smbd: Don't pass up lease_idx from grant_fsp_lease
[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 granted)
2046 {
2047         struct share_mode_data *d = lck->data;
2048         const struct GUID *client_guid = fsp_client_guid(fsp);
2049         struct share_mode_lease *tmp;
2050         NTSTATUS status;
2051         int idx;
2052
2053         idx = find_share_mode_lease(d, client_guid, &lease->lease_key);
2054
2055         if (idx != -1) {
2056                 struct share_mode_lease *l = &d->leases[idx];
2057                 bool do_upgrade;
2058                 uint32_t existing, requested;
2059
2060                 fsp->lease = find_fsp_lease(
2061                         fsp,
2062                         &lease->lease_key,
2063                         l->current_state,
2064                         l->lease_version,
2065                         l->epoch);
2066                 if (fsp->lease == NULL) {
2067                         DEBUG(1, ("Did not find existing lease for file %s\n",
2068                                   fsp_str_dbg(fsp)));
2069                         return NT_STATUS_NO_MEMORY;
2070                 }
2071
2072                 /*
2073                  * Upgrade only if the requested lease is a strict upgrade.
2074                  */
2075                 existing = l->current_state;
2076                 requested = lease->lease_state;
2077
2078                 /*
2079                  * Tricky: This test makes sure that "requested" is a
2080                  * strict bitwise superset of "existing".
2081                  */
2082                 do_upgrade = ((existing & requested) == existing);
2083
2084                 /*
2085                  * Upgrade only if there's a change.
2086                  */
2087                 do_upgrade &= (granted != existing);
2088
2089                 /*
2090                  * Upgrade only if other leases don't prevent what was asked
2091                  * for.
2092                  */
2093                 do_upgrade &= (granted == requested);
2094
2095                 /*
2096                  * only upgrade if we are not in breaking state
2097                  */
2098                 do_upgrade &= !l->breaking;
2099
2100                 DEBUG(10, ("existing=%"PRIu32", requested=%"PRIu32", "
2101                            "granted=%"PRIu32", do_upgrade=%d\n",
2102                            existing, requested, granted, (int)do_upgrade));
2103
2104                 if (do_upgrade) {
2105                         l->current_state = granted;
2106                         l->epoch += 1;
2107                 }
2108
2109                 {
2110                         NTSTATUS set_status;
2111
2112                         set_status = leases_db_set(
2113                                 client_guid,
2114                                 &lease->lease_key,
2115                                 l->current_state,
2116                                 l->breaking,
2117                                 l->breaking_to_requested,
2118                                 l->breaking_to_required,
2119                                 l->lease_version,
2120                                 l->epoch);
2121
2122                         if (!NT_STATUS_IS_OK(set_status)) {
2123                                 DBG_DEBUG("leases_db_set failed: %s\n",
2124                                           nt_errstr(set_status));
2125                                 return set_status;
2126                         }
2127                 }
2128
2129                 /* Ensure we're in sync with current lease state. */
2130                 fsp_lease_update(lck, fsp_client_guid(fsp), fsp->lease);
2131                 return NT_STATUS_OK;
2132         }
2133
2134         /*
2135          * Create new lease
2136          */
2137
2138         tmp = talloc_realloc(d, d->leases, struct share_mode_lease,
2139                              d->num_leases+1);
2140         if (tmp == NULL) {
2141                 /*
2142                  * See [MS-SMB2]
2143                  */
2144                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2145         }
2146         d->leases = tmp;
2147
2148         fsp->lease = talloc_zero(fsp->conn->sconn, struct fsp_lease);
2149         if (fsp->lease == NULL) {
2150                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2151         }
2152         fsp->lease->ref_count = 1;
2153         fsp->lease->sconn = fsp->conn->sconn;
2154         fsp->lease->lease.lease_version = lease->lease_version;
2155         fsp->lease->lease.lease_key = lease->lease_key;
2156         fsp->lease->lease.lease_state = granted;
2157         fsp->lease->lease.lease_epoch = lease->lease_epoch + 1;
2158
2159         d->leases[d->num_leases] = (struct share_mode_lease) {
2160                 .client_guid = *client_guid,
2161                 .lease_key = fsp->lease->lease.lease_key,
2162                 .current_state = fsp->lease->lease.lease_state,
2163                 .lease_version = fsp->lease->lease.lease_version,
2164                 .epoch = fsp->lease->lease.lease_epoch,
2165         };
2166
2167         status = leases_db_add(client_guid,
2168                                &lease->lease_key,
2169                                &fsp->file_id,
2170                                fsp->lease->lease.lease_state,
2171                                fsp->lease->lease.lease_version,
2172                                fsp->lease->lease.lease_epoch,
2173                                fsp->conn->connectpath,
2174                                fsp->fsp_name->base_name,
2175                                fsp->fsp_name->stream_name);
2176         if (!NT_STATUS_IS_OK(status)) {
2177                 DEBUG(10, ("%s: leases_db_add failed: %s\n", __func__,
2178                            nt_errstr(status)));
2179                 TALLOC_FREE(fsp->lease);
2180                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2181         }
2182
2183         d->num_leases += 1;
2184         d->modified = true;
2185
2186         return NT_STATUS_OK;
2187 }
2188
2189 static bool is_same_lease(const files_struct *fsp,
2190                           const struct share_mode_data *d,
2191                           const struct share_mode_entry *e,
2192                           const struct smb2_lease *lease)
2193 {
2194         if (e->op_type != LEASE_OPLOCK) {
2195                 return false;
2196         }
2197         if (lease == NULL) {
2198                 return false;
2199         }
2200
2201         return smb2_lease_equal(fsp_client_guid(fsp),
2202                                 &lease->lease_key,
2203                                 &e->client_guid,
2204                                 &e->lease_key);
2205 }
2206
2207 static int map_lease_type_to_oplock(uint32_t lease_type)
2208 {
2209         int result = NO_OPLOCK;
2210
2211         switch (lease_type) {
2212         case SMB2_LEASE_READ|SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE:
2213                 result = BATCH_OPLOCK|EXCLUSIVE_OPLOCK;
2214                 break;
2215         case SMB2_LEASE_READ|SMB2_LEASE_WRITE:
2216                 result = EXCLUSIVE_OPLOCK;
2217                 break;
2218         case SMB2_LEASE_READ|SMB2_LEASE_HANDLE:
2219         case SMB2_LEASE_READ:
2220                 result = LEVEL_II_OPLOCK;
2221                 break;
2222         }
2223
2224         return result;
2225 }
2226
2227 static NTSTATUS grant_fsp_oplock_type(struct smb_request *req,
2228                                       struct files_struct *fsp,
2229                                       struct share_mode_lock *lck,
2230                                       int oplock_request,
2231                                       struct smb2_lease *lease)
2232 {
2233         struct share_mode_data *d = lck->data;
2234         bool got_handle_lease = false;
2235         bool got_oplock = false;
2236         uint32_t i;
2237         uint32_t granted;
2238         const struct GUID *client_guid = NULL;
2239         const struct smb2_lease_key *lease_key = NULL;
2240         bool ok;
2241         NTSTATUS status;
2242
2243         if (oplock_request & INTERNAL_OPEN_ONLY) {
2244                 /* No oplocks on internal open. */
2245                 oplock_request = NO_OPLOCK;
2246                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
2247                         fsp->oplock_type, fsp_str_dbg(fsp)));
2248         }
2249
2250         if (oplock_request == LEASE_OPLOCK) {
2251                 if (lease == NULL) {
2252                         /*
2253                          * The SMB2 layer should have checked this
2254                          */
2255                         return NT_STATUS_INTERNAL_ERROR;
2256                 }
2257
2258                 granted = lease->lease_state;
2259
2260                 if (lp_kernel_oplocks(SNUM(fsp->conn))) {
2261                         DEBUG(10, ("No lease granted because kernel oplocks are enabled\n"));
2262                         granted = SMB2_LEASE_NONE;
2263                 }
2264                 if ((granted & (SMB2_LEASE_READ|SMB2_LEASE_WRITE)) == 0) {
2265                         DEBUG(10, ("No read or write lease requested\n"));
2266                         granted = SMB2_LEASE_NONE;
2267                 }
2268                 if (granted == SMB2_LEASE_WRITE) {
2269                         DEBUG(10, ("pure write lease requested\n"));
2270                         granted = SMB2_LEASE_NONE;
2271                 }
2272                 if (granted == (SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE)) {
2273                         DEBUG(10, ("write and handle lease requested\n"));
2274                         granted = SMB2_LEASE_NONE;
2275                 }
2276         } else {
2277                 granted = map_oplock_to_lease_type(
2278                         oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
2279         }
2280
2281         if (lp_locking(fsp->conn->params) && file_has_brlocks(fsp)) {
2282                 DEBUG(10,("grant_fsp_oplock_type: file %s has byte range locks\n",
2283                         fsp_str_dbg(fsp)));
2284                 granted &= ~SMB2_LEASE_READ;
2285         }
2286
2287         for (i=0; i<d->num_share_modes; i++) {
2288                 struct share_mode_entry *e = &d->share_modes[i];
2289                 uint32_t e_lease_type;
2290
2291                 e_lease_type = get_lease_type(d, e);
2292
2293                 if ((granted & SMB2_LEASE_WRITE) &&
2294                     !is_same_lease(fsp, d, e, lease) &&
2295                     !share_mode_stale_pid(d, i)) {
2296                         /*
2297                          * Can grant only one writer
2298                          */
2299                         granted &= ~SMB2_LEASE_WRITE;
2300                 }
2301
2302                 if ((e_lease_type & SMB2_LEASE_HANDLE) && !got_handle_lease &&
2303                     !share_mode_stale_pid(d, i)) {
2304                         got_handle_lease = true;
2305                 }
2306
2307                 if ((e->op_type != LEASE_OPLOCK) && !got_oplock &&
2308                     !share_mode_stale_pid(d, i)) {
2309                         got_oplock = true;
2310                 }
2311         }
2312
2313         if ((granted & SMB2_LEASE_READ) && !(granted & SMB2_LEASE_WRITE)) {
2314                 bool allow_level2 =
2315                         (global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
2316                         lp_level2_oplocks(SNUM(fsp->conn));
2317
2318                 if (!allow_level2) {
2319                         granted = SMB2_LEASE_NONE;
2320                 }
2321         }
2322
2323         if (oplock_request == LEASE_OPLOCK) {
2324                 if (got_oplock) {
2325                         granted &= ~SMB2_LEASE_HANDLE;
2326                 }
2327
2328                 fsp->oplock_type = LEASE_OPLOCK;
2329
2330                 status = grant_fsp_lease(fsp, lck, lease, granted);
2331                 if (!NT_STATUS_IS_OK(status)) {
2332                         return status;
2333
2334                 }
2335                 *lease = fsp->lease->lease;
2336
2337                 lease_key = &fsp->lease->lease.lease_key;
2338                 client_guid = fsp_client_guid(fsp);
2339
2340                 DEBUG(10, ("lease_state=%d\n", lease->lease_state));
2341         } else {
2342                 if (got_handle_lease) {
2343                         granted = SMB2_LEASE_NONE;
2344                 }
2345
2346                 fsp->oplock_type = map_lease_type_to_oplock(granted);
2347
2348                 status = set_file_oplock(fsp);
2349                 if (!NT_STATUS_IS_OK(status)) {
2350                         /*
2351                          * Could not get the kernel oplock
2352                          */
2353                         fsp->oplock_type = NO_OPLOCK;
2354                 }
2355         }
2356
2357         ok = set_share_mode(
2358                 lck,
2359                 fsp,
2360                 get_current_uid(fsp->conn),
2361                 req ? req->mid : 0,
2362                 fsp->oplock_type,
2363                 client_guid,
2364                 lease_key);
2365         if (!ok) {
2366                 return NT_STATUS_NO_MEMORY;
2367         }
2368
2369         ok = update_num_read_oplocks(fsp, lck);
2370         if (!ok) {
2371                 del_share_mode(lck, fsp);
2372                 return NT_STATUS_INTERNAL_ERROR;
2373         }
2374
2375         DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
2376                   fsp->oplock_type, fsp_str_dbg(fsp)));
2377
2378         return NT_STATUS_OK;
2379 }
2380
2381 static bool request_timed_out(struct timeval request_time,
2382                               struct timeval timeout)
2383 {
2384         struct timeval now, end_time;
2385         GetTimeOfDay(&now);
2386         end_time = timeval_sum(&request_time, &timeout);
2387         return (timeval_compare(&end_time, &now) < 0);
2388 }
2389
2390 static struct deferred_open_record *deferred_open_record_create(
2391         bool delayed_for_oplocks,
2392         bool async_open,
2393         struct file_id id)
2394 {
2395         struct deferred_open_record *record = NULL;
2396
2397         record = talloc(NULL, struct deferred_open_record);
2398         if (record == NULL) {
2399                 return NULL;
2400         }
2401
2402         *record = (struct deferred_open_record) {
2403                 .delayed_for_oplocks = delayed_for_oplocks,
2404                 .async_open = async_open,
2405                 .id = id,
2406         };
2407
2408         return record;
2409 }
2410
2411 struct defer_open_state {
2412         struct smbXsrv_connection *xconn;
2413         uint64_t mid;
2414 };
2415
2416 static void defer_open_done(struct tevent_req *req);
2417
2418 /**
2419  * Defer an open and watch a locking.tdb record
2420  *
2421  * This defers an open that gets rescheduled once the locking.tdb record watch
2422  * is triggered by a change to the record.
2423  *
2424  * It is used to defer opens that triggered an oplock break and for the SMB1
2425  * sharing violation delay.
2426  **/
2427 static void defer_open(struct share_mode_lock *lck,
2428                        struct timeval request_time,
2429                        struct timeval timeout,
2430                        struct smb_request *req,
2431                        bool delayed_for_oplocks,
2432                        struct file_id id)
2433 {
2434         struct deferred_open_record *open_rec = NULL;
2435         struct timeval abs_timeout;
2436         struct defer_open_state *watch_state;
2437         struct tevent_req *watch_req;
2438         bool ok;
2439
2440         abs_timeout = timeval_sum(&request_time, &timeout);
2441
2442         DBG_DEBUG("request time [%s] timeout [%s] mid [%" PRIu64 "] "
2443                   "delayed_for_oplocks [%s] file_id [%s]\n",
2444                   timeval_string(talloc_tos(), &request_time, false),
2445                   timeval_string(talloc_tos(), &abs_timeout, false),
2446                   req->mid,
2447                   delayed_for_oplocks ? "yes" : "no",
2448                   file_id_string_tos(&id));
2449
2450         open_rec = deferred_open_record_create(delayed_for_oplocks,
2451                                                false,
2452                                                id);
2453         if (open_rec == NULL) {
2454                 TALLOC_FREE(lck);
2455                 exit_server("talloc failed");
2456         }
2457
2458         watch_state = talloc(open_rec, struct defer_open_state);
2459         if (watch_state == NULL) {
2460                 exit_server("talloc failed");
2461         }
2462         watch_state->xconn = req->xconn;
2463         watch_state->mid = req->mid;
2464
2465         DBG_DEBUG("defering mid %" PRIu64 "\n", req->mid);
2466
2467         watch_req = dbwrap_watched_watch_send(watch_state,
2468                                               req->sconn->ev_ctx,
2469                                               lck->data->record,
2470                                               (struct server_id){0});
2471         if (watch_req == NULL) {
2472                 exit_server("Could not watch share mode record");
2473         }
2474         tevent_req_set_callback(watch_req, defer_open_done, watch_state);
2475
2476         ok = tevent_req_set_endtime(watch_req, req->sconn->ev_ctx, abs_timeout);
2477         if (!ok) {
2478                 exit_server("tevent_req_set_endtime failed");
2479         }
2480
2481         ok = push_deferred_open_message_smb(req, request_time, timeout,
2482                                             open_rec->id, open_rec);
2483         if (!ok) {
2484                 TALLOC_FREE(lck);
2485                 exit_server("push_deferred_open_message_smb failed");
2486         }
2487 }
2488
2489 static void defer_open_done(struct tevent_req *req)
2490 {
2491         struct defer_open_state *state = tevent_req_callback_data(
2492                 req, struct defer_open_state);
2493         NTSTATUS status;
2494         bool ret;
2495
2496         status = dbwrap_watched_watch_recv(req, NULL, NULL);
2497         TALLOC_FREE(req);
2498         if (!NT_STATUS_IS_OK(status)) {
2499                 DEBUG(5, ("dbwrap_watched_watch_recv returned %s\n",
2500                           nt_errstr(status)));
2501                 /*
2502                  * Even if it failed, retry anyway. TODO: We need a way to
2503                  * tell a re-scheduled open about that error.
2504                  */
2505         }
2506
2507         DEBUG(10, ("scheduling mid %llu\n", (unsigned long long)state->mid));
2508
2509         ret = schedule_deferred_open_message_smb(state->xconn, state->mid);
2510         SMB_ASSERT(ret);
2511         TALLOC_FREE(state);
2512 }
2513
2514 /**
2515  * Actually attempt the kernel oplock polling open.
2516  */
2517
2518 static void kernel_oplock_poll_open_timer(struct tevent_context *ev,
2519                                       struct tevent_timer *te,
2520                                       struct timeval current_time,
2521                                       void *private_data)
2522 {
2523         bool ok;
2524         struct smb_request *req = (struct smb_request *)private_data;
2525
2526         ok = schedule_deferred_open_message_smb(req->xconn, req->mid);
2527         if (!ok) {
2528                 exit_server("schedule_deferred_open_message_smb failed");
2529         }
2530         DBG_DEBUG("kernel_oplock_poll_open_timer fired. Retying open !\n");
2531 }
2532
2533 /**
2534  * Reschedule an open for 1 second from now, if not timed out.
2535  **/
2536 static void setup_kernel_oplock_poll_open(struct timeval request_time,
2537                        struct smb_request *req,
2538                        struct file_id id)
2539 {
2540
2541         bool ok;
2542         struct deferred_open_record *open_rec = NULL;
2543         /* Maximum wait time. */
2544         struct timeval timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2545
2546         if (request_timed_out(request_time, timeout)) {
2547                 return;
2548         }
2549
2550         open_rec = deferred_open_record_create(false, false, id);
2551         if (open_rec == NULL) {
2552                 exit_server("talloc failed");
2553         }
2554
2555         ok = push_deferred_open_message_smb(req,
2556                                             request_time,
2557                                             timeout,
2558                                             id,
2559                                             open_rec);
2560         if (!ok) {
2561                 exit_server("push_deferred_open_message_smb failed");
2562         }
2563
2564         /*
2565          * As this timer event is owned by req, it will
2566          * disappear if req it talloc_freed.
2567          */
2568         open_rec->te = tevent_add_timer(req->sconn->ev_ctx,
2569                                         req,
2570                                         timeval_current_ofs(1, 0),
2571                                         kernel_oplock_poll_open_timer,
2572                                         req);
2573         if (open_rec->te == NULL) {
2574                 exit_server("tevent_add_timer failed");
2575         }
2576
2577         DBG_DEBUG("poll request time [%s] mid [%" PRIu64 "] file_id [%s]\n",
2578                   timeval_string(talloc_tos(), &request_time, false),
2579                   req->mid,
2580                   file_id_string_tos(&id));
2581 }
2582
2583 /****************************************************************************
2584  On overwrite open ensure that the attributes match.
2585 ****************************************************************************/
2586
2587 static bool open_match_attributes(connection_struct *conn,
2588                                   uint32_t old_dos_attr,
2589                                   uint32_t new_dos_attr,
2590                                   mode_t new_unx_mode,
2591                                   mode_t *returned_unx_mode)
2592 {
2593         uint32_t noarch_old_dos_attr, noarch_new_dos_attr;
2594
2595         noarch_old_dos_attr = (old_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
2596         noarch_new_dos_attr = (new_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
2597
2598         if((noarch_old_dos_attr == 0 && noarch_new_dos_attr != 0) || 
2599            (noarch_old_dos_attr != 0 && ((noarch_old_dos_attr & noarch_new_dos_attr) == noarch_old_dos_attr))) {
2600                 *returned_unx_mode = new_unx_mode;
2601         } else {
2602                 *returned_unx_mode = (mode_t)0;
2603         }
2604
2605         DEBUG(10,("open_match_attributes: old_dos_attr = 0x%x, "
2606                   "new_dos_attr = 0x%x "
2607                   "returned_unx_mode = 0%o\n",
2608                   (unsigned int)old_dos_attr,
2609                   (unsigned int)new_dos_attr,
2610                   (unsigned int)*returned_unx_mode ));
2611
2612         /* If we're mapping SYSTEM and HIDDEN ensure they match. */
2613         if (lp_map_system(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2614                 if ((old_dos_attr & FILE_ATTRIBUTE_SYSTEM) &&
2615                     !(new_dos_attr & FILE_ATTRIBUTE_SYSTEM)) {
2616                         return False;
2617                 }
2618         }
2619         if (lp_map_hidden(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2620                 if ((old_dos_attr & FILE_ATTRIBUTE_HIDDEN) &&
2621                     !(new_dos_attr & FILE_ATTRIBUTE_HIDDEN)) {
2622                         return False;
2623                 }
2624         }
2625         return True;
2626 }
2627
2628 /****************************************************************************
2629  Special FCB or DOS processing in the case of a sharing violation.
2630  Try and find a duplicated file handle.
2631 ****************************************************************************/
2632
2633 static NTSTATUS fcb_or_dos_open(struct smb_request *req,
2634                                 connection_struct *conn,
2635                                 files_struct *fsp_to_dup_into,
2636                                 const struct smb_filename *smb_fname,
2637                                 struct file_id id,
2638                                 uint16_t file_pid,
2639                                 uint64_t vuid,
2640                                 uint32_t access_mask,
2641                                 uint32_t share_access,
2642                                 uint32_t create_options)
2643 {
2644         files_struct *fsp;
2645
2646         DEBUG(5,("fcb_or_dos_open: attempting old open semantics for "
2647                  "file %s.\n", smb_fname_str_dbg(smb_fname)));
2648
2649         for(fsp = file_find_di_first(conn->sconn, id); fsp;
2650             fsp = file_find_di_next(fsp)) {
2651
2652                 DEBUG(10,("fcb_or_dos_open: checking file %s, fd = %d, "
2653                           "vuid = %llu, file_pid = %u, private_options = 0x%x "
2654                           "access_mask = 0x%x\n", fsp_str_dbg(fsp),
2655                           fsp->fh->fd, (unsigned long long)fsp->vuid,
2656                           (unsigned int)fsp->file_pid,
2657                           (unsigned int)fsp->fh->private_options,
2658                           (unsigned int)fsp->access_mask ));
2659
2660                 if (fsp != fsp_to_dup_into &&
2661                     fsp->fh->fd != -1 &&
2662                     fsp->vuid == vuid &&
2663                     fsp->file_pid == file_pid &&
2664                     (fsp->fh->private_options & (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
2665                                                  NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
2666                     (fsp->access_mask & FILE_WRITE_DATA) &&
2667                     strequal(fsp->fsp_name->base_name, smb_fname->base_name) &&
2668                     strequal(fsp->fsp_name->stream_name,
2669                              smb_fname->stream_name)) {
2670                         DEBUG(10,("fcb_or_dos_open: file match\n"));
2671                         break;
2672                 }
2673         }
2674
2675         if (!fsp) {
2676                 return NT_STATUS_NOT_FOUND;
2677         }
2678
2679         /* quite an insane set of semantics ... */
2680         if (is_executable(smb_fname->base_name) &&
2681             (fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
2682                 DEBUG(10,("fcb_or_dos_open: file fail due to is_executable.\n"));
2683                 return NT_STATUS_INVALID_PARAMETER;
2684         }
2685
2686         /* We need to duplicate this fsp. */
2687         return dup_file_fsp(req, fsp, access_mask, share_access,
2688                             create_options, fsp_to_dup_into);
2689 }
2690
2691 static void schedule_defer_open(struct share_mode_lock *lck,
2692                                 struct file_id id,
2693                                 struct timeval request_time,
2694                                 struct smb_request *req)
2695 {
2696         /* This is a relative time, added to the absolute
2697            request_time value to get the absolute timeout time.
2698            Note that if this is the second or greater time we enter
2699            this codepath for this particular request mid then
2700            request_time is left as the absolute time of the *first*
2701            time this request mid was processed. This is what allows
2702            the request to eventually time out. */
2703
2704         struct timeval timeout;
2705
2706         /* Normally the smbd we asked should respond within
2707          * OPLOCK_BREAK_TIMEOUT seconds regardless of whether
2708          * the client did, give twice the timeout as a safety
2709          * measure here in case the other smbd is stuck
2710          * somewhere else. */
2711
2712         timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2713
2714         if (request_timed_out(request_time, timeout)) {
2715                 return;
2716         }
2717
2718         defer_open(lck, request_time, timeout, req, true, id);
2719 }
2720
2721 /****************************************************************************
2722  Reschedule an open call that went asynchronous.
2723 ****************************************************************************/
2724
2725 static void schedule_async_open_timer(struct tevent_context *ev,
2726                                       struct tevent_timer *te,
2727                                       struct timeval current_time,
2728                                       void *private_data)
2729 {
2730         exit_server("async open timeout");
2731 }
2732
2733 static void schedule_async_open(struct timeval request_time,
2734                                 struct smb_request *req)
2735 {
2736         struct deferred_open_record *open_rec = NULL;
2737         struct timeval timeout = timeval_set(20, 0);
2738         bool ok;
2739
2740         if (request_timed_out(request_time, timeout)) {
2741                 return;
2742         }
2743
2744         open_rec = deferred_open_record_create(false, true, (struct file_id){0});
2745         if (open_rec == NULL) {
2746                 exit_server("deferred_open_record_create failed");
2747         }
2748
2749         ok = push_deferred_open_message_smb(req, request_time, timeout,
2750                                             (struct file_id){0}, open_rec);
2751         if (!ok) {
2752                 exit_server("push_deferred_open_message_smb failed");
2753         }
2754
2755         open_rec->te = tevent_add_timer(req->sconn->ev_ctx,
2756                                         req,
2757                                         timeval_current_ofs(20, 0),
2758                                         schedule_async_open_timer,
2759                                         open_rec);
2760         if (open_rec->te == NULL) {
2761                 exit_server("tevent_add_timer failed");
2762         }
2763 }
2764
2765 /****************************************************************************
2766  Work out what access_mask to use from what the client sent us.
2767 ****************************************************************************/
2768
2769 static NTSTATUS smbd_calculate_maximum_allowed_access(
2770         connection_struct *conn,
2771         const struct smb_filename *smb_fname,
2772         bool use_privs,
2773         uint32_t *p_access_mask)
2774 {
2775         struct security_descriptor *sd;
2776         uint32_t access_granted;
2777         NTSTATUS status;
2778
2779         if (!use_privs && (get_current_uid(conn) == (uid_t)0)) {
2780                 *p_access_mask |= FILE_GENERIC_ALL;
2781                 return NT_STATUS_OK;
2782         }
2783
2784         status = SMB_VFS_GET_NT_ACL(conn, smb_fname,
2785                                     (SECINFO_OWNER |
2786                                      SECINFO_GROUP |
2787                                      SECINFO_DACL),
2788                                     talloc_tos(), &sd);
2789
2790         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
2791                 /*
2792                  * File did not exist
2793                  */
2794                 *p_access_mask = FILE_GENERIC_ALL;
2795                 return NT_STATUS_OK;
2796         }
2797         if (!NT_STATUS_IS_OK(status)) {
2798                 DEBUG(10,("Could not get acl on file %s: %s\n",
2799                           smb_fname_str_dbg(smb_fname),
2800                           nt_errstr(status)));
2801                 return NT_STATUS_ACCESS_DENIED;
2802         }
2803
2804         /*
2805          * If we can access the path to this file, by
2806          * default we have FILE_READ_ATTRIBUTES from the
2807          * containing directory. See the section:
2808          * "Algorithm to Check Access to an Existing File"
2809          * in MS-FSA.pdf.
2810          *
2811          * se_file_access_check()
2812          * also takes care of owner WRITE_DAC and READ_CONTROL.
2813          */
2814         status = se_file_access_check(sd,
2815                                  get_current_nttok(conn),
2816                                  use_privs,
2817                                  (*p_access_mask & ~FILE_READ_ATTRIBUTES),
2818                                  &access_granted);
2819
2820         TALLOC_FREE(sd);
2821
2822         if (!NT_STATUS_IS_OK(status)) {
2823                 DEBUG(10, ("Access denied on file %s: "
2824                            "when calculating maximum access\n",
2825                            smb_fname_str_dbg(smb_fname)));
2826                 return NT_STATUS_ACCESS_DENIED;
2827         }
2828         *p_access_mask = (access_granted | FILE_READ_ATTRIBUTES);
2829
2830         if (!(access_granted & DELETE_ACCESS)) {
2831                 if (can_delete_file_in_directory(conn, smb_fname)) {
2832                         *p_access_mask |= DELETE_ACCESS;
2833                 }
2834         }
2835
2836         return NT_STATUS_OK;
2837 }
2838
2839 NTSTATUS smbd_calculate_access_mask(connection_struct *conn,
2840                                     const struct smb_filename *smb_fname,
2841                                     bool use_privs,
2842                                     uint32_t access_mask,
2843                                     uint32_t *access_mask_out)
2844 {
2845         NTSTATUS status;
2846         uint32_t orig_access_mask = access_mask;
2847         uint32_t rejected_share_access;
2848
2849         if (access_mask & SEC_MASK_INVALID) {
2850                 DBG_DEBUG("access_mask [%8x] contains invalid bits\n",
2851                           access_mask);
2852                 return NT_STATUS_ACCESS_DENIED;
2853         }
2854
2855         /*
2856          * Convert GENERIC bits to specific bits.
2857          */
2858
2859         se_map_generic(&access_mask, &file_generic_mapping);
2860
2861         /* Calculate MAXIMUM_ALLOWED_ACCESS if requested. */
2862         if (access_mask & MAXIMUM_ALLOWED_ACCESS) {
2863
2864                 status = smbd_calculate_maximum_allowed_access(
2865                         conn, smb_fname, use_privs, &access_mask);
2866
2867                 if (!NT_STATUS_IS_OK(status)) {
2868                         return status;
2869                 }
2870
2871                 access_mask &= conn->share_access;
2872         }
2873
2874         rejected_share_access = access_mask & ~(conn->share_access);
2875
2876         if (rejected_share_access) {
2877                 DEBUG(10, ("smbd_calculate_access_mask: Access denied on "
2878                         "file %s: rejected by share access mask[0x%08X] "
2879                         "orig[0x%08X] mapped[0x%08X] reject[0x%08X]\n",
2880                         smb_fname_str_dbg(smb_fname),
2881                         conn->share_access,
2882                         orig_access_mask, access_mask,
2883                         rejected_share_access));
2884                 return NT_STATUS_ACCESS_DENIED;
2885         }
2886
2887         *access_mask_out = access_mask;
2888         return NT_STATUS_OK;
2889 }
2890
2891 /****************************************************************************
2892  Remove the deferred open entry under lock.
2893 ****************************************************************************/
2894
2895 /****************************************************************************
2896  Return true if this is a state pointer to an asynchronous create.
2897 ****************************************************************************/
2898
2899 bool is_deferred_open_async(const struct deferred_open_record *rec)
2900 {
2901         return rec->async_open;
2902 }
2903
2904 static bool clear_ads(uint32_t create_disposition)
2905 {
2906         bool ret = false;
2907
2908         switch (create_disposition) {
2909         case FILE_SUPERSEDE:
2910         case FILE_OVERWRITE_IF:
2911         case FILE_OVERWRITE:
2912                 ret = true;
2913                 break;
2914         default:
2915                 break;
2916         }
2917         return ret;
2918 }
2919
2920 static int disposition_to_open_flags(uint32_t create_disposition)
2921 {
2922         int ret = 0;
2923
2924         /*
2925          * Currently we're using FILE_SUPERSEDE as the same as
2926          * FILE_OVERWRITE_IF but they really are
2927          * different. FILE_SUPERSEDE deletes an existing file
2928          * (requiring delete access) then recreates it.
2929          */
2930
2931         switch (create_disposition) {
2932         case FILE_SUPERSEDE:
2933         case FILE_OVERWRITE_IF:
2934                 /*
2935                  * If file exists replace/overwrite. If file doesn't
2936                  * exist create.
2937                  */
2938                 ret = O_CREAT|O_TRUNC;
2939                 break;
2940
2941         case FILE_OPEN:
2942                 /*
2943                  * If file exists open. If file doesn't exist error.
2944                  */
2945                 ret = 0;
2946                 break;
2947
2948         case FILE_OVERWRITE:
2949                 /*
2950                  * If file exists overwrite. If file doesn't exist
2951                  * error.
2952                  */
2953                 ret = O_TRUNC;
2954                 break;
2955
2956         case FILE_CREATE:
2957                 /*
2958                  * If file exists error. If file doesn't exist create.
2959                  */
2960                 ret = O_CREAT|O_EXCL;
2961                 break;
2962
2963         case FILE_OPEN_IF:
2964                 /*
2965                  * If file exists open. If file doesn't exist create.
2966                  */
2967                 ret = O_CREAT;
2968                 break;
2969         }
2970         return ret;
2971 }
2972
2973 static int calculate_open_access_flags(uint32_t access_mask,
2974                                        uint32_t private_flags)
2975 {
2976         bool need_write, need_read;
2977
2978         /*
2979          * Note that we ignore the append flag as append does not
2980          * mean the same thing under DOS and Unix.
2981          */
2982
2983         need_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA));
2984         if (!need_write) {
2985                 return O_RDONLY;
2986         }
2987
2988         /* DENY_DOS opens are always underlying read-write on the
2989            file handle, no matter what the requested access mask
2990            says. */
2991
2992         need_read =
2993                 ((private_flags & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS) ||
2994                  access_mask & (FILE_READ_ATTRIBUTES|FILE_READ_DATA|
2995                                 FILE_READ_EA|FILE_EXECUTE));
2996
2997         if (!need_read) {
2998                 return O_WRONLY;
2999         }
3000         return O_RDWR;
3001 }
3002
3003 /****************************************************************************
3004  Open a file with a share mode. Passed in an already created files_struct *.
3005 ****************************************************************************/
3006
3007 static NTSTATUS open_file_ntcreate(connection_struct *conn,
3008                             struct smb_request *req,
3009                             uint32_t access_mask,               /* access bits (FILE_READ_DATA etc.) */
3010                             uint32_t share_access,      /* share constants (FILE_SHARE_READ etc) */
3011                             uint32_t create_disposition,        /* FILE_OPEN_IF etc. */
3012                             uint32_t create_options,    /* options such as delete on close. */
3013                             uint32_t new_dos_attributes,        /* attributes used for new file. */
3014                             int oplock_request,         /* internal Samba oplock codes. */
3015                             struct smb2_lease *lease,
3016                                                         /* Information (FILE_EXISTS etc.) */
3017                             uint32_t private_flags,     /* Samba specific flags. */
3018                             int *pinfo,
3019                             files_struct *fsp)
3020 {
3021         struct smb_filename *smb_fname = fsp->fsp_name;
3022         int flags=0;
3023         int flags2=0;
3024         bool file_existed = VALID_STAT(smb_fname->st);
3025         bool def_acl = False;
3026         bool posix_open = False;
3027         bool new_file_created = False;
3028         bool first_open_attempt =&