source3/modules/vfs_acl_xattr.c

   1 /*
   2  * Store Windows ACLs in xattrs.
   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 /*******************************************************************
  31  Parse out a struct security_descriptor from a DATA_BLOB.
  32 *******************************************************************/
  33
  34 static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
  35                                 uint32 security_info,
  36                                 struct security_descriptor **ppdesc)
  37 {
  38         TALLOC_CTX *ctx = talloc_tos();
  39         struct xattr_NTACL xacl;
  40         enum ndr_err_code ndr_err;
  41         size_t sd_size;
  42
  43         ndr_err = ndr_pull_struct_blob(pblob, ctx, NULL, &xacl,
  44                         (ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
  45
  46         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  47                 DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
  48                         ndr_errstr(ndr_err)));
  49                 return ndr_map_error2ntstatus(ndr_err);;
  50         }
  51
  52         if (xacl.version != 2) {
  53                 return NT_STATUS_REVISION_MISMATCH;
  54         }
  55
  56         *ppdesc = make_sec_desc(ctx, SEC_DESC_REVISION, xacl.info.sd_hs->sd->type | SEC_DESC_SELF_RELATIVE,
  57                         (security_info & OWNER_SECURITY_INFORMATION)
  58                         ? xacl.info.sd_hs->sd->owner_sid : NULL,
  59                         (security_info & GROUP_SECURITY_INFORMATION)
  60                         ? xacl.info.sd_hs->sd->group_sid : NULL,
  61                         (security_info & SACL_SECURITY_INFORMATION)
  62                         ? xacl.info.sd_hs->sd->sacl : NULL,
  63                         (security_info & DACL_SECURITY_INFORMATION)
  64                         ? xacl.info.sd_hs->sd->dacl : NULL,
  65                         &sd_size);
  66
  67         TALLOC_FREE(xacl.info.sd);
  68
  69         return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
  70 }
  71
  72 /*******************************************************************
  73  Pull a security descriptor into a DATA_BLOB from a xattr.
  74 *******************************************************************/
  75
  76 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
  77                         vfs_handle_struct *handle,
  78                         files_struct *fsp,
  79                         const char *name,
  80                         DATA_BLOB *pblob)
  81 {
  82         size_t size = 1024;
  83         uint8_t *val = NULL;
  84         uint8_t *tmp;
  85         ssize_t sizeret;
  86         int saved_errno = 0;
  87
  88         ZERO_STRUCTP(pblob);
  89
  90   again:
  91
  92         tmp = TALLOC_REALLOC_ARRAY(ctx, val, uint8_t, size);
  93         if (tmp == NULL) {
  94                 TALLOC_FREE(val);
  95                 return NT_STATUS_NO_MEMORY;
  96         }
  97         val = tmp;
  98
  99         become_root();
 100         if (fsp && fsp->fh->fd != -1) {
 101                 sizeret = SMB_VFS_FGETXATTR(fsp, XATTR_NTACL_NAME, val, size);
 102         } else {
 103                 sizeret = SMB_VFS_GETXATTR(handle->conn, name,
 104                                         XATTR_NTACL_NAME, val, size);
 105         }
 106         if (sizeret == -1) {
 107                 saved_errno = errno;
 108         }
 109         unbecome_root();
 110
 111         /* Max ACL size is 65536 bytes. */
 112         if (sizeret == -1) {
 113                 errno = saved_errno;
 114                 if ((errno == ERANGE) && (size != 65536)) {
 115                         /* Too small, try again. */
 116                         size = 65536;
 117                         goto again;
 118                 }
 119
 120                 /* Real error - exit here. */
 121                 TALLOC_FREE(val);
 122                 return map_nt_error_from_unix(errno);
 123         }
 124
 125         pblob->data = val;
 126         pblob->length = sizeret;
 127         return NT_STATUS_OK;
 128 }
 129
 130 /*******************************************************************
 131  Create a DATA_BLOB from a security descriptor.
 132 *******************************************************************/
 133
 134 static NTSTATUS create_acl_blob(const struct security_descriptor *psd, DATA_BLOB *pblob)
 135 {
 136         struct xattr_NTACL xacl;
 137         struct security_descriptor_hash sd_hs;
 138         enum ndr_err_code ndr_err;
 139         TALLOC_CTX *ctx = talloc_tos();
 140
 141         ZERO_STRUCT(xacl);
 142         ZERO_STRUCT(sd_hs);
 143
 144         xacl.version = 2;
 145         xacl.info.sd_hs = &sd_hs;
 146         xacl.info.sd_hs->sd = CONST_DISCARD(struct security_descriptor *, psd);
 147         memset(&xacl.info.sd_hs->hash[0], '\0', 16);
 148
 149         ndr_err = ndr_push_struct_blob(
 150                         pblob, ctx, NULL, &xacl,
 151                         (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
 152
 153         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 154                 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
 155                         ndr_errstr(ndr_err)));
 156                 return ndr_map_error2ntstatus(ndr_err);;
 157         }
 158
 159         return NT_STATUS_OK;
 160 }
 161
 162 /*******************************************************************
 163  Store a DATA_BLOB into an xattr given an fsp pointer.
 164 *******************************************************************/
 165
 166 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
 167                                 files_struct *fsp,
 168                                 DATA_BLOB *pblob)
 169 {
 170         int ret;
 171         int saved_errno = 0;
 172
 173         DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
 174                         (unsigned int)pblob->length, fsp->fsp_name));
 175
 176         become_root();
 177         if (fsp->fh->fd != -1) {
 178                 ret = SMB_VFS_FSETXATTR(fsp, XATTR_NTACL_NAME,
 179                         pblob->data, pblob->length, 0);
 180         } else {
 181                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name,
 182                                 XATTR_NTACL_NAME,
 183                                 pblob->data, pblob->length, 0);
 184         }
 185         if (ret) {
 186                 saved_errno = errno;
 187         }
 188         unbecome_root();
 189         if (ret) {
 190                 errno = saved_errno;
 191                 DEBUG(5, ("store_acl_blob_fsp: setting attr failed for file %s"
 192                         "with error %s\n",
 193                         fsp->fsp_name,
 194                         strerror(errno) ));
 195                 return map_nt_error_from_unix(errno);
 196         }
 197         return NT_STATUS_OK;
 198 }
 199
 200 /*******************************************************************
 201  Store a DATA_BLOB into an xattr given a pathname.
 202 *******************************************************************/
 203
 204 static NTSTATUS store_acl_blob_pathname(vfs_handle_struct *handle,
 205                                         const char *fname,
 206                                         DATA_BLOB *pblob)
 207 {
 208         connection_struct *conn = handle->conn;
 209         int ret;
 210         int saved_errno = 0;
 211
 212         DEBUG(10,("store_acl_blob_pathname: storing blob "
 213                         "length %u on file %s\n",
 214                         (unsigned int)pblob->length, fname));
 215
 216         become_root();
 217         ret = SMB_VFS_SETXATTR(conn, fname,
 218                                 XATTR_NTACL_NAME,
 219                                 pblob->data, pblob->length, 0);
 220         if (ret) {
 221                 saved_errno = errno;
 222         }
 223         unbecome_root();
 224         if (ret) {
 225                 errno = saved_errno;
 226                 DEBUG(5, ("store_acl_blob_pathname: setting attr failed "
 227                         "for file %s with error %s\n",
 228                         fname,
 229                         strerror(errno) ));
 230                 return map_nt_error_from_unix(errno);
 231         }
 232         return NT_STATUS_OK;
 233 }
 234
 235 /*******************************************************************
 236  Store a DATA_BLOB into an xattr given a pathname.
 237 *******************************************************************/
 238
 239 static NTSTATUS get_nt_acl_xattr_internal(vfs_handle_struct *handle,
 240                                         files_struct *fsp,
 241                                         const char *name,
 242                                         uint32 security_info,
 243                                         struct security_descriptor **ppdesc)
 244 {
 245         TALLOC_CTX *ctx = talloc_tos();
 246         DATA_BLOB blob;
 247         NTSTATUS status;
 248
 249         if (fsp && name == NULL) {
 250                 name = fsp->fsp_name;
 251         }
 252
 253         DEBUG(10, ("get_nt_acl_xattr_internal: name=%s\n", name));
 254
 255         status = get_acl_blob(ctx, handle, fsp, name, &blob);
 256         if (!NT_STATUS_IS_OK(status)) {
 257                 DEBUG(10, ("get_acl_blob returned %s\n", nt_errstr(status)));
 258                 return status;
 259         }
 260
 261         status = parse_acl_blob(&blob, security_info, ppdesc);
 262         if (!NT_STATUS_IS_OK(status)) {
 263                 DEBUG(10, ("parse_acl_blob returned %s\n",
 264                                 nt_errstr(status)));
 265                 return status;
 266         }
 267
 268         TALLOC_FREE(blob.data);
 269         return status;
 270 }
 271
 272 /*********************************************************************
 273  Create a default security descriptor for a file in case no inheritance
 274  exists. All permissions to the owner and SYSTEM.
 275 *********************************************************************/
 276
 277 static struct security_descriptor *default_file_sd(TALLOC_CTX *mem_ctx,
 278                                                 SMB_STRUCT_STAT *psbuf)
 279 {
 280         struct dom_sid owner_sid, group_sid;
 281         size_t sd_size;
 282         struct security_ace *pace = NULL;
 283         struct security_acl *pacl = NULL;
 284
 285         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
 286         gid_to_sid(&group_sid, psbuf->st_ex_gid);
 287
 288         pace = TALLOC_ARRAY(mem_ctx, struct security_ace, 2);
 289         if (!pace) {
 290                 return NULL;
 291         }
 292
 293         init_sec_ace(&pace[0], &owner_sid, SEC_ACE_TYPE_ACCESS_ALLOWED,
 294                         SEC_RIGHTS_FILE_ALL, 0);
 295         init_sec_ace(&pace[1], &global_sid_System, SEC_ACE_TYPE_ACCESS_ALLOWED,
 296                         SEC_RIGHTS_FILE_ALL, 0);
 297
 298         pacl = make_sec_acl(mem_ctx,
 299                                 NT4_ACL_REVISION,
 300                                 2,
 301                                 pace);
 302         if (!pacl) {
 303                 return NULL;
 304         }
 305         return make_sec_desc(mem_ctx,
 306                         SECURITY_DESCRIPTOR_REVISION_1,
 307                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
 308                         &owner_sid,
 309                         &group_sid,
 310                         NULL,
 311                         pacl,
 312                         &sd_size);
 313 }
 314
 315 /*********************************************************************
 316 *********************************************************************/
 317
 318 static NTSTATUS inherit_new_acl(vfs_handle_struct *handle,
 319                                         const char *fname,
 320                                         files_struct *fsp,
 321                                         bool container)
 322 {
 323         TALLOC_CTX *ctx = talloc_tos();
 324         NTSTATUS status;
 325         struct security_descriptor *parent_desc = NULL;
 326         struct security_descriptor *psd = NULL;
 327         DATA_BLOB blob;
 328         size_t size;
 329         char *parent_name;
 330
 331         if (!parent_dirname(ctx, fname, &parent_name, NULL)) {
 332                 return NT_STATUS_NO_MEMORY;
 333         }
 334
 335         DEBUG(10,("inherit_new_acl: check directory %s\n",
 336                         parent_name));
 337
 338         status = get_nt_acl_xattr_internal(handle,
 339                                         NULL,
 340                                         parent_name,
 341                                         (OWNER_SECURITY_INFORMATION |
 342                                          GROUP_SECURITY_INFORMATION |
 343                                          DACL_SECURITY_INFORMATION),
 344                                         &parent_desc);
 345         if (NT_STATUS_IS_OK(status)) {
 346                 /* Create an inherited descriptor from the parent. */
 347
 348                 if (DEBUGLEVEL >= 10) {
 349                         DEBUG(10,("inherit_new_acl: parent acl is:\n"));
 350                         NDR_PRINT_DEBUG(security_descriptor, parent_desc);
 351                 }
 352
 353                 status = se_create_child_secdesc(ctx,
 354                                 &psd,
 355                                 &size,
 356                                 parent_desc,
 357                                 &handle->conn->server_info->ptok->user_sids[PRIMARY_USER_SID_INDEX],
 358                                 &handle->conn->server_info->ptok->user_sids[PRIMARY_GROUP_SID_INDEX],
 359                                 container);
 360                 if (!NT_STATUS_IS_OK(status)) {
 361                         return status;
 362                 }
 363
 364                 if (DEBUGLEVEL >= 10) {
 365                         DEBUG(10,("inherit_new_acl: child acl is:\n"));
 366                         NDR_PRINT_DEBUG(security_descriptor, psd);
 367                 }
 368
 369         } else {
 370                 DEBUG(10,("inherit_new_acl: directory %s failed "
 371                         "to get acl %s\n",
 372                         parent_name,
 373                         nt_errstr(status) ));
 374         }
 375
 376         if (!psd || psd->dacl == NULL) {
 377                 SMB_STRUCT_STAT sbuf;
 378                 int ret;
 379
 380                 TALLOC_FREE(psd);
 381                 if (fsp && !fsp->is_directory && fsp->fh->fd != -1) {
 382                         ret = SMB_VFS_FSTAT(fsp, &sbuf);
 383                 } else {
 384                         if (fsp && fsp->posix_open) {
 385                                 ret = vfs_lstat_smb_fname(handle->conn, fname,
 386                                                           &sbuf);
 387                         } else {
 388                                 ret = vfs_stat_smb_fname(handle->conn, fname,
 389                                                          &sbuf);
 390                         }
 391                 }
 392                 if (ret == -1) {
 393                         return map_nt_error_from_unix(errno);
 394                 }
 395                 psd = default_file_sd(ctx, &sbuf);
 396                 if (!psd) {
 397                         return NT_STATUS_NO_MEMORY;
 398                 }
 399
 400                 if (DEBUGLEVEL >= 10) {
 401                         DEBUG(10,("inherit_new_acl: default acl is:\n"));
 402                         NDR_PRINT_DEBUG(security_descriptor, psd);
 403                 }
 404         }
 405
 406         status = create_acl_blob(psd, &blob);
 407         if (!NT_STATUS_IS_OK(status)) {
 408                 return status;
 409         }
 410         if (fsp) {
 411                 return store_acl_blob_fsp(handle, fsp, &blob);
 412         } else {
 413                 return store_acl_blob_pathname(handle, fname, &blob);
 414         }
 415 }
 416
 417 /*********************************************************************
 418  Check ACL on open. For new files inherit from parent directory.
 419 *********************************************************************/
 420
 421 static int open_acl_xattr(vfs_handle_struct *handle,
 422                                         struct smb_filename *smb_fname,
 423                                         files_struct *fsp,
 424                                         int flags,
 425                                         mode_t mode)
 426 {
 427         uint32_t access_granted = 0;
 428         struct security_descriptor *pdesc = NULL;
 429         bool file_existed = true;
 430         char *fname = NULL;
 431         NTSTATUS status;
 432
 433         status = get_full_smb_filename(talloc_tos(), smb_fname,
 434                                        &fname);
 435         if (!NT_STATUS_IS_OK(status)) {
 436                 errno = map_errno_from_nt_status(status);
 437                 return -1;
 438         }
 439
 440         status = get_nt_acl_xattr_internal(handle,
 441                                         NULL,
 442                                         fname,
 443                                         (OWNER_SECURITY_INFORMATION |
 444                                          GROUP_SECURITY_INFORMATION |
 445                                          DACL_SECURITY_INFORMATION),
 446                                         &pdesc);
 447         if (NT_STATUS_IS_OK(status)) {
 448                 /* See if we can access it. */
 449                 status = smb1_file_se_access_check(pdesc,
 450                                         handle->conn->server_info->ptok,
 451                                         fsp->access_mask,
 452                                         &access_granted);
 453                 if (!NT_STATUS_IS_OK(status)) {
 454                         DEBUG(10,("open_acl_xattr: file %s open "
 455                                 "refused with error %s\n",
 456                                 smb_fname_str_dbg(smb_fname),
 457                                 nt_errstr(status) ));
 458                         errno = map_errno_from_nt_status(status);
 459                         return -1;
 460                 }
 461         } else if (NT_STATUS_EQUAL(status,NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 462                 file_existed = false;
 463         }
 464
 465         DEBUG(10,("open_acl_xattr: get_nt_acl_attr_internal for "
 466                 "file %s returned %s\n",
 467                 smb_fname_str_dbg(smb_fname),
 468                 nt_errstr(status) ));
 469
 470         fsp->fh->fd = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 471
 472         if (!file_existed && fsp->fh->fd != -1) {
 473                 /* File was created. Inherit from parent directory. */
 474                 string_set(&fsp->fsp_name, fname);
 475                 inherit_new_acl(handle, fname, fsp, false);
 476         }
 477
 478         return fsp->fh->fd;
 479 }
 480
 481 static int mkdir_acl_xattr(vfs_handle_struct *handle, const char *path, mode_t mode)
 482 {
 483         int ret = SMB_VFS_NEXT_MKDIR(handle, path, mode);
 484
 485         if (ret == -1) {
 486                 return ret;
 487         }
 488         /* New directory - inherit from parent. */
 489         inherit_new_acl(handle, path, NULL, true);
 490         return ret;
 491 }
 492
 493 /*********************************************************************
 494  Fetch a security descriptor given an fsp.
 495 *********************************************************************/
 496
 497 static NTSTATUS fget_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
 498         uint32 security_info, struct security_descriptor **ppdesc)
 499 {
 500         NTSTATUS status = get_nt_acl_xattr_internal(handle, fsp,
 501                                 NULL, security_info, ppdesc);
 502         if (NT_STATUS_IS_OK(status)) {
 503                 if (DEBUGLEVEL >= 10) {
 504                         DEBUG(10,("fget_nt_acl_xattr: returning xattr sd for file %s\n",
 505                                 fsp->fsp_name));
 506                         NDR_PRINT_DEBUG(security_descriptor, *ppdesc);
 507                 }
 508                 return NT_STATUS_OK;
 509         }
 510
 511         DEBUG(10,("fget_nt_acl_xattr: failed to get xattr sd for file %s, Error %s\n",
 512                         fsp->fsp_name,
 513                         nt_errstr(status) ));
 514
 515         return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp,
 516                         security_info, ppdesc);
 517 }
 518
 519 /*********************************************************************
 520  Fetch a security descriptor given a pathname.
 521 *********************************************************************/
 522
 523 static NTSTATUS get_nt_acl_xattr(vfs_handle_struct *handle,
 524         const char *name, uint32 security_info, struct security_descriptor **ppdesc)
 525 {
 526         NTSTATUS status = get_nt_acl_xattr_internal(handle, NULL,
 527                                 name, security_info, ppdesc);
 528         if (NT_STATUS_IS_OK(status)) {
 529                 if (DEBUGLEVEL >= 10) {
 530                         DEBUG(10,("get_nt_acl_xattr: returning xattr sd for file %s\n",
 531                                 name));
 532                         NDR_PRINT_DEBUG(security_descriptor, *ppdesc);
 533                 }
 534                 return NT_STATUS_OK;
 535         }
 536
 537         DEBUG(10,("get_nt_acl_xattr: failed to get xattr sd for file %s, Error %s\n",
 538                         name,
 539                         nt_errstr(status) ));
 540
 541         return SMB_VFS_NEXT_GET_NT_ACL(handle, name,
 542                         security_info, ppdesc);
 543 }
 544
 545 /*********************************************************************
 546  Store a security descriptor given an fsp.
 547 *********************************************************************/
 548
 549 static NTSTATUS fset_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
 550         uint32 security_info_sent, const struct security_descriptor *psd)
 551 {
 552         NTSTATUS status;
 553         DATA_BLOB blob;
 554
 555         if (DEBUGLEVEL >= 10) {
 556                 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
 557                         fsp->fsp_name));
 558                 NDR_PRINT_DEBUG(security_descriptor,
 559                         CONST_DISCARD(struct security_descriptor *,psd));
 560         }
 561
 562         status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 563         if (!NT_STATUS_IS_OK(status)) {
 564                 return status;
 565         }
 566
 567         /* Ensure owner and group are set. */
 568         if (!psd->owner_sid || !psd->group_sid) {
 569                 int ret;
 570                 SMB_STRUCT_STAT sbuf;
 571                 DOM_SID owner_sid, group_sid;
 572                 struct security_descriptor *nc_psd = dup_sec_desc(talloc_tos(), psd);
 573
 574                 if (!nc_psd) {
 575                         return NT_STATUS_OK;
 576                 }
 577                 if (fsp->is_directory || fsp->fh->fd == -1) {
 578                         if (fsp->posix_open) {
 579                                 ret = vfs_lstat_smb_fname(fsp->conn,
 580                                                           fsp->fsp_name,
 581                                                           &sbuf);
 582                         } else {
 583                                 ret = vfs_stat_smb_fname(fsp->conn,
 584                                                          fsp->fsp_name,
 585                                                          &sbuf);
 586                         }
 587                 } else {
 588                         ret = SMB_VFS_FSTAT(fsp, &sbuf);
 589                 }
 590                 if (ret == -1) {
 591                         /* Lower level acl set succeeded,
 592                          * so still return OK. */
 593                         return NT_STATUS_OK;
 594                 }
 595                 create_file_sids(&sbuf, &owner_sid, &group_sid);
 596                 /* This is safe as nc_psd is discarded at fn exit. */
 597                 nc_psd->owner_sid = &owner_sid;
 598                 nc_psd->group_sid = &group_sid;
 599                 security_info_sent |= (OWNER_SECURITY_INFORMATION|GROUP_SECURITY_INFORMATION);
 600                 psd = nc_psd;
 601         }
 602
 603 #if 0
 604         if ((security_info_sent & DACL_SECURITY_INFORMATION) &&
 605                         psd->dacl != NULL &&
 606                         (psd->type & (SE_DESC_DACL_AUTO_INHERITED|
 607                                 SE_DESC_DACL_AUTO_INHERIT_REQ))==
 608                                 (SE_DESC_DACL_AUTO_INHERITED|
 609                                 SE_DESC_DACL_AUTO_INHERIT_REQ) ) {
 610                 struct security_descriptor *new_psd = NULL;
 611                 status = append_parent_acl(fsp, psd, &new_psd);
 612                 if (!NT_STATUS_IS_OK(status)) {
 613                         /* Lower level acl set succeeded,
 614                          * so still return OK. */
 615                         return NT_STATUS_OK;
 616                 }
 617                 psd = new_psd;
 618         }
 619 #endif
 620
 621         if (DEBUGLEVEL >= 10) {
 622                 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
 623                         fsp->fsp_name));
 624                 NDR_PRINT_DEBUG(security_descriptor,
 625                         CONST_DISCARD(struct security_descriptor *,psd));
 626         }
 627         create_acl_blob(psd, &blob);
 628         store_acl_blob_fsp(handle, fsp, &blob);
 629
 630         return NT_STATUS_OK;
 631 }
 632
 633 /*********************************************************************
 634  Remove a Windows ACL - we're setting the underlying POSIX ACL.
 635 *********************************************************************/
 636
 637 static int sys_acl_set_file_xattr(vfs_handle_struct *handle,
 638                               const char *name,
 639                               SMB_ACL_TYPE_T type,
 640                               SMB_ACL_T theacl)
 641 {
 642         int ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
 643                                                 name,
 644                                                 type,
 645                                                 theacl);
 646         if (ret == -1) {
 647                 return -1;
 648         }
 649
 650         become_root();
 651         SMB_VFS_REMOVEXATTR(handle->conn, name, XATTR_NTACL_NAME);
 652         unbecome_root();
 653
 654         return ret;
 655 }
 656
 657 /*********************************************************************
 658  Remove a Windows ACL - we're setting the underlying POSIX ACL.
 659 *********************************************************************/
 660
 661 static int sys_acl_set_fd_xattr(vfs_handle_struct *handle,
 662                             files_struct *fsp,
 663                             SMB_ACL_T theacl)
 664 {
 665         int ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
 666                                                 fsp,
 667                                                 theacl);
 668         if (ret == -1) {
 669                 return -1;
 670         }
 671
 672         become_root();
 673         SMB_VFS_FREMOVEXATTR(fsp, XATTR_NTACL_NAME);
 674         unbecome_root();
 675
 676         return ret;
 677 }
 678
 679 /* VFS operations structure */
 680
 681 static vfs_op_tuple skel_op_tuples[] =
 682 {
 683         {SMB_VFS_OP(mkdir_acl_xattr), SMB_VFS_OP_MKDIR, SMB_VFS_LAYER_TRANSPARENT},
 684         {SMB_VFS_OP(open_acl_xattr),  SMB_VFS_OP_OPEN,  SMB_VFS_LAYER_TRANSPARENT},
 685
 686         /* NT File ACL operations */
 687
 688         {SMB_VFS_OP(fget_nt_acl_xattr),SMB_VFS_OP_FGET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
 689         {SMB_VFS_OP(get_nt_acl_xattr), SMB_VFS_OP_GET_NT_ACL, SMB_VFS_LAYER_TRANSPARENT},
 690         {SMB_VFS_OP(fset_nt_acl_xattr),SMB_VFS_OP_FSET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
 691
 692         /* POSIX ACL operations. */
 693         {SMB_VFS_OP(sys_acl_set_file_xattr), SMB_VFS_OP_SYS_ACL_SET_FILE, SMB_VFS_LAYER_TRANSPARENT},
 694         {SMB_VFS_OP(sys_acl_set_fd_xattr), SMB_VFS_OP_SYS_ACL_SET_FD, SMB_VFS_LAYER_TRANSPARENT},
 695
 696         {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
 697 };
 698
 699 NTSTATUS vfs_acl_xattr_init(void)
 700 {
 701         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_xattr", skel_op_tuples);
 702 }