
1873
1874                         status = leases_db_get(
1875                                 &e->client_guid,
1876                                 &e->lease_key,
1877                                 &fsp->file_id,
1878                                 NULL, /* current_state */
1879                                 &lease_is_breaking,
1880                                 NULL, /* breaking_to_requested */
1881                                 NULL, /* breaking_to_required */
1882                                 NULL, /* lease_version */
1883                                 NULL); /* epoch */
1884                         SMB_ASSERT(NT_STATUS_IS_OK(status));
1885                 }
1886
1887                 if (have_sharing_violation) {
1888                         delay_mask = SMB2_LEASE_HANDLE;
1889                 } else {
1890                         delay_mask = SMB2_LEASE_WRITE;
1891                 }
1892
1893                 break_to = e_lease_type & ~delay_mask;
1894
1895                 if (will_overwrite) {
1896                         /*
1897                          * we'll decide about SMB2_LEASE_READ later.
1898                          *
1899                          * Maybe the break will be deferred
1900                          */
1901                         break_to &= ~SMB2_LEASE_HANDLE;
1902                 }
1903
1904                 DEBUG(10, ("entry %u: e_lease_type %u, will_overwrite: %u\n",
1905                            (unsigned)i, (unsigned)e_lease_type,
1906                            (unsigned)will_overwrite));
1907
1908                 if (e_is_lease && lease != NULL) {
1909                         bool ign;
1910
1911                         ign = smb2_lease_equal(fsp_client_guid(fsp),
1912                                                &lease->lease_key,
1913                                                &e->client_guid,
1914                                                &e->lease_key);
1915                         if (ign) {
1916                                 continue;
1917                         }
1918                 }
1919
1920                 if ((e_lease_type & ~break_to) == 0) {
1921                         if (lease_is_breaking) {
1922                                 delay = true;
1923                         }
1924                         continue;
1925                 }
1926
1927                 if (share_mode_stale_pid(d, i)) {
1928                         continue;
1929                 }
1930
1931                 if (will_overwrite) {
1932                         /*
1933                          * If we break anyway break to NONE directly.
1934                          * Otherwise vfs_set_filelen() will trigger the
1935                          * break.
1936                          */
1937                         break_to &= ~(SMB2_LEASE_READ|SMB2_LEASE_WRITE);
1938                 }
1939
1940                 if (!e_is_lease) {
1941                         /*
1942                          * Oplocks only support breaking to R or NONE.
1943                          */
1944                         break_to &= ~(SMB2_LEASE_HANDLE|SMB2_LEASE_WRITE);
1945                 }
1946
1947                 DEBUG(10, ("breaking from %d to %d\n",
1948                            (int)e_lease_type, (int)break_to));
1949                 send_break_message(fsp->conn->sconn->msg_ctx, &fsp->file_id,
1950                                    e, break_to);
1951                 if (e_lease_type & delay_mask) {
1952                         delay = true;
1953                 }
1954                 if (lease_is_breaking && !first_open_attempt) {
1955                         delay = true;
1956                 }
1957                 continue;
1958         }
1959
1960         return delay;
1961 }
1962
1963 static bool file_has_brlocks(files_struct *fsp)
1964 {
1965         struct byte_range_lock *br_lck;
1966
1967         br_lck = brl_get_locks_readonly(fsp);
1968         if (!br_lck)
1969                 return false;
1970
1971         return (brl_num_locks(br_lck) > 0);
1972 }
1973
1974 int find_share_mode_lease(struct share_mode_data *d,
1975                           const struct GUID *client_guid,
1976                           const struct smb2_lease_key *key)
1977 {
1978         uint32_t i;
1979
1980         for (i=0; i<d->num_leases; i++) {
1981                 struct share_mode_lease *l = &d->leases[i];
1982
1983                 if (smb2_lease_equal(client_guid,
1984                                      key,
1985                                      &l->client_guid,
1986                                      &l->lease_key)) {
1987                         return i;
1988                 }
1989         }
1990
1991         return -1;
1992 }
1993
1994 struct fsp_lease *find_fsp_lease(struct files_struct *new_fsp,
1995                                  const struct smb2_lease_key *key,
1996                                  uint32_t current_state,
1997                                  uint16_t lease_version,
1998                                  uint16_t lease_epoch)
1999 {
2000         struct files_struct *fsp;
2001
2002         /*
2003          * TODO: Measure how expensive this loop is with thousands of open
2004          * handles...
2005          */
2006
2007         for (fsp = file_find_di_first(new_fsp->conn->sconn, new_fsp->file_id);
2008              fsp != NULL;
2009              fsp = file_find_di_next(fsp)) {
2010
2011                 if (fsp == new_fsp) {
2012                         continue;
2013                 }
2014                 if (fsp->oplock_type != LEASE_OPLOCK) {
2015                         continue;
2016                 }
2017                 if (smb2_lease_key_equal(&fsp->lease->lease.lease_key, key)) {
2018                         fsp->lease->ref_count += 1;
2019                         return fsp->lease;
2020                 }
2021         }
2022
2023         /* Not found - must be leased in another smbd. */
2024         new_fsp->lease = talloc_zero(new_fsp->conn->sconn, struct fsp_lease);
2025         if (new_fsp->lease == NULL) {
2026                 return NULL;
2027         }
2028         new_fsp->lease->ref_count = 1;
2029         new_fsp->lease->sconn = new_fsp->conn->sconn;
2030         new_fsp->lease->lease.lease_key = *key;
2031         new_fsp->lease->lease.lease_state = current_state;
2032         /*
2033          * We internally treat all leases as V2 and update
2034          * the epoch, but when sending breaks it matters if
2035          * the requesting lease was v1 or v2.
2036          */
2037         new_fsp->lease->lease.lease_version = lease_version;
2038         new_fsp->lease->lease.lease_epoch = lease_epoch;
2039         return new_fsp->lease;
2040 }
2041
2042 static NTSTATUS grant_fsp_lease(struct files_struct *fsp,
2043                                 struct share_mode_lock *lck,
2044                                 const struct smb2_lease *lease,
2045                                 uint32_t *p_lease_idx,
2046                                 uint32_t granted)
2047 {
2048         struct share_mode_data *d = lck->data;
2049         const struct GUID *client_guid = fsp_client_guid(fsp);
2050         struct share_mode_lease *tmp;
2051         NTSTATUS status;
2052         int idx;
2053
2054         idx = find_share_mode_lease(d, client_guid, &lease->lease_key);
2055
2056         if (idx != -1) {
2057                 struct share_mode_lease *l = &d->leases[idx];
2058                 bool do_upgrade;
2059                 uint32_t existing, requested;
2060
2061                 fsp->lease = find_fsp_lease(
2062                         fsp,
2063                         &lease->lease_key,
2064                         l->current_state,
2065                         l->lease_version,
2066                         l->epoch);
2067                 if (fsp->lease == NULL) {
2068                         DEBUG(1, ("Did not find existing lease for file %s\n",
2069                                   fsp_str_dbg(fsp)));
2070                         return NT_STATUS_NO_MEMORY;
2071                 }
2072
2073                 *p_lease_idx = idx;
2074
2075                 /*
2076                  * Upgrade only if the requested lease is a strict upgrade.
2077                  */
2078                 existing = l->current_state;
2079                 requested = lease->lease_state;
2080
2081                 /*
2082                  * Tricky: This test makes sure that "requested" is a
2083                  * strict bitwise superset of "existing".
2084                  */
2085                 do_upgrade = ((existing & requested) == existing);
2086
2087                 /*
2088                  * Upgrade only if there's a change.
2089                  */
2090                 do_upgrade &= (granted != existing);
2091
2092                 /*
2093                  * Upgrade only if other leases don't prevent what was asked
2094                  * for.
2095                  */
2096                 do_upgrade &= (granted == requested);
2097
2098                 /*
2099                  * only upgrade if we are not in breaking state
2100                  */
2101                 do_upgrade &= !l->breaking;
2102
2103                 DEBUG(10, ("existing=%"PRIu32", requested=%"PRIu32", "
2104                            "granted=%"PRIu32", do_upgrade=%d\n",
2105                            existing, requested, granted, (int)do_upgrade));
2106
2107                 if (do_upgrade) {
2108                         l->current_state = granted;
2109                         l->epoch += 1;
2110                 }
2111
2112                 {
2113                         NTSTATUS set_status;
2114
2115                         set_status = leases_db_set(
2116                                 client_guid,
2117                                 &lease->lease_key,
2118                                 l->current_state,
2119                                 l->breaking,
2120                                 l->breaking_to_requested,
2121                                 l->breaking_to_required,
2122                                 l->lease_version,
2123                                 l->epoch);
2124
2125                         if (!NT_STATUS_IS_OK(set_status)) {
2126                                 DBG_DEBUG("leases_db_set failed: %s\n",
2127                                           nt_errstr(set_status));
2128                                 return set_status;
2129                         }
2130                 }
2131
2132                 /* Ensure we're in sync with current lease state. */
2133                 fsp_lease_update(lck, fsp_client_guid(fsp), fsp->lease);
2134                 return NT_STATUS_OK;
2135         }
2136
2137         /*
2138          * Create new lease
2139          */
2140
2141         tmp = talloc_realloc(d, d->leases, struct share_mode_lease,
2142                              d->num_leases+1);
2143         if (tmp == NULL) {
2144                 /*
2145                  * See [MS-SMB2]
2146                  */
2147                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2148         }
2149         d->leases = tmp;
2150
2151         fsp->lease = talloc_zero(fsp->conn->sconn, struct fsp_lease);
2152         if (fsp->lease == NULL) {
2153                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2154         }
2155         fsp->lease->ref_count = 1;
2156         fsp->lease->sconn = fsp->conn->sconn;
2157         fsp->lease->lease.lease_version = lease->lease_version;
2158         fsp->lease->lease.lease_key = lease->lease_key;
2159         fsp->lease->lease.lease_state = granted;
2160         fsp->lease->lease.lease_epoch = lease->lease_epoch + 1;
2161
2162         *p_lease_idx = d->num_leases;
2163
2164         d->leases[d->num_leases] = (struct share_mode_lease) {
2165                 .client_guid = *client_guid,
2166                 .lease_key = fsp->lease->lease.lease_key,
2167                 .current_state = fsp->lease->lease.lease_state,
2168                 .lease_version = fsp->lease->lease.lease_version,
2169                 .epoch = fsp->lease->lease.lease_epoch,
2170         };
2171
2172         status = leases_db_add(client_guid,
2173                                &lease->lease_key,
2174                                &fsp->file_id,
2175                                fsp->lease->lease.lease_state,
2176                                fsp->lease->lease.lease_version,
2177                                fsp->lease->lease.lease_epoch,
2178                                fsp->conn->connectpath,
2179                                fsp->fsp_name->base_name,
2180                                fsp->fsp_name->stream_name);
2181         if (!NT_STATUS_IS_OK(status)) {
2182                 DEBUG(10, ("%s: leases_db_add failed: %s\n", __func__,
2183                            nt_errstr(status)));
2184                 TALLOC_FREE(fsp->lease);
2185                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2186         }
2187
2188         d->num_leases += 1;
2189         d->modified = true;
2190
2191         return NT_STATUS_OK;
2192 }
2193
2194 static bool is_same_lease(const files_struct *fsp,
2195                           const struct share_mode_data *d,
2196                           const struct share_mode_entry *e,
2197                           const struct smb2_lease *lease)
2198 {
2199         if (e->op_type != LEASE_OPLOCK) {
2200                 return false;
2201         }
2202         if (lease == NULL) {
2203                 return false;
2204         }
2205
2206         return smb2_lease_equal(fsp_client_guid(fsp),
2207                                 &lease->lease_key,
2208                                 &e->client_guid,
2209                                 &e->lease_key);
2210 }
2211
2212 static int map_lease_type_to_oplock(uint32_t lease_type)
2213 {
2214         int result = NO_OPLOCK;
2215
2216         switch (lease_type) {
2217         case SMB2_LEASE_READ|SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE:
2218                 result = BATCH_OPLOCK|EXCLUSIVE_OPLOCK;
2219                 break;
2220         case SMB2_LEASE_READ|SMB2_LEASE_WRITE:
2221                 result = EXCLUSIVE_OPLOCK;
2222                 break;
2223         case SMB2_LEASE_READ|SMB2_LEASE_HANDLE:
2224         case SMB2_LEASE_READ:
2225                 result = LEVEL_II_OPLOCK;
2226                 break;
2227         }
2228
2229         return result;
2230 }
2231
2232 static NTSTATUS grant_fsp_oplock_type(struct smb_request *req,
2233                                       struct files_struct *fsp,
2234                                       struct share_mode_lock *lck,
2235                                       int oplock_request,
2236                                       struct smb2_lease *lease)
2237 {
2238         struct share_mode_data *d = lck->data;
2239         bool got_handle_lease = false;
2240         bool got_oplock = false;
2241         uint32_t i;
2242         uint32_t granted;
2243         uint32_t lease_idx = UINT32_MAX;
2244         const struct GUID *client_guid = NULL;
2245         const struct smb2_lease_key *lease_key = NULL;
2246         bool ok;
2247         NTSTATUS status;
2248
2249         if (oplock_request & INTERNAL_OPEN_ONLY) {
2250                 /* No oplocks on internal open. */
2251                 oplock_request = NO_OPLOCK;
2252                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
2253                         fsp->oplock_type, fsp_str_dbg(fsp)));
2254         }
2255
2256         if (oplock_request == LEASE_OPLOCK) {
2257                 if (lease == NULL) {
2258                         /*
2259                          * The SMB2 layer should have checked this
2260                          */
2261                         return NT_STATUS_INTERNAL_ERROR;
2262                 }
2263
2264                 granted = lease->lease_state;
2265
2266                 if (lp_kernel_oplocks(SNUM(fsp->conn))) {
2267                         DEBUG(10, ("No lease granted because kernel oplocks are enabled\n"));
2268                         granted = SMB2_LEASE_NONE;
2269                 }
2270                 if ((granted & (SMB2_LEASE_READ|SMB2_LEASE_WRITE)) == 0) {
2271                         DEBUG(10, ("No read or write lease requested\n"));
2272                         granted = SMB2_LEASE_NONE;
2273                 }
2274                 if (granted == SMB2_LEASE_WRITE) {
2275                         DEBUG(10, ("pure write lease requested\n"));
2276                         granted = SMB2_LEASE_NONE;
2277                 }
2278                 if (granted == (SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE)) {
2279                         DEBUG(10, ("write and handle lease requested\n"));
2280                         granted = SMB2_LEASE_NONE;
2281                 }
2282         } else {
2283                 granted = map_oplock_to_lease_type(
2284                         oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
2285         }
2286
2287         if (lp_locking(fsp->conn->params) && file_has_brlocks(fsp)) {
2288                 DEBUG(10,("grant_fsp_oplock_type: file %s has byte range locks\n",
2289                         fsp_str_dbg(fsp)));
2290                 granted &= ~SMB2_LEASE_READ;
2291         }
2292
2293         for (i=0; i<d->num_share_modes; i++) {
2294                 struct share_mode_entry *e = &d->share_modes[i];
2295                 uint32_t e_lease_type;
2296
2297                 e_lease_type = get_lease_type(d, e);
2298
2299                 if ((granted & SMB2_LEASE_WRITE) &&
2300                     !is_same_lease(fsp, d, e, lease) &&
2301                     !share_mode_stale_pid(d, i)) {
2302                         /*
2303                          * Can grant only one writer
2304                          */
2305                         granted &= ~SMB2_LEASE_WRITE;
2306                 }
2307
2308                 if ((e_lease_type & SMB2_LEASE_HANDLE) && !got_handle_lease &&
2309                     !share_mode_stale_pid(d, i)) {
2310                         got_handle_lease = true;
2311                 }
2312
2313                 if ((e->op_type != LEASE_OPLOCK) && !got_oplock &&
2314                     !share_mode_stale_pid(d, i)) {
2315                         got_oplock = true;
2316                 }
2317         }
2318
2319         if ((granted & SMB2_LEASE_READ) && !(granted & SMB2_LEASE_WRITE)) {
2320                 bool allow_level2 =
2321                         (global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
2322                         lp_level2_oplocks(SNUM(fsp->conn));
2323
2324                 if (!allow_level2) {
2325                         granted = SMB2_LEASE_NONE;
2326                 }
2327         }
2328
2329         if (oplock_request == LEASE_OPLOCK) {
2330                 if (got_oplock) {
2331                         granted &= ~SMB2_LEASE_HANDLE;
2332                 }
2333
2334                 fsp->oplock_type = LEASE_OPLOCK;
2335
2336                 status = grant_fsp_lease(fsp, lck, lease, &lease_idx,
2337                                          granted);
2338                 if (!NT_STATUS_IS_OK(status)) {
2339                         return status;
2340
2341                 }
2342                 *lease = fsp->lease->lease;
2343
2344                 lease_key = &fsp->lease->lease.lease_key;
2345                 client_guid = fsp_client_guid(fsp);
2346
2347                 DEBUG(10, ("lease_state=%d\n", lease->lease_state));
2348         } else {
2349                 if (got_handle_lease) {
2350                         granted = SMB2_LEASE_NONE;
2351                 }
2352
2353                 fsp->oplock_type = map_lease_type_to_oplock(granted);
2354
2355                 status = set_file_oplock(fsp);
2356                 if (!NT_STATUS_IS_OK(status)) {
2357                         /*
2358                          * Could not get the kernel oplock
2359                          */
2360                         fsp->oplock_type = NO_OPLOCK;
2361                 }
2362         }
2363
2364         ok = set_share_mode(
2365                 lck,
2366                 fsp,
2367                 get_current_uid(fsp->conn),
2368                 req ? req->mid : 0,
2369                 fsp->oplock_type,
2370                 client_guid,
2371                 lease_key);
2372         if (!ok) {
2373                 return NT_STATUS_NO_MEMORY;
2374         }
2375
2376         ok = update_num_read_oplocks(fsp, lck);
2377         if (!ok) {
2378                 del_share_mode(lck, fsp);
2379                 return NT_STATUS_INTERNAL_ERROR;
2380         }
2381
2382         DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
2383                   fsp->oplock_type, fsp_str_dbg(fsp)));
2384
2385         return NT_STATUS_OK;
2386 }
2387
2388 static bool request_timed_out(struct timeval request_time,
2389                               struct timeval timeout)
2390 {
2391         struct timeval now, end_time;
2392         GetTimeOfDay(&now);
2393         end_time = timeval_sum(&request_time, &timeout);
2394         return (timeval_compare(&end_time, &now) < 0);
2395 }
2396
2397 static struct deferred_open_record *deferred_open_record_create(
2398         bool delayed_for_oplocks,
2399         bool async_open,
2400         struct file_id id)
2401 {
2402         struct deferred_open_record *record = NULL;
2403
2404         record = talloc(NULL, struct deferred_open_record);
2405         if (record == NULL) {
2406                 return NULL;
2407         }
2408
2409         *record = (struct deferred_open_record) {
2410                 .delayed_for_oplocks = delayed_for_oplocks,
2411                 .async_open = async_open,
2412                 .id = id,
2413         };
2414
2415         return record;
2416 }
2417
2418 struct defer_open_state {
2419         struct smbXsrv_connection *xconn;
2420         uint64_t mid;
2421 };
2422
2423 static void defer_open_done(struct tevent_req *req);
2424
2425 /**
2426  * Defer an open and watch a locking.tdb record
2427  *
2428  * This defers an open that gets rescheduled once the locking.tdb record watch
2429  * is triggered by a change to the record.
2430  *
2431  * It is used to defer opens that triggered an oplock break and for the SMB1
2432  * sharing violation delay.
2433  **/
2434 static void defer_open(struct share_mode_lock *lck,
2435                        struct timeval request_time,
2436                        struct timeval timeout,
2437                        struct smb_request *req,
2438                        bool delayed_for_oplocks,
2439                        struct file_id id)
2440 {
2441         struct deferred_open_record *open_rec = NULL;
2442         struct timeval abs_timeout;
2443         struct defer_open_state *watch_state;
2444         struct tevent_req *watch_req;
2445         bool ok;
2446
2447         abs_timeout = timeval_sum(&request_time, &timeout);
2448
2449         DBG_DEBUG("request time [%s] timeout [%s] mid [%" PRIu64 "] "
2450                   "delayed_for_oplocks [%s] file_id [%s]\n",
2451                   timeval_string(talloc_tos(), &request_time, false),
2452                   timeval_string(talloc_tos(), &abs_timeout, false),
2453                   req->mid,
2454                   delayed_for_oplocks ? "yes" : "no",
2455                   file_id_string_tos(&id));
2456
2457         open_rec = deferred_open_record_create(delayed_for_oplocks,
2458                                                false,
2459                                                id);
2460         if (open_rec == NULL) {
2461                 TALLOC_FREE(lck);
2462                 exit_server("talloc failed");
2463         }
2464
2465         watch_state = talloc(open_rec, struct defer_open_state);
2466         if (watch_state == NULL) {
2467                 exit_server("talloc failed");
2468         }
2469         watch_state->xconn = req->xconn;
2470         watch_state->mid = req->mid;
2471
2472         DBG_DEBUG("defering mid %" PRIu64 "\n", req->mid);
2473
2474         watch_req = dbwrap_watched_watch_send(watch_state,
2475                                               req->sconn->ev_ctx,
2476                                               lck->data->record,
2477                                               (struct server_id){0});
2478         if (watch_req == NULL) {
2479                 exit_server("Could not watch share mode record");
2480         }
2481         tevent_req_set_callback(watch_req, defer_open_done, watch_state);
2482
2483         ok = tevent_req_set_endtime(watch_req, req->sconn->ev_ctx, abs_timeout);
2484         if (!ok) {
2485                 exit_server("tevent_req_set_endtime failed");
2486         }
2487
2488         ok = push_deferred_open_message_smb(req, request_time, timeout,
2489                                             open_rec->id, open_rec);
2490         if (!ok) {
2491                 TALLOC_FREE(lck);
2492                 exit_server("push_deferred_open_message_smb failed");
2493         }
2494 }
2495
2496 static void defer_open_done(struct tevent_req *req)
2497 {
2498         struct defer_open_state *state = tevent_req_callback_data(
2499                 req, struct defer_open_state);
2500         NTSTATUS status;
2501         bool ret;
2502
2503         status = dbwrap_watched_watch_recv(req, NULL, NULL);
2504         TALLOC_FREE(req);
2505         if (!NT_STATUS_IS_OK(status)) {
2506                 DEBUG(5, ("dbwrap_watched_watch_recv returned %s\n",
2507                           nt_errstr(status)));
2508                 /*
2509                  * Even if it failed, retry anyway. TODO: We need a way to
2510                  * tell a re-scheduled open about that error.
2511                  */
2512         }
2513
2514         DEBUG(10, ("scheduling mid %llu\n", (unsigned long long)state->mid));
2515
2516         ret = schedule_deferred_open_message_smb(state->xconn, state->mid);
2517         SMB_ASSERT(ret);
2518         TALLOC_FREE(state);
2519 }
2520
2521 /**
2522  * Actually attempt the kernel oplock polling open.
2523  */
2524
2525 static void kernel_oplock_poll_open_timer(struct tevent_context *ev,
2526                                       struct tevent_timer *te,
2527                                       struct timeval current_time,
2528                                       void *private_data)
2529 {
2530         bool ok;
2531         struct smb_request *req = (struct smb_request *)private_data;
2532
2533         ok = schedule_deferred_open_message_smb(req->xconn, req->mid);
2534         if (!ok) {
2535                 exit_server("schedule_deferred_open_message_smb failed");
2536         }
2537         DBG_DEBUG("kernel_oplock_poll_open_timer fired. Retying open !\n");
2538 }
2539
2540 /**
2541  * Reschedule an open for 1 second from now, if not timed out.
2542  **/
2543 static void setup_kernel_oplock_poll_open(struct timeval request_time,
2544                        struct smb_request *req,
2545                        struct file_id id)
2546 {
2547
2548         bool ok;
2549         struct deferred_open_record *open_rec = NULL;
2550         /* Maximum wait time. */
2551         struct timeval timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2552
2553         if (request_timed_out(request_time, timeout)) {
2554                 return;
2555         }
2556
2557         open_rec = deferred_open_record_create(false, false, id);
2558         if (open_rec == NULL) {
2559                 exit_server("talloc failed");
2560         }
2561
2562         ok = push_deferred_open_message_smb(req,
2563                                             request_time,
2564                                             timeout,
2565                                             id,
2566                                             open_rec);
2567         if (!ok) {
2568                 exit_server("push_deferred_open_message_smb failed");
2569         }
2570
2571         /*
2572          * As this timer event is owned by req, it will
2573          * disappear if req it talloc_freed.
2574          */
2575         open_rec->te = tevent_add_timer(req->sconn->ev_ctx,
2576                                         req,
2577                                         timeval_current_ofs(1, 0),
2578                                         kernel_oplock_poll_open_timer,
2579                                         req);
2580         if (open_rec->te == NULL) {
2581                 exit_server("tevent_add_timer failed");
2582         }
2583
2584         DBG_DEBUG("poll request time [%s] mid [%" PRIu64 "] file_id [%s]\n",
2585                   timeval_string(talloc_tos(), &request_time, false),
2586                   req->mid,
2587                   file_id_string_tos(&id));
2588 }
2589
2590 /****************************************************************************
2591  On overwrite open ensure that the attributes match.
2592 ****************************************************************************/
2593
2594 static bool open_match_attributes(connection_struct *conn,
2595                                   uint32_t old_dos_attr,
2596                                   uint32_t new_dos_attr,
2597                                   mode_t new_unx_mode,
2598                                   mode_t *returned_unx_mode)
2599 {
2600         uint32_t noarch_old_dos_attr, noarch_new_dos_attr;
2601
2602         noarch_old_dos_attr = (old_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
2603         noarch_new_dos_attr = (new_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
2604
2605         if((noarch_old_dos_attr == 0 && noarch_new_dos_attr != 0) || 
2606            (noarch_old_dos_attr != 0 && ((noarch_old_dos_attr & noarch_new_dos_attr) == noarch_old_dos_attr))) {
2607                 *returned_unx_mode = new_unx_mode;
2608         } else {
2609                 *returned_unx_mode = (mode_t)0;
2610         }
2611
2612         DEBUG(10,("open_match_attributes: old_dos_attr = 0x%x, "
2613                   "new_dos_attr = 0x%x "
2614                   "returned_unx_mode = 0%o\n",
2615                   (unsigned int)old_dos_attr,
2616                   (unsigned int)new_dos_attr,
2617                   (unsigned int)*returned_unx_mode ));
2618
2619         /* If we're mapping SYSTEM and HIDDEN ensure they match. */
2620         if (lp_map_system(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2621                 if ((old_dos_attr & FILE_ATTRIBUTE_SYSTEM) &&
2622                     !(new_dos_attr & FILE_ATTRIBUTE_SYSTEM)) {
2623                         return False;
2624                 }
2625         }
2626         if (lp_map_hidden(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2627                 if ((old_dos_attr & FILE_ATTRIBUTE_HIDDEN) &&
2628                     !(new_dos_attr & FILE_ATTRIBUTE_HIDDEN)) {
2629                         return False;
2630                 }
2631         }
2632         return True;
2633 }
2634
2635 /****************************************************************************
2636  Special FCB or DOS processing in the case of a sharing violation.
2637  Try and find a duplicated file handle.
2638 ****************************************************************************/
2639
2640 static NTSTATUS fcb_or_dos_open(struct smb_request *req,
2641                                 connection_struct *conn,
2642                                 files_struct *fsp_to_dup_into,
2643                                 const struct smb_filename *smb_fname,
2644                                 struct file_id id,
2645                                 uint16_t file_pid,
2646                                 uint64_t vuid,
2647                                 uint32_t access_mask,
2648                                 uint32_t share_access,
2649                                 uint32_t create_options)
2650 {
2651         files_struct *fsp;
2652
2653         DEBUG(5,("fcb_or_dos_open: attempting old open semantics for "
2654                  "file %s.\n", smb_fname_str_dbg(smb_fname)));
2655
2656         for(fsp = file_find_di_first(conn->sconn, id); fsp;
2657             fsp = file_find_di_next(fsp)) {
2658
2659                 DEBUG(10,("fcb_or_dos_open: checking file %s, fd = %d, "
2660                           "vuid = %llu, file_pid = %u, private_options = 0x%x "
2661                           "access_mask = 0x%x\n", fsp_str_dbg(fsp),
2662                           fsp->fh->fd, (unsigned long long)fsp->vuid,
2663                           (unsigned int)fsp->file_pid,
2664                           (unsigned int)fsp->fh->private_options,
2665                           (unsigned int)fsp->access_mask ));
2666
2667                 if (fsp != fsp_to_dup_into &&
2668                     fsp->fh->fd != -1 &&
2669                     fsp->vuid == vuid &&
2670                     fsp->file_pid == file_pid &&
2671                     (fsp->fh->private_options & (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
2672                                                  NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
2673                     (fsp->access_mask & FILE_WRITE_DATA) &&
2674                     strequal(fsp->fsp_name->base_name, smb_fname->base_name) &&
2675                     strequal(fsp->fsp_name->stream_name,
2676                              smb_fname->stream_name)) {
2677                         DEBUG(10,("fcb_or_dos_open: file match\n"));
2678                         break;
2679                 }
2680         }
2681
2682         if (!fsp) {
2683                 return NT_STATUS_NOT_FOUND;
2684         }
2685
2686         /* quite an insane set of semantics ... */
2687         if (is_executable(smb_fname->base_name) &&
2688             (fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
2689                 DEBUG(10,("fcb_or_dos_open: file fail due to is_executable.\n"));
2690                 return NT_STATUS_INVALID_PARAMETER;
2691         }
2692
2693         /* We need to duplicate this fsp. */
2694         return dup_file_fsp(req, fsp, access_mask, share_access,
2695                             create_options, fsp_to_dup_into);
2696 }
2697
2698 static void schedule_defer_open(struct share_mode_lock *lck,
2699                                 struct file_id id,
2700                                 struct timeval request_time,
2701                                 struct smb_request *req)
2702 {
2703         /* This is a relative time, added to the absolute
2704            request_time value to get the absolute timeout time.
2705            Note that if this is the second or greater time we enter
2706            this codepath for this particular request mid then
2707            request_time is left as the absolute time of the *first*
2708            time this request mid was processed. This is what allows
2709            the request to eventually time out. */
2710
2711         struct timeval timeout;
2712
2713         /* Normally the smbd we asked should respond within
2714          * OPLOCK_BREAK_TIMEOUT seconds regardless of whether
2715          * the client did, give twice the timeout as a safety
2716          * measure here in case the other smbd is stuck
2717          * somewhere else. */
2718
2719         timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2720
2721         if (request_timed_out(request_time, timeout)) {
2722                 return;
2723         }
2724
2725         defer_open(lck, request_time, timeout, req, true, id);
2726 }
2727
2728 /****************************************************************************
2729  Reschedule an open call that went asynchronous.
2730 ****************************************************************************/
2731
2732 static void schedule_async_open_timer(struct tevent_context *ev,
2733                                       struct tevent_timer *te,
2734                                       struct timeval current_time,
2735                                       void *private_data)
2736 {
2737         exit_server("async open timeout");
2738 }
2739
2740 static void schedule_async_open(struct timeval request_time,
2741                                 struct smb_request *req)
2742 {
2743         struct deferred_open_record *open_rec = NULL;
2744         struct timeval timeout = timeval_set(20, 0);
2745         bool ok;
2746
2747         if (request_timed_out(request_time, timeout)) {
2748                 return;
2749         }
2750
2751         open_rec = deferred_open_record_create(false, true, (struct file_id){0});
2752         if (open_rec == NULL) {
2753                 exit_server("deferred_open_record_create failed");
2754         }
2755
2756         ok = push_deferred_open_message_smb(req, request_time, timeout,
2757                                             (struct file_id){0}, open_rec);
2758         if (!ok) {
2759                 exit_server("push_deferred_open_message_smb failed");
2760         }
2761
2762         open_rec->te = tevent_add_timer(req->sconn->ev_ctx,
2763                                         req,
2764                                         timeval_current_ofs(20, 0),
2765                                         schedule_async_open_timer,
2766                                         open_rec);
2767         if (open_rec->te == NULL) {
2768                 exit_server("tevent_add_timer failed");
2769         }
2770 }
2771
2772 /****************************************************************************
2773  Work out what access_mask to use from what the client sent us.
2774 ****************************************************************************/
2775
2776 static NTSTATUS smbd_calculate_maximum_allowed_access(
2777         connection_struct *conn,
2778         const struct smb_filename *smb_fname,
2779         bool use_privs,
2780         uint32_t *p_access_mask)
2781 {
2782         struct security_descriptor *sd;
2783         uint32_t access_granted;
2784         NTSTATUS status;
2785
2786         if (!use_privs && (get_current_uid(conn) == (uid_t)0)) {
2787                 *p_access_mask |= FILE_GENERIC_ALL;
2788                 return NT_STATUS_OK;
2789         }
2790
2791         status = SMB_VFS_GET_NT_ACL(conn, smb_fname,
2792                                     (SECINFO_OWNER |
2793                                      SECINFO_GROUP |
2794                                      SECINFO_DACL),
2795                                     talloc_tos(), &sd);
2796
2797         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
2798                 /*
2799                  * File did not exist
2800                  */
2801                 *p_access_mask = FILE_GENERIC_ALL;
2802                 return NT_STATUS_OK;
2803         }
2804         if (!NT_STATUS_IS_OK(status)) {
2805                 DEBUG(10,("Could not get acl on file %s: %s\n",
2806                           smb_fname_str_dbg(smb_fname),
2807                           nt_errstr(status)));
2808                 return NT_STATUS_ACCESS_DENIED;
2809         }
2810
2811         /*
2812          * If we can access the path to this file, by
2813          * default we have FILE_READ_ATTRIBUTES from the
2814          * containing directory. See the section:
2815          * "Algorithm to Check Access to an Existing File"
2816          * in MS-FSA.pdf.
2817          *
2818          * se_file_access_check()
2819          * also takes care of owner WRITE_DAC and READ_CONTROL.
2820          */
2821         status = se_file_access_check(sd,
2822                                  get_current_nttok(conn),
2823                                  use_privs,
2824                                  (*p_access_mask & ~FILE_READ_ATTRIBUTES),
2825                                  &access_granted);
2826
2827         TALLOC_FREE(sd);
2828
2829         if (!NT_STATUS_IS_OK(status)) {
2830                 DEBUG(10, ("Access denied on file %s: "
2831                            "when calculating maximum access\n",
2832                            smb_fname_str_dbg(smb_fname)));
2833                 return NT_STATUS_ACCESS_DENIED;
2834         }
2835         *p_access_mask = (access_granted | FILE_READ_ATTRIBUTES);
2836
2837         if (!(access_granted & DELETE_ACCESS)) {
2838                 if (can_delete_file_in_directory(conn, smb_fname)) {
2839                         *p_access_mask |= DELETE_ACCESS;
2840                 }
2841         }
2842
2843         return NT_STATUS_OK;
2844 }
2845
2846 NTSTATUS smbd_calculate_access_mask(connection_struct *conn,
2847                                     const struct smb_filename *smb_fname,
2848                                     bool use_privs,
2849                                     uint32_t access_mask,
2850                                     uint32_t *access_mask_out)
2851 {
2852         NTSTATUS status;
2853         uint32_t orig_access_mask = access_mask;
2854         uint32_t rejected_share_access;
2855
2856         if (access_mask & SEC_MASK_INVALID) {
2857                 DBG_DEBUG("access_mask [%8x] contains invalid bits\n",
2858                           access_mask);
2859                 return NT_STATUS_ACCESS_DENIED;
2860         }
2861
2862         /*
2863          * Convert GENERIC bits to specific bits.
2864          */
2865
2866         se_map_generic(&access_mask, &file_generic_mapping);
2867
2868         /* Calculate MAXIMUM_ALLOWED_ACCESS if requested. */
2869         if (access_mask & MAXIMUM_ALLOWED_ACCESS) {
2870
2871                 status = smbd_calculate_maximum_allowed_access(
2872                         conn, smb_fname, use_privs, &access_mask);
2873
2874                 if (!NT_STATUS_IS_OK(status)) {
2875                         return status;
2876                 }
2877
2878                 access_mask &= conn->share_access;
2879         }
2880
2881         rejected_share_access = access_mask & ~(conn->share_access);
2882
2883         if (rejected_share_access) {
2884                 DEBUG(10, ("smbd_calculate_access_mask: Access denied on "
2885                         "file %s: rejected by share access mask[0x%08X] "
2886                         "orig[0x%08X] mapped[0x%08X] reject[0x%08X]\n",
2887                         smb_fname_str_dbg(smb_fname),
2888                         conn->share_access,
2889                         orig_access_mask, access_mask,
2890                         rejected_share_access));
2891                 return NT_STATUS_ACCESS_DENIED;
2892         }
2893
2894         *access_mask_out = access_mask;
2895         return NT_STATUS_OK;
2896 }
2897
2898 /****************************************************************************
2899  Remove the deferred open entry under lock.
2900 ****************************************************************************/
2901
2902 /****************************************************************************
2903  Return true if this is a state pointer to an asynchronous create.
2904 ****************************************************************************/
2905
2906 bool is_deferred_open_async(const struct deferred_open_record *rec)
2907 {
2908         return rec->async_open;
2909 }
2910
2911 static bool clear_ads(uint32_t create_disposition)
2912 {
2913         bool ret = false;
2914
2915         switch (create_disposition) {
2916         case FILE_SUPERSEDE:
2917         case FILE_OVERWRITE_IF:
2918         case FILE_OVERWRITE:
2919                 ret = true;
2920                 break;
2921         default:
2922                 break;
2923         }
2924         return ret;
2925 }
2926
2927 static int disposition_to_open_flags(uint32_t create_disposition)
2928 {
2929         int ret = 0;
2930
2931         /*
2932          * Currently we're using FILE_SUPERSEDE as the same as
2933          * FILE_OVERWRITE_IF but they really are
2934          * different. FILE_SUPERSEDE deletes an existing file
2935          * (requiring delete access) then recreates it.
2936          */
2937
2938         switch (create_disposition) {
2939         case FILE_SUPERSEDE:
2940         case FILE_OVERWRITE_IF:
2941                 /*
2942                  * If file exists replace/overwrite. If file doesn't
2943                  * exist create.
2944                  */
2945                 ret = O_CREAT|O_TRUNC;
2946                 break;
2947
2948         case FILE_OPEN:
2949                 /*
2950                  * If file exists open. If file doesn't exist error.
2951                  */
2952                 ret = 0;
2953                 break;
2954
2955         case FILE_OVERWRITE:
2956                 /*
2957                  * If file exists overwrite. If file doesn't exist
2958                  * error.
2959                  */
2960                 ret = O_TRUNC;
2961                 break;
2962
2963         case FILE_CREATE:
2964                 /*
2965                  * If file exists error. If file doesn't exist create.
2966                  */
2967                 ret = O_CREAT|O_EXCL;
2968                 break;
2969
2970         case FILE_OPEN_IF:
2971                 /*
2972                  * If file exists open. If file doesn't exist create.
2973                  */
2974                 ret = O_CREAT;
2975                 break;
2976         }
2977         return ret;
2978 }
2979
2980 static int calculate_open_access_flags(uint32_t access_mask,
2981                                        uint32_t private_flags)
2982 {
2983         bool need_write, need_read;
2984
2985         /*
2986          * Note that we ignore the append flag as append does not
2987          * mean the same thing under DOS and Unix.
2988          */
2989
2990         need_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA));
2991         if (!need_write) {
2992                 return O_RDONLY;
2993         }
2994
2995         /* DENY_DOS opens are always underlying read-write on the
2996            file handle, no matter what the requested access mask
2997            says. */
2998
2999         need_read =
3000                 ((private_flags & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS) ||
3001                  access_mask & (FILE_READ_ATTRIBUTES|FILE_READ_DATA|
3002                                 FILE_READ_EA|FILE_EXECUTE));
3003
3004         if (!need_read) {
3005                 return O_WRONLY;
3006         }
3007         return O_RDWR;
3008 }
3009
3010 /****************************************************************************
3011  Open a file with a share mode. Passed in an already created files_struct *.
3012 ****************************************************************************/
3013
3014 static NTSTATUS open_file_ntcreate(connection_struct *conn,
3015                             struct smb_request *req,
3016                             uint32_t access_mask,               /* access bits (FILE_READ_DATA etc.) */
3017                             uint32_t share_access,      /* share constants (FILE_SHARE_READ etc) */
3018                             uint32_t create_disposition,        /* FILE_OPEN_IF etc. */
3019                             uint32_t create_options,    /* options such as delete on close. */
3020                             uint32_t new_dos_attributes,        /* attributes used for new file. */
3021                             int oplock_request,         /* internal Samba oplock codes. */
3022                             struct smb2_lease *lease,
3023                                                         /* Information (FILE_EXISTS etc.) */
3024                             uint32_t private_flags,     /* Samba specific flags. */
3025                             int *pinfo,
3026                             files_struct *fsp)
3027 {