source3/modules/vfs_acl_tdb.c

   1 /*
   2  * Store Windows ACLs in xattrs, or a tdb if configured that way.
   3  *
   4  * Copyright (C) Volker Lendecke, 2008
   5  * Copyright (C) Jeremy Allison, 2008
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 /* NOTE: This is an experimental module, not yet finished. JRA. */
  22
  23 #include "includes.h"
  24 #include "librpc/gen_ndr/xattr.h"
  25 #include "librpc/gen_ndr/ndr_xattr.h"
  26
  27 #undef DBGC_CLASS
  28 #define DBGC_CLASS DBGC_VFS
  29
  30 static unsigned int ref_count;
  31 static struct db_context *acl_db;
  32
  33 /*******************************************************************
  34  Open acl_db if not already open, increment ref count.
  35 *******************************************************************/
  36
  37 static bool acl_tdb_init(struct db_context **pp_db)
  38 {
  39         const char *dbname;
  40
  41         if (acl_db) {
  42                 *pp_db = acl_db;
  43                 ref_count++;
  44                 return true;
  45         }
  46
  47         dbname = lock_path("file_ntacls.tdb");
  48
  49         if (dbname == NULL) {
  50                 errno = ENOSYS;
  51                 return false;
  52         }
  53
  54         become_root();
  55         *pp_db = db_open(NULL, dbname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
  56         unbecome_root();
  57
  58         if (*pp_db == NULL) {
  59 #if defined(ENOTSUP)
  60                 errno = ENOTSUP;
  61 #else
  62                 errno = ENOSYS;
  63 #endif
  64                 return false;
  65         }
  66
  67         ref_count++;
  68         return true;
  69 }
  70
  71 /*******************************************************************
  72  Lower ref count and close acl_db if zero.
  73 *******************************************************************/
  74
  75 static void free_acl_xattr_data(void **pptr)
  76 {
  77         struct db_context **pp_db = (struct db_context **)pptr;
  78
  79         ref_count--;
  80         if (ref_count == 0) {
  81                 TALLOC_FREE(*pp_db);
  82                 acl_db = NULL;
  83         }
  84 }
  85
  86 /*******************************************************************
  87  Fetch_lock the tdb acl record for a file
  88 *******************************************************************/
  89
  90 static struct db_record *acl_xattr_tdb_lock(TALLOC_CTX *mem_ctx,
  91                                         struct db_context *db,
  92                                         const struct file_id *id)
  93 {
  94         uint8 id_buf[16];
  95         push_file_id_16((char *)id_buf, id);
  96         return db->fetch_locked(db,
  97                                 mem_ctx,
  98                                 make_tdb_data(id_buf,
  99                                         sizeof(id_buf)));
 100 }
 101
 102 /*******************************************************************
 103  Parse out a struct security_descriptor from a DATA_BLOB.
 104 *******************************************************************/
 105
 106 static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
 107                                 uint32 security_info,
 108                                 struct security_descriptor **ppdesc)
 109 {
 110         TALLOC_CTX *ctx = talloc_tos();
 111         struct xattr_NTACL xacl;
 112         enum ndr_err_code ndr_err;
 113         size_t sd_size;
 114
 115         ndr_err = ndr_pull_struct_blob(pblob, ctx, NULL, &xacl,
 116                         (ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
 117
 118         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 119                 DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
 120                         ndr_errstr(ndr_err)));
 121                 return ndr_map_error2ntstatus(ndr_err);;
 122         }
 123
 124         if (xacl.version != 2) {
 125                 return NT_STATUS_REVISION_MISMATCH;
 126         }
 127
 128         *ppdesc = make_sec_desc(ctx, SEC_DESC_REVISION, xacl.info.sd_ts->sd->type | SEC_DESC_SELF_RELATIVE,
 129                         (security_info & OWNER_SECURITY_INFORMATION)
 130                         ? xacl.info.sd_ts->sd->owner_sid : NULL,
 131                         (security_info & GROUP_SECURITY_INFORMATION)
 132                         ? xacl.info.sd_ts->sd->group_sid : NULL,
 133                         (security_info & SACL_SECURITY_INFORMATION)
 134                         ? xacl.info.sd_ts->sd->sacl : NULL,
 135                         (security_info & DACL_SECURITY_INFORMATION)
 136                         ? xacl.info.sd_ts->sd->dacl : NULL,
 137                         &sd_size);
 138
 139         TALLOC_FREE(xacl.info.sd);
 140
 141         return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
 142 }
 143
 144 /*******************************************************************
 145  Pull a security descriptor into a DATA_BLOB from a tdb store.
 146 *******************************************************************/
 147
 148 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
 149                         vfs_handle_struct *handle,
 150                         files_struct *fsp,
 151                         const char *name,
 152                         DATA_BLOB *pblob)
 153 {
 154         uint8 id_buf[16];
 155         TDB_DATA data;
 156         struct file_id id;
 157         struct db_context *db;
 158         SMB_STRUCT_STAT sbuf;
 159
 160         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
 161                 return NT_STATUS_INTERNAL_DB_CORRUPTION);
 162
 163         if (fsp && fsp->fh->fd != -1) {
 164                 if (SMB_VFS_FSTAT(fsp, &sbuf) == -1) {
 165                         return map_nt_error_from_unix(errno);
 166                 }
 167         } else {
 168                 if (SMB_VFS_STAT(handle->conn, name, &sbuf) == -1) {
 169                         return map_nt_error_from_unix(errno);
 170                 }
 171         }
 172         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
 173
 174         push_file_id_16((char *)id_buf, &id);
 175
 176         if (db->fetch(db,
 177                         ctx,
 178                         make_tdb_data(id_buf, sizeof(id_buf)),
 179                         &data) == -1) {
 180                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 181         }
 182
 183         pblob->data = data.dptr;
 184         pblob->length = data.dsize;
 185
 186         DEBUG(10,("get_acl_blob: returned %u bytes from file %s\n",
 187                 (unsigned int)data.dsize, name ));
 188
 189         if (pblob->length == 0 || pblob->data == NULL) {
 190                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 191         }
 192         return NT_STATUS_OK;
 193 }
 194
 195 /*******************************************************************
 196  Create a DATA_BLOB from a security descriptor.
 197 *******************************************************************/
 198
 199 static NTSTATUS create_acl_blob(const struct security_descriptor *psd, DATA_BLOB *pblob)
 200 {
 201         struct xattr_NTACL xacl;
 202         struct security_descriptor_timestamp sd_ts;
 203         enum ndr_err_code ndr_err;
 204         TALLOC_CTX *ctx = talloc_tos();
 205         struct timespec curr = timespec_current();
 206
 207         ZERO_STRUCT(xacl);
 208         ZERO_STRUCT(sd_ts);
 209
 210         /* Horrid hack as setting an xattr changes the ctime
 211          * on Linux. This gives a race of 1 second during
 212          * which we would not see a POSIX ACL set.
 213          */
 214         curr.tv_sec += 1;
 215
 216         xacl.version = 2;
 217         xacl.info.sd_ts = &sd_ts;
 218         xacl.info.sd_ts->sd = CONST_DISCARD(struct security_descriptor *, psd);
 219         unix_timespec_to_nt_time(&xacl.info.sd_ts->last_changed, curr);
 220
 221         DEBUG(10, ("create_acl_blob: timestamp stored as %s\n",
 222                 timestring(ctx, curr.tv_sec) ));
 223
 224         ndr_err = ndr_push_struct_blob(
 225                         pblob, ctx, NULL, &xacl,
 226                         (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
 227
 228         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 229                 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
 230                         ndr_errstr(ndr_err)));
 231                 return ndr_map_error2ntstatus(ndr_err);;
 232         }
 233
 234         return NT_STATUS_OK;
 235 }
 236
 237 /*******************************************************************
 238  Store a DATA_BLOB into a tdb record given an fsp pointer.
 239 *******************************************************************/
 240
 241 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
 242                                 files_struct *fsp,
 243                                 DATA_BLOB *pblob)
 244 {
 245         uint8 id_buf[16];
 246         struct file_id id;
 247         SMB_STRUCT_STAT sbuf;
 248         TDB_DATA data;
 249         struct db_context *db;
 250         struct db_record *rec;
 251
 252         DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
 253                         (unsigned int)pblob->length, fsp->fsp_name));
 254
 255         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
 256                 return NT_STATUS_INTERNAL_DB_CORRUPTION);
 257
 258         if (fsp->fh->fd != -1) {
 259                 if (SMB_VFS_FSTAT(fsp, &sbuf) == -1) {
 260                         return map_nt_error_from_unix(errno);
 261                 }
 262         } else {
 263                 if (SMB_VFS_STAT(handle->conn, fsp->fsp_name, &sbuf) == -1) {
 264                         return map_nt_error_from_unix(errno);
 265                 }
 266         }
 267         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
 268
 269         push_file_id_16((char *)id_buf, &id);
 270         rec = db->fetch_locked(db, talloc_tos(),
 271                                 make_tdb_data(id_buf,
 272                                         sizeof(id_buf)));
 273         if (rec == NULL) {
 274                 DEBUG(0, ("store_acl_blob_fsp_tdb: fetch_lock failed\n"));
 275                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 276         }
 277         data.dptr = pblob->data;
 278         data.dsize = pblob->length;
 279         return rec->store(rec, data, 0);
 280 }
 281
 282 /*******************************************************************
 283  Store a DATA_BLOB into a tdb record given a pathname.
 284 *******************************************************************/
 285
 286 static NTSTATUS store_acl_blob_pathname(vfs_handle_struct *handle,
 287                                         const char *fname,
 288                                         DATA_BLOB *pblob)
 289 {
 290         uint8 id_buf[16];
 291         struct file_id id;
 292         TDB_DATA data;
 293         SMB_STRUCT_STAT sbuf;
 294         struct db_context *db;
 295         struct db_record *rec;
 296
 297         DEBUG(10,("store_acl_blob_pathname: storing blob "
 298                         "length %u on file %s\n",
 299                         (unsigned int)pblob->length, fname));
 300
 301         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
 302                 return NT_STATUS_INTERNAL_DB_CORRUPTION);
 303
 304         if (SMB_VFS_STAT(handle->conn, fname, &sbuf) == -1) {
 305                 return map_nt_error_from_unix(errno);
 306         }
 307
 308         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
 309         push_file_id_16((char *)id_buf, &id);
 310
 311         rec = db->fetch_locked(db, talloc_tos(),
 312                                 make_tdb_data(id_buf,
 313                                         sizeof(id_buf)));
 314         if (rec == NULL) {
 315                 DEBUG(0, ("store_acl_blob_pathname_tdb: fetch_lock failed\n"));
 316                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 317         }
 318         data.dptr = pblob->data;
 319         data.dsize = pblob->length;
 320         return rec->store(rec, data, 0);
 321 }
 322
 323 /*******************************************************************
 324  Store a DATA_BLOB into an xattr given a pathname.
 325 *******************************************************************/
 326
 327 static NTSTATUS get_nt_acl_xattr_internal(vfs_handle_struct *handle,
 328                                         files_struct *fsp,
 329                                         const char *name,
 330                                         uint32 security_info,
 331                                         struct security_descriptor **ppdesc)
 332 {
 333         TALLOC_CTX *ctx = talloc_tos();
 334         DATA_BLOB blob;
 335         NTSTATUS status;
 336
 337         if (fsp && name == NULL) {
 338                 name = fsp->fsp_name;
 339         }
 340
 341         DEBUG(10, ("get_nt_acl_xattr_internal: name=%s\n", name));
 342
 343         status = get_acl_blob(ctx, handle, fsp, name, &blob);
 344         if (!NT_STATUS_IS_OK(status)) {
 345                 DEBUG(10, ("get_acl_blob returned %s\n", nt_errstr(status)));
 346                 return status;
 347         }
 348
 349         status = parse_acl_blob(&blob, security_info, ppdesc);
 350         if (!NT_STATUS_IS_OK(status)) {
 351                 DEBUG(10, ("parse_acl_blob returned %s\n",
 352                                 nt_errstr(status)));
 353                 return status;
 354         }
 355
 356         TALLOC_FREE(blob.data);
 357         return status;
 358 }
 359
 360 /*********************************************************************
 361  Create a default security descriptor for a file in case no inheritance
 362  exists. All permissions to the owner and SYSTEM.
 363 *********************************************************************/
 364
 365 static struct security_descriptor *default_file_sd(TALLOC_CTX *mem_ctx,
 366                                                 SMB_STRUCT_STAT *psbuf)
 367 {
 368         struct dom_sid owner_sid, group_sid;
 369         size_t sd_size;
 370         struct security_ace *pace = NULL;
 371         struct security_acl *pacl = NULL;
 372
 373         uid_to_sid(&owner_sid, psbuf->st_uid);
 374         gid_to_sid(&group_sid, psbuf->st_gid);
 375
 376         pace = TALLOC_ARRAY(mem_ctx, struct security_ace, 2);
 377         if (!pace) {
 378                 return NULL;
 379         }
 380
 381         init_sec_ace(&pace[0], &owner_sid, SEC_ACE_TYPE_ACCESS_ALLOWED,
 382                         SEC_RIGHTS_FILE_ALL, 0);
 383         init_sec_ace(&pace[1], &global_sid_System, SEC_ACE_TYPE_ACCESS_ALLOWED,
 384                         SEC_RIGHTS_FILE_ALL, 0);
 385
 386         pacl = make_sec_acl(mem_ctx,
 387                                 NT4_ACL_REVISION,
 388                                 2,
 389                                 pace);
 390         if (!pacl) {
 391                 return NULL;
 392         }
 393         return make_sec_desc(mem_ctx,
 394                         SECURITY_DESCRIPTOR_REVISION_1,
 395                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
 396                         &owner_sid,
 397                         &group_sid,
 398                         NULL,
 399                         pacl,
 400                         &sd_size);
 401 }
 402
 403 /*********************************************************************
 404 *********************************************************************/
 405
 406 static NTSTATUS inherit_new_acl(vfs_handle_struct *handle,
 407                                         const char *fname,
 408                                         files_struct *fsp,
 409                                         bool container)
 410 {
 411         TALLOC_CTX *ctx = talloc_tos();
 412         NTSTATUS status;
 413         struct security_descriptor *parent_desc = NULL;
 414         struct security_descriptor *psd = NULL;
 415         DATA_BLOB blob;
 416         size_t size;
 417         char *parent_name;
 418
 419         if (!parent_dirname_talloc(ctx,
 420                                 fname,
 421                                 &parent_name,
 422                                 NULL)) {
 423                 return NT_STATUS_NO_MEMORY;
 424         }
 425
 426         DEBUG(10,("inherit_new_acl: check directory %s\n",
 427                         parent_name));
 428
 429         status = get_nt_acl_xattr_internal(handle,
 430                                         NULL,
 431                                         parent_name,
 432                                         (OWNER_SECURITY_INFORMATION |
 433                                          GROUP_SECURITY_INFORMATION |
 434                                          DACL_SECURITY_INFORMATION),
 435                                         &parent_desc);
 436         if (NT_STATUS_IS_OK(status)) {
 437                 /* Create an inherited descriptor from the parent. */
 438
 439                 if (DEBUGLEVEL >= 10) {
 440                         DEBUG(10,("inherit_new_acl: parent acl is:\n"));
 441                         NDR_PRINT_DEBUG(security_descriptor, parent_desc);
 442                 }
 443
 444                 status = se_create_child_secdesc(ctx,
 445                                 &psd,
 446                                 &size,
 447                                 parent_desc,
 448                                 &handle->conn->server_info->ptok->user_sids[PRIMARY_USER_SID_INDEX],
 449                                 &handle->conn->server_info->ptok->user_sids[PRIMARY_GROUP_SID_INDEX],
 450                                 container);
 451                 if (!NT_STATUS_IS_OK(status)) {
 452                         return status;
 453                 }
 454
 455                 if (DEBUGLEVEL >= 10) {
 456                         DEBUG(10,("inherit_new_acl: child acl is:\n"));
 457                         NDR_PRINT_DEBUG(security_descriptor, psd);
 458                 }
 459
 460         } else {
 461                 DEBUG(10,("inherit_new_acl: directory %s failed "
 462                         "to get acl %s\n",
 463                         parent_name,
 464                         nt_errstr(status) ));
 465         }
 466
 467         if (!psd || psd->dacl == NULL) {
 468                 SMB_STRUCT_STAT sbuf;
 469                 int ret;
 470
 471                 TALLOC_FREE(psd);
 472                 if (fsp && !fsp->is_directory && fsp->fh->fd != -1) {
 473                         ret = SMB_VFS_FSTAT(fsp, &sbuf);
 474                 } else {
 475                         ret = SMB_VFS_STAT(handle->conn,fname, &sbuf);
 476                 }
 477                 if (ret == -1) {
 478                         return map_nt_error_from_unix(errno);
 479                 }
 480                 psd = default_file_sd(ctx, &sbuf);
 481                 if (!psd) {
 482                         return NT_STATUS_NO_MEMORY;
 483                 }
 484
 485                 if (DEBUGLEVEL >= 10) {
 486                         DEBUG(10,("inherit_new_acl: default acl is:\n"));
 487                         NDR_PRINT_DEBUG(security_descriptor, psd);
 488                 }
 489         }
 490
 491         status = create_acl_blob(psd, &blob);
 492         if (!NT_STATUS_IS_OK(status)) {
 493                 return status;
 494         }
 495         if (fsp) {
 496                 return store_acl_blob_fsp(handle, fsp, &blob);
 497         } else {
 498                 return store_acl_blob_pathname(handle, fname, &blob);
 499         }
 500 }
 501
 502 /*********************************************************************
 503  Check ACL on open. For new files inherit from parent directory.
 504 *********************************************************************/
 505
 506 static int open_acl_xattr(vfs_handle_struct *handle,
 507                                         const char *fname,
 508                                         files_struct *fsp,
 509                                         int flags,
 510                                         mode_t mode)
 511 {
 512         uint32_t access_granted = 0;
 513         struct security_descriptor *pdesc = NULL;
 514         bool file_existed = true;
 515         NTSTATUS status = get_nt_acl_xattr_internal(handle,
 516                                         NULL,
 517                                         fname,
 518                                         (OWNER_SECURITY_INFORMATION |
 519                                          GROUP_SECURITY_INFORMATION |
 520                                          DACL_SECURITY_INFORMATION),
 521                                         &pdesc);
 522         if (NT_STATUS_IS_OK(status)) {
 523                 /* See if we can access it. */
 524                 status = smb1_file_se_access_check(pdesc,
 525                                         handle->conn->server_info->ptok,
 526                                         fsp->access_mask,
 527                                         &access_granted);
 528                 if (!NT_STATUS_IS_OK(status)) {
 529                         DEBUG(10,("open_acl_xattr: file %s open "
 530                                 "refused with error %s\n",
 531                                 fname,
 532                                 nt_errstr(status) ));
 533                         errno = map_errno_from_nt_status(status);
 534                         return -1;
 535                 }
 536         } else if (NT_STATUS_EQUAL(status,NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 537                 file_existed = false;
 538         }
 539
 540         DEBUG(10,("open_acl_xattr: get_nt_acl_attr_internal for "
 541                 "file %s returned %s\n",
 542                 fname,
 543                 nt_errstr(status) ));
 544
 545         fsp->fh->fd = SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);
 546
 547         if (!file_existed && fsp->fh->fd != -1) {
 548                 /* File was created. Inherit from parent directory. */
 549                 string_set(&fsp->fsp_name, fname);
 550                 inherit_new_acl(handle, fname, fsp, false);
 551         }
 552
 553         return fsp->fh->fd;
 554 }
 555
 556 /*********************************************************************
 557  On unlink we need to delete the tdb record (if using tdb).
 558 *********************************************************************/
 559
 560 static int unlink_acl_xattr(vfs_handle_struct *handle, const char *path)
 561 {
 562         SMB_STRUCT_STAT sbuf;
 563         struct file_id id;
 564         struct db_context *db;
 565         struct db_record *rec;
 566         int ret;
 567
 568         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
 569
 570         if (SMB_VFS_STAT(handle->conn, path, &sbuf) == -1) {
 571                 return -1;
 572         }
 573
 574         ret = SMB_VFS_NEXT_UNLINK(handle, path);
 575
 576         if (ret == -1) {
 577                 return -1;
 578         }
 579
 580         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
 581
 582         rec = acl_xattr_tdb_lock(talloc_tos(), db, &id);
 583
 584         /*
 585          * If rec == NULL there's not much we can do about it
 586          */
 587
 588         if (rec == NULL) {
 589                 DEBUG(10,("unlink_acl_xattr: path %s rec == NULL\n",
 590                         path ));
 591                 TALLOC_FREE(rec);
 592                 return 0;
 593         }
 594
 595         rec->delete_rec(rec);
 596         TALLOC_FREE(rec);
 597
 598         return 0;
 599 }
 600
 601 /*********************************************************************
 602  Store an inherited SD on mkdir.
 603 *********************************************************************/
 604
 605 static int mkdir_acl_xattr(vfs_handle_struct *handle, const char *path, mode_t mode)
 606 {
 607         int ret = SMB_VFS_NEXT_MKDIR(handle, path, mode);
 608
 609         if (ret == -1) {
 610                 return ret;
 611         }
 612         /* New directory - inherit from parent. */
 613         inherit_new_acl(handle, path, NULL, true);
 614         return ret;
 615 }
 616
 617 /*********************************************************************
 618  On rmdir we need to delete the tdb record (if using tdb).
 619 *********************************************************************/
 620
 621 static int rmdir_acl_xattr(vfs_handle_struct *handle, const char *path)
 622 {
 623         SMB_STRUCT_STAT sbuf;
 624         struct file_id id;
 625         struct db_context *db;
 626         struct db_record *rec;
 627         int ret;
 628
 629         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
 630
 631         if (SMB_VFS_STAT(handle->conn, path, &sbuf) == -1) {
 632                 return -1;
 633         }
 634
 635         ret = SMB_VFS_NEXT_RMDIR(handle, path);
 636
 637         if (ret == -1) {
 638                 return -1;
 639         }
 640
 641         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
 642
 643         rec = acl_xattr_tdb_lock(talloc_tos(), db, &id);
 644
 645         /*
 646          * If rec == NULL there's not much we can do about it
 647          */
 648
 649         if (rec == NULL) {
 650                 DEBUG(10,("rmdir_acl_xattr: path %s rec == NULL\n",
 651                         path ));
 652                 TALLOC_FREE(rec);
 653                 return 0;
 654         }
 655
 656         rec->delete_rec(rec);
 657         TALLOC_FREE(rec);
 658
 659         return 0;
 660 }
 661
 662 /*********************************************************************
 663  Fetch a security descriptor given an fsp.
 664 *********************************************************************/
 665
 666 static NTSTATUS fget_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
 667         uint32 security_info, struct security_descriptor **ppdesc)
 668 {
 669         NTSTATUS status = get_nt_acl_xattr_internal(handle, fsp,
 670                                 NULL, security_info, ppdesc);
 671         if (NT_STATUS_IS_OK(status)) {
 672                 if (DEBUGLEVEL >= 10) {
 673                         DEBUG(10,("fget_nt_acl_xattr: returning xattr sd for file %s\n",
 674                                 fsp->fsp_name));
 675                         NDR_PRINT_DEBUG(security_descriptor, *ppdesc);
 676                 }
 677                 return NT_STATUS_OK;
 678         }
 679
 680         DEBUG(10,("fget_nt_acl_xattr: failed to get xattr sd for file %s, Error %s\n",
 681                         fsp->fsp_name,
 682                         nt_errstr(status) ));
 683
 684         return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp,
 685                         security_info, ppdesc);
 686 }
 687
 688 /*********************************************************************
 689  Fetch a security descriptor given a pathname.
 690 *********************************************************************/
 691
 692 static NTSTATUS get_nt_acl_xattr(vfs_handle_struct *handle,
 693         const char *name, uint32 security_info, struct security_descriptor **ppdesc)
 694 {
 695         NTSTATUS status = get_nt_acl_xattr_internal(handle, NULL,
 696                                 name, security_info, ppdesc);
 697         if (NT_STATUS_IS_OK(status)) {
 698                 if (DEBUGLEVEL >= 10) {
 699                         DEBUG(10,("get_nt_acl_xattr: returning xattr sd for file %s\n",
 700                                 name));
 701                         NDR_PRINT_DEBUG(security_descriptor, *ppdesc);
 702                 }
 703                 return NT_STATUS_OK;
 704         }
 705
 706         DEBUG(10,("get_nt_acl_xattr: failed to get xattr sd for file %s, Error %s\n",
 707                         name,
 708                         nt_errstr(status) ));
 709
 710         return SMB_VFS_NEXT_GET_NT_ACL(handle, name,
 711                         security_info, ppdesc);
 712 }
 713
 714 /*********************************************************************
 715  Store a security descriptor given an fsp.
 716 *********************************************************************/
 717
 718 static NTSTATUS fset_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
 719         uint32 security_info_sent, const struct security_descriptor *psd)
 720 {
 721         NTSTATUS status;
 722         DATA_BLOB blob;
 723
 724         if (DEBUGLEVEL >= 10) {
 725                 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
 726                         fsp->fsp_name));
 727                 NDR_PRINT_DEBUG(security_descriptor,
 728                         CONST_DISCARD(struct security_descriptor *,psd));
 729         }
 730
 731         status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 732         if (!NT_STATUS_IS_OK(status)) {
 733                 return status;
 734         }
 735
 736         /* Ensure owner and group are set. */
 737         if (!psd->owner_sid || !psd->group_sid) {
 738                 int ret;
 739                 SMB_STRUCT_STAT sbuf;
 740                 DOM_SID owner_sid, group_sid;
 741                 struct security_descriptor *nc_psd = dup_sec_desc(talloc_tos(), psd);
 742
 743                 if (!nc_psd) {
 744                         return NT_STATUS_OK;
 745                 }
 746                 if (fsp->is_directory || fsp->fh->fd == -1) {
 747                         ret = SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf);
 748                 } else {
 749                         ret = SMB_VFS_FSTAT(fsp, &sbuf);
 750                 }
 751                 if (ret == -1) {
 752                         /* Lower level acl set succeeded,
 753                          * so still return OK. */
 754                         return NT_STATUS_OK;
 755                 }
 756                 create_file_sids(&sbuf, &owner_sid, &group_sid);
 757                 /* This is safe as nc_psd is discarded at fn exit. */
 758                 nc_psd->owner_sid = &owner_sid;
 759                 nc_psd->group_sid = &group_sid;
 760                 security_info_sent |= (OWNER_SECURITY_INFORMATION|GROUP_SECURITY_INFORMATION);
 761                 psd = nc_psd;
 762         }
 763
 764         if ((security_info_sent & DACL_SECURITY_INFORMATION) &&
 765                         psd->dacl != NULL &&
 766                         (psd->type & (SE_DESC_DACL_AUTO_INHERITED|
 767                                 SE_DESC_DACL_AUTO_INHERIT_REQ))==
 768                                 (SE_DESC_DACL_AUTO_INHERITED|
 769                                 SE_DESC_DACL_AUTO_INHERIT_REQ) ) {
 770                 struct security_descriptor *new_psd = NULL;
 771                 status = append_parent_acl(fsp, psd, &new_psd);
 772                 if (!NT_STATUS_IS_OK(status)) {
 773                         /* Lower level acl set succeeded,
 774                          * so still return OK. */
 775                         return NT_STATUS_OK;
 776                 }
 777                 psd = new_psd;
 778         }
 779
 780         if (DEBUGLEVEL >= 10) {
 781                 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
 782                         fsp->fsp_name));
 783                 NDR_PRINT_DEBUG(security_descriptor,
 784                         CONST_DISCARD(struct security_descriptor *,psd));
 785         }
 786         create_acl_blob(psd, &blob);
 787         store_acl_blob_fsp(handle, fsp, &blob);
 788
 789         return NT_STATUS_OK;
 790 }
 791
 792 /*******************************************************************
 793  Handle opening the storage tdb if so configured.
 794 *******************************************************************/
 795
 796 static int connect_acl_xattr(struct vfs_handle_struct *handle,
 797                                 const char *service,
 798                                 const char *user)
 799 {
 800         struct db_context *db;
 801         int res;
 802
 803         res = SMB_VFS_NEXT_CONNECT(handle, service, user);
 804         if (res < 0) {
 805                 return res;
 806         }
 807
 808         if (!acl_tdb_init(&db)) {
 809                 SMB_VFS_NEXT_DISCONNECT(handle);
 810                 return -1;
 811         }
 812
 813         SMB_VFS_HANDLE_SET_DATA(handle, db, free_acl_xattr_data,
 814                                 struct db_context, return -1);
 815
 816         return 0;
 817 }
 818
 819 /* VFS operations structure */
 820
 821 static vfs_op_tuple skel_op_tuples[] =
 822 {
 823         {SMB_VFS_OP(connect_acl_xattr), SMB_VFS_OP_CONNECT,  SMB_VFS_LAYER_TRANSPARENT},
 824
 825         {SMB_VFS_OP(mkdir_acl_xattr), SMB_VFS_OP_MKDIR, SMB_VFS_LAYER_TRANSPARENT},
 826         {SMB_VFS_OP(rmdir_acl_xattr), SMB_VFS_OP_RMDIR, SMB_VFS_LAYER_TRANSPARENT},
 827
 828         {SMB_VFS_OP(open_acl_xattr),  SMB_VFS_OP_OPEN,  SMB_VFS_LAYER_TRANSPARENT},
 829         {SMB_VFS_OP(unlink_acl_xattr), SMB_VFS_OP_UNLINK, SMB_VFS_LAYER_TRANSPARENT},
 830
 831         /* NT File ACL operations */
 832
 833         {SMB_VFS_OP(fget_nt_acl_xattr),SMB_VFS_OP_FGET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
 834         {SMB_VFS_OP(get_nt_acl_xattr), SMB_VFS_OP_GET_NT_ACL, SMB_VFS_LAYER_TRANSPARENT},
 835         {SMB_VFS_OP(fset_nt_acl_xattr),SMB_VFS_OP_FSET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
 836
 837         {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
 838 };
 839
 840 NTSTATUS vfs_acl_xattr_init(void)
 841 {
 842         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_tdb", skel_op_tuples);
 843 }