Add bool use_privs parameter to smbd_check_access_rights()
[kai/samba.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
8    This program is free software; you can redistribute it and/or modify
9    it under the terms of the GNU General Public License as published by
10    the Free Software Foundation; either version 3 of the License, or
11    (at your option) any later version.
12
13    This program is distributed in the hope that it will be useful,
14    but WITHOUT ANY WARRANTY; without even the implied warranty of
15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16    GNU General Public License for more details.
17
18    You should have received a copy of the GNU General Public License
19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "system/filesys.h"
24 #include "printing.h"
25 #include "smbd/smbd.h"
26 #include "smbd/globals.h"
27 #include "fake_file.h"
28 #include "../libcli/security/security.h"
29 #include "../librpc/gen_ndr/ndr_security.h"
30 #include "../librpc/gen_ndr/open_files.h"
31 #include "auth.h"
32 #include "serverid.h"
33 #include "messages.h"
34
35 extern const struct generic_mapping file_generic_mapping;
36
37 struct deferred_open_record {
38         bool delayed_for_oplocks;
39         bool async_open;
40         struct file_id id;
41 };
42
43 /****************************************************************************
44  If the requester wanted DELETE_ACCESS and was rejected because
45  the file ACL didn't include DELETE_ACCESS, see if the parent ACL
46  overrides this.
47 ****************************************************************************/
48
49 static bool parent_override_delete(connection_struct *conn,
50                                         const struct smb_filename *smb_fname,
51                                         uint32_t access_mask,
52                                         uint32_t rejected_mask)
53 {
54         if ((access_mask & DELETE_ACCESS) &&
55                     (rejected_mask & DELETE_ACCESS) &&
56                     can_delete_file_in_directory(conn, smb_fname)) {
57                 return true;
58         }
59         return false;
60 }
61
62 /****************************************************************************
63  Check if we have open rights.
64 ****************************************************************************/
65
66 NTSTATUS smbd_check_access_rights(struct connection_struct *conn,
67                                 const struct smb_filename *smb_fname,
68                                 bool use_privs,
69                                 uint32_t access_mask)
70 {
71         /* Check if we have rights to open. */
72         NTSTATUS status;
73         struct security_descriptor *sd = NULL;
74         uint32_t rejected_share_access;
75         uint32_t rejected_mask = access_mask;
76
77         rejected_share_access = access_mask & ~(conn->share_access);
78
79         if (rejected_share_access) {
80                 DEBUG(10, ("smbd_check_access_rights: rejected share access 0x%x "
81                         "on %s (0x%x)\n",
82                         (unsigned int)access_mask,
83                         smb_fname_str_dbg(smb_fname),
84                         (unsigned int)rejected_share_access ));
85                 return NT_STATUS_ACCESS_DENIED;
86         }
87
88         if (!use_privs && get_current_uid(conn) == (uid_t)0) {
89                 /* I'm sorry sir, I didn't know you were root... */
90                 DEBUG(10,("smbd_check_access_rights: root override "
91                         "on %s. Granting 0x%x\n",
92                         smb_fname_str_dbg(smb_fname),
93                         (unsigned int)access_mask ));
94                 return NT_STATUS_OK;
95         }
96
97         if ((access_mask & DELETE_ACCESS) && !lp_acl_check_permissions(SNUM(conn))) {
98                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
99                         "on DELETE_ACCESS on file %s. Granting 0x%x\n",
100                         smb_fname_str_dbg(smb_fname),
101                         (unsigned int)access_mask ));
102                 return NT_STATUS_OK;
103         }
104
105         if (access_mask == DELETE_ACCESS &&
106                         VALID_STAT(smb_fname->st) &&
107                         S_ISLNK(smb_fname->st.st_ex_mode)) {
108                 /* We can always delete a symlink. */
109                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
110                         "on DELETE_ACCESS on symlink %s.\n",
111                         smb_fname_str_dbg(smb_fname) ));
112                 return NT_STATUS_OK;
113         }
114
115         status = SMB_VFS_GET_NT_ACL(conn, smb_fname->base_name,
116                         (SECINFO_OWNER |
117                         SECINFO_GROUP |
118                         SECINFO_DACL),&sd);
119
120         if (!NT_STATUS_IS_OK(status)) {
121                 DEBUG(10, ("smbd_check_access_rights: Could not get acl "
122                         "on %s: %s\n",
123                         smb_fname_str_dbg(smb_fname),
124                         nt_errstr(status)));
125
126                 if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
127                         goto access_denied;
128                 }
129
130                 return status;
131         }
132
133         /*
134          * Never test FILE_READ_ATTRIBUTES. se_file_access_check() also takes care of
135          * owner WRITE_DAC and READ_CONTROL.
136          */
137         status = se_file_access_check(sd,
138                                 get_current_nttok(conn),
139                                 use_privs,
140                                 (access_mask & ~FILE_READ_ATTRIBUTES),
141                                 &rejected_mask);
142
143         DEBUG(10,("smbd_check_access_rights: file %s requesting "
144                 "0x%x returning 0x%x (%s)\n",
145                 smb_fname_str_dbg(smb_fname),
146                 (unsigned int)access_mask,
147                 (unsigned int)rejected_mask,
148                 nt_errstr(status) ));
149
150         if (!NT_STATUS_IS_OK(status)) {
151                 if (DEBUGLEVEL >= 10) {
152                         DEBUG(10,("smbd_check_access_rights: acl for %s is:\n",
153                                 smb_fname_str_dbg(smb_fname) ));
154                         NDR_PRINT_DEBUG(security_descriptor, sd);
155                 }
156         }
157
158         TALLOC_FREE(sd);
159
160         if (NT_STATUS_IS_OK(status) ||
161                         !NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
162                 return status;
163         }
164
165         /* Here we know status == NT_STATUS_ACCESS_DENIED. */
166
167   access_denied:
168
169         if ((access_mask & FILE_WRITE_ATTRIBUTES) &&
170                         (rejected_mask & FILE_WRITE_ATTRIBUTES) &&
171                         !lp_store_dos_attributes(SNUM(conn)) &&
172                         (lp_map_readonly(SNUM(conn)) ||
173                         lp_map_archive(SNUM(conn)) ||
174                         lp_map_hidden(SNUM(conn)) ||
175                         lp_map_system(SNUM(conn)))) {
176                 rejected_mask &= ~FILE_WRITE_ATTRIBUTES;
177
178                 DEBUG(10,("smbd_check_access_rights: "
179                         "overrode "
180                         "FILE_WRITE_ATTRIBUTES "
181                         "on file %s\n",
182                         smb_fname_str_dbg(smb_fname)));
183         }
184
185         if (parent_override_delete(conn,
186                                 smb_fname,
187                                 access_mask,
188                                 rejected_mask)) {
189                 /* Were we trying to do an open
190                  * for delete and didn't get DELETE
191                  * access (only) ? Check if the
192                  * directory allows DELETE_CHILD.
193                  * See here:
194                  * http://blogs.msdn.com/oldnewthing/archive/2004/06/04/148426.aspx
195                  * for details. */
196
197                 rejected_mask &= ~DELETE_ACCESS;
198
199                 DEBUG(10,("smbd_check_access_rights: "
200                         "overrode "
201                         "DELETE_ACCESS on "
202                         "file %s\n",
203                         smb_fname_str_dbg(smb_fname)));
204         }
205
206         if (rejected_mask != 0) {
207                 return NT_STATUS_ACCESS_DENIED;
208         }
209         return NT_STATUS_OK;
210 }
211
212 static NTSTATUS check_parent_access(struct connection_struct *conn,
213                                 struct smb_filename *smb_fname,
214                                 uint32_t access_mask)
215 {
216         NTSTATUS status;
217         char *parent_dir = NULL;
218         struct security_descriptor *parent_sd = NULL;
219         uint32_t access_granted = 0;
220
221         if (!parent_dirname(talloc_tos(),
222                                 smb_fname->base_name,
223                                 &parent_dir,
224                                 NULL)) {
225                 return NT_STATUS_NO_MEMORY;
226         }
227
228         if (get_current_uid(conn) == (uid_t)0) {
229                 /* I'm sorry sir, I didn't know you were root... */
230                 DEBUG(10,("check_parent_access: root override "
231                         "on %s. Granting 0x%x\n",
232                         smb_fname_str_dbg(smb_fname),
233                         (unsigned int)access_mask ));
234                 return NT_STATUS_OK;
235         }
236
237         status = SMB_VFS_GET_NT_ACL(conn,
238                                 parent_dir,
239                                 SECINFO_DACL,
240                                 &parent_sd);
241
242         if (!NT_STATUS_IS_OK(status)) {
243                 DEBUG(5,("check_parent_access: SMB_VFS_GET_NT_ACL failed for "
244                         "%s with error %s\n",
245                         parent_dir,
246                         nt_errstr(status)));
247                 return status;
248         }
249
250         /*
251          * Never test FILE_READ_ATTRIBUTES. se_file_access_check() also takes care of
252          * owner WRITE_DAC and READ_CONTROL.
253          */
254         status = se_file_access_check(parent_sd,
255                                 get_current_nttok(conn),
256                                 false,
257                                 (access_mask & ~FILE_READ_ATTRIBUTES),
258                                 &access_granted);
259         if(!NT_STATUS_IS_OK(status)) {
260                 DEBUG(5,("check_parent_access: access check "
261                         "on directory %s for "
262                         "path %s for mask 0x%x returned (0x%x) %s\n",
263                         parent_dir,
264                         smb_fname->base_name,
265                         access_mask,
266                         access_granted,
267                         nt_errstr(status) ));
268                 return status;
269         }
270
271         return NT_STATUS_OK;
272 }
273
274 /****************************************************************************
275  fd support routines - attempt to do a dos_open.
276 ****************************************************************************/
277
278 NTSTATUS fd_open(struct connection_struct *conn,
279                  files_struct *fsp,
280                  int flags,
281                  mode_t mode)
282 {
283         struct smb_filename *smb_fname = fsp->fsp_name;
284         NTSTATUS status = NT_STATUS_OK;
285
286 #ifdef O_NOFOLLOW
287         /* 
288          * Never follow symlinks on a POSIX client. The
289          * client should be doing this.
290          */
291
292         if (fsp->posix_open || !lp_symlinks(SNUM(conn))) {
293                 flags |= O_NOFOLLOW;
294         }
295 #endif
296
297         fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, flags, mode);
298         if (fsp->fh->fd == -1) {
299                 int posix_errno = errno;
300 #ifdef O_NOFOLLOW
301 #if defined(ENOTSUP) && defined(OSF1)
302                 /* handle special Tru64 errno */
303                 if (errno == ENOTSUP) {
304                         posix_errno = ELOOP;
305                 }
306 #endif /* ENOTSUP */
307 #ifdef EFTYPE
308                 /* fix broken NetBSD errno */
309                 if (errno == EFTYPE) {
310                         posix_errno = ELOOP;
311                 }
312 #endif /* EFTYPE */
313                 /* fix broken FreeBSD errno */
314                 if (errno == EMLINK) {
315                         posix_errno = ELOOP;
316                 }
317 #endif /* O_NOFOLLOW */
318                 status = map_nt_error_from_unix(posix_errno);
319                 if (errno == EMFILE) {
320                         static time_t last_warned = 0L;
321
322                         if (time((time_t *) NULL) > last_warned) {
323                                 DEBUG(0,("Too many open files, unable "
324                                         "to open more!  smbd's max "
325                                         "open files = %d\n",
326                                         lp_max_open_files()));
327                                 last_warned = time((time_t *) NULL);
328                         }
329                 }
330
331         }
332
333         DEBUG(10,("fd_open: name %s, flags = 0%o mode = 0%o, fd = %d. %s\n",
334                   smb_fname_str_dbg(smb_fname), flags, (int)mode, fsp->fh->fd,
335                 (fsp->fh->fd == -1) ? strerror(errno) : "" ));
336
337         return status;
338 }
339
340 /****************************************************************************
341  Close the file associated with a fsp.
342 ****************************************************************************/
343
344 NTSTATUS fd_close(files_struct *fsp)
345 {
346         int ret;
347
348         if (fsp->dptr) {
349                 dptr_CloseDir(fsp);
350         }
351         if (fsp->fh->fd == -1) {
352                 return NT_STATUS_OK; /* What we used to call a stat open. */
353         }
354         if (fsp->fh->ref_count > 1) {
355                 return NT_STATUS_OK; /* Shared handle. Only close last reference. */
356         }
357
358         ret = SMB_VFS_CLOSE(fsp);
359         fsp->fh->fd = -1;
360         if (ret == -1) {
361                 return map_nt_error_from_unix(errno);
362         }
363         return NT_STATUS_OK;
364 }
365
366 /****************************************************************************
367  Change the ownership of a file to that of the parent directory.
368  Do this by fd if possible.
369 ****************************************************************************/
370
371 void change_file_owner_to_parent(connection_struct *conn,
372                                         const char *inherit_from_dir,
373                                         files_struct *fsp)
374 {
375         struct smb_filename *smb_fname_parent = NULL;
376         NTSTATUS status;
377         int ret;
378
379         status = create_synthetic_smb_fname(talloc_tos(), inherit_from_dir,
380                                             NULL, NULL, &smb_fname_parent);
381         if (!NT_STATUS_IS_OK(status)) {
382                 return;
383         }
384
385         ret = SMB_VFS_STAT(conn, smb_fname_parent);
386         if (ret == -1) {
387                 DEBUG(0,("change_file_owner_to_parent: failed to stat parent "
388                          "directory %s. Error was %s\n",
389                          smb_fname_str_dbg(smb_fname_parent),
390                          strerror(errno)));
391                 TALLOC_FREE(smb_fname_parent);
392                 return;
393         }
394
395         if (smb_fname_parent->st.st_ex_uid == fsp->fsp_name->st.st_ex_uid) {
396                 /* Already this uid - no need to change. */
397                 DEBUG(10,("change_file_owner_to_parent: file %s "
398                         "is already owned by uid %d\n",
399                         fsp_str_dbg(fsp),
400                         (int)fsp->fsp_name->st.st_ex_uid ));
401                 TALLOC_FREE(smb_fname_parent);
402                 return;
403         }
404
405         become_root();
406         ret = SMB_VFS_FCHOWN(fsp, smb_fname_parent->st.st_ex_uid, (gid_t)-1);
407         unbecome_root();
408         if (ret == -1) {
409                 DEBUG(0,("change_file_owner_to_parent: failed to fchown "
410                          "file %s to parent directory uid %u. Error "
411                          "was %s\n", fsp_str_dbg(fsp),
412                          (unsigned int)smb_fname_parent->st.st_ex_uid,
413                          strerror(errno) ));
414         } else {
415                 DEBUG(10,("change_file_owner_to_parent: changed new file %s to "
416                         "parent directory uid %u.\n", fsp_str_dbg(fsp),
417                         (unsigned int)smb_fname_parent->st.st_ex_uid));
418                 /* Ensure the uid entry is updated. */
419                 fsp->fsp_name->st.st_ex_uid = smb_fname_parent->st.st_ex_uid;
420         }
421
422         TALLOC_FREE(smb_fname_parent);
423 }
424
425 NTSTATUS change_dir_owner_to_parent(connection_struct *conn,
426                                        const char *inherit_from_dir,
427                                        const char *fname,
428                                        SMB_STRUCT_STAT *psbuf)
429 {
430         struct smb_filename *smb_fname_parent = NULL;
431         struct smb_filename *smb_fname_cwd = NULL;
432         char *saved_dir = NULL;
433         TALLOC_CTX *ctx = talloc_tos();
434         NTSTATUS status = NT_STATUS_OK;
435         int ret;
436
437         status = create_synthetic_smb_fname(ctx, inherit_from_dir, NULL, NULL,
438                                             &smb_fname_parent);
439         if (!NT_STATUS_IS_OK(status)) {
440                 return status;
441         }
442
443         ret = SMB_VFS_STAT(conn, smb_fname_parent);
444         if (ret == -1) {
445                 status = map_nt_error_from_unix(errno);
446                 DEBUG(0,("change_dir_owner_to_parent: failed to stat parent "
447                          "directory %s. Error was %s\n",
448                          smb_fname_str_dbg(smb_fname_parent),
449                          strerror(errno)));
450                 goto out;
451         }
452
453         /* We've already done an lstat into psbuf, and we know it's a
454            directory. If we can cd into the directory and the dev/ino
455            are the same then we can safely chown without races as
456            we're locking the directory in place by being in it.  This
457            should work on any UNIX (thanks tridge :-). JRA.
458         */
459
460         saved_dir = vfs_GetWd(ctx,conn);
461         if (!saved_dir) {
462                 status = map_nt_error_from_unix(errno);
463                 DEBUG(0,("change_dir_owner_to_parent: failed to get "
464                          "current working directory. Error was %s\n",
465                          strerror(errno)));
466                 goto out;
467         }
468
469         /* Chdir into the new path. */
470         if (vfs_ChDir(conn, fname) == -1) {
471                 status = map_nt_error_from_unix(errno);
472                 DEBUG(0,("change_dir_owner_to_parent: failed to change "
473                          "current working directory to %s. Error "
474                          "was %s\n", fname, strerror(errno) ));
475                 goto chdir;
476         }
477
478         status = create_synthetic_smb_fname(ctx, ".", NULL, NULL,
479                                             &smb_fname_cwd);
480         if (!NT_STATUS_IS_OK(status)) {
481                 return status;
482         }
483
484         ret = SMB_VFS_STAT(conn, smb_fname_cwd);
485         if (ret == -1) {
486                 status = map_nt_error_from_unix(errno);
487                 DEBUG(0,("change_dir_owner_to_parent: failed to stat "
488                          "directory '.' (%s) Error was %s\n",
489                          fname, strerror(errno)));
490                 goto chdir;
491         }
492
493         /* Ensure we're pointing at the same place. */
494         if (smb_fname_cwd->st.st_ex_dev != psbuf->st_ex_dev ||
495             smb_fname_cwd->st.st_ex_ino != psbuf->st_ex_ino) {
496                 DEBUG(0,("change_dir_owner_to_parent: "
497                          "device/inode on directory %s changed. "
498                          "Refusing to chown !\n", fname ));
499                 status = NT_STATUS_ACCESS_DENIED;
500                 goto chdir;
501         }
502
503         if (smb_fname_parent->st.st_ex_uid == smb_fname_cwd->st.st_ex_uid) {
504                 /* Already this uid - no need to change. */
505                 DEBUG(10,("change_dir_owner_to_parent: directory %s "
506                         "is already owned by uid %d\n",
507                         fname,
508                         (int)smb_fname_cwd->st.st_ex_uid ));
509                 status = NT_STATUS_OK;
510                 goto chdir;
511         }
512
513         become_root();
514         ret = SMB_VFS_LCHOWN(conn, ".", smb_fname_parent->st.st_ex_uid,
515                             (gid_t)-1);
516         unbecome_root();
517         if (ret == -1) {
518                 status = map_nt_error_from_unix(errno);
519                 DEBUG(10,("change_dir_owner_to_parent: failed to chown "
520                           "directory %s to parent directory uid %u. "
521                           "Error was %s\n", fname,
522                           (unsigned int)smb_fname_parent->st.st_ex_uid,
523                           strerror(errno) ));
524         } else {
525                 DEBUG(10,("change_dir_owner_to_parent: changed ownership of new "
526                         "directory %s to parent directory uid %u.\n",
527                         fname, (unsigned int)smb_fname_parent->st.st_ex_uid ));
528                 /* Ensure the uid entry is updated. */
529                 psbuf->st_ex_uid = smb_fname_parent->st.st_ex_uid;
530         }
531
532  chdir:
533         vfs_ChDir(conn,saved_dir);
534  out:
535         TALLOC_FREE(smb_fname_parent);
536         TALLOC_FREE(smb_fname_cwd);
537         return status;
538 }
539
540 /****************************************************************************
541  Open a file - returning a guaranteed ATOMIC indication of if the
542  file was created or not.
543 ****************************************************************************/
544
545 static NTSTATUS fd_open_atomic(struct connection_struct *conn,
546                         files_struct *fsp,
547                         int flags,
548                         mode_t mode,
549                         bool *file_created)
550 {
551         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
552         bool file_existed = VALID_STAT(fsp->fsp_name->st);
553
554         *file_created = false;
555
556         if (!(flags & O_CREAT)) {
557                 /*
558                  * We're not creating the file, just pass through.
559                  */
560                 return fd_open(conn, fsp, flags, mode);
561         }
562
563         if (flags & O_EXCL) {
564                 /*
565                  * Fail if already exists, just pass through.
566                  */
567                 status = fd_open(conn, fsp, flags, mode);
568
569                 /*
570                  * Here we've opened with O_CREAT|O_EXCL. If that went
571                  * NT_STATUS_OK, we *know* we created this file.
572                  */
573                 *file_created = NT_STATUS_IS_OK(status);
574
575                 return status;
576         }
577
578         /*
579          * Now it gets tricky. We have O_CREAT, but not O_EXCL.
580          * To know absolutely if we created the file or not,
581          * we can never call O_CREAT without O_EXCL. So if
582          * we think the file existed, try without O_CREAT|O_EXCL.
583          * If we think the file didn't exist, try with
584          * O_CREAT|O_EXCL. Keep bouncing between these two
585          * requests until either the file is created, or
586          * opened. Either way, we keep going until we get
587          * a returnable result (error, or open/create).
588          */
589
590         while(1) {
591                 int curr_flags = flags;
592
593                 if (file_existed) {
594                         /* Just try open, do not create. */
595                         curr_flags &= ~(O_CREAT);
596                         status = fd_open(conn, fsp, curr_flags, mode);
597                         if (NT_STATUS_EQUAL(status,
598                                         NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
599                                 /*
600                                  * Someone deleted it in the meantime.
601                                  * Retry with O_EXCL.
602                                  */
603                                 file_existed = false;
604                                 DEBUG(10,("fd_open_atomic: file %s existed. "
605                                         "Retry.\n",
606                                         smb_fname_str_dbg(fsp->fsp_name)));
607                                         continue;
608                         }
609                 } else {
610                         /* Try create exclusively, fail if it exists. */
611                         curr_flags |= O_EXCL;
612                         status = fd_open(conn, fsp, curr_flags, mode);
613                         if (NT_STATUS_EQUAL(status,
614                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
615                                 /*
616                                  * Someone created it in the meantime.
617                                  * Retry without O_CREAT.
618                                  */
619                                 file_existed = true;
620                                 DEBUG(10,("fd_open_atomic: file %s "
621                                         "did not exist. Retry.\n",
622                                         smb_fname_str_dbg(fsp->fsp_name)));
623                                 continue;
624                         }
625                         if (NT_STATUS_IS_OK(status)) {
626                                 /*
627                                  * Here we've opened with O_CREAT|O_EXCL
628                                  * and got success. We *know* we created
629                                  * this file.
630                                  */
631                                 *file_created = true;
632                         }
633                 }
634                 /* Create is done, or failed. */
635                 break;
636         }
637         return status;
638 }
639
640 /****************************************************************************
641  Open a file.
642 ****************************************************************************/
643
644 static NTSTATUS open_file(files_struct *fsp,
645                           connection_struct *conn,
646                           struct smb_request *req,
647                           const char *parent_dir,
648                           int flags,
649                           mode_t unx_mode,
650                           uint32 access_mask, /* client requested access mask. */
651                           uint32 open_access_mask, /* what we're actually using in the open. */
652                           bool *p_file_created)
653 {
654         struct smb_filename *smb_fname = fsp->fsp_name;
655         NTSTATUS status = NT_STATUS_OK;
656         int accmode = (flags & O_ACCMODE);
657         int local_flags = flags;
658         bool file_existed = VALID_STAT(fsp->fsp_name->st);
659
660         fsp->fh->fd = -1;
661         errno = EPERM;
662
663         /* Check permissions */
664
665         /*
666          * This code was changed after seeing a client open request 
667          * containing the open mode of (DENY_WRITE/read-only) with
668          * the 'create if not exist' bit set. The previous code
669          * would fail to open the file read only on a read-only share
670          * as it was checking the flags parameter  directly against O_RDONLY,
671          * this was failing as the flags parameter was set to O_RDONLY|O_CREAT.
672          * JRA.
673          */
674
675         if (!CAN_WRITE(conn)) {
676                 /* It's a read-only share - fail if we wanted to write. */
677                 if(accmode != O_RDONLY || (flags & O_TRUNC) || (flags & O_APPEND)) {
678                         DEBUG(3,("Permission denied opening %s\n",
679                                  smb_fname_str_dbg(smb_fname)));
680                         return NT_STATUS_ACCESS_DENIED;
681                 } else if(flags & O_CREAT) {
682                         /* We don't want to write - but we must make sure that
683                            O_CREAT doesn't create the file if we have write
684                            access into the directory.
685                         */
686                         flags &= ~(O_CREAT|O_EXCL);
687                         local_flags &= ~(O_CREAT|O_EXCL);
688                 }
689         }
690
691         /*
692          * This little piece of insanity is inspired by the
693          * fact that an NT client can open a file for O_RDONLY,
694          * but set the create disposition to FILE_EXISTS_TRUNCATE.
695          * If the client *can* write to the file, then it expects to
696          * truncate the file, even though it is opening for readonly.
697          * Quicken uses this stupid trick in backup file creation...
698          * Thanks *greatly* to "David W. Chapman Jr." <dwcjr@inethouston.net>
699          * for helping track this one down. It didn't bite us in 2.0.x
700          * as we always opened files read-write in that release. JRA.
701          */
702
703         if ((accmode == O_RDONLY) && ((flags & O_TRUNC) == O_TRUNC)) {
704                 DEBUG(10,("open_file: truncate requested on read-only open "
705                           "for file %s\n", smb_fname_str_dbg(smb_fname)));
706                 local_flags = (flags & ~O_ACCMODE)|O_RDWR;
707         }
708
709         if ((open_access_mask & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) ||
710             (!file_existed && (local_flags & O_CREAT)) ||
711             ((local_flags & O_TRUNC) == O_TRUNC) ) {
712                 const char *wild;
713                 int ret;
714
715 #if defined(O_NONBLOCK) && defined(S_ISFIFO)
716                 /*
717                  * We would block on opening a FIFO with no one else on the
718                  * other end. Do what we used to do and add O_NONBLOCK to the
719                  * open flags. JRA.
720                  */
721
722                 if (file_existed && S_ISFIFO(smb_fname->st.st_ex_mode)) {
723                         local_flags &= ~O_TRUNC; /* Can't truncate a FIFO. */
724                         local_flags |= O_NONBLOCK;
725                 }
726 #endif
727
728                 /* Don't create files with Microsoft wildcard characters. */
729                 if (fsp->base_fsp) {
730                         /*
731                          * wildcard characters are allowed in stream names
732                          * only test the basefilename
733                          */
734                         wild = fsp->base_fsp->fsp_name->base_name;
735                 } else {
736                         wild = smb_fname->base_name;
737                 }
738                 if ((local_flags & O_CREAT) && !file_existed &&
739                     ms_has_wild(wild))  {
740                         return NT_STATUS_OBJECT_NAME_INVALID;
741                 }
742
743                 /* Can we access this file ? */
744                 if (!fsp->base_fsp) {
745                         /* Only do this check on non-stream open. */
746                         if (file_existed) {
747                                 status = smbd_check_access_rights(conn,
748                                                 smb_fname,
749                                                 false,
750                                                 access_mask);
751                         } else if (local_flags & O_CREAT){
752                                 status = check_parent_access(conn,
753                                                 smb_fname,
754                                                 SEC_DIR_ADD_FILE);
755                         } else {
756                                 /* File didn't exist and no O_CREAT. */
757                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
758                         }
759                         if (!NT_STATUS_IS_OK(status)) {
760                                 DEBUG(10,("open_file: "
761                                         "%s on file "
762                                         "%s returned %s\n",
763                                         file_existed ?
764                                                 "smbd_check_access_rights" :
765                                                 "check_parent_access",
766                                         smb_fname_str_dbg(smb_fname),
767                                         nt_errstr(status) ));
768                                 return status;
769                         }
770                 }
771
772                 /* Actually do the open */
773                 status = fd_open_atomic(conn, fsp, local_flags,
774                                 unx_mode, p_file_created);
775                 if (!NT_STATUS_IS_OK(status)) {
776                         DEBUG(3,("Error opening file %s (%s) (local_flags=%d) "
777                                  "(flags=%d)\n", smb_fname_str_dbg(smb_fname),
778                                  nt_errstr(status),local_flags,flags));
779                         return status;
780                 }
781
782                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
783                 if (ret == -1) {
784                         /* If we have an fd, this stat should succeed. */
785                         DEBUG(0,("Error doing fstat on open file %s "
786                                 "(%s)\n",
787                                 smb_fname_str_dbg(smb_fname),
788                                 strerror(errno) ));
789                         status = map_nt_error_from_unix(errno);
790                         fd_close(fsp);
791                         return status;
792                 }
793
794                 if (*p_file_created) {
795                         /* We created this file. */
796
797                         bool need_re_stat = false;
798                         /* Do all inheritance work after we've
799                            done a successful fstat call and filled
800                            in the stat struct in fsp->fsp_name. */
801
802                         /* Inherit the ACL if required */
803                         if (lp_inherit_perms(SNUM(conn))) {
804                                 inherit_access_posix_acl(conn, parent_dir,
805                                                          smb_fname->base_name,
806                                                          unx_mode);
807                                 need_re_stat = true;
808                         }
809
810                         /* Change the owner if required. */
811                         if (lp_inherit_owner(SNUM(conn))) {
812                                 change_file_owner_to_parent(conn, parent_dir,
813                                                             fsp);
814                                 need_re_stat = true;
815                         }
816
817                         if (need_re_stat) {
818                                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
819                                 /* If we have an fd, this stat should succeed. */
820                                 if (ret == -1) {
821                                         DEBUG(0,("Error doing fstat on open file %s "
822                                                  "(%s)\n",
823                                                  smb_fname_str_dbg(smb_fname),
824                                                  strerror(errno) ));
825                                 }
826                         }
827
828                         notify_fname(conn, NOTIFY_ACTION_ADDED,
829                                      FILE_NOTIFY_CHANGE_FILE_NAME,
830                                      smb_fname->base_name);
831                 }
832         } else {
833                 fsp->fh->fd = -1; /* What we used to call a stat open. */
834                 if (!file_existed) {
835                         /* File must exist for a stat open. */
836                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
837                 }
838
839                 status = smbd_check_access_rights(conn,
840                                 smb_fname,
841                                 false,
842                                 access_mask);
843
844                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
845                                 fsp->posix_open &&
846                                 S_ISLNK(smb_fname->st.st_ex_mode)) {
847                         /* This is a POSIX stat open for delete
848                          * or rename on a symlink that points
849                          * nowhere. Allow. */
850                         DEBUG(10,("open_file: allowing POSIX "
851                                   "open on bad symlink %s\n",
852                                   smb_fname_str_dbg(smb_fname)));
853                         status = NT_STATUS_OK;
854                 }
855
856                 if (!NT_STATUS_IS_OK(status)) {
857                         DEBUG(10,("open_file: "
858                                 "smbd_check_access_rights on file "
859                                 "%s returned %s\n",
860                                 smb_fname_str_dbg(smb_fname),
861                                 nt_errstr(status) ));
862                         return status;
863                 }
864         }
865
866         /*
867          * POSIX allows read-only opens of directories. We don't
868          * want to do this (we use a different code path for this)
869          * so catch a directory open and return an EISDIR. JRA.
870          */
871
872         if(S_ISDIR(smb_fname->st.st_ex_mode)) {
873                 fd_close(fsp);
874                 errno = EISDIR;
875                 return NT_STATUS_FILE_IS_A_DIRECTORY;
876         }
877
878         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
879         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
880         fsp->file_pid = req ? req->smbpid : 0;
881         fsp->can_lock = True;
882         fsp->can_read = ((access_mask & FILE_READ_DATA) != 0);
883         fsp->can_write =
884                 CAN_WRITE(conn) &&
885                 ((access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) != 0);
886         fsp->print_file = NULL;
887         fsp->modified = False;
888         fsp->sent_oplock_break = NO_BREAK_SENT;
889         fsp->is_directory = False;
890         if (conn->aio_write_behind_list &&
891             is_in_path(smb_fname->base_name, conn->aio_write_behind_list,
892                        conn->case_sensitive)) {
893                 fsp->aio_write_behind = True;
894         }
895
896         fsp->wcp = NULL; /* Write cache pointer. */
897
898         DEBUG(2,("%s opened file %s read=%s write=%s (numopen=%d)\n",
899                  conn->session_info->unix_info->unix_name,
900                  smb_fname_str_dbg(smb_fname),
901                  BOOLSTR(fsp->can_read), BOOLSTR(fsp->can_write),
902                  conn->num_files_open));
903
904         errno = 0;
905         return NT_STATUS_OK;
906 }
907
908 /****************************************************************************
909  Check if we can open a file with a share mode.
910  Returns True if conflict, False if not.
911 ****************************************************************************/
912
913 static bool share_conflict(struct share_mode_entry *entry,
914                            uint32 access_mask,
915                            uint32 share_access)
916 {
917         DEBUG(10,("share_conflict: entry->access_mask = 0x%x, "
918                   "entry->share_access = 0x%x, "
919                   "entry->private_options = 0x%x\n",
920                   (unsigned int)entry->access_mask,
921                   (unsigned int)entry->share_access,
922                   (unsigned int)entry->private_options));
923
924         if (server_id_is_disconnected(&entry->pid)) {
925                 /*
926                  * note: cleanup should have been done by
927                  * delay_for_batch_oplocks()
928                  */
929                 return false;
930         }
931
932         DEBUG(10,("share_conflict: access_mask = 0x%x, share_access = 0x%x\n",
933                   (unsigned int)access_mask, (unsigned int)share_access));
934
935         if ((entry->access_mask & (FILE_WRITE_DATA|
936                                    FILE_APPEND_DATA|
937                                    FILE_READ_DATA|
938                                    FILE_EXECUTE|
939                                    DELETE_ACCESS)) == 0) {
940                 DEBUG(10,("share_conflict: No conflict due to "
941                           "entry->access_mask = 0x%x\n",
942                           (unsigned int)entry->access_mask ));
943                 return False;
944         }
945
946         if ((access_mask & (FILE_WRITE_DATA|
947                             FILE_APPEND_DATA|
948                             FILE_READ_DATA|
949                             FILE_EXECUTE|
950                             DELETE_ACCESS)) == 0) {
951                 DEBUG(10,("share_conflict: No conflict due to "
952                           "access_mask = 0x%x\n",
953                           (unsigned int)access_mask ));
954                 return False;
955         }
956
957 #if 1 /* JRA TEST - Superdebug. */
958 #define CHECK_MASK(num, am, right, sa, share) \
959         DEBUG(10,("share_conflict: [%d] am (0x%x) & right (0x%x) = 0x%x\n", \
960                 (unsigned int)(num), (unsigned int)(am), \
961                 (unsigned int)(right), (unsigned int)(am)&(right) )); \
962         DEBUG(10,("share_conflict: [%d] sa (0x%x) & share (0x%x) = 0x%x\n", \
963                 (unsigned int)(num), (unsigned int)(sa), \
964                 (unsigned int)(share), (unsigned int)(sa)&(share) )); \
965         if (((am) & (right)) && !((sa) & (share))) { \
966                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
967 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
968                         (unsigned int)(share) )); \
969                 return True; \
970         }
971 #else
972 #define CHECK_MASK(num, am, right, sa, share) \
973         if (((am) & (right)) && !((sa) & (share))) { \
974                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
975 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
976                         (unsigned int)(share) )); \
977                 return True; \
978         }
979 #endif
980
981         CHECK_MASK(1, entry->access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
982                    share_access, FILE_SHARE_WRITE);
983         CHECK_MASK(2, access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
984                    entry->share_access, FILE_SHARE_WRITE);
985
986         CHECK_MASK(3, entry->access_mask, FILE_READ_DATA | FILE_EXECUTE,
987                    share_access, FILE_SHARE_READ);
988         CHECK_MASK(4, access_mask, FILE_READ_DATA | FILE_EXECUTE,
989                    entry->share_access, FILE_SHARE_READ);
990
991         CHECK_MASK(5, entry->access_mask, DELETE_ACCESS,
992                    share_access, FILE_SHARE_DELETE);
993         CHECK_MASK(6, access_mask, DELETE_ACCESS,
994                    entry->share_access, FILE_SHARE_DELETE);
995
996         DEBUG(10,("share_conflict: No conflict.\n"));
997         return False;
998 }
999
1000 #if defined(DEVELOPER)
1001 static void validate_my_share_entries(struct smbd_server_connection *sconn,
1002                                       int num,
1003                                       struct share_mode_entry *share_entry)
1004 {
1005         struct server_id self = messaging_server_id(sconn->msg_ctx);
1006         files_struct *fsp;
1007
1008         if (!serverid_equal(&self, &share_entry->pid)) {
1009                 return;
1010         }
1011
1012         if (is_deferred_open_entry(share_entry) &&
1013             !open_was_deferred(sconn, share_entry->op_mid)) {
1014                 char *str = talloc_asprintf(talloc_tos(),
1015                         "Got a deferred entry without a request: "
1016                         "PANIC: %s\n",
1017                         share_mode_str(talloc_tos(), num, share_entry));
1018                 smb_panic(str);
1019         }
1020
1021         if (!is_valid_share_mode_entry(share_entry)) {
1022                 return;
1023         }
1024
1025         fsp = file_find_dif(sconn, share_entry->id,
1026                             share_entry->share_file_id);
1027         if (!fsp) {
1028                 DEBUG(0,("validate_my_share_entries: PANIC : %s\n",
1029                          share_mode_str(talloc_tos(), num, share_entry) ));
1030                 smb_panic("validate_my_share_entries: Cannot match a "
1031                           "share entry with an open file\n");
1032         }
1033
1034         if (is_deferred_open_entry(share_entry)) {
1035                 goto panic;
1036         }
1037
1038         if ((share_entry->op_type == NO_OPLOCK) &&
1039             (fsp->oplock_type == FAKE_LEVEL_II_OPLOCK)) {
1040                 /* Someone has already written to it, but I haven't yet
1041                  * noticed */
1042                 return;
1043         }
1044
1045         if (((uint16)fsp->oplock_type) != share_entry->op_type) {
1046                 goto panic;
1047         }
1048
1049         return;
1050
1051  panic:
1052         {
1053                 char *str;
1054                 DEBUG(0,("validate_my_share_entries: PANIC : %s\n",
1055                          share_mode_str(talloc_tos(), num, share_entry) ));
1056                 str = talloc_asprintf(talloc_tos(),
1057                         "validate_my_share_entries: "
1058                         "file %s, oplock_type = 0x%x, op_type = 0x%x\n",
1059                          fsp->fsp_name->base_name,
1060                          (unsigned int)fsp->oplock_type,
1061                          (unsigned int)share_entry->op_type );
1062                 smb_panic(str);
1063         }
1064 }
1065 #endif
1066
1067 bool is_stat_open(uint32 access_mask)
1068 {
1069         return (access_mask &&
1070                 ((access_mask & ~(SYNCHRONIZE_ACCESS| FILE_READ_ATTRIBUTES|
1071                                   FILE_WRITE_ATTRIBUTES))==0) &&
1072                 ((access_mask & (SYNCHRONIZE_ACCESS|FILE_READ_ATTRIBUTES|
1073                                  FILE_WRITE_ATTRIBUTES)) != 0));
1074 }
1075
1076 /****************************************************************************
1077  Deal with share modes
1078  Invarient: Share mode must be locked on entry and exit.
1079  Returns -1 on error, or number of share modes on success (may be zero).
1080 ****************************************************************************/
1081
1082 static NTSTATUS open_mode_check(connection_struct *conn,
1083                                 struct share_mode_lock *lck,
1084                                 uint32_t name_hash,
1085                                 uint32 access_mask,
1086                                 uint32 share_access,
1087                                 uint32 create_options,
1088                                 bool *file_existed)
1089 {
1090         int i;
1091
1092         if(lck->data->num_share_modes == 0) {
1093                 return NT_STATUS_OK;
1094         }
1095
1096         /* A delete on close prohibits everything */
1097
1098         if (is_delete_on_close_set(lck, name_hash)) {
1099                 /*
1100                  * Check the delete on close token
1101                  * is valid. It could have been left
1102                  * after a server crash.
1103                  */
1104                 for(i = 0; i < lck->data->num_share_modes; i++) {
1105                         if (!share_mode_stale_pid(lck->data, i)) {
1106
1107                                 *file_existed = true;
1108
1109                                 return NT_STATUS_DELETE_PENDING;
1110                         }
1111                 }
1112                 return NT_STATUS_OK;
1113         }
1114
1115         if (is_stat_open(access_mask)) {
1116                 /* Stat open that doesn't trigger oplock breaks or share mode
1117                  * checks... ! JRA. */
1118                 return NT_STATUS_OK;
1119         }
1120
1121         /*
1122          * Check if the share modes will give us access.
1123          */
1124
1125 #if defined(DEVELOPER)
1126         for(i = 0; i < lck->data->num_share_modes; i++) {
1127                 validate_my_share_entries(conn->sconn, i,
1128                                           &lck->data->share_modes[i]);
1129         }
1130 #endif
1131
1132         /* Now we check the share modes, after any oplock breaks. */
1133         for(i = 0; i < lck->data->num_share_modes; i++) {
1134
1135                 if (!is_valid_share_mode_entry(&lck->data->share_modes[i])) {
1136                         continue;
1137                 }
1138
1139                 /* someone else has a share lock on it, check to see if we can
1140                  * too */
1141                 if (share_conflict(&lck->data->share_modes[i],
1142                                    access_mask, share_access)) {
1143
1144                         if (share_mode_stale_pid(lck->data, i)) {
1145                                 continue;
1146                         }
1147
1148                         *file_existed = true;
1149
1150                         return NT_STATUS_SHARING_VIOLATION;
1151                 }
1152         }
1153
1154         if (lck->data->num_share_modes != 0) {
1155                 *file_existed = true;
1156         }
1157
1158         return NT_STATUS_OK;
1159 }
1160
1161 /*
1162  * Send a break message to the oplock holder and delay the open for
1163  * our client.
1164  */
1165
1166 static NTSTATUS send_break_message(files_struct *fsp,
1167                                         struct share_mode_entry *exclusive,
1168                                         uint64_t mid,
1169                                         int oplock_request)
1170 {
1171         NTSTATUS status;
1172         char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
1173
1174         DEBUG(10, ("Sending break request to PID %s\n",
1175                    procid_str_static(&exclusive->pid)));
1176         exclusive->op_mid = mid;
1177
1178         /* Create the message. */
1179         share_mode_entry_to_message(msg, exclusive);
1180
1181         /* Add in the FORCE_OPLOCK_BREAK_TO_NONE bit in the message if set. We
1182            don't want this set in the share mode struct pointed to by lck. */
1183
1184         if (oplock_request & FORCE_OPLOCK_BREAK_TO_NONE) {
1185                 SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET,
1186                         exclusive->op_type | FORCE_OPLOCK_BREAK_TO_NONE);
1187         }
1188
1189         status = messaging_send_buf(fsp->conn->sconn->msg_ctx, exclusive->pid,
1190                                     MSG_SMB_BREAK_REQUEST,
1191                                     (uint8 *)msg,
1192                                     MSG_SMB_SHARE_MODE_ENTRY_SIZE);
1193         if (!NT_STATUS_IS_OK(status)) {
1194                 DEBUG(3, ("Could not send oplock break message: %s\n",
1195                           nt_errstr(status)));
1196         }
1197
1198         return status;
1199 }
1200
1201 /*
1202  * Return share_mode_entry pointers for :
1203  * 1). Batch oplock entry.
1204  * 2). Batch or exclusive oplock entry (may be identical to #1).
1205  * bool have_level2_oplock
1206  * bool have_no_oplock.
1207  * Do internal consistency checks on the share mode for a file.
1208  */
1209
1210 static void find_oplock_types(files_struct *fsp,
1211                                 int oplock_request,
1212                                 const struct share_mode_lock *lck,
1213                                 struct share_mode_entry **pp_batch,
1214                                 struct share_mode_entry **pp_ex_or_batch,
1215                                 bool *got_level2,
1216                                 bool *got_no_oplock)
1217 {
1218         int i;
1219
1220         *pp_batch = NULL;
1221         *pp_ex_or_batch = NULL;
1222         *got_level2 = false;
1223         *got_no_oplock = false;
1224
1225         /* Ignore stat or internal opens, as is done in
1226                 delay_for_batch_oplocks() and
1227                 delay_for_exclusive_oplocks().
1228          */
1229         if ((oplock_request & INTERNAL_OPEN_ONLY) || is_stat_open(fsp->access_mask)) {
1230                 return;
1231         }
1232
1233         for (i=0; i<lck->data->num_share_modes; i++) {
1234                 if (!is_valid_share_mode_entry(&lck->data->share_modes[i])) {
1235                         continue;
1236                 }
1237
1238                 if (lck->data->share_modes[i].op_type == NO_OPLOCK &&
1239                                 is_stat_open(lck->data->share_modes[i].access_mask)) {
1240                         /* We ignore stat opens in the table - they
1241                            always have NO_OPLOCK and never get or
1242                            cause breaks. JRA. */
1243                         continue;
1244                 }
1245
1246                 if (BATCH_OPLOCK_TYPE(lck->data->share_modes[i].op_type)) {
1247                         /* batch - can only be one. */
1248                         if (share_mode_stale_pid(lck->data, i)) {
1249                                 DEBUG(10, ("Found stale batch oplock\n"));
1250                                 continue;
1251                         }
1252                         if (*pp_ex_or_batch || *pp_batch || *got_level2 || *got_no_oplock) {
1253                                 smb_panic("Bad batch oplock entry.");
1254                         }
1255                         *pp_batch = &lck->data->share_modes[i];
1256                 }
1257
1258                 if (EXCLUSIVE_OPLOCK_TYPE(lck->data->share_modes[i].op_type)) {
1259                         if (share_mode_stale_pid(lck->data, i)) {
1260                                 DEBUG(10, ("Found stale duplicate oplock\n"));
1261                                 continue;
1262                         }
1263                         /* Exclusive or batch - can only be one. */
1264                         if (*pp_ex_or_batch || *got_level2 || *got_no_oplock) {
1265                                 smb_panic("Bad exclusive or batch oplock entry.");
1266                         }
1267                         *pp_ex_or_batch = &lck->data->share_modes[i];
1268                 }
1269
1270                 if (LEVEL_II_OPLOCK_TYPE(lck->data->share_modes[i].op_type)) {
1271                         if (*pp_batch || *pp_ex_or_batch) {
1272                                 if (share_mode_stale_pid(lck->data, i)) {
1273                                         DEBUG(10, ("Found stale LevelII "
1274                                                    "oplock\n"));
1275                                         continue;
1276                                 }
1277                                 smb_panic("Bad levelII oplock entry.");
1278                         }
1279                         *got_level2 = true;
1280                 }
1281
1282                 if (lck->data->share_modes[i].op_type == NO_OPLOCK) {
1283                         if (*pp_batch || *pp_ex_or_batch) {
1284                                 if (share_mode_stale_pid(lck->data, i)) {
1285                                         DEBUG(10, ("Found stale NO_OPLOCK "
1286                                                    "entry\n"));
1287                                         continue;
1288                                 }
1289                                 smb_panic("Bad no oplock entry.");
1290                         }
1291                         *got_no_oplock = true;
1292                 }
1293         }
1294 }
1295
1296 static bool delay_for_batch_oplocks(files_struct *fsp,
1297                                         uint64_t mid,
1298                                         int oplock_request,
1299                                         struct share_mode_entry *batch_entry)
1300 {
1301         if ((oplock_request & INTERNAL_OPEN_ONLY) || is_stat_open(fsp->access_mask)) {
1302                 return false;
1303         }
1304         if (batch_entry == NULL) {
1305                 return false;
1306         }
1307
1308         if (server_id_is_disconnected(&batch_entry->pid)) {
1309                 /*
1310                  * TODO: clean up.
1311                  * This could be achieved by sending a break message
1312                  * to ourselves. Special considerations for files
1313                  * with delete_on_close flag set!
1314                  *
1315                  * For now we keep it simple and do not
1316                  * allow delete on close for durable handles.
1317                  */
1318                 return false;
1319         }
1320
1321         /* Found a batch oplock */
1322         send_break_message(fsp, batch_entry, mid, oplock_request);
1323         return true;
1324 }
1325
1326 static bool delay_for_exclusive_oplocks(files_struct *fsp,
1327                                         uint64_t mid,
1328                                         int oplock_request,
1329                                         struct share_mode_entry *ex_entry)
1330 {
1331         if ((oplock_request & INTERNAL_OPEN_ONLY) || is_stat_open(fsp->access_mask)) {
1332                 return false;
1333         }
1334         if (ex_entry == NULL) {
1335                 return false;
1336         }
1337
1338         if (server_id_is_disconnected(&ex_entry->pid)) {
1339                 /*
1340                  * since only durable handles can get disconnected,
1341                  * and we can only get durable handles with batch oplocks,
1342                  * this should actually never be reached...
1343                  */
1344                 return false;
1345         }
1346
1347         send_break_message(fsp, ex_entry, mid, oplock_request);
1348         return true;
1349 }
1350
1351 static bool file_has_brlocks(files_struct *fsp)
1352 {
1353         struct byte_range_lock *br_lck;
1354
1355         br_lck = brl_get_locks_readonly(fsp);
1356         if (!br_lck)
1357                 return false;
1358
1359         return br_lck->num_locks > 0 ? true : false;
1360 }
1361
1362 static void grant_fsp_oplock_type(files_struct *fsp,
1363                                 int oplock_request,
1364                                 bool got_level2_oplock,
1365                                 bool got_a_none_oplock)
1366 {
1367         bool allow_level2 = (global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
1368                             lp_level2_oplocks(SNUM(fsp->conn));
1369
1370         /* Start by granting what the client asked for,
1371            but ensure no SAMBA_PRIVATE bits can be set. */
1372         fsp->oplock_type = (oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
1373
1374         if (oplock_request & INTERNAL_OPEN_ONLY) {
1375                 /* No oplocks on internal open. */
1376                 fsp->oplock_type = NO_OPLOCK;
1377                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1378                         fsp->oplock_type, fsp_str_dbg(fsp)));
1379                 return;
1380         }
1381
1382         if (lp_locking(fsp->conn->params) && file_has_brlocks(fsp)) {
1383                 DEBUG(10,("grant_fsp_oplock_type: file %s has byte range locks\n",
1384                         fsp_str_dbg(fsp)));
1385                 fsp->oplock_type = NO_OPLOCK;
1386         }
1387
1388         if (is_stat_open(fsp->access_mask)) {
1389                 /* Leave the value already set. */
1390                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1391                         fsp->oplock_type, fsp_str_dbg(fsp)));
1392                 return;
1393         }
1394
1395         /*
1396          * Match what was requested (fsp->oplock_type) with
1397          * what was found in the existing share modes.
1398          */
1399
1400         if (got_a_none_oplock) {
1401                 fsp->oplock_type = NO_OPLOCK;
1402         } else if (got_level2_oplock) {
1403                 if (fsp->oplock_type == NO_OPLOCK ||
1404                                 fsp->oplock_type == FAKE_LEVEL_II_OPLOCK) {
1405                         /* Store a level2 oplock, but don't tell the client */
1406                         fsp->oplock_type = FAKE_LEVEL_II_OPLOCK;
1407                 } else {
1408                         fsp->oplock_type = LEVEL_II_OPLOCK;
1409                 }
1410         } else {
1411                 /* All share_mode_entries are placeholders or deferred.
1412                  * Silently upgrade to fake levelII if the client didn't
1413                  * ask for an oplock. */
1414                 if (fsp->oplock_type == NO_OPLOCK) {
1415                         /* Store a level2 oplock, but don't tell the client */
1416                         fsp->oplock_type = FAKE_LEVEL_II_OPLOCK;
1417                 }
1418         }
1419
1420         /*
1421          * Don't grant level2 to clients that don't want them
1422          * or if we've turned them off.
1423          */
1424         if (fsp->oplock_type == LEVEL_II_OPLOCK && !allow_level2) {
1425                 fsp->oplock_type = FAKE_LEVEL_II_OPLOCK;
1426         }
1427
1428         DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1429                   fsp->oplock_type, fsp_str_dbg(fsp)));
1430 }
1431
1432 static bool request_timed_out(struct timeval request_time,
1433                               struct timeval timeout)
1434 {
1435         struct timeval now, end_time;
1436         GetTimeOfDay(&now);
1437         end_time = timeval_sum(&request_time, &timeout);
1438         return (timeval_compare(&end_time, &now) < 0);
1439 }
1440
1441 /****************************************************************************
1442  Handle the 1 second delay in returning a SHARING_VIOLATION error.
1443 ****************************************************************************/
1444
1445 static void defer_open(struct share_mode_lock *lck,
1446                        struct timeval request_time,
1447                        struct timeval timeout,
1448                        struct smb_request *req,
1449                        struct deferred_open_record *state)
1450 {
1451         struct server_id self = messaging_server_id(req->sconn->msg_ctx);
1452
1453         /* Paranoia check */
1454
1455         if (lck) {
1456                 int i;
1457
1458                 for (i=0; i<lck->data->num_share_modes; i++) {
1459                         struct share_mode_entry *e = &lck->data->share_modes[i];
1460
1461                         if (is_deferred_open_entry(e) &&
1462                             serverid_equal(&self, &e->pid) &&
1463                             (e->op_mid == req->mid)) {
1464                                 DEBUG(0, ("Trying to defer an already deferred "
1465                                         "request: mid=%llu, exiting\n",
1466                                         (unsigned long long)req->mid));
1467                                 exit_server("attempt to defer a deferred request");
1468                         }
1469                 }
1470         }
1471
1472         /* End paranoia check */
1473
1474         DEBUG(10,("defer_open_sharing_error: time [%u.%06u] adding deferred "
1475                   "open entry for mid %llu\n",
1476                   (unsigned int)request_time.tv_sec,
1477                   (unsigned int)request_time.tv_usec,
1478                   (unsigned long long)req->mid));
1479
1480         if (!push_deferred_open_message_smb(req, request_time, timeout,
1481                                        state->id, (char *)state, sizeof(*state))) {
1482                 exit_server("push_deferred_open_message_smb failed");
1483         }
1484         if (lck) {
1485                 add_deferred_open(lck, req->mid, request_time, self, state->id);
1486         }
1487 }
1488
1489
1490 /****************************************************************************
1491  On overwrite open ensure that the attributes match.
1492 ****************************************************************************/
1493
1494 static bool open_match_attributes(connection_struct *conn,
1495                                   uint32 old_dos_attr,
1496                                   uint32 new_dos_attr,
1497                                   mode_t existing_unx_mode,
1498                                   mode_t new_unx_mode,
1499                                   mode_t *returned_unx_mode)
1500 {
1501         uint32 noarch_old_dos_attr, noarch_new_dos_attr;
1502
1503         noarch_old_dos_attr = (old_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
1504         noarch_new_dos_attr = (new_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
1505
1506         if((noarch_old_dos_attr == 0 && noarch_new_dos_attr != 0) || 
1507            (noarch_old_dos_attr != 0 && ((noarch_old_dos_attr & noarch_new_dos_attr) == noarch_old_dos_attr))) {
1508                 *returned_unx_mode = new_unx_mode;
1509         } else {
1510                 *returned_unx_mode = (mode_t)0;
1511         }
1512
1513         DEBUG(10,("open_match_attributes: old_dos_attr = 0x%x, "
1514                   "existing_unx_mode = 0%o, new_dos_attr = 0x%x "
1515                   "returned_unx_mode = 0%o\n",
1516                   (unsigned int)old_dos_attr,
1517                   (unsigned int)existing_unx_mode,
1518                   (unsigned int)new_dos_attr,
1519                   (unsigned int)*returned_unx_mode ));
1520
1521         /* If we're mapping SYSTEM and HIDDEN ensure they match. */
1522         if (lp_map_system(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
1523                 if ((old_dos_attr & FILE_ATTRIBUTE_SYSTEM) &&
1524                     !(new_dos_attr & FILE_ATTRIBUTE_SYSTEM)) {
1525                         return False;
1526                 }
1527         }
1528         if (lp_map_hidden(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
1529                 if ((old_dos_attr & FILE_ATTRIBUTE_HIDDEN) &&
1530                     !(new_dos_attr & FILE_ATTRIBUTE_HIDDEN)) {
1531                         return False;
1532                 }
1533         }
1534         return True;
1535 }
1536
1537 /****************************************************************************
1538  Special FCB or DOS processing in the case of a sharing violation.
1539  Try and find a duplicated file handle.
1540 ****************************************************************************/
1541
1542 static NTSTATUS fcb_or_dos_open(struct smb_request *req,
1543                                 connection_struct *conn,
1544                                 files_struct *fsp_to_dup_into,
1545                                 const struct smb_filename *smb_fname,
1546                                 struct file_id id,
1547                                 uint16 file_pid,
1548                                 uint64_t vuid,
1549                                 uint32 access_mask,
1550                                 uint32 share_access,
1551                                 uint32 create_options)
1552 {
1553         files_struct *fsp;
1554
1555         DEBUG(5,("fcb_or_dos_open: attempting old open semantics for "
1556                  "file %s.\n", smb_fname_str_dbg(smb_fname)));
1557
1558         for(fsp = file_find_di_first(conn->sconn, id); fsp;
1559             fsp = file_find_di_next(fsp)) {
1560
1561                 DEBUG(10,("fcb_or_dos_open: checking file %s, fd = %d, "
1562                           "vuid = %llu, file_pid = %u, private_options = 0x%x "
1563                           "access_mask = 0x%x\n", fsp_str_dbg(fsp),
1564                           fsp->fh->fd, (unsigned long long)fsp->vuid,
1565                           (unsigned int)fsp->file_pid,
1566                           (unsigned int)fsp->fh->private_options,
1567                           (unsigned int)fsp->access_mask ));
1568
1569                 if (fsp->fh->fd != -1 &&
1570                     fsp->vuid == vuid &&
1571                     fsp->file_pid == file_pid &&
1572                     (fsp->fh->private_options & (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
1573                                                  NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
1574                     (fsp->access_mask & FILE_WRITE_DATA) &&
1575                     strequal(fsp->fsp_name->base_name, smb_fname->base_name) &&
1576                     strequal(fsp->fsp_name->stream_name,
1577                              smb_fname->stream_name)) {
1578                         DEBUG(10,("fcb_or_dos_open: file match\n"));
1579                         break;
1580                 }
1581         }
1582
1583         if (!fsp) {
1584                 return NT_STATUS_NOT_FOUND;
1585         }
1586
1587         /* quite an insane set of semantics ... */
1588         if (is_executable(smb_fname->base_name) &&
1589             (fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
1590                 DEBUG(10,("fcb_or_dos_open: file fail due to is_executable.\n"));
1591                 return NT_STATUS_INVALID_PARAMETER;
1592         }
1593
1594         /* We need to duplicate this fsp. */
1595         return dup_file_fsp(req, fsp, access_mask, share_access,
1596                             create_options, fsp_to_dup_into);
1597 }
1598
1599 static void schedule_defer_open(struct share_mode_lock *lck,
1600                                 struct timeval request_time,
1601                                 struct smb_request *req)
1602 {
1603         struct deferred_open_record state;
1604
1605         /* This is a relative time, added to the absolute
1606            request_time value to get the absolute timeout time.
1607            Note that if this is the second or greater time we enter
1608            this codepath for this particular request mid then
1609            request_time is left as the absolute time of the *first*
1610            time this request mid was processed. This is what allows
1611            the request to eventually time out. */
1612
1613         struct timeval timeout;
1614
1615         /* Normally the smbd we asked should respond within
1616          * OPLOCK_BREAK_TIMEOUT seconds regardless of whether
1617          * the client did, give twice the timeout as a safety
1618          * measure here in case the other smbd is stuck
1619          * somewhere else. */
1620
1621         timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
1622
1623         /* Nothing actually uses state.delayed_for_oplocks
1624            but it's handy to differentiate in debug messages
1625            between a 30 second delay due to oplock break, and
1626            a 1 second delay for share mode conflicts. */
1627
1628         state.delayed_for_oplocks = True;
1629         state.async_open = false;
1630         state.id = lck->data->id;
1631
1632         if (!request_timed_out(request_time, timeout)) {
1633                 defer_open(lck, request_time, timeout, req, &state);
1634         }
1635 }
1636
1637 /****************************************************************************
1638  Reschedule an open call that went asynchronous.
1639 ****************************************************************************/
1640
1641 static void schedule_async_open(struct timeval request_time,
1642                                 struct smb_request *req)
1643 {
1644         struct deferred_open_record state;
1645         struct timeval timeout;
1646
1647         timeout = timeval_set(20, 0);
1648
1649         ZERO_STRUCT(state);
1650         state.delayed_for_oplocks = false;
1651         state.async_open = true;
1652
1653         if (!request_timed_out(request_time, timeout)) {
1654                 defer_open(NULL, request_time, timeout, req, &state);
1655         }
1656 }
1657
1658 /****************************************************************************
1659  Work out what access_mask to use from what the client sent us.
1660 ****************************************************************************/
1661
1662 static NTSTATUS smbd_calculate_maximum_allowed_access(
1663         connection_struct *conn,
1664         const struct smb_filename *smb_fname,
1665         uint32_t *p_access_mask)
1666 {
1667         struct security_descriptor *sd;
1668         uint32_t access_granted;
1669         NTSTATUS status;
1670
1671         if (get_current_uid(conn) == (uid_t)0) {
1672                 *p_access_mask |= FILE_GENERIC_ALL;
1673                 return NT_STATUS_OK;
1674         }
1675
1676         status = SMB_VFS_GET_NT_ACL(conn, smb_fname->base_name,
1677                                     (SECINFO_OWNER |
1678                                      SECINFO_GROUP |
1679                                      SECINFO_DACL),&sd);
1680
1681         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1682                 /*
1683                  * File did not exist
1684                  */
1685                 *p_access_mask = FILE_GENERIC_ALL;
1686                 return NT_STATUS_OK;
1687         }
1688         if (!NT_STATUS_IS_OK(status)) {
1689                 DEBUG(10,("smbd_calculate_access_mask: "
1690                           "Could not get acl on file %s: %s\n",
1691                           smb_fname_str_dbg(smb_fname),
1692                           nt_errstr(status)));
1693                 return NT_STATUS_ACCESS_DENIED;
1694         }
1695
1696         /*
1697          * Never test FILE_READ_ATTRIBUTES. se_file_access_check()
1698          * also takes care of owner WRITE_DAC and READ_CONTROL.
1699          */
1700         status = se_file_access_check(sd,
1701                                  get_current_nttok(conn),
1702                                  false,
1703                                  (*p_access_mask & ~FILE_READ_ATTRIBUTES),
1704                                  &access_granted);
1705
1706         TALLOC_FREE(sd);
1707
1708         if (!NT_STATUS_IS_OK(status)) {
1709                 DEBUG(10, ("smbd_calculate_access_mask: "
1710                            "Access denied on file %s: "
1711                            "when calculating maximum access\n",
1712                            smb_fname_str_dbg(smb_fname)));
1713                 return NT_STATUS_ACCESS_DENIED;
1714         }
1715         *p_access_mask = (access_granted | FILE_READ_ATTRIBUTES);
1716         return NT_STATUS_OK;
1717 }
1718
1719 NTSTATUS smbd_calculate_access_mask(connection_struct *conn,
1720                                     const struct smb_filename *smb_fname,
1721                                     uint32_t access_mask,
1722                                     uint32_t *access_mask_out)
1723 {
1724         NTSTATUS status;
1725         uint32_t orig_access_mask = access_mask;
1726         uint32_t rejected_share_access;
1727
1728         /*
1729          * Convert GENERIC bits to specific bits.
1730          */
1731
1732         se_map_generic(&access_mask, &file_generic_mapping);
1733
1734         /* Calculate MAXIMUM_ALLOWED_ACCESS if requested. */
1735         if (access_mask & MAXIMUM_ALLOWED_ACCESS) {
1736
1737                 status = smbd_calculate_maximum_allowed_access(
1738                         conn, smb_fname, &access_mask);
1739
1740                 if (!NT_STATUS_IS_OK(status)) {
1741                         return status;
1742                 }
1743
1744                 access_mask &= conn->share_access;
1745         }
1746
1747         rejected_share_access = access_mask & ~(conn->share_access);
1748
1749         if (rejected_share_access) {
1750                 DEBUG(10, ("smbd_calculate_access_mask: Access denied on "
1751                         "file %s: rejected by share access mask[0x%08X] "
1752                         "orig[0x%08X] mapped[0x%08X] reject[0x%08X]\n",
1753                         smb_fname_str_dbg(smb_fname),
1754                         conn->share_access,
1755                         orig_access_mask, access_mask,
1756                         rejected_share_access));
1757                 return NT_STATUS_ACCESS_DENIED;
1758         }
1759
1760         *access_mask_out = access_mask;
1761         return NT_STATUS_OK;
1762 }
1763
1764 /****************************************************************************
1765  Remove the deferred open entry under lock.
1766 ****************************************************************************/
1767
1768 void remove_deferred_open_entry(struct file_id id, uint64_t mid,
1769                                 struct server_id pid)
1770 {
1771         struct share_mode_lock *lck = get_existing_share_mode_lock(
1772                 talloc_tos(), id);
1773         if (lck == NULL) {
1774                 DEBUG(0, ("could not get share mode lock\n"));
1775                 return;
1776         }
1777         del_deferred_open_entry(lck, mid, pid);
1778         TALLOC_FREE(lck);
1779 }
1780
1781 /****************************************************************************
1782  Return true if this is a state pointer to an asynchronous create.
1783 ****************************************************************************/
1784
1785 bool is_deferred_open_async(const void *ptr)
1786 {
1787         const struct deferred_open_record *state = (const struct deferred_open_record *)ptr;
1788
1789         return state->async_open;
1790 }
1791
1792 static bool clear_ads(uint32_t create_disposition)
1793 {
1794         bool ret = false;
1795
1796         switch (create_disposition) {
1797         case FILE_SUPERSEDE:
1798         case FILE_OVERWRITE_IF:
1799         case FILE_OVERWRITE:
1800                 ret = true;
1801                 break;
1802         default:
1803                 break;
1804         }
1805         return ret;
1806 }
1807
1808 static int disposition_to_open_flags(uint32_t create_disposition)
1809 {
1810         int ret = 0;
1811
1812         /*
1813          * Currently we're using FILE_SUPERSEDE as the same as
1814          * FILE_OVERWRITE_IF but they really are
1815          * different. FILE_SUPERSEDE deletes an existing file
1816          * (requiring delete access) then recreates it.
1817          */
1818
1819         switch (create_disposition) {
1820         case FILE_SUPERSEDE:
1821         case FILE_OVERWRITE_IF:
1822                 /*
1823                  * If file exists replace/overwrite. If file doesn't
1824                  * exist create.
1825                  */
1826                 ret = O_CREAT|O_TRUNC;
1827                 break;
1828
1829         case FILE_OPEN:
1830                 /*
1831                  * If file exists open. If file doesn't exist error.
1832                  */
1833                 ret = 0;
1834                 break;
1835
1836         case FILE_OVERWRITE:
1837                 /*
1838                  * If file exists overwrite. If file doesn't exist
1839                  * error.
1840                  */
1841                 ret = O_TRUNC;
1842                 break;
1843
1844         case FILE_CREATE:
1845                 /*
1846                  * If file exists error. If file doesn't exist create.
1847                  */
1848                 ret = O_CREAT|O_EXCL;
1849                 break;
1850
1851         case FILE_OPEN_IF:
1852                 /*
1853                  * If file exists open. If file doesn't exist create.
1854                  */
1855                 ret = O_CREAT;
1856                 break;
1857         }
1858         return ret;
1859 }
1860
1861 /****************************************************************************
1862  Open a file with a share mode. Passed in an already created files_struct *.
1863 ****************************************************************************/
1864
1865 static NTSTATUS open_file_ntcreate(connection_struct *conn,
1866                             struct smb_request *req,
1867                             uint32 access_mask,         /* access bits (FILE_READ_DATA etc.) */
1868                             uint32 share_access,        /* share constants (FILE_SHARE_READ etc) */
1869                             uint32 create_disposition,  /* FILE_OPEN_IF etc. */
1870                             uint32 create_options,      /* options such as delete on close. */
1871                             uint32 new_dos_attributes,  /* attributes used for new file. */
1872                             int oplock_request,         /* internal Samba oplock codes. */
1873                                                         /* Information (FILE_EXISTS etc.) */
1874                             uint32_t private_flags,     /* Samba specific flags. */
1875                             int *pinfo,
1876                             files_struct *fsp)
1877 {
1878         struct smb_filename *smb_fname = fsp->fsp_name;
1879         int flags=0;
1880         int flags2=0;
1881         bool file_existed = VALID_STAT(smb_fname->st);
1882         bool def_acl = False;
1883         bool posix_open = False;
1884         bool new_file_created = False;
1885         NTSTATUS fsp_open = NT_STATUS_ACCESS_DENIED;
1886         mode_t new_unx_mode = (mode_t)0;
1887         mode_t unx_mode = (mode_t)0;
1888         int info;
1889         uint32 existing_dos_attributes = 0;
1890         struct timeval request_time = timeval_zero();
1891         struct share_mode_lock *lck = NULL;
1892         uint32 open_access_mask = access_mask;
1893         NTSTATUS status;
1894         char *parent_dir;
1895         SMB_STRUCT_STAT saved_stat = smb_fname->st;
1896
1897         if (conn->printer) {
1898                 /*
1899                  * Printers are handled completely differently.
1900                  * Most of the passed parameters are ignored.
1901                  */
1902
1903                 if (pinfo) {
1904                         *pinfo = FILE_WAS_CREATED;
1905                 }
1906
1907                 DEBUG(10, ("open_file_ntcreate: printer open fname=%s\n",
1908                            smb_fname_str_dbg(smb_fname)));
1909
1910                 if (!req) {
1911                         DEBUG(0,("open_file_ntcreate: printer open without "
1912                                 "an SMB request!\n"));
1913                         return NT_STATUS_INTERNAL_ERROR;
1914                 }
1915
1916                 return print_spool_open(fsp, smb_fname->base_name,
1917                                         req->vuid);
1918         }
1919
1920         if (!parent_dirname(talloc_tos(), smb_fname->base_name, &parent_dir,
1921                             NULL)) {
1922                 return NT_STATUS_NO_MEMORY;
1923         }
1924
1925         if (new_dos_attributes & FILE_FLAG_POSIX_SEMANTICS) {
1926                 posix_open = True;
1927                 unx_mode = (mode_t)(new_dos_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
1928                 new_dos_attributes = 0;
1929         } else {
1930                 /* Windows allows a new file to be created and
1931                    silently removes a FILE_ATTRIBUTE_DIRECTORY
1932                    sent by the client. Do the same. */
1933
1934                 new_dos_attributes &= ~FILE_ATTRIBUTE_DIRECTORY;
1935
1936                 /* We add FILE_ATTRIBUTE_ARCHIVE to this as this mode is only used if the file is
1937                  * created new. */
1938                 unx_mode = unix_mode(conn, new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
1939                                      smb_fname, parent_dir);
1940         }
1941
1942         DEBUG(10, ("open_file_ntcreate: fname=%s, dos_attrs=0x%x "
1943                    "access_mask=0x%x share_access=0x%x "
1944                    "create_disposition = 0x%x create_options=0x%x "
1945                    "unix mode=0%o oplock_request=%d private_flags = 0x%x\n",
1946                    smb_fname_str_dbg(smb_fname), new_dos_attributes,
1947                    access_mask, share_access, create_disposition,
1948                    create_options, (unsigned int)unx_mode, oplock_request,
1949                    (unsigned int)private_flags));
1950
1951         if ((req == NULL) && ((oplock_request & INTERNAL_OPEN_ONLY) == 0)) {
1952                 DEBUG(0, ("No smb request but not an internal only open!\n"));
1953                 return NT_STATUS_INTERNAL_ERROR;
1954         }
1955
1956         /*
1957          * Only non-internal opens can be deferred at all
1958          */
1959
1960         if (req) {
1961                 void *ptr;
1962                 if (get_deferred_open_message_state(req,
1963                                 &request_time,
1964                                 &ptr)) {
1965                         /* Remember the absolute time of the original
1966                            request with this mid. We'll use it later to
1967                            see if this has timed out. */
1968
1969                         /* If it was an async create retry, the file
1970                            didn't exist. */
1971
1972                         if (is_deferred_open_async(ptr)) {
1973                                 SET_STAT_INVALID(smb_fname->st);
1974                                 file_existed = false;
1975                         } else {
1976                                 struct deferred_open_record *state = (struct deferred_open_record *)ptr;
1977                                 /* Remove the deferred open entry under lock. */
1978                                 remove_deferred_open_entry(
1979                                         state->id, req->mid,
1980                                         messaging_server_id(req->sconn->msg_ctx));
1981                         }
1982
1983                         /* Ensure we don't reprocess this message. */
1984                         remove_deferred_open_message_smb(req->sconn, req->mid);
1985                 }
1986         }
1987
1988         if (!posix_open) {
1989                 new_dos_attributes &= SAMBA_ATTRIBUTES_MASK;
1990                 if (file_existed) {
1991                         existing_dos_attributes = dos_mode(conn, smb_fname);
1992                 }
1993         }
1994
1995         /* ignore any oplock requests if oplocks are disabled */
1996         if (!lp_oplocks(SNUM(conn)) ||
1997             IS_VETO_OPLOCK_PATH(conn, smb_fname->base_name)) {
1998                 /* Mask off everything except the private Samba bits. */
1999                 oplock_request &= SAMBA_PRIVATE_OPLOCK_MASK;
2000         }
2001
2002         /* this is for OS/2 long file names - say we don't support them */
2003         if (!lp_posix_pathnames() && strstr(smb_fname->base_name,".+,;=[].")) {
2004                 /* OS/2 Workplace shell fix may be main code stream in a later
2005                  * release. */
2006                 DEBUG(5,("open_file_ntcreate: OS/2 long filenames are not "
2007                          "supported.\n"));
2008                 if (use_nt_status()) {
2009                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2010                 }
2011                 return NT_STATUS_DOS(ERRDOS, ERRcannotopen);
2012         }
2013
2014         switch( create_disposition ) {
2015                 case FILE_OPEN:
2016                         /* If file exists open. If file doesn't exist error. */
2017                         if (!file_existed) {
2018                                 DEBUG(5,("open_file_ntcreate: FILE_OPEN "
2019                                          "requested for file %s and file "
2020                                          "doesn't exist.\n",
2021                                          smb_fname_str_dbg(smb_fname)));
2022                                 errno = ENOENT;
2023                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2024                         }
2025                         break;
2026
2027                 case FILE_OVERWRITE:
2028                         /* If file exists overwrite. If file doesn't exist
2029                          * error. */
2030                         if (!file_existed) {
2031                                 DEBUG(5,("open_file_ntcreate: FILE_OVERWRITE "
2032                                          "requested for file %s and file "
2033                                          "doesn't exist.\n",
2034                                          smb_fname_str_dbg(smb_fname) ));
2035                                 errno = ENOENT;
2036                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2037                         }
2038                         break;
2039
2040                 case FILE_CREATE:
2041                         /* If file exists error. If file doesn't exist
2042                          * create. */
2043                         if (file_existed) {
2044                                 DEBUG(5,("open_file_ntcreate: FILE_CREATE "
2045                                          "requested for file %s and file "
2046                                          "already exists.\n",
2047                                          smb_fname_str_dbg(smb_fname)));
2048                                 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
2049                                         errno = EISDIR;
2050                                 } else {
2051                                         errno = EEXIST;
2052                                 }
2053                                 return map_nt_error_from_unix(errno);
2054                         }
2055                         break;
2056
2057                 case FILE_SUPERSEDE:
2058                 case FILE_OVERWRITE_IF:
2059                 case FILE_OPEN_IF:
2060                         break;
2061                 default:
2062                         return NT_STATUS_INVALID_PARAMETER;
2063         }
2064
2065         flags2 = disposition_to_open_flags(create_disposition);
2066
2067         /* We only care about matching attributes on file exists and
2068          * overwrite. */
2069
2070         if (!posix_open && file_existed &&
2071             ((create_disposition == FILE_OVERWRITE) ||
2072              (create_disposition == FILE_OVERWRITE_IF))) {
2073                 if (!open_match_attributes(conn, existing_dos_attributes,
2074                                            new_dos_attributes,
2075                                            smb_fname->st.st_ex_mode,
2076                                            unx_mode, &new_unx_mode)) {
2077                         DEBUG(5,("open_file_ntcreate: attributes missmatch "
2078                                  "for file %s (%x %x) (0%o, 0%o)\n",
2079                                  smb_fname_str_dbg(smb_fname),
2080                                  existing_dos_attributes,
2081                                  new_dos_attributes,
2082                                  (unsigned int)smb_fname->st.st_ex_mode,
2083                                  (unsigned int)unx_mode ));
2084                         errno = EACCES;
2085                         return NT_STATUS_ACCESS_DENIED;
2086                 }
2087         }
2088
2089         status = smbd_calculate_access_mask(conn, smb_fname,
2090                                         access_mask,
2091                                         &access_mask); 
2092         if (!NT_STATUS_IS_OK(status)) {
2093                 DEBUG(10, ("open_file_ntcreate: smbd_calculate_access_mask "
2094                         "on file %s returned %s\n",
2095                         smb_fname_str_dbg(smb_fname), nt_errstr(status)));
2096                 return status;
2097         }
2098
2099         open_access_mask = access_mask;
2100
2101         if ((flags2 & O_TRUNC) || (oplock_request & FORCE_OPLOCK_BREAK_TO_NONE)) {
2102                 open_access_mask |= FILE_WRITE_DATA; /* This will cause oplock breaks. */
2103         }
2104
2105         DEBUG(10, ("open_file_ntcreate: fname=%s, after mapping "
2106                    "access_mask=0x%x\n", smb_fname_str_dbg(smb_fname),
2107                     access_mask));
2108
2109         /*
2110          * Note that we ignore the append flag as append does not
2111          * mean the same thing under DOS and Unix.
2112          */
2113
2114         if ((access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) ||
2115                         (oplock_request & FORCE_OPLOCK_BREAK_TO_NONE)) {
2116                 /* DENY_DOS opens are always underlying read-write on the
2117                    file handle, no matter what the requested access mask
2118                     says. */
2119                 if ((private_flags & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS) ||
2120                         access_mask & (FILE_READ_ATTRIBUTES|FILE_READ_DATA|FILE_READ_EA|FILE_EXECUTE)) {
2121                         flags = O_RDWR;
2122                 } else {
2123                         flags = O_WRONLY;
2124                 }
2125         } else {
2126                 flags = O_RDONLY;
2127         }
2128
2129         /*
2130          * Currently we only look at FILE_WRITE_THROUGH for create options.
2131          */
2132
2133 #if defined(O_SYNC)
2134         if ((create_options & FILE_WRITE_THROUGH) && lp_strict_sync(SNUM(conn))) {
2135                 flags2 |= O_SYNC;
2136         }
2137 #endif /* O_SYNC */
2138
2139         if (posix_open && (access_mask & FILE_APPEND_DATA)) {
2140                 flags2 |= O_APPEND;
2141         }
2142
2143         if (!posix_open && !CAN_WRITE(conn)) {
2144                 /*
2145                  * We should really return a permission denied error if either
2146                  * O_CREAT or O_TRUNC are set, but for compatibility with
2147                  * older versions of Samba we just AND them out.
2148                  */
2149                 flags2 &= ~(O_CREAT|O_TRUNC);
2150         }
2151
2152         /*
2153          * Ensure we can't write on a read-only share or file.
2154          */
2155
2156         if (flags != O_RDONLY && file_existed &&
2157             (!CAN_WRITE(conn) || IS_DOS_READONLY(existing_dos_attributes))) {
2158                 DEBUG(5,("open_file_ntcreate: write access requested for "
2159                          "file %s on read only %s\n",
2160                          smb_fname_str_dbg(smb_fname),
2161                          !CAN_WRITE(conn) ? "share" : "file" ));
2162                 errno = EACCES;
2163                 return NT_STATUS_ACCESS_DENIED;
2164         }
2165
2166         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
2167         fsp->share_access = share_access;
2168         fsp->fh->private_options = private_flags;
2169         fsp->access_mask = open_access_mask; /* We change this to the
2170                                               * requested access_mask after
2171                                               * the open is done. */
2172         fsp->posix_open = posix_open;
2173
2174         /* Ensure no SAMBA_PRIVATE bits can be set. */
2175         fsp->oplock_type = (oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
2176
2177         if (timeval_is_zero(&request_time)) {
2178                 request_time = fsp->open_time;
2179         }
2180
2181         if (file_existed) {
2182                 struct share_mode_entry *batch_entry = NULL;
2183                 struct share_mode_entry *exclusive_entry = NULL;
2184                 bool got_level2_oplock = false;
2185                 bool got_a_none_oplock = false;
2186                 struct file_id id;
2187
2188                 struct timespec old_write_time = smb_fname->st.st_ex_mtime;
2189                 id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
2190
2191                 lck = get_share_mode_lock(talloc_tos(), id,
2192                                           conn->connectpath,
2193                                           smb_fname, &old_write_time);
2194                 if (lck == NULL) {
2195                         DEBUG(0, ("Could not get share mode lock\n"));
2196                         return NT_STATUS_SHARING_VIOLATION;
2197                 }
2198
2199                 /* Get the types we need to examine. */
2200                 find_oplock_types(fsp,
2201                                 oplock_request,
2202                                 lck,
2203                                 &batch_entry,
2204                                 &exclusive_entry,
2205                                 &got_level2_oplock,
2206                                 &got_a_none_oplock);
2207
2208                 /* First pass - send break only on batch oplocks. */
2209                 if ((req != NULL) &&
2210                                 delay_for_batch_oplocks(fsp,
2211                                         req->mid,
2212                                         oplock_request,
2213                                         batch_entry)) {
2214                         schedule_defer_open(lck, request_time, req);
2215                         TALLOC_FREE(lck);
2216                         return NT_STATUS_SHARING_VIOLATION;
2217                 }
2218
2219                 /* Use the client requested access mask here, not the one we
2220                  * open with. */
2221                 status = open_mode_check(conn, lck, fsp->name_hash,
2222                                         access_mask, share_access,
2223                                          create_options, &file_existed);
2224
2225                 if (NT_STATUS_IS_OK(status)) {
2226                         /* We might be going to allow this open. Check oplock
2227                          * status again. */
2228                         /* Second pass - send break for both batch or
2229                          * exclusive oplocks. */
2230                         if ((req != NULL) &&
2231                                         delay_for_exclusive_oplocks(
2232                                                 fsp,
2233                                                 req->mid,
2234                                                 oplock_request,
2235                                                 exclusive_entry)) {
2236                                 schedule_defer_open(lck, request_time, req);
2237                                 TALLOC_FREE(lck);
2238                                 return NT_STATUS_SHARING_VIOLATION;
2239                         }
2240                 }
2241
2242                 if (NT_STATUS_EQUAL(status, NT_STATUS_DELETE_PENDING)) {
2243                         /* DELETE_PENDING is not deferred for a second */
2244                         TALLOC_FREE(lck);
2245                         return status;
2246                 }
2247
2248                 grant_fsp_oplock_type(fsp,
2249                                 oplock_request,
2250                                 got_level2_oplock,
2251                                 got_a_none_oplock);
2252
2253                 if (!NT_STATUS_IS_OK(status)) {
2254                         uint32 can_access_mask;
2255                         bool can_access = True;
2256
2257                         SMB_ASSERT(NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION));
2258
2259                         /* Check if this can be done with the deny_dos and fcb
2260                          * calls. */
2261                         if (private_flags &
2262                             (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS|
2263                              NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) {
2264                                 if (req == NULL) {
2265                                         DEBUG(0, ("DOS open without an SMB "
2266                                                   "request!\n"));
2267                                         TALLOC_FREE(lck);
2268                                         return NT_STATUS_INTERNAL_ERROR;
2269                                 }
2270
2271                                 /* Use the client requested access mask here,
2272                                  * not the one we open with. */
2273                                 status = fcb_or_dos_open(req,
2274                                                         conn,
2275                                                         fsp,
2276                                                         smb_fname,
2277                                                         id,
2278                                                         req->smbpid,
2279                                                         req->vuid,
2280                                                         access_mask,
2281                                                         share_access,
2282                                                         create_options);
2283
2284                                 if (NT_STATUS_IS_OK(status)) {
2285                                         TALLOC_FREE(lck);
2286                                         if (pinfo) {
2287                                                 *pinfo = FILE_WAS_OPENED;
2288                                         }
2289                                         return NT_STATUS_OK;
2290                                 }
2291                         }
2292
2293                         /*
2294                          * This next line is a subtlety we need for
2295                          * MS-Access. If a file open will fail due to share
2296                          * permissions and also for security (access) reasons,
2297                          * we need to return the access failed error, not the
2298                          * share error. We can't open the file due to kernel
2299                          * oplock deadlock (it's possible we failed above on
2300                          * the open_mode_check()) so use a userspace check.
2301                          */
2302
2303                         if (flags & O_RDWR) {
2304                                 can_access_mask = FILE_READ_DATA|FILE_WRITE_DATA;
2305                         } else if (flags & O_WRONLY) {
2306                                 can_access_mask = FILE_WRITE_DATA;
2307                         } else {
2308                                 can_access_mask = FILE_READ_DATA;
2309                         }
2310
2311                         if (((can_access_mask & FILE_WRITE_DATA) &&
2312                                 !CAN_WRITE(conn)) ||
2313                                 !NT_STATUS_IS_OK(smbd_check_access_rights(conn,
2314                                                         smb_fname,
2315                                                         false,
2316                                                         can_access_mask))) {
2317                                 can_access = False;
2318                         }
2319
2320                         /*
2321                          * If we're returning a share violation, ensure we
2322                          * cope with the braindead 1 second delay.
2323                          */
2324
2325                         if (!(oplock_request & INTERNAL_OPEN_ONLY) &&
2326                             lp_defer_sharing_violations()) {
2327                                 struct timeval timeout;
2328                                 struct deferred_open_record state;
2329                                 int timeout_usecs;
2330
2331                                 /* this is a hack to speed up torture tests
2332                                    in 'make test' */
2333                                 timeout_usecs = lp_parm_int(SNUM(conn),
2334                                                             "smbd","sharedelay",
2335                                                             SHARING_VIOLATION_USEC_WAIT);
2336
2337                                 /* This is a relative time, added to the absolute
2338                                    request_time value to get the absolute timeout time.
2339                                    Note that if this is the second or greater time we enter
2340                                    this codepath for this particular request mid then
2341                                    request_time is left as the absolute time of the *first*
2342                                    time this request mid was processed. This is what allows
2343                                    the request to eventually time out. */
2344
2345                                 timeout = timeval_set(0, timeout_usecs);
2346
2347                                 /* Nothing actually uses state.delayed_for_oplocks
2348                                    but it's handy to differentiate in debug messages
2349                                    between a 30 second delay due to oplock break, and
2350                                    a 1 second delay for share mode conflicts. */
2351
2352                                 state.delayed_for_oplocks = False;
2353                                 state.async_open = false;
2354                                 state.id = id;
2355
2356                                 if ((req != NULL)
2357                                     && !request_timed_out(request_time,
2358                                                           timeout)) {
2359                                         defer_open(lck, request_time, timeout,
2360                                                    req, &state);
2361                                 }
2362                         }
2363
2364                         TALLOC_FREE(lck);
2365                         if (can_access) {
2366                                 /*
2367                                  * We have detected a sharing violation here
2368                                  * so return the correct error code
2369                                  */
2370                                 status = NT_STATUS_SHARING_VIOLATION;
2371                         } else {
2372                                 status = NT_STATUS_ACCESS_DENIED;
2373                         }
2374                         return status;
2375                 }
2376
2377                 /*
2378                  * We exit this block with the share entry *locked*.....
2379                  */
2380         }
2381
2382         SMB_ASSERT(!file_existed || (lck != NULL));
2383
2384         /*
2385          * Ensure we pay attention to default ACLs on directories if required.
2386          */
2387
2388         if ((flags2 & O_CREAT) && lp_inherit_acls(SNUM(conn)) &&
2389             (def_acl = directory_has_default_acl(conn, parent_dir))) {
2390                 unx_mode = (0777 & lp_create_mask(SNUM(conn)));
2391         }
2392
2393         DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o, "
2394                 "access_mask = 0x%x, open_access_mask = 0x%x\n",
2395                  (unsigned int)flags, (unsigned int)flags2,
2396                  (unsigned int)unx_mode, (unsigned int)access_mask,
2397                  (unsigned int)open_access_mask));
2398
2399         fsp_open = open_file(fsp, conn, req, parent_dir,
2400                              flags|flags2, unx_mode, access_mask,
2401                              open_access_mask, &new_file_created);
2402
2403         if (!NT_STATUS_IS_OK(fsp_open)) {
2404                 if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_RETRY)) {
2405                         schedule_async_open(request_time, req);
2406                 }
2407                 TALLOC_FREE(lck);
2408                 return fsp_open;
2409         }
2410
2411         if (file_existed && !check_same_dev_ino(&saved_stat, &smb_fname->st)) {
2412                 /*
2413                  * The file did exist, but some other (local or NFS)
2414                  * process either renamed/unlinked and re-created the
2415                  * file with different dev/ino after we walked the path,
2416                  * but before we did the open. We could retry the
2417                  * open but it's a rare enough case it's easier to
2418                  * just fail the open to prevent creating any problems
2419                  * in the open file db having the wrong dev/ino key.
2420                  */
2421                 TALLOC_FREE(lck);
2422                 fd_close(fsp);
2423                 DEBUG(1,("open_file_ntcreate: file %s - dev/ino mismatch. "
2424                         "Old (dev=0x%llu, ino =0x%llu). "
2425                         "New (dev=0x%llu, ino=0x%llu). Failing open "
2426                         " with NT_STATUS_ACCESS_DENIED.\n",
2427                          smb_fname_str_dbg(smb_fname),
2428                          (unsigned long long)saved_stat.st_ex_dev,
2429                          (unsigned long long)saved_stat.st_ex_ino,
2430                          (unsigned long long)smb_fname->st.st_ex_dev,
2431                          (unsigned long long)smb_fname->st.st_ex_ino));
2432                 return NT_STATUS_ACCESS_DENIED;
2433         }
2434
2435         if (!file_existed) {
2436                 struct share_mode_entry *batch_entry = NULL;
2437                 struct share_mode_entry *exclusive_entry = NULL;
2438                 bool got_level2_oplock = false;
2439                 bool got_a_none_oplock = false;
2440                 struct timespec old_write_time = smb_fname->st.st_ex_mtime;
2441                 struct file_id id;
2442                 /*
2443                  * Deal with the race condition where two smbd's detect the
2444                  * file doesn't exist and do the create at the same time. One
2445                  * of them will win and set a share mode, the other (ie. this
2446                  * one) should check if the requested share mode for this
2447                  * create is allowed.
2448                  */
2449
2450                 /*
2451                  * Now the file exists and fsp is successfully opened,
2452                  * fsp->dev and fsp->inode are valid and should replace the
2453                  * dev=0,inode=0 from a non existent file. Spotted by
2454                  * Nadav Danieli <nadavd@exanet.com>. JRA.
2455                  */
2456
2457                 id = fsp->file_id;
2458
2459                 lck = get_share_mode_lock(talloc_tos(), id,
2460                                           conn->connectpath,
2461                                           smb_fname, &old_write_time);
2462
2463                 if (lck == NULL) {
2464                         DEBUG(0, ("open_file_ntcreate: Could not get share "
2465                                   "mode lock for %s\n",
2466                                   smb_fname_str_dbg(smb_fname)));
2467                         fd_close(fsp);
2468                         return NT_STATUS_SHARING_VIOLATION;
2469                 }
2470
2471                 /* Get the types we need to examine. */
2472                 find_oplock_types(fsp,
2473                                 oplock_request,
2474                                 lck,
2475                                 &batch_entry,
2476                                 &exclusive_entry,
2477                                 &got_level2_oplock,
2478                                 &got_a_none_oplock);
2479
2480                 /* First pass - send break only on batch oplocks. */
2481                 if ((req != NULL) &&
2482                                 delay_for_batch_oplocks(fsp,
2483                                         req->mid,
2484                                         oplock_request,
2485                                         batch_entry)) {
2486                         schedule_defer_open(lck, request_time, req);
2487                         TALLOC_FREE(lck);
2488                         fd_close(fsp);
2489                         return NT_STATUS_SHARING_VIOLATION;
2490                 }
2491
2492                 status = open_mode_check(conn, lck, fsp->name_hash,
2493                                         access_mask, share_access,
2494                                          create_options, &file_existed);
2495
2496                 if (NT_STATUS_IS_OK(status)) {
2497                         /* We might be going to allow this open. Check oplock
2498                          * status again. */
2499                         /* Second pass - send break for both batch or
2500                          * exclusive oplocks. */
2501                         if ((req != NULL) &&
2502                                         delay_for_exclusive_oplocks(
2503                                                 fsp,
2504                                                 req->mid,
2505                                                 oplock_request,
2506                                                 exclusive_entry)) {
2507                                 schedule_defer_open(lck, request_time, req);
2508                                 TALLOC_FREE(lck);
2509                                 fd_close(fsp);
2510                                 return NT_STATUS_SHARING_VIOLATION;
2511                         }
2512                 }
2513
2514                 if (!NT_STATUS_IS_OK(status)) {
2515                         struct deferred_open_record state;
2516
2517                         state.delayed_for_oplocks = False;
2518                         state.async_open = false;
2519                         state.id = id;
2520
2521                         /* Do it all over again immediately. In the second
2522                          * round we will find that the file existed and handle
2523                          * the DELETE_PENDING and FCB cases correctly. No need
2524                          * to duplicate the code here. Essentially this is a
2525                          * "goto top of this function", but don't tell
2526                          * anybody... */
2527
2528                         if (req != NULL) {
2529                                 defer_open(lck, request_time, timeval_zero(),
2530                                            req, &state);
2531                         }
2532                         TALLOC_FREE(lck);
2533                         fd_close(fsp);
2534                         return status;
2535                 }
2536
2537                 grant_fsp_oplock_type(fsp,
2538                                 oplock_request,
2539                                 got_level2_oplock,
2540                                 got_a_none_oplock);
2541
2542                 /*
2543                  * We exit this block with the share entry *locked*.....
2544                  */
2545
2546         }
2547
2548         SMB_ASSERT(lck != NULL);
2549
2550         /* Delete streams if create_disposition requires it */
2551         if (!new_file_created && clear_ads(create_disposition) &&
2552             !is_ntfs_stream_smb_fname(smb_fname)) {
2553                 status = delete_all_streams(conn, smb_fname->base_name);
2554                 if (!NT_STATUS_IS_OK(status)) {
2555                         TALLOC_FREE(lck);
2556                         fd_close(fsp);
2557                         return status;
2558                 }
2559         }
2560
2561         /* note that we ignore failure for the following. It is
2562            basically a hack for NFS, and NFS will never set one of
2563            these only read them. Nobody but Samba can ever set a deny
2564            mode and we have already checked our more authoritative
2565            locking database for permission to set this deny mode. If
2566            the kernel refuses the operations then the kernel is wrong.
2567            note that GPFS supports it as well - jmcd */
2568
2569         if (fsp->fh->fd != -1 && lp_kernel_share_modes(SNUM(conn))) {
2570                 int ret_flock;
2571                 ret_flock = SMB_VFS_KERNEL_FLOCK(fsp, share_access, access_mask);
2572                 if(ret_flock == -1 ){
2573
2574                         TALLOC_FREE(lck);
2575                         fd_close(fsp);
2576
2577                         return NT_STATUS_SHARING_VIOLATION;
2578                 }
2579         }
2580
2581         /*
2582          * At this point onwards, we can guarentee that the share entry
2583          * is locked, whether we created the file or not, and that the
2584          * deny mode is compatible with all current opens.
2585          */
2586
2587         /*
2588          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
2589          * but we don't have to store this - just ignore it on access check.
2590          */
2591         if (conn->sconn->using_smb2) {
2592                 /*
2593                  * SMB2 doesn't return it (according to Microsoft tests).
2594                  * Test Case: TestSuite_ScenarioNo009GrantedAccessTestS0
2595                  * File created with access = 0x7 (Read, Write, Delete)
2596                  * Query Info on file returns 0x87 (Read, Write, Delete, Read Attributes)
2597                  */
2598                 fsp->access_mask = access_mask;
2599         } else {
2600                 /* But SMB1 does. */
2601                 fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
2602         }
2603
2604         if (file_existed) {
2605                 /* stat opens on existing files don't get oplocks. */
2606                 if (is_stat_open(open_access_mask)) {
2607                         fsp->oplock_type = NO_OPLOCK;
2608                 }
2609         }
2610
2611         if (new_file_created) {
2612                 info = FILE_WAS_CREATED;
2613         } else {
2614                 if (flags2 & O_TRUNC) {
2615                         info = FILE_WAS_OVERWRITTEN;
2616                 } else {
2617                         info = FILE_WAS_OPENED;
2618                 }
2619         }
2620
2621         if (pinfo) {
2622                 *pinfo = info;
2623         }
2624
2625         /*
2626          * Setup the oplock info in both the shared memory and
2627          * file structs.
2628          */
2629
2630         status = set_file_oplock(fsp, fsp->oplock_type);
2631         if (!NT_STATUS_IS_OK(status)) {
2632                 /*
2633                  * Could not get the kernel oplock or there are byte-range
2634                  * locks on the file.
2635                  */
2636                 fsp->oplock_type = NO_OPLOCK;
2637         }
2638
2639         set_share_mode(lck, fsp, get_current_uid(conn),
2640                         req ? req->mid : 0,
2641                        fsp->oplock_type);
2642
2643         /* Handle strange delete on close create semantics. */
2644         if (create_options & FILE_DELETE_ON_CLOSE) {
2645
2646                 status = can_set_delete_on_close(fsp, new_dos_attributes);
2647
2648                 if (!NT_STATUS_IS_OK(status)) {
2649                         /* Remember to delete the mode we just added. */
2650                         del_share_mode(lck, fsp);
2651                         TALLOC_FREE(lck);
2652                         fd_close(fsp);
2653                         return status;
2654                 }
2655                 /* Note that here we set the *inital* delete on close flag,
2656                    not the regular one. The magic gets handled in close. */
2657                 fsp->initial_delete_on_close = True;
2658         }
2659
2660         if (info != FILE_WAS_OPENED) {
2661                 /* Files should be initially set as archive */
2662                 if (lp_map_archive(SNUM(conn)) ||
2663                     lp_store_dos_attributes(SNUM(conn))) {
2664                         if (!posix_open) {
2665                                 if (file_set_dosmode(conn, smb_fname,
2666                                             new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
2667                                             parent_dir, true) == 0) {
2668                                         unx_mode = smb_fname->st.st_ex_mode;
2669                                 }
2670                         }
2671                 }
2672         }
2673
2674         /* Determine sparse flag. */
2675         if (posix_open) {
2676                 /* POSIX opens are sparse by default. */
2677                 fsp->is_sparse = true;
2678         } else {
2679                 fsp->is_sparse = (file_existed &&
2680                         (existing_dos_attributes & FILE_ATTRIBUTE_SPARSE));
2681         }
2682
2683         /*
2684          * Take care of inherited ACLs on created files - if default ACL not
2685          * selected.
2686          */
2687
2688         if (!posix_open && new_file_created && !def_acl) {
2689
2690                 int saved_errno = errno; /* We might get ENOSYS in the next
2691                                           * call.. */
2692
2693                 if (SMB_VFS_FCHMOD_ACL(fsp, unx_mode) == -1 &&
2694                     errno == ENOSYS) {
2695                         errno = saved_errno; /* Ignore ENOSYS */
2696                 }
2697
2698         } else if (new_unx_mode) {
2699
2700                 int ret = -1;
2701
2702                 /* Attributes need changing. File already existed. */
2703
2704                 {
2705                         int saved_errno = errno; /* We might get ENOSYS in the
2706                                                   * next call.. */
2707                         ret = SMB_VFS_FCHMOD_ACL(fsp, new_unx_mode);
2708
2709                         if (ret == -1 && errno == ENOSYS) {
2710                                 errno = saved_errno; /* Ignore ENOSYS */
2711                         } else {
2712                                 DEBUG(5, ("open_file_ntcreate: reset "
2713                                           "attributes of file %s to 0%o\n",
2714                                           smb_fname_str_dbg(smb_fname),
2715                                           (unsigned int)new_unx_mode));
2716                                 ret = 0; /* Don't do the fchmod below. */
2717                         }
2718                 }
2719
2720                 if ((ret == -1) &&
2721                     (SMB_VFS_FCHMOD(fsp, new_unx_mode) == -1))
2722                         DEBUG(5, ("open_file_ntcreate: failed to reset "
2723                                   "attributes of file %s to 0%o\n",
2724                                   smb_fname_str_dbg(smb_fname),
2725                                   (unsigned int)new_unx_mode));
2726         }
2727
2728         /* If this is a successful open, we must remove any deferred open
2729          * records. */
2730         if (req != NULL) {
2731                 del_deferred_open_entry(lck, req->mid,
2732                                         messaging_server_id(req->sconn->msg_ctx));
2733         }
2734         TALLOC_FREE(lck);
2735
2736         return NT_STATUS_OK;
2737 }
2738
2739
2740 /****************************************************************************
2741  Open a file for for write to ensure that we can fchmod it.
2742 ****************************************************************************/
2743
2744 NTSTATUS open_file_fchmod(connection_struct *conn,
2745                           struct smb_filename *smb_fname,
2746                           files_struct **result)
2747 {
2748         if (!VALID_STAT(smb_fname->st)) {
2749                 return NT_STATUS_INVALID_PARAMETER;
2750         }
2751
2752         return SMB_VFS_CREATE_FILE(
2753                 conn,                                   /* conn */
2754                 NULL,                                   /* req */
2755                 0,                                      /* root_dir_fid */
2756                 smb_fname,                              /* fname */
2757                 FILE_WRITE_DATA,                        /* access_mask */
2758                 (FILE_SHARE_READ | FILE_SHARE_WRITE |   /* share_access */
2759                     FILE_SHARE_DELETE),
2760                 FILE_OPEN,                              /* create_disposition*/
2761                 0,                                      /* create_options */
2762                 0,                                      /* file_attributes */
2763                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
2764                 0,                                      /* allocation_size */
2765                 0,                                      /* private_flags */
2766                 NULL,                                   /* sd */
2767                 NULL,                                   /* ea_list */
2768                 result,                                 /* result */
2769                 NULL);                                  /* pinfo */
2770 }
2771
2772 static NTSTATUS mkdir_internal(connection_struct *conn,
2773                                struct smb_filename *smb_dname,
2774                                uint32 file_attributes)
2775 {
2776         mode_t mode;
2777         char *parent_dir = NULL;
2778         NTSTATUS status;
2779         bool posix_open = false;
2780         bool need_re_stat = false;
2781         uint32_t access_mask = SEC_DIR_ADD_SUBDIR;
2782
2783         if(access_mask & ~(conn->share_access)) {
2784                 DEBUG(5,("mkdir_internal: failing share access "
2785                          "%s\n", lp_servicename(talloc_tos(), SNUM(conn))));
2786                 return NT_STATUS_ACCESS_DENIED;
2787         }
2788
2789         if (!parent_dirname(talloc_tos(), smb_dname->base_name, &parent_dir,
2790                             NULL)) {
2791                 return NT_STATUS_NO_MEMORY;
2792         }
2793
2794         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
2795                 posix_open = true;
2796                 mode = (mode_t)(file_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
2797         } else {
2798                 mode = unix_mode(conn, FILE_ATTRIBUTE_DIRECTORY, smb_dname, parent_dir);
2799         }
2800
2801         status = check_parent_access(conn,
2802                                         smb_dname,
2803                                         access_mask);
2804         if(!NT_STATUS_IS_OK(status)) {
2805                 DEBUG(5,("mkdir_internal: check_parent_access "
2806                         "on directory %s for path %s returned %s\n",
2807                         parent_dir,
2808                         smb_dname->base_name,
2809                         nt_errstr(status) ));
2810                 return status;
2811         }
2812
2813         if (SMB_VFS_MKDIR(conn, smb_dname->base_name, mode) != 0) {
2814                 return map_nt_error_from_unix(errno);
2815         }
2816
2817         /* Ensure we're checking for a symlink here.... */
2818         /* We don't want to get caught by a symlink racer. */
2819
2820         if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
2821                 DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
2822                           smb_fname_str_dbg(smb_dname), strerror(errno)));
2823                 return map_nt_error_from_unix(errno);
2824         }
2825
2826         if (!S_ISDIR(smb_dname->st.st_ex_mode)) {
2827                 DEBUG(0, ("Directory '%s' just created is not a directory !\n",
2828                           smb_fname_str_dbg(smb_dname)));
2829                 return NT_STATUS_NOT_A_DIRECTORY;
2830         }
2831
2832         if (lp_store_dos_attributes(SNUM(conn))) {
2833                 if (!posix_open) {
2834                         file_set_dosmode(conn, smb_dname,
2835                                          file_attributes | FILE_ATTRIBUTE_DIRECTORY,
2836                                          parent_dir, true);
2837                 }
2838         }
2839
2840         if (lp_inherit_perms(SNUM(conn))) {
2841                 inherit_access_posix_acl(conn, parent_dir,
2842                                          smb_dname->base_name, mode);
2843                 need_re_stat = true;
2844         }
2845
2846         if (!posix_open) {
2847                 /*
2848                  * Check if high bits should have been set,
2849                  * then (if bits are missing): add them.
2850                  * Consider bits automagically set by UNIX, i.e. SGID bit from parent
2851                  * dir.
2852                  */
2853                 if ((mode & ~(S_IRWXU|S_IRWXG|S_IRWXO)) &&
2854                     (mode & ~smb_dname->st.st_ex_mode)) {
2855                         SMB_VFS_CHMOD(conn, smb_dname->base_name,
2856                                       (smb_dname->st.st_ex_mode |
2857                                           (mode & ~smb_dname->st.st_ex_mode)));
2858                         need_re_stat = true;
2859                 }
2860         }
2861
2862         /* Change the owner if required. */
2863         if (lp_inherit_owner(SNUM(conn))) {
2864                 change_dir_owner_to_parent(conn, parent_dir,
2865                                            smb_dname->base_name,
2866                                            &smb_dname->st);
2867                 need_re_stat = true;
2868         }
2869
2870         if (need_re_stat) {
2871                 if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
2872                         DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
2873                           smb_fname_str_dbg(smb_dname), strerror(errno)));
2874                         return map_nt_error_from_unix(errno);
2875                 }
2876         }
2877
2878         notify_fname(conn, NOTIFY_ACTION_ADDED, FILE_NOTIFY_CHANGE_DIR_NAME,
2879                      smb_dname->base_name);
2880
2881         return NT_STATUS_OK;
2882 }
2883
2884 /****************************************************************************
2885  Open a directory from an NT SMB call.
2886 ****************************************************************************/
2887
2888 static NTSTATUS open_directory(connection_struct *conn,
2889                                struct smb_request *req,
2890                                struct smb_filename *smb_dname,
2891                                uint32 access_mask,
2892                                uint32 share_access,
2893                                uint32 create_disposition,
2894                                uint32 create_options,
2895                                uint32 file_attributes,
2896                                int *pinfo,
2897                                files_struct **result)
2898 {
2899         files_struct *fsp = NULL;
2900         bool dir_existed = VALID_STAT(smb_dname->st) ? True : False;
2901         struct share_mode_lock *lck = NULL;
2902         NTSTATUS status;
2903         struct timespec mtimespec;
2904         int info = 0;
2905
2906         if (is_ntfs_stream_smb_fname(smb_dname)) {
2907                 DEBUG(2, ("open_directory: %s is a stream name!\n",
2908                           smb_fname_str_dbg(smb_dname)));
2909                 return NT_STATUS_NOT_A_DIRECTORY;
2910         }
2911
2912         if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS)) {
2913                 /* Ensure we have a directory attribute. */
2914                 file_attributes |= FILE_ATTRIBUTE_DIRECTORY;
2915         }
2916
2917         DEBUG(5,("open_directory: opening directory %s, access_mask = 0x%x, "
2918                  "share_access = 0x%x create_options = 0x%x, "
2919                  "create_disposition = 0x%x, file_attributes = 0x%x\n",
2920                  smb_fname_str_dbg(smb_dname),
2921                  (unsigned int)access_mask,
2922                  (unsigned int)share_access,
2923                  (unsigned int)create_options,
2924                  (unsigned int)create_disposition,
2925                  (unsigned int)file_attributes));
2926
2927         status = smbd_calculate_access_mask(conn, smb_dname,
2928                                             access_mask, &access_mask);
2929         if (!NT_STATUS_IS_OK(status)) {
2930                 DEBUG(10, ("open_directory: smbd_calculate_access_mask "
2931                         "on file %s returned %s\n",
2932                         smb_fname_str_dbg(smb_dname),
2933                         nt_errstr(status)));
2934                 return status;
2935         }
2936
2937         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
2938                         !security_token_has_privilege(get_current_nttok(conn),
2939                                         SEC_PRIV_SECURITY)) {
2940                 DEBUG(10, ("open_directory: open on %s "
2941                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
2942                         smb_fname_str_dbg(smb_dname)));
2943                 return NT_STATUS_PRIVILEGE_NOT_HELD;
2944         }
2945
2946         switch( create_disposition ) {
2947                 case FILE_OPEN:
2948
2949                         if (!dir_existed) {
2950                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2951                         }
2952
2953                         info = FILE_WAS_OPENED;
2954                         break;
2955
2956                 case FILE_CREATE:
2957
2958                         /* If directory exists error. If directory doesn't
2959                          * exist create. */
2960
2961                         if (dir_existed) {
2962                                 status = NT_STATUS_OBJECT_NAME_COLLISION;
2963                                 DEBUG(2, ("open_directory: unable to create "
2964                                           "%s. Error was %s\n",
2965                                           smb_fname_str_dbg(smb_dname),
2966                                           nt_errstr(status)));
2967                                 return status;
2968                         }
2969
2970                         status = mkdir_internal(conn, smb_dname,
2971                                                 file_attributes);
2972
2973                         if (!NT_STATUS_IS_OK(status)) {
2974                                 DEBUG(2, ("open_directory: unable to create "
2975                                           "%s. Error was %s\n",
2976                                           smb_fname_str_dbg(smb_dname),
2977                                           nt_errstr(status)));
2978                                 return status;
2979                         }
2980
2981                         info = FILE_WAS_CREATED;
2982                         break;
2983
2984                 case FILE_OPEN_IF:
2985                         /*
2986                          * If directory exists open. If directory doesn't
2987                          * exist create.
2988                          */
2989
2990                         if (dir_existed) {
2991                                 status = NT_STATUS_OK;
2992                                 info = FILE_WAS_OPENED;
2993                         } else {
2994                                 status = mkdir_internal(conn, smb_dname,
2995                                                 file_attributes);
2996
2997                                 if (NT_STATUS_IS_OK(status)) {
2998                                         info = FILE_WAS_CREATED;
2999                                 } else {
3000                                         /* Cope with create race. */