source3/modules/vfs_acl_common.c

   1 /*
   2  * Store Windows ACLs in data store - common functions.
   3  * #included into modules/vfs_acl_xattr.c and modules/vfs_acl_tdb.c
   4  *
   5  * Copyright (C) Volker Lendecke, 2008
   6  * Copyright (C) Jeremy Allison, 2009
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
  23                         DATA_BLOB *pblob,
  24                         uint16_t hash_type,
  25                         uint8_t hash[XATTR_SD_HASH_SIZE]);
  26
  27 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
  28                         vfs_handle_struct *handle,
  29                         files_struct *fsp,
  30                         const char *name,
  31                         DATA_BLOB *pblob);
  32
  33 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
  34                         files_struct *fsp,
  35                         DATA_BLOB *pblob);
  36
  37 static NTSTATUS store_acl_blob_pathname(vfs_handle_struct *handle,
  38                         const char *fname,
  39                         DATA_BLOB *pblob);
  40
  41 #define HASH_SECURITY_INFO (OWNER_SECURITY_INFORMATION | \
  42                                 GROUP_SECURITY_INFORMATION | \
  43                                 DACL_SECURITY_INFORMATION | \
  44                                 SACL_SECURITY_INFORMATION)
  45
  46 /*******************************************************************
  47  Hash a security descriptor.
  48 *******************************************************************/
  49
  50 static NTSTATUS hash_sd_sha256(struct security_descriptor *psd,
  51                         uint8_t *hash)
  52 {
  53         DATA_BLOB blob;
  54         SHA256_CTX tctx;
  55         NTSTATUS status;
  56
  57         memset(hash, '\0', XATTR_SD_HASH_SIZE);
  58         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
  59         if (!NT_STATUS_IS_OK(status)) {
  60                 return status;
  61         }
  62
  63         SHA256_Init(&tctx);
  64         SHA256_Update(&tctx, blob.data, blob.length);
  65         SHA256_Final(hash, &tctx);
  66
  67         return NT_STATUS_OK;
  68 }
  69
  70 /*******************************************************************
  71  Parse out a struct security_descriptor from a DATA_BLOB.
  72 *******************************************************************/
  73
  74 static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
  75                                 struct security_descriptor **ppdesc,
  76                                 uint16_t *p_hash_type,
  77                                 uint8_t hash[XATTR_SD_HASH_SIZE])
  78 {
  79         TALLOC_CTX *ctx = talloc_tos();
  80         struct xattr_NTACL xacl;
  81         enum ndr_err_code ndr_err;
  82         size_t sd_size;
  83
  84         ndr_err = ndr_pull_struct_blob(pblob, ctx, NULL, &xacl,
  85                         (ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
  86
  87         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  88                 DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
  89                         ndr_errstr(ndr_err)));
  90                 return ndr_map_error2ntstatus(ndr_err);;
  91         }
  92
  93         switch (xacl.version) {
  94                 case 2:
  95                         *ppdesc = make_sec_desc(ctx, SEC_DESC_REVISION,
  96                                         xacl.info.sd_hs2->sd->type | SEC_DESC_SELF_RELATIVE,
  97                                         xacl.info.sd_hs2->sd->owner_sid,
  98                                         xacl.info.sd_hs2->sd->group_sid,
  99                                         xacl.info.sd_hs2->sd->sacl,
 100                                         xacl.info.sd_hs2->sd->dacl,
 101                                         &sd_size);
 102                         /* No hash - null out. */
 103                         *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
 104                         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 105                         break;
 106                 case 3:
 107                         *ppdesc = make_sec_desc(ctx, SEC_DESC_REVISION,
 108                                         xacl.info.sd_hs3->sd->type | SEC_DESC_SELF_RELATIVE,
 109                                         xacl.info.sd_hs3->sd->owner_sid,
 110                                         xacl.info.sd_hs3->sd->group_sid,
 111                                         xacl.info.sd_hs3->sd->sacl,
 112                                         xacl.info.sd_hs3->sd->dacl,
 113                                         &sd_size);
 114                         *p_hash_type = xacl.info.sd_hs3->hash_type;
 115                         /* Current version 3. */
 116                         memcpy(hash, xacl.info.sd_hs3->hash, XATTR_SD_HASH_SIZE);
 117                         break;
 118                 default:
 119                         return NT_STATUS_REVISION_MISMATCH;
 120         }
 121
 122         TALLOC_FREE(xacl.info.sd);
 123
 124         return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
 125 }
 126
 127 /*******************************************************************
 128  Create a DATA_BLOB from a security descriptor.
 129 *******************************************************************/
 130
 131 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
 132                         DATA_BLOB *pblob,
 133                         uint16_t hash_type,
 134                         uint8_t hash[XATTR_SD_HASH_SIZE])
 135 {
 136         struct xattr_NTACL xacl;
 137         struct security_descriptor_hash_v3 sd_hs3;
 138         enum ndr_err_code ndr_err;
 139         TALLOC_CTX *ctx = talloc_tos();
 140
 141         ZERO_STRUCT(xacl);
 142         ZERO_STRUCT(sd_hs3);
 143
 144         xacl.version = 3;
 145         xacl.info.sd_hs3 = &sd_hs3;
 146         xacl.info.sd_hs3->sd = CONST_DISCARD(struct security_descriptor *, psd);
 147         xacl.info.sd_hs3->hash_type = hash_type;
 148         memcpy(&xacl.info.sd_hs3->hash[0], hash, XATTR_SD_HASH_SIZE);
 149
 150         ndr_err = ndr_push_struct_blob(
 151                         pblob, ctx, NULL, &xacl,
 152                         (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
 153
 154         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 155                 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
 156                         ndr_errstr(ndr_err)));
 157                 return ndr_map_error2ntstatus(ndr_err);;
 158         }
 159
 160         return NT_STATUS_OK;
 161 }
 162
 163 /*******************************************************************
 164  Store a DATA_BLOB into an xattr given a pathname.
 165 *******************************************************************/
 166
 167 static NTSTATUS get_nt_acl_internal(vfs_handle_struct *handle,
 168                                 files_struct *fsp,
 169                                 const char *name,
 170                                 uint32_t security_info,
 171                                 struct security_descriptor **ppdesc)
 172 {
 173         DATA_BLOB blob;
 174         NTSTATUS status;
 175         uint16_t hash_type;
 176         uint8_t hash[XATTR_SD_HASH_SIZE];
 177         uint8_t hash_tmp[XATTR_SD_HASH_SIZE];
 178         struct security_descriptor *pdesc_next = NULL;
 179
 180         if (fsp && name == NULL) {
 181                 name = fsp->fsp_name->base_name;
 182         }
 183
 184         DEBUG(10, ("get_nt_acl_internal: name=%s\n", name));
 185
 186         status = get_acl_blob(talloc_tos(), handle, fsp, name, &blob);
 187         if (!NT_STATUS_IS_OK(status)) {
 188                 DEBUG(10, ("get_acl_blob returned %s\n", nt_errstr(status)));
 189                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 190                         /* Pull the ACL from the underlying system. */
 191                         if (fsp) {
 192                                 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 193                                                                 fsp,
 194                                                                 security_info,
 195                                                                 ppdesc);
 196                         } else {
 197                                 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 198                                                                 name,
 199                                                                 security_info,
 200                                                                 ppdesc);
 201                         }
 202                 }
 203                 return status;
 204         }
 205
 206         status = parse_acl_blob(&blob, ppdesc,
 207                                 &hash_type, &hash[0]);
 208         if (!NT_STATUS_IS_OK(status)) {
 209                 DEBUG(10, ("parse_acl_blob returned %s\n",
 210                                 nt_errstr(status)));
 211                 return status;
 212         }
 213
 214         /* Ensure the hash type is one we know. */
 215         switch (hash_type) {
 216                 case XATTR_SD_HASH_TYPE_NONE:
 217                         /* No hash, goto return blob sd. */
 218                         goto out;
 219                 case XATTR_SD_HASH_TYPE_SHA256:
 220                         break;
 221                 default:
 222                         return NT_STATUS_REVISION_MISMATCH;
 223         }
 224
 225         /* Get the full underlying sd, then hash. */
 226         if (fsp) {
 227                 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 228                                 fsp,
 229                                 HASH_SECURITY_INFO,
 230                                 &pdesc_next);
 231         } else {
 232                 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 233                                 name,
 234                                 HASH_SECURITY_INFO,
 235                                 &pdesc_next);
 236         }
 237
 238         if (!NT_STATUS_IS_OK(status)) {
 239                 goto out;
 240         }
 241
 242         status = hash_sd_sha256(pdesc_next, hash_tmp);
 243         if (!NT_STATUS_IS_OK(status)) {
 244                 goto out;
 245         }
 246
 247         if (memcmp(&hash[0], &hash_tmp[0], XATTR_SD_HASH_SIZE) == 0) {
 248                 TALLOC_FREE(pdesc_next);
 249                 /* Hash matches, return blob sd. */
 250                 goto out;
 251         }
 252
 253         /* Hash doesn't match, return underlying sd. */
 254
 255         if (!(security_info & OWNER_SECURITY_INFORMATION)) {
 256                 pdesc_next->owner_sid = NULL;
 257         }
 258         if (!(security_info & GROUP_SECURITY_INFORMATION)) {
 259                 pdesc_next->group_sid = NULL;
 260         }
 261         if (!(security_info & DACL_SECURITY_INFORMATION)) {
 262                 pdesc_next->dacl = NULL;
 263         }
 264         if (!(security_info & SACL_SECURITY_INFORMATION)) {
 265                 pdesc_next->sacl = NULL;
 266         }
 267
 268         TALLOC_FREE(*ppdesc);
 269         *ppdesc = pdesc_next;
 270
 271   out:
 272
 273         if (!(security_info & OWNER_SECURITY_INFORMATION)) {
 274                 (*ppdesc)->owner_sid = NULL;
 275         }
 276         if (!(security_info & GROUP_SECURITY_INFORMATION)) {
 277                 (*ppdesc)->group_sid = NULL;
 278         }
 279         if (!(security_info & DACL_SECURITY_INFORMATION)) {
 280                 (*ppdesc)->dacl = NULL;
 281         }
 282         if (!(security_info & SACL_SECURITY_INFORMATION)) {
 283                 (*ppdesc)->sacl = NULL;
 284         }
 285
 286         TALLOC_FREE(blob.data);
 287         return status;
 288 }
 289
 290 /*********************************************************************
 291  Create a default security descriptor for a file in case no inheritance
 292  exists. All permissions to the owner and SYSTEM.
 293 *********************************************************************/
 294
 295 static struct security_descriptor *default_file_sd(TALLOC_CTX *mem_ctx,
 296                                                 SMB_STRUCT_STAT *psbuf,
 297                                                 bool force_inherit)
 298 {
 299         struct dom_sid owner_sid, group_sid;
 300         size_t sd_size;
 301         struct security_ace *pace = NULL;
 302         struct security_acl *pacl = NULL;
 303
 304         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
 305         gid_to_sid(&group_sid, psbuf->st_ex_gid);
 306
 307         pace = TALLOC_ARRAY(mem_ctx, struct security_ace, 2);
 308         if (!pace) {
 309                 return NULL;
 310         }
 311
 312         /* If force_inherit is set, this means we are initializing the ACEs for
 313          * a container and we want the ACEs for owner_sid and "SYSTEM" to be
 314          * inheritable by their children (See Bug #6802).
 315          */
 316
 317         init_sec_ace(&pace[0], &owner_sid, SEC_ACE_TYPE_ACCESS_ALLOWED,
 318                         SEC_RIGHTS_FILE_ALL, (force_inherit ?
 319                                         (SEC_ACE_FLAG_OBJECT_INHERIT|
 320                                         SEC_ACE_FLAG_CONTAINER_INHERIT) :
 321                                         0));
 322
 323         init_sec_ace(&pace[1], &global_sid_System, SEC_ACE_TYPE_ACCESS_ALLOWED,
 324                         SEC_RIGHTS_FILE_ALL, (force_inherit ?
 325                                         (SEC_ACE_FLAG_OBJECT_INHERIT|
 326                                         SEC_ACE_FLAG_CONTAINER_INHERIT) :
 327                                         0));
 328
 329         pacl = make_sec_acl(mem_ctx,
 330                                 NT4_ACL_REVISION,
 331                                 2,
 332                                 pace);
 333         if (!pacl) {
 334                 return NULL;
 335         }
 336         return make_sec_desc(mem_ctx,
 337                         SECURITY_DESCRIPTOR_REVISION_1,
 338                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
 339                         &owner_sid,
 340                         &group_sid,
 341                         NULL,
 342                         pacl,
 343                         &sd_size);
 344 }
 345
 346 /*********************************************************************
 347 *********************************************************************/
 348
 349 static NTSTATUS inherit_new_acl(vfs_handle_struct *handle,
 350                                         struct smb_filename *smb_fname,
 351                                         files_struct *fsp,
 352                                         bool container)
 353 {
 354         TALLOC_CTX *ctx = talloc_tos();
 355         NTSTATUS status;
 356         struct security_descriptor *parent_desc = NULL;
 357         struct security_descriptor *psd = NULL;
 358         struct security_descriptor *pdesc_next = NULL;
 359         DATA_BLOB blob;
 360         size_t size;
 361         char *parent_name;
 362         bool force_inherit = false;
 363         uint8_t hash[XATTR_SD_HASH_SIZE];
 364
 365         if (!parent_dirname(ctx, smb_fname->base_name, &parent_name, NULL)) {
 366                 return NT_STATUS_NO_MEMORY;
 367         }
 368
 369         DEBUG(10,("inherit_new_acl: check directory %s\n",
 370                         parent_name));
 371
 372         status = get_nt_acl_internal(handle,
 373                                 NULL,
 374                                 parent_name,
 375                                 (OWNER_SECURITY_INFORMATION |
 376                                  GROUP_SECURITY_INFORMATION |
 377                                  DACL_SECURITY_INFORMATION),
 378                                 &parent_desc);
 379         if (NT_STATUS_IS_OK(status)) {
 380                 /* Create an inherited descriptor from the parent. */
 381
 382                 if (DEBUGLEVEL >= 10) {
 383                         DEBUG(10,("inherit_new_acl: parent acl is:\n"));
 384                         NDR_PRINT_DEBUG(security_descriptor, parent_desc);
 385                 }
 386
 387                 status = se_create_child_secdesc(ctx,
 388                                 &psd,
 389                                 &size,
 390                                 parent_desc,
 391                                 &handle->conn->server_info->ptok->user_sids[PRIMARY_USER_SID_INDEX],
 392                                 &handle->conn->server_info->ptok->user_sids[PRIMARY_GROUP_SID_INDEX],
 393                                 container);
 394                 if (!NT_STATUS_IS_OK(status)) {
 395                         return status;
 396                 }
 397
 398                 if (DEBUGLEVEL >= 10) {
 399                         DEBUG(10,("inherit_new_acl: child acl is:\n"));
 400                         NDR_PRINT_DEBUG(security_descriptor, psd);
 401                 }
 402
 403         } else {
 404                 DEBUG(10,("inherit_new_acl: directory %s failed "
 405                         "to get acl %s\n",
 406                         parent_name,
 407                         nt_errstr(status) ));
 408         }
 409
 410         if (!psd || psd->dacl == NULL) {
 411
 412                 TALLOC_FREE(psd);
 413                 if (fsp) {
 414                         status = vfs_stat_fsp(fsp);
 415                         smb_fname->st = fsp->fsp_name->st;
 416                 } else {
 417                         int ret;
 418                         if (lp_posix_pathnames()) {
 419                                 ret = SMB_VFS_LSTAT(handle->conn, smb_fname);
 420                         } else {
 421                                 ret = SMB_VFS_STAT(handle->conn, smb_fname);
 422                         }
 423                         if (ret == -1) {
 424                                 status = map_nt_error_from_unix(errno);
 425                         }
 426                 }
 427                 if (!NT_STATUS_IS_OK(status)) {
 428                         return status;
 429                 }
 430
 431                 /* If we get here, we could have the following possibilities:
 432                  *      1. No ACLs exist on the parent container.
 433                  *      2. ACLs exist on the parent container but they were
 434                  *      not inheritable.
 435                  *
 436                  *      Check to see if case #1 occurred.
 437                  *
 438                  */
 439                 if (container &&
 440                         (parent_desc == NULL || parent_desc->dacl == NULL)) {
 441
 442                         /* If no parent descriptor exists, then there were
 443                          * no ACLs on the parent and then we must create
 444                          * the ACLs on this newly created folder so that they
 445                          * will be inherited by their children (See Bug #6802).
 446                          */
 447
 448                         force_inherit = true;
 449                 }
 450
 451                 psd = default_file_sd(ctx, &smb_fname->st, force_inherit);
 452                 if (!psd) {
 453                         return NT_STATUS_NO_MEMORY;
 454                 }
 455
 456                 if (DEBUGLEVEL >= 10) {
 457                         DEBUG(10,("inherit_new_acl: default acl is:\n"));
 458                         NDR_PRINT_DEBUG(security_descriptor, psd);
 459                 }
 460         }
 461
 462         /* Object exists. Read the current SD to get the hash. */
 463         if (fsp) {
 464                 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 465                                 fsp,
 466                                 HASH_SECURITY_INFO,
 467                                 &pdesc_next);
 468         } else {
 469                 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 470                                 smb_fname->base_name,
 471                                 HASH_SECURITY_INFO,
 472                                 &pdesc_next);
 473         }
 474
 475         if (!NT_STATUS_IS_OK(status)) {
 476                 return status;
 477         }
 478
 479         status = hash_sd_sha256(pdesc_next, hash);
 480         if (!NT_STATUS_IS_OK(status)) {
 481                 return status;
 482         }
 483         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
 484         if (!NT_STATUS_IS_OK(status)) {
 485                 return status;
 486         }
 487         if (fsp) {
 488                 return store_acl_blob_fsp(handle, fsp, &blob);
 489         } else {
 490                 return store_acl_blob_pathname(handle, smb_fname->base_name,
 491                                                &blob);
 492         }
 493 }
 494
 495 static NTSTATUS check_parent_acl_common(vfs_handle_struct *handle,
 496                                 const char *path,
 497                                 uint32_t access_mask)
 498 {
 499         char *parent_name = NULL;
 500         struct security_descriptor *parent_desc = NULL;
 501         uint32_t access_granted = 0;
 502         NTSTATUS status;
 503
 504         if (!parent_dirname(talloc_tos(), path, &parent_name, NULL)) {
 505                 return NT_STATUS_NO_MEMORY;
 506         }
 507
 508         status = SMB_VFS_GET_NT_ACL(handle->conn,
 509                                         parent_name,
 510                                         (OWNER_SECURITY_INFORMATION |
 511                                          GROUP_SECURITY_INFORMATION |
 512                                          DACL_SECURITY_INFORMATION),
 513                                         &parent_desc);
 514         if (!NT_STATUS_IS_OK(status)) {
 515                 DEBUG(10,("check_parent_acl_common: SMB_VFS_GET_NT_ACL "
 516                         "on directory %s for "
 517                         "path %s returned %s\n",
 518                         parent_name,
 519                         path,
 520                         nt_errstr(status) ));
 521                 return status;
 522         }
 523         status = smb1_file_se_access_check(parent_desc,
 524                                         handle->conn->server_info->ptok,
 525                                         access_mask,
 526                                         &access_granted);
 527         if(!NT_STATUS_IS_OK(status)) {
 528                 DEBUG(10,("check_parent_acl_common: access check "
 529                         "on directory %s for "
 530                         "path %s for mask 0x%x returned %s\n",
 531                         parent_name,
 532                         path,
 533                         access_mask,
 534                         nt_errstr(status) ));
 535                 return status;
 536         }
 537         return NT_STATUS_OK;
 538 }
 539
 540 /*********************************************************************
 541  Check ACL on open. For new files inherit from parent directory.
 542 *********************************************************************/
 543
 544 static int open_acl_common(vfs_handle_struct *handle,
 545                         struct smb_filename *smb_fname,
 546                         files_struct *fsp,
 547                         int flags,
 548                         mode_t mode)
 549 {
 550         uint32_t access_granted = 0;
 551         struct security_descriptor *pdesc = NULL;
 552         bool file_existed = true;
 553         char *fname = NULL;
 554         NTSTATUS status;
 555
 556         if (fsp->base_fsp) {
 557                 /* Stream open. Base filename open already did the ACL check. */
 558                 DEBUG(10,("open_acl_common: stream open on %s\n",
 559                         smb_fname_str_dbg(smb_fname) ));
 560                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 561         }
 562
 563         status = get_full_smb_filename(talloc_tos(), smb_fname,
 564                                        &fname);
 565         if (!NT_STATUS_IS_OK(status)) {
 566                 goto err;
 567         }
 568
 569         status = get_nt_acl_internal(handle,
 570                                 NULL,
 571                                 fname,
 572                                 (OWNER_SECURITY_INFORMATION |
 573                                  GROUP_SECURITY_INFORMATION |
 574                                  DACL_SECURITY_INFORMATION),
 575                                 &pdesc);
 576         if (NT_STATUS_IS_OK(status)) {
 577                 /* See if we can access it. */
 578                 status = smb1_file_se_access_check(pdesc,
 579                                         handle->conn->server_info->ptok,
 580                                         fsp->access_mask,
 581                                         &access_granted);
 582                 if (!NT_STATUS_IS_OK(status)) {
 583                         DEBUG(10,("open_acl_xattr: file %s open "
 584                                 "refused with error %s\n",
 585                                 smb_fname_str_dbg(smb_fname),
 586                                 nt_errstr(status) ));
 587                         goto err;
 588                 }
 589         } else if (NT_STATUS_EQUAL(status,NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 590                 file_existed = false;
 591                 /*
 592                  * If O_CREAT is true then we're trying to create a file.
 593                  * Check the parent directory ACL will allow this.
 594                  */
 595                 if (flags & O_CREAT) {
 596                         status = check_parent_acl_common(handle, fname,
 597                                         SEC_DIR_ADD_FILE);
 598                         if (!NT_STATUS_IS_OK(status)) {
 599                                 goto err;
 600                         }
 601                 }
 602         }
 603
 604         DEBUG(10,("open_acl_xattr: get_nt_acl_attr_internal for "
 605                 "file %s returned %s\n",
 606                 smb_fname_str_dbg(smb_fname),
 607                 nt_errstr(status) ));
 608
 609         fsp->fh->fd = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 610
 611         if (!file_existed && fsp->fh->fd != -1) {
 612                 /* File was created. Inherit from parent directory. */
 613                 status = fsp_set_smb_fname(fsp, smb_fname);
 614                 if (!NT_STATUS_IS_OK(status)) {
 615                         goto err;
 616                 }
 617                 inherit_new_acl(handle, smb_fname, fsp, false);
 618         }
 619
 620         return fsp->fh->fd;
 621
 622   err:
 623
 624         errno = map_errno_from_nt_status(status);
 625         return -1;
 626 }
 627
 628 static int mkdir_acl_common(vfs_handle_struct *handle, const char *path, mode_t mode)
 629 {
 630         struct smb_filename *smb_fname = NULL;
 631         int ret;
 632         NTSTATUS status;
 633         SMB_STRUCT_STAT sbuf;
 634
 635         ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
 636         if (ret == -1 && errno == ENOENT) {
 637                 /* We're creating a new directory. */
 638                 status = check_parent_acl_common(handle, path,
 639                                 SEC_DIR_ADD_SUBDIR);
 640                 if (!NT_STATUS_IS_OK(status)) {
 641                         errno = map_errno_from_nt_status(status);
 642                         return -1;
 643                 }
 644         }
 645
 646         ret = SMB_VFS_NEXT_MKDIR(handle, path, mode);
 647         if (ret == -1) {
 648                 return ret;
 649         }
 650
 651         status = create_synthetic_smb_fname(talloc_tos(), path, NULL, NULL,
 652                                             &smb_fname);
 653         if (!NT_STATUS_IS_OK(status)) {
 654                 errno = map_errno_from_nt_status(status);
 655                 return -1;
 656         }
 657
 658         /* New directory - inherit from parent. */
 659         inherit_new_acl(handle, smb_fname, NULL, true);
 660         TALLOC_FREE(smb_fname);
 661         return ret;
 662 }
 663
 664 /*********************************************************************
 665  Fetch a security descriptor given an fsp.
 666 *********************************************************************/
 667
 668 static NTSTATUS fget_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
 669         uint32_t security_info, struct security_descriptor **ppdesc)
 670 {
 671         return get_nt_acl_internal(handle, fsp,
 672                                 NULL, security_info, ppdesc);
 673 }
 674
 675 /*********************************************************************
 676  Fetch a security descriptor given a pathname.
 677 *********************************************************************/
 678
 679 static NTSTATUS get_nt_acl_common(vfs_handle_struct *handle,
 680         const char *name, uint32_t security_info, struct security_descriptor **ppdesc)
 681 {
 682         return get_nt_acl_internal(handle, NULL,
 683                                 name, security_info, ppdesc);
 684 }
 685
 686 /*********************************************************************
 687  Store a security descriptor given an fsp.
 688 *********************************************************************/
 689
 690 static NTSTATUS fset_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
 691         uint32_t security_info_sent, const struct security_descriptor *psd)
 692 {
 693         NTSTATUS status;
 694         DATA_BLOB blob;
 695         struct security_descriptor *pdesc_next = NULL;
 696         uint8_t hash[XATTR_SD_HASH_SIZE];
 697
 698         if (DEBUGLEVEL >= 10) {
 699                 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
 700                           fsp_str_dbg(fsp)));
 701                 NDR_PRINT_DEBUG(security_descriptor,
 702                         CONST_DISCARD(struct security_descriptor *,psd));
 703         }
 704
 705         /* Ensure we have OWNER/GROUP/DACL set. */
 706
 707         if ((security_info_sent & (OWNER_SECURITY_INFORMATION|
 708                                 GROUP_SECURITY_INFORMATION|
 709                                 DACL_SECURITY_INFORMATION)) !=
 710                                 (OWNER_SECURITY_INFORMATION|
 711                                  GROUP_SECURITY_INFORMATION|
 712                                  DACL_SECURITY_INFORMATION)) {
 713                 /* No we don't - read from the existing SD. */
 714                 struct security_descriptor *nc_psd = NULL;
 715
 716                 status = get_nt_acl_internal(handle, fsp,
 717                                 NULL,
 718                                 (OWNER_SECURITY_INFORMATION|
 719                                  GROUP_SECURITY_INFORMATION|
 720                                  DACL_SECURITY_INFORMATION),
 721                                 &nc_psd);
 722
 723                 if (!NT_STATUS_IS_OK(status)) {
 724                         return status;
 725                 }
 726
 727                 /* This is safe as nc_psd is discarded at fn exit. */
 728                 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
 729                         nc_psd->owner_sid = psd->owner_sid;
 730                 }
 731                 security_info_sent |= OWNER_SECURITY_INFORMATION;
 732
 733                 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
 734                         nc_psd->group_sid = psd->group_sid;
 735                 }
 736                 security_info_sent |= GROUP_SECURITY_INFORMATION;
 737
 738                 if (security_info_sent & DACL_SECURITY_INFORMATION) {
 739                         nc_psd->dacl = dup_sec_acl(talloc_tos(), psd->dacl);
 740                         if (nc_psd->dacl == NULL) {
 741                                 return NT_STATUS_NO_MEMORY;
 742                         }
 743                 }
 744                 security_info_sent |= DACL_SECURITY_INFORMATION;
 745                 psd = nc_psd;
 746         }
 747
 748         status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 749         if (!NT_STATUS_IS_OK(status)) {
 750                 return status;
 751         }
 752
 753         /* Get the full underlying sd, then hash. */
 754         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 755                                 fsp,
 756                                 HASH_SECURITY_INFO,
 757                                 &pdesc_next);
 758
 759         if (!NT_STATUS_IS_OK(status)) {
 760                 return status;
 761         }
 762
 763         status = hash_sd_sha256(pdesc_next, hash);
 764         if (!NT_STATUS_IS_OK(status)) {
 765                 return status;
 766         }
 767
 768         if (DEBUGLEVEL >= 10) {
 769                 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
 770                           fsp_str_dbg(fsp)));
 771                 NDR_PRINT_DEBUG(security_descriptor,
 772                         CONST_DISCARD(struct security_descriptor *,psd));
 773         }
 774         create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
 775         store_acl_blob_fsp(handle, fsp, &blob);
 776
 777         return NT_STATUS_OK;
 778 }
 779
 780 static SMB_STRUCT_DIR *opendir_acl_common(vfs_handle_struct *handle,
 781                         const char *fname, const char *mask, uint32 attr)
 782 {
 783         NTSTATUS status = check_parent_acl_common(handle, fname, SEC_DIR_LIST);
 784
 785         if (!NT_STATUS_IS_OK(status)) {
 786                 errno = map_errno_from_nt_status(status);
 787                 return NULL;
 788         }
 789         return SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);
 790 }