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_hs->sd->type | SEC_DESC_SELF_RELATIVE,
 129                         (security_info & OWNER_SECURITY_INFORMATION)
 130                         ? xacl.info.sd_hs->sd->owner_sid : NULL,
 131                         (security_info & GROUP_SECURITY_INFORMATION)
 132                         ? xacl.info.sd_hs->sd->group_sid : NULL,
 133                         (security_info & SACL_SECURITY_INFORMATION)
 134                         ? xacl.info.sd_hs->sd->sacl : NULL,
 135                         (security_info & DACL_SECURITY_INFORMATION)
 136                         ? xacl.info.sd_hs->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_hash sd_hs;
 203         enum ndr_err_code ndr_err;
 204         TALLOC_CTX *ctx = talloc_tos();
 205
 206         ZERO_STRUCT(xacl);
 207         ZERO_STRUCT(sd_hs);
 208
 209         xacl.version = 2;
 210         xacl.info.sd_hs = &sd_hs;
 211         xacl.info.sd_hs->sd = CONST_DISCARD(struct security_descriptor *, psd);
 212         memset(&xacl.info.sd_hs->hash[0], '\0', 16);
 213
 214         ndr_err = ndr_push_struct_blob(
 215                         pblob, ctx, NULL, &xacl,
 216                         (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
 217
 218         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 219                 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
 220                         ndr_errstr(ndr_err)));
 221                 return ndr_map_error2ntstatus(ndr_err);;
 222         }
 223
 224         return NT_STATUS_OK;
 225 }
 226
 227 /*******************************************************************
 228  Store a DATA_BLOB into a tdb record given an fsp pointer.
 229 *******************************************************************/
 230
 231 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
 232                                 files_struct *fsp,
 233                                 DATA_BLOB *pblob)
 234 {
 235         uint8 id_buf[16];
 236         struct file_id id;
 237         SMB_STRUCT_STAT sbuf;
 238         TDB_DATA data;
 239         struct db_context *db;
 240         struct db_record *rec;
 241
 242         DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
 243                         (unsigned int)pblob->length, fsp->fsp_name));
 244
 245         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
 246                 return NT_STATUS_INTERNAL_DB_CORRUPTION);
 247
 248         if (fsp->fh->fd != -1) {
 249                 if (SMB_VFS_FSTAT(fsp, &sbuf) == -1) {
 250                         return map_nt_error_from_unix(errno);
 251                 }
 252         } else {
 253                 if (SMB_VFS_STAT(handle->conn, fsp->fsp_name, &sbuf) == -1) {
 254                         return map_nt_error_from_unix(errno);
 255                 }
 256         }
 257         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
 258
 259         push_file_id_16((char *)id_buf, &id);
 260         rec = db->fetch_locked(db, talloc_tos(),
 261                                 make_tdb_data(id_buf,
 262                                         sizeof(id_buf)));
 263         if (rec == NULL) {
 264                 DEBUG(0, ("store_acl_blob_fsp_tdb: fetch_lock failed\n"));
 265                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 266         }
 267         data.dptr = pblob->data;
 268         data.dsize = pblob->length;
 269         return rec->store(rec, data, 0);
 270 }
 271
 272 /*******************************************************************
 273  Store a DATA_BLOB into a tdb record given a pathname.
 274 *******************************************************************/
 275
 276 static NTSTATUS store_acl_blob_pathname(vfs_handle_struct *handle,
 277                                         const char *fname,
 278                                         DATA_BLOB *pblob)
 279 {
 280         uint8 id_buf[16];
 281         struct file_id id;
 282         TDB_DATA data;
 283         SMB_STRUCT_STAT sbuf;
 284         struct db_context *db;
 285         struct db_record *rec;
 286
 287         DEBUG(10,("store_acl_blob_pathname: storing blob "
 288                         "length %u on file %s\n",
 289                         (unsigned int)pblob->length, fname));
 290
 291         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
 292                 return NT_STATUS_INTERNAL_DB_CORRUPTION);
 293
 294         if (SMB_VFS_STAT(handle->conn, fname, &sbuf) == -1) {
 295                 return map_nt_error_from_unix(errno);
 296         }
 297
 298         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
 299         push_file_id_16((char *)id_buf, &id);
 300
 301         rec = db->fetch_locked(db, talloc_tos(),
 302                                 make_tdb_data(id_buf,
 303                                         sizeof(id_buf)));
 304         if (rec == NULL) {
 305                 DEBUG(0, ("store_acl_blob_pathname_tdb: fetch_lock failed\n"));
 306                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 307         }
 308         data.dptr = pblob->data;
 309         data.dsize = pblob->length;
 310         return rec->store(rec, data, 0);
 311 }
 312
 313 /*******************************************************************
 314  Store a DATA_BLOB into an xattr given a pathname.
 315 *******************************************************************/
 316
 317 static NTSTATUS get_nt_acl_xattr_internal(vfs_handle_struct *handle,
 318                                         files_struct *fsp,
 319                                         const char *name,
 320                                         uint32 security_info,
 321                                         struct security_descriptor **ppdesc)
 322 {
 323         TALLOC_CTX *ctx = talloc_tos();
 324         DATA_BLOB blob;
 325         NTSTATUS status;
 326
 327         if (fsp && name == NULL) {
 328                 name = fsp->fsp_name;
 329         }
 330
 331         DEBUG(10, ("get_nt_acl_xattr_internal: name=%s\n", name));
 332
 333         status = get_acl_blob(ctx, handle, fsp, name, &blob);
 334         if (!NT_STATUS_IS_OK(status)) {
 335                 DEBUG(10, ("get_acl_blob returned %s\n", nt_errstr(status)));
 336                 return status;
 337         }
 338
 339         status = parse_acl_blob(&blob, security_info, ppdesc);
 340         if (!NT_STATUS_IS_OK(status)) {
 341                 DEBUG(10, ("parse_acl_blob returned %s\n",
 342                                 nt_errstr(status)));
 343                 return status;
 344         }
 345
 346         TALLOC_FREE(blob.data);
 347         return status;
 348 }
 349
 350 /*********************************************************************
 351  Create a default security descriptor for a file in case no inheritance
 352  exists. All permissions to the owner and SYSTEM.
 353 *********************************************************************/
 354
 355 static struct security_descriptor *default_file_sd(TALLOC_CTX *mem_ctx,
 356                                                 SMB_STRUCT_STAT *psbuf)
 357 {
 358         struct dom_sid owner_sid, group_sid;
 359         size_t sd_size;
 360         struct security_ace *pace = NULL;
 361         struct security_acl *pacl = NULL;
 362
 363         uid_to_sid(&owner_sid, psbuf->st_uid);
 364         gid_to_sid(&group_sid, psbuf->st_gid);
 365
 366         pace = TALLOC_ARRAY(mem_ctx, struct security_ace, 2);
 367         if (!pace) {
 368                 return NULL;
 369         }
 370
 371         init_sec_ace(&pace[0], &owner_sid, SEC_ACE_TYPE_ACCESS_ALLOWED,
 372                         SEC_RIGHTS_FILE_ALL, 0);
 373         init_sec_ace(&pace[1], &global_sid_System, SEC_ACE_TYPE_ACCESS_ALLOWED,
 374                         SEC_RIGHTS_FILE_ALL, 0);
 375
 376         pacl = make_sec_acl(mem_ctx,
 377                                 NT4_ACL_REVISION,
 378                                 2,
 379                                 pace);
 380         if (!pacl) {
 381                 return NULL;
 382         }
 383         return make_sec_desc(mem_ctx,
 384                         SECURITY_DESCRIPTOR_REVISION_1,
 385                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
 386                         &owner_sid,
 387                         &group_sid,
 388                         NULL,
 389                         pacl,
 390                         &sd_size);
 391 }
 392
 393 /*********************************************************************
 394 *********************************************************************/
 395
 396 static NTSTATUS inherit_new_acl(vfs_handle_struct *handle,
 397                                         const char *fname,
 398                                         files_struct *fsp,
 399                                         bool container)
 400 {
 401         TALLOC_CTX *ctx = talloc_tos();
 402         NTSTATUS status;
 403         struct security_descriptor *parent_desc = NULL;
 404         struct security_descriptor *psd = NULL;
 405         DATA_BLOB blob;
 406         size_t size;
 407         char *parent_name;
 408
 409         if (!parent_dirname_talloc(ctx,
 410                                 fname,
 411                                 &parent_name,
 412                                 NULL)) {
 413                 return NT_STATUS_NO_MEMORY;
 414         }
 415
 416         DEBUG(10,("inherit_new_acl: check directory %s\n",
 417                         parent_name));
 418
 419         status = get_nt_acl_xattr_internal(handle,
 420                                         NULL,
 421                                         parent_name,
 422                                         (OWNER_SECURITY_INFORMATION |
 423                                          GROUP_SECURITY_INFORMATION |
 424                                          DACL_SECURITY_INFORMATION),
 425                                         &parent_desc);
 426         if (NT_STATUS_IS_OK(status)) {
 427                 /* Create an inherited descriptor from the parent. */
 428
 429                 if (DEBUGLEVEL >= 10) {
 430                         DEBUG(10,("inherit_new_acl: parent acl is:\n"));
 431                         NDR_PRINT_DEBUG(security_descriptor, parent_desc);
 432                 }
 433
 434                 status = se_create_child_secdesc(ctx,
 435                                 &psd,
 436                                 &size,
 437                                 parent_desc,
 438                                 &handle->conn->server_info->ptok->user_sids[PRIMARY_USER_SID_INDEX],
 439                                 &handle->conn->server_info->ptok->user_sids[PRIMARY_GROUP_SID_INDEX],
 440                                 container);
 441                 if (!NT_STATUS_IS_OK(status)) {
 442                         return status;
 443                 }
 444
 445                 if (DEBUGLEVEL >= 10) {
 446                         DEBUG(10,("inherit_new_acl: child acl is:\n"));
 447                         NDR_PRINT_DEBUG(security_descriptor, psd);
 448                 }
 449
 450         } else {
 451                 DEBUG(10,("inherit_new_acl: directory %s failed "
 452                         "to get acl %s\n",
 453                         parent_name,
 454                         nt_errstr(status) ));
 455         }
 456
 457         if (!psd || psd->dacl == NULL) {
 458                 SMB_STRUCT_STAT sbuf;
 459                 int ret;
 460
 461                 TALLOC_FREE(psd);
 462                 if (fsp && !fsp->is_directory && fsp->fh->fd != -1) {
 463                         ret = SMB_VFS_FSTAT(fsp, &sbuf);
 464                 } else {
 465                         ret = SMB_VFS_STAT(handle->conn,fname, &sbuf);
 466                 }
 467                 if (ret == -1) {
 468                         return map_nt_error_from_unix(errno);
 469                 }
 470                 psd = default_file_sd(ctx, &sbuf);
 471                 if (!psd) {
 472                         return NT_STATUS_NO_MEMORY;
 473                 }
 474
 475                 if (DEBUGLEVEL >= 10) {
 476                         DEBUG(10,("inherit_new_acl: default acl is:\n"));
 477                         NDR_PRINT_DEBUG(security_descriptor, psd);
 478                 }
 479         }
 480
 481         status = create_acl_blob(psd, &blob);
 482         if (!NT_STATUS_IS_OK(status)) {
 483                 return status;
 484         }
 485         if (fsp) {
 486                 return store_acl_blob_fsp(handle, fsp, &blob);
 487         } else {
 488                 return store_acl_blob_pathname(handle, fname, &blob);
 489         }
 490 }
 491
 492 /*********************************************************************
 493  Check ACL on open. For new files inherit from parent directory.
 494 *********************************************************************/
 495
 496 static int open_acl_xattr(vfs_handle_struct *handle,
 497                                         const char *fname,
 498                                         files_struct *fsp,
 499                                         int flags,
 500                                         mode_t mode)
 501 {
 502         uint32_t access_granted = 0;
 503         struct security_descriptor *pdesc = NULL;
 504         bool file_existed = true;
 505         NTSTATUS status = get_nt_acl_xattr_internal(handle,
 506                                         NULL,
 507                                         fname,
 508                                         (OWNER_SECURITY_INFORMATION |
 509                                          GROUP_SECURITY_INFORMATION |
 510                                          DACL_SECURITY_INFORMATION),
 511                                         &pdesc);
 512         if (NT_STATUS_IS_OK(status)) {
 513                 /* See if we can access it. */
 514                 status = smb1_file_se_access_check(pdesc,
 515                                         handle->conn->server_info->ptok,
 516                                         fsp->access_mask,
 517                                         &access_granted);
 518                 if (!NT_STATUS_IS_OK(status)) {
 519                         DEBUG(10,("open_acl_xattr: file %s open "
 520                                 "refused with error %s\n",
 521                                 fname,
 522                                 nt_errstr(status) ));
 523                         errno = map_errno_from_nt_status(status);
 524                         return -1;
 525                 }
 526         } else if (NT_STATUS_EQUAL(status,NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 527                 file_existed = false;
 528         }
 529
 530         DEBUG(10,("open_acl_xattr: get_nt_acl_attr_internal for "
 531                 "file %s returned %s\n",
 532                 fname,
 533                 nt_errstr(status) ));
 534
 535         fsp->fh->fd = SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);
 536
 537         if (!file_existed && fsp->fh->fd != -1) {
 538                 /* File was created. Inherit from parent directory. */
 539                 string_set(&fsp->fsp_name, fname);
 540                 inherit_new_acl(handle, fname, fsp, false);
 541         }
 542
 543         return fsp->fh->fd;
 544 }
 545
 546 /*********************************************************************
 547  On unlink we need to delete the tdb record (if using tdb).
 548 *********************************************************************/
 549
 550 static int unlink_acl_xattr(vfs_handle_struct *handle, const char *path)
 551 {
 552         SMB_STRUCT_STAT sbuf;
 553         struct file_id id;
 554         struct db_context *db;
 555         struct db_record *rec;
 556         int ret;
 557
 558         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
 559
 560         if (SMB_VFS_STAT(handle->conn, path, &sbuf) == -1) {
 561                 return -1;
 562         }
 563
 564         ret = SMB_VFS_NEXT_UNLINK(handle, path);
 565
 566         if (ret == -1) {
 567                 return -1;
 568         }
 569
 570         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
 571
 572         rec = acl_xattr_tdb_lock(talloc_tos(), db, &id);
 573
 574         /*
 575          * If rec == NULL there's not much we can do about it
 576          */
 577
 578         if (rec == NULL) {
 579                 DEBUG(10,("unlink_acl_xattr: path %s rec == NULL\n",
 580                         path ));
 581                 TALLOC_FREE(rec);
 582                 return 0;
 583         }
 584
 585         rec->delete_rec(rec);
 586         TALLOC_FREE(rec);
 587
 588         return 0;
 589 }
 590
 591 /*********************************************************************
 592  Store an inherited SD on mkdir.
 593 *********************************************************************/
 594
 595 static int mkdir_acl_xattr(vfs_handle_struct *handle, const char *path, mode_t mode)
 596 {
 597         int ret = SMB_VFS_NEXT_MKDIR(handle, path, mode);
 598
 599         if (ret == -1) {
 600                 return ret;
 601         }
 602         /* New directory - inherit from parent. */
 603         inherit_new_acl(handle, path, NULL, true);
 604         return ret;
 605 }
 606
 607 /*********************************************************************
 608  On rmdir we need to delete the tdb record (if using tdb).
 609 *********************************************************************/
 610
 611 static int rmdir_acl_xattr(vfs_handle_struct *handle, const char *path)
 612 {
 613         SMB_STRUCT_STAT sbuf;
 614         struct file_id id;
 615         struct db_context *db;
 616         struct db_record *rec;
 617         int ret;
 618
 619         SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
 620
 621         if (SMB_VFS_STAT(handle->conn, path, &sbuf) == -1) {
 622                 return -1;
 623         }
 624
 625         ret = SMB_VFS_NEXT_RMDIR(handle, path);
 626
 627         if (ret == -1) {
 628                 return -1;
 629         }
 630
 631         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
 632
 633         rec = acl_xattr_tdb_lock(talloc_tos(), db, &id);
 634
 635         /*
 636          * If rec == NULL there's not much we can do about it
 637          */
 638
 639         if (rec == NULL) {
 640                 DEBUG(10,("rmdir_acl_xattr: path %s rec == NULL\n",
 641                         path ));
 642                 TALLOC_FREE(rec);
 643                 return 0;
 644         }
 645
 646         rec->delete_rec(rec);
 647         TALLOC_FREE(rec);
 648
 649         return 0;
 650 }
 651
 652 /*********************************************************************
 653  Fetch a security descriptor given an fsp.
 654 *********************************************************************/
 655
 656 static NTSTATUS fget_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
 657         uint32 security_info, struct security_descriptor **ppdesc)
 658 {
 659         NTSTATUS status = get_nt_acl_xattr_internal(handle, fsp,
 660                                 NULL, security_info, ppdesc);
 661         if (NT_STATUS_IS_OK(status)) {
 662                 if (DEBUGLEVEL >= 10) {
 663                         DEBUG(10,("fget_nt_acl_xattr: returning xattr sd for file %s\n",
 664                                 fsp->fsp_name));
 665                         NDR_PRINT_DEBUG(security_descriptor, *ppdesc);
 666                 }
 667                 return NT_STATUS_OK;
 668         }
 669
 670         DEBUG(10,("fget_nt_acl_xattr: failed to get xattr sd for file %s, Error %s\n",
 671                         fsp->fsp_name,
 672                         nt_errstr(status) ));
 673
 674         return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp,
 675                         security_info, ppdesc);
 676 }
 677
 678 /*********************************************************************
 679  Fetch a security descriptor given a pathname.
 680 *********************************************************************/
 681
 682 static NTSTATUS get_nt_acl_xattr(vfs_handle_struct *handle,
 683         const char *name, uint32 security_info, struct security_descriptor **ppdesc)
 684 {
 685         NTSTATUS status = get_nt_acl_xattr_internal(handle, NULL,
 686                                 name, security_info, ppdesc);
 687         if (NT_STATUS_IS_OK(status)) {
 688                 if (DEBUGLEVEL >= 10) {
 689                         DEBUG(10,("get_nt_acl_xattr: returning xattr sd for file %s\n",
 690                                 name));
 691                         NDR_PRINT_DEBUG(security_descriptor, *ppdesc);
 692                 }
 693                 return NT_STATUS_OK;
 694         }
 695
 696         DEBUG(10,("get_nt_acl_xattr: failed to get xattr sd for file %s, Error %s\n",
 697                         name,
 698                         nt_errstr(status) ));
 699
 700         return SMB_VFS_NEXT_GET_NT_ACL(handle, name,
 701                         security_info, ppdesc);
 702 }
 703
 704 /*********************************************************************
 705  Store a security descriptor given an fsp.
 706 *********************************************************************/
 707
 708 static NTSTATUS fset_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
 709         uint32 security_info_sent, const struct security_descriptor *psd)
 710 {
 711         NTSTATUS status;
 712         DATA_BLOB blob;
 713
 714         if (DEBUGLEVEL >= 10) {
 715                 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
 716                         fsp->fsp_name));
 717                 NDR_PRINT_DEBUG(security_descriptor,
 718                         CONST_DISCARD(struct security_descriptor *,psd));
 719         }
 720
 721         status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 722         if (!NT_STATUS_IS_OK(status)) {
 723                 return status;
 724         }
 725
 726         /* Ensure owner and group are set. */
 727         if (!psd->owner_sid || !psd->group_sid) {
 728                 int ret;
 729                 SMB_STRUCT_STAT sbuf;
 730                 DOM_SID owner_sid, group_sid;
 731                 struct security_descriptor *nc_psd = dup_sec_desc(talloc_tos(), psd);
 732
 733                 if (!nc_psd) {
 734                         return NT_STATUS_OK;
 735                 }
 736                 if (fsp->is_directory || fsp->fh->fd == -1) {
 737                         ret = SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf);
 738                 } else {
 739                         ret = SMB_VFS_FSTAT(fsp, &sbuf);
 740                 }
 741                 if (ret == -1) {
 742                         /* Lower level acl set succeeded,
 743                          * so still return OK. */
 744                         return NT_STATUS_OK;
 745                 }
 746                 create_file_sids(&sbuf, &owner_sid, &group_sid);
 747                 /* This is safe as nc_psd is discarded at fn exit. */
 748                 nc_psd->owner_sid = &owner_sid;
 749                 nc_psd->group_sid = &group_sid;
 750                 security_info_sent |= (OWNER_SECURITY_INFORMATION|GROUP_SECURITY_INFORMATION);
 751                 psd = nc_psd;
 752         }
 753
 754         if ((security_info_sent & DACL_SECURITY_INFORMATION) &&
 755                         psd->dacl != NULL &&
 756                         (psd->type & (SE_DESC_DACL_AUTO_INHERITED|
 757                                 SE_DESC_DACL_AUTO_INHERIT_REQ))==
 758                                 (SE_DESC_DACL_AUTO_INHERITED|
 759                                 SE_DESC_DACL_AUTO_INHERIT_REQ) ) {
 760                 struct security_descriptor *new_psd = NULL;
 761                 status = append_parent_acl(fsp, psd, &new_psd);
 762                 if (!NT_STATUS_IS_OK(status)) {
 763                         /* Lower level acl set succeeded,
 764                          * so still return OK. */
 765                         return NT_STATUS_OK;
 766                 }
 767                 psd = new_psd;
 768         }
 769
 770         if (DEBUGLEVEL >= 10) {
 771                 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
 772                         fsp->fsp_name));
 773                 NDR_PRINT_DEBUG(security_descriptor,
 774                         CONST_DISCARD(struct security_descriptor *,psd));
 775         }
 776         create_acl_blob(psd, &blob);
 777         store_acl_blob_fsp(handle, fsp, &blob);
 778
 779         return NT_STATUS_OK;
 780 }
 781
 782 /*******************************************************************
 783  Handle opening the storage tdb if so configured.
 784 *******************************************************************/
 785
 786 static int connect_acl_xattr(struct vfs_handle_struct *handle,
 787                                 const char *service,
 788                                 const char *user)
 789 {
 790         struct db_context *db;
 791         int res;
 792
 793         res = SMB_VFS_NEXT_CONNECT(handle, service, user);
 794         if (res < 0) {
 795                 return res;
 796         }
 797
 798         if (!acl_tdb_init(&db)) {
 799                 SMB_VFS_NEXT_DISCONNECT(handle);
 800                 return -1;
 801         }
 802
 803         SMB_VFS_HANDLE_SET_DATA(handle, db, free_acl_xattr_data,
 804                                 struct db_context, return -1);
 805
 806         return 0;
 807 }
 808
 809 /* VFS operations structure */
 810
 811 static vfs_op_tuple skel_op_tuples[] =
 812 {
 813         {SMB_VFS_OP(connect_acl_xattr), SMB_VFS_OP_CONNECT,  SMB_VFS_LAYER_TRANSPARENT},
 814
 815         {SMB_VFS_OP(mkdir_acl_xattr), SMB_VFS_OP_MKDIR, SMB_VFS_LAYER_TRANSPARENT},
 816         {SMB_VFS_OP(rmdir_acl_xattr), SMB_VFS_OP_RMDIR, SMB_VFS_LAYER_TRANSPARENT},
 817
 818         {SMB_VFS_OP(open_acl_xattr),  SMB_VFS_OP_OPEN,  SMB_VFS_LAYER_TRANSPARENT},
 819         {SMB_VFS_OP(unlink_acl_xattr), SMB_VFS_OP_UNLINK, SMB_VFS_LAYER_TRANSPARENT},
 820
 821         /* NT File ACL operations */
 822
 823         {SMB_VFS_OP(fget_nt_acl_xattr),SMB_VFS_OP_FGET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
 824         {SMB_VFS_OP(get_nt_acl_xattr), SMB_VFS_OP_GET_NT_ACL, SMB_VFS_LAYER_TRANSPARENT},
 825         {SMB_VFS_OP(fset_nt_acl_xattr),SMB_VFS_OP_FSET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
 826
 827         {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
 828 };
 829
 830 NTSTATUS vfs_acl_xattr_init(void)
 831 {
 832         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_tdb", skel_op_tuples);
 833 }