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  Pull a DATA_BLOB from an xattr given a pathname.
 165  DOES NOT FALL BACK TO THE UNDERLYING ACLs ON THE FILESYSTEM.
 166 *******************************************************************/
 167
 168 static NTSTATUS get_nt_acl_internal(vfs_handle_struct *handle,
 169                                 files_struct *fsp,
 170                                 const char *name,
 171                                 uint32_t security_info,
 172                                 struct security_descriptor **ppdesc)
 173 {
 174         DATA_BLOB blob;
 175         NTSTATUS status;
 176         uint16_t hash_type;
 177         uint8_t hash[XATTR_SD_HASH_SIZE];
 178         uint8_t hash_tmp[XATTR_SD_HASH_SIZE];
 179         struct security_descriptor *pdesc_next = NULL;
 180
 181         if (fsp && name == NULL) {
 182                 name = fsp->fsp_name->base_name;
 183         }
 184
 185         DEBUG(10, ("get_nt_acl_internal: name=%s\n", name));
 186
 187         status = get_acl_blob(talloc_tos(), handle, fsp, name, &blob);
 188         if (!NT_STATUS_IS_OK(status)) {
 189                 DEBUG(10, ("get_nt_acl_internal: get_acl_blob returned %s\n",
 190                         nt_errstr(status)));
 191                 return status;
 192         }
 193
 194         status = parse_acl_blob(&blob, ppdesc,
 195                                 &hash_type, &hash[0]);
 196         if (!NT_STATUS_IS_OK(status)) {
 197                 DEBUG(10, ("parse_acl_blob returned %s\n",
 198                                 nt_errstr(status)));
 199                 return status;
 200         }
 201
 202         /* Ensure the hash type is one we know. */
 203         switch (hash_type) {
 204                 case XATTR_SD_HASH_TYPE_NONE:
 205                         /* No hash, goto return blob sd. */
 206                         goto out;
 207                 case XATTR_SD_HASH_TYPE_SHA256:
 208                         break;
 209                 default:
 210                         return NT_STATUS_REVISION_MISMATCH;
 211         }
 212
 213         /* Get the full underlying sd, then hash. */
 214         if (fsp) {
 215                 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 216                                 fsp,
 217                                 HASH_SECURITY_INFO,
 218                                 &pdesc_next);
 219         } else {
 220                 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 221                                 name,
 222                                 HASH_SECURITY_INFO,
 223                                 &pdesc_next);
 224         }
 225
 226         if (!NT_STATUS_IS_OK(status)) {
 227                 goto out;
 228         }
 229
 230         status = hash_sd_sha256(pdesc_next, hash_tmp);
 231         if (!NT_STATUS_IS_OK(status)) {
 232                 goto out;
 233         }
 234
 235         if (memcmp(&hash[0], &hash_tmp[0], XATTR_SD_HASH_SIZE) == 0) {
 236                 TALLOC_FREE(pdesc_next);
 237                 /* Hash matches, return blob sd. */
 238                 goto out;
 239         }
 240
 241         /* Hash doesn't match, return underlying sd. */
 242
 243         if (!(security_info & OWNER_SECURITY_INFORMATION)) {
 244                 pdesc_next->owner_sid = NULL;
 245         }
 246         if (!(security_info & GROUP_SECURITY_INFORMATION)) {
 247                 pdesc_next->group_sid = NULL;
 248         }
 249         if (!(security_info & DACL_SECURITY_INFORMATION)) {
 250                 pdesc_next->dacl = NULL;
 251         }
 252         if (!(security_info & SACL_SECURITY_INFORMATION)) {
 253                 pdesc_next->sacl = NULL;
 254         }
 255
 256         TALLOC_FREE(*ppdesc);
 257         *ppdesc = pdesc_next;
 258
 259   out:
 260
 261         if (!(security_info & OWNER_SECURITY_INFORMATION)) {
 262                 (*ppdesc)->owner_sid = NULL;
 263         }
 264         if (!(security_info & GROUP_SECURITY_INFORMATION)) {
 265                 (*ppdesc)->group_sid = NULL;
 266         }
 267         if (!(security_info & DACL_SECURITY_INFORMATION)) {
 268                 (*ppdesc)->dacl = NULL;
 269         }
 270         if (!(security_info & SACL_SECURITY_INFORMATION)) {
 271                 (*ppdesc)->sacl = NULL;
 272         }
 273
 274         TALLOC_FREE(blob.data);
 275         return status;
 276 }
 277
 278 /*********************************************************************
 279  Create a default security descriptor for a file in case no inheritance
 280  exists. All permissions to the owner and SYSTEM.
 281 *********************************************************************/
 282
 283 static struct security_descriptor *default_file_sd(TALLOC_CTX *mem_ctx,
 284                                                 SMB_STRUCT_STAT *psbuf,
 285                                                 bool force_inherit)
 286 {
 287         struct dom_sid owner_sid, group_sid;
 288         size_t sd_size;
 289         struct security_ace *pace = NULL;
 290         struct security_acl *pacl = NULL;
 291
 292         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
 293         gid_to_sid(&group_sid, psbuf->st_ex_gid);
 294
 295         pace = TALLOC_ARRAY(mem_ctx, struct security_ace, 2);
 296         if (!pace) {
 297                 return NULL;
 298         }
 299
 300         /* If force_inherit is set, this means we are initializing the ACEs for
 301          * a container and we want the ACEs for owner_sid and "SYSTEM" to be
 302          * inheritable by their children (See Bug #6802).
 303          */
 304
 305         init_sec_ace(&pace[0], &owner_sid, SEC_ACE_TYPE_ACCESS_ALLOWED,
 306                         SEC_RIGHTS_FILE_ALL, (force_inherit ?
 307                                         (SEC_ACE_FLAG_OBJECT_INHERIT|
 308                                         SEC_ACE_FLAG_CONTAINER_INHERIT) :
 309                                         0));
 310
 311         init_sec_ace(&pace[1], &global_sid_System, SEC_ACE_TYPE_ACCESS_ALLOWED,
 312                         SEC_RIGHTS_FILE_ALL, (force_inherit ?
 313                                         (SEC_ACE_FLAG_OBJECT_INHERIT|
 314                                         SEC_ACE_FLAG_CONTAINER_INHERIT) :
 315                                         0));
 316
 317         pacl = make_sec_acl(mem_ctx,
 318                                 NT4_ACL_REVISION,
 319                                 2,
 320                                 pace);
 321         if (!pacl) {
 322                 return NULL;
 323         }
 324         return make_sec_desc(mem_ctx,
 325                         SECURITY_DESCRIPTOR_REVISION_1,
 326                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
 327                         &owner_sid,
 328                         &group_sid,
 329                         NULL,
 330                         pacl,
 331                         &sd_size);
 332 }
 333
 334 /*********************************************************************
 335 *********************************************************************/
 336
 337 static NTSTATUS inherit_new_acl(vfs_handle_struct *handle,
 338                                         struct smb_filename *smb_fname,
 339                                         files_struct *fsp,
 340                                         bool container)
 341 {
 342         TALLOC_CTX *ctx = talloc_tos();
 343         NTSTATUS status;
 344         struct security_descriptor *parent_desc = NULL;
 345         struct security_descriptor *psd = NULL;
 346         struct security_descriptor *pdesc_next = NULL;
 347         DATA_BLOB blob;
 348         size_t size;
 349         char *parent_name;
 350         bool force_inherit = false;
 351         uint8_t hash[XATTR_SD_HASH_SIZE];
 352
 353         if (!parent_dirname(ctx, smb_fname->base_name, &parent_name, NULL)) {
 354                 return NT_STATUS_NO_MEMORY;
 355         }
 356
 357         DEBUG(10,("inherit_new_acl: check directory %s\n",
 358                         parent_name));
 359
 360         status = get_nt_acl_internal(handle,
 361                                 NULL,
 362                                 parent_name,
 363                                 (OWNER_SECURITY_INFORMATION |
 364                                  GROUP_SECURITY_INFORMATION |
 365                                  DACL_SECURITY_INFORMATION),
 366                                 &parent_desc);
 367         if (NT_STATUS_IS_OK(status)) {
 368                 /* Create an inherited descriptor from the parent. */
 369
 370                 if (DEBUGLEVEL >= 10) {
 371                         DEBUG(10,("inherit_new_acl: parent acl is:\n"));
 372                         NDR_PRINT_DEBUG(security_descriptor, parent_desc);
 373                 }
 374
 375                 status = se_create_child_secdesc(ctx,
 376                                 &psd,
 377                                 &size,
 378                                 parent_desc,
 379                                 &handle->conn->server_info->ptok->user_sids[PRIMARY_USER_SID_INDEX],
 380                                 &handle->conn->server_info->ptok->user_sids[PRIMARY_GROUP_SID_INDEX],
 381                                 container);
 382                 if (!NT_STATUS_IS_OK(status)) {
 383                         return status;
 384                 }
 385
 386                 if (DEBUGLEVEL >= 10) {
 387                         DEBUG(10,("inherit_new_acl: child acl is:\n"));
 388                         NDR_PRINT_DEBUG(security_descriptor, psd);
 389                 }
 390
 391         } else {
 392                 DEBUG(10,("inherit_new_acl: directory %s failed "
 393                         "to get acl %s\n",
 394                         parent_name,
 395                         nt_errstr(status) ));
 396         }
 397
 398         if (!psd || psd->dacl == NULL) {
 399
 400                 TALLOC_FREE(psd);
 401                 if (fsp) {
 402                         status = vfs_stat_fsp(fsp);
 403                         smb_fname->st = fsp->fsp_name->st;
 404                 } else {
 405                         int ret;
 406                         if (lp_posix_pathnames()) {
 407                                 ret = SMB_VFS_LSTAT(handle->conn, smb_fname);
 408                         } else {
 409                                 ret = SMB_VFS_STAT(handle->conn, smb_fname);
 410                         }
 411                         if (ret == -1) {
 412                                 status = map_nt_error_from_unix(errno);
 413                         }
 414                 }
 415                 if (!NT_STATUS_IS_OK(status)) {
 416                         return status;
 417                 }
 418
 419                 /* If we get here, we could have the following possibilities:
 420                  *      1. No ACLs exist on the parent container.
 421                  *      2. ACLs exist on the parent container but they were
 422                  *      not inheritable.
 423                  *
 424                  *      Check to see if case #1 occurred.
 425                  *
 426                  */
 427                 if (container &&
 428                         (parent_desc == NULL || parent_desc->dacl == NULL)) {
 429
 430                         /* If no parent descriptor exists, then there were
 431                          * no ACLs on the parent and then we must create
 432                          * the ACLs on this newly created folder so that they
 433                          * will be inherited by their children (See Bug #6802).
 434                          */
 435
 436                         force_inherit = true;
 437                 }
 438
 439                 psd = default_file_sd(ctx, &smb_fname->st, force_inherit);
 440                 if (!psd) {
 441                         return NT_STATUS_NO_MEMORY;
 442                 }
 443
 444                 if (DEBUGLEVEL >= 10) {
 445                         DEBUG(10,("inherit_new_acl: default acl is:\n"));
 446                         NDR_PRINT_DEBUG(security_descriptor, psd);
 447                 }
 448         }
 449
 450         /* Object exists. Read the current SD to get the hash. */
 451         if (fsp) {
 452                 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 453                                 fsp,
 454                                 HASH_SECURITY_INFO,
 455                                 &pdesc_next);
 456         } else {
 457                 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 458                                 smb_fname->base_name,
 459                                 HASH_SECURITY_INFO,
 460                                 &pdesc_next);
 461         }
 462
 463         if (!NT_STATUS_IS_OK(status)) {
 464                 return status;
 465         }
 466
 467         status = hash_sd_sha256(pdesc_next, hash);
 468         if (!NT_STATUS_IS_OK(status)) {
 469                 return status;
 470         }
 471         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
 472         if (!NT_STATUS_IS_OK(status)) {
 473                 return status;
 474         }
 475         if (fsp) {
 476                 return store_acl_blob_fsp(handle, fsp, &blob);
 477         } else {
 478                 return store_acl_blob_pathname(handle, smb_fname->base_name,
 479                                                &blob);
 480         }
 481 }
 482
 483 static NTSTATUS check_parent_acl_common(vfs_handle_struct *handle,
 484                                 const char *path,
 485                                 uint32_t access_mask)
 486 {
 487         char *parent_name = NULL;
 488         struct security_descriptor *parent_desc = NULL;
 489         uint32_t access_granted = 0;
 490         NTSTATUS status;
 491
 492         if (!parent_dirname(talloc_tos(), path, &parent_name, NULL)) {
 493                 return NT_STATUS_NO_MEMORY;
 494         }
 495
 496         status = get_nt_acl_internal(handle,
 497                                         NULL,
 498                                         parent_name,
 499                                         (OWNER_SECURITY_INFORMATION |
 500                                          GROUP_SECURITY_INFORMATION |
 501                                          DACL_SECURITY_INFORMATION),
 502                                         &parent_desc);
 503
 504         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 505                 /* No Windows ACL stored as a blob. Let the
 506                  * underlying filesystem take care of checking
 507                  * permissions. */
 508                 DEBUG(10,("check_parent_acl_common: no Windows ACL blob "
 509                         "stored on directory %s for "
 510                         "path %s\n",
 511                         parent_name,
 512                         path ));
 513                 return NT_STATUS_OK;
 514         }
 515
 516         if (!NT_STATUS_IS_OK(status)) {
 517                 DEBUG(10,("check_parent_acl_common: get_nt_acl_internal "
 518                         "on directory %s for "
 519                         "path %s returned %s\n",
 520                         parent_name,
 521                         path,
 522                         nt_errstr(status) ));
 523                 return status;
 524         }
 525         status = smb1_file_se_access_check(parent_desc,
 526                                         handle->conn->server_info->ptok,
 527                                         access_mask,
 528                                         &access_granted);
 529         if(!NT_STATUS_IS_OK(status)) {
 530                 DEBUG(10,("check_parent_acl_common: access check "
 531                         "on directory %s for "
 532                         "path %s for mask 0x%x returned %s\n",
 533                         parent_name,
 534                         path,
 535                         access_mask,
 536                         nt_errstr(status) ));
 537                 return status;
 538         }
 539         return NT_STATUS_OK;
 540 }
 541
 542 /*********************************************************************
 543  Check ACL on open. For new files inherit from parent directory.
 544 *********************************************************************/
 545
 546 static int open_acl_common(vfs_handle_struct *handle,
 547                         struct smb_filename *smb_fname,
 548                         files_struct *fsp,
 549                         int flags,
 550                         mode_t mode)
 551 {
 552         uint32_t access_granted = 0;
 553         struct security_descriptor *pdesc = NULL;
 554         bool file_existed = true;
 555         char *fname = NULL;
 556         NTSTATUS status;
 557
 558         if (fsp->base_fsp) {
 559                 /* Stream open. Base filename open already did the ACL check. */
 560                 DEBUG(10,("open_acl_common: stream open on %s\n",
 561                         smb_fname_str_dbg(smb_fname) ));
 562                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 563         }
 564
 565         status = get_full_smb_filename(talloc_tos(), smb_fname,
 566                                        &fname);
 567         if (!NT_STATUS_IS_OK(status)) {
 568                 goto err;
 569         }
 570
 571         status = get_nt_acl_internal(handle,
 572                                 NULL,
 573                                 fname,
 574                                 (OWNER_SECURITY_INFORMATION |
 575                                  GROUP_SECURITY_INFORMATION |
 576                                  DACL_SECURITY_INFORMATION),
 577                                 &pdesc);
 578         if (NT_STATUS_IS_OK(status)) {
 579                 /* See if we can access it. */
 580                 status = smb1_file_se_access_check(pdesc,
 581                                         handle->conn->server_info->ptok,
 582                                         fsp->access_mask,
 583                                         &access_granted);
 584                 if (!NT_STATUS_IS_OK(status)) {
 585                         DEBUG(10,("open_acl_xattr: file %s open "
 586                                 "refused with error %s\n",
 587                                 smb_fname_str_dbg(smb_fname),
 588                                 nt_errstr(status) ));
 589                         goto err;
 590                 }
 591         } else if (NT_STATUS_EQUAL(status,NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 592                 file_existed = false;
 593                 /*
 594                  * If O_CREAT is true then we're trying to create a file.
 595                  * Check the parent directory ACL will allow this.
 596                  */
 597                 if (flags & O_CREAT) {
 598                         status = check_parent_acl_common(handle, fname,
 599                                         SEC_DIR_ADD_FILE);
 600                         if (!NT_STATUS_IS_OK(status)) {
 601                                 goto err;
 602                         }
 603                 }
 604         }
 605
 606         DEBUG(10,("open_acl_xattr: get_nt_acl_attr_internal for "
 607                 "file %s returned %s\n",
 608                 smb_fname_str_dbg(smb_fname),
 609                 nt_errstr(status) ));
 610
 611         fsp->fh->fd = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 612
 613         if (!file_existed && fsp->fh->fd != -1) {
 614                 /* File was created. Inherit from parent directory. */
 615                 status = fsp_set_smb_fname(fsp, smb_fname);
 616                 if (!NT_STATUS_IS_OK(status)) {
 617                         goto err;
 618                 }
 619                 inherit_new_acl(handle, smb_fname, fsp, false);
 620         }
 621
 622         return fsp->fh->fd;
 623
 624   err:
 625
 626         errno = map_errno_from_nt_status(status);
 627         return -1;
 628 }
 629
 630 static int mkdir_acl_common(vfs_handle_struct *handle, const char *path, mode_t mode)
 631 {
 632         struct smb_filename *smb_fname = NULL;
 633         int ret;
 634         NTSTATUS status;
 635         SMB_STRUCT_STAT sbuf;
 636
 637         ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
 638         if (ret == -1 && errno == ENOENT) {
 639                 /* We're creating a new directory. */
 640                 status = check_parent_acl_common(handle, path,
 641                                 SEC_DIR_ADD_SUBDIR);
 642                 if (!NT_STATUS_IS_OK(status)) {
 643                         errno = map_errno_from_nt_status(status);
 644                         return -1;
 645                 }
 646         }
 647
 648         ret = SMB_VFS_NEXT_MKDIR(handle, path, mode);
 649         if (ret == -1) {
 650                 return ret;
 651         }
 652
 653         status = create_synthetic_smb_fname(talloc_tos(), path, NULL, NULL,
 654                                             &smb_fname);
 655         if (!NT_STATUS_IS_OK(status)) {
 656                 errno = map_errno_from_nt_status(status);
 657                 return -1;
 658         }
 659
 660         /* New directory - inherit from parent. */
 661         inherit_new_acl(handle, smb_fname, NULL, true);
 662         TALLOC_FREE(smb_fname);
 663         return ret;
 664 }
 665
 666 /*********************************************************************
 667  Fetch a security descriptor given an fsp.
 668 *********************************************************************/
 669
 670 static NTSTATUS fget_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
 671         uint32_t security_info, struct security_descriptor **ppdesc)
 672 {
 673         NTSTATUS status = get_nt_acl_internal(handle, fsp,
 674                                 NULL, security_info, ppdesc);
 675         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 676                 /* Pull the ACL from the underlying system. */
 677                 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 678                                                 fsp,
 679                                                 security_info,
 680                                                 ppdesc);
 681         }
 682         return status;
 683 }
 684
 685 /*********************************************************************
 686  Fetch a security descriptor given a pathname.
 687 *********************************************************************/
 688
 689 static NTSTATUS get_nt_acl_common(vfs_handle_struct *handle,
 690         const char *name, uint32_t security_info, struct security_descriptor **ppdesc)
 691 {
 692         NTSTATUS status = get_nt_acl_internal(handle, NULL,
 693                                 name, security_info, ppdesc);
 694         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 695                 /* Pull the ACL from the underlying system. */
 696                 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 697                                                 name,
 698                                                 security_info,
 699                                                 ppdesc);
 700         }
 701         return status;
 702 }
 703
 704 /*********************************************************************
 705  Store a security descriptor given an fsp.
 706 *********************************************************************/
 707
 708 static NTSTATUS fset_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
 709         uint32_t security_info_sent, const struct security_descriptor *psd)
 710 {
 711         NTSTATUS status;
 712         DATA_BLOB blob;
 713         struct security_descriptor *pdesc_next = NULL;
 714         uint8_t hash[XATTR_SD_HASH_SIZE];
 715
 716         if (DEBUGLEVEL >= 10) {
 717                 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
 718                           fsp_str_dbg(fsp)));
 719                 NDR_PRINT_DEBUG(security_descriptor,
 720                         CONST_DISCARD(struct security_descriptor *,psd));
 721         }
 722
 723         /* Ensure we have OWNER/GROUP/DACL set. */
 724
 725         if ((security_info_sent & (OWNER_SECURITY_INFORMATION|
 726                                 GROUP_SECURITY_INFORMATION|
 727                                 DACL_SECURITY_INFORMATION)) !=
 728                                 (OWNER_SECURITY_INFORMATION|
 729                                  GROUP_SECURITY_INFORMATION|
 730                                  DACL_SECURITY_INFORMATION)) {
 731                 /* No we don't - read from the existing SD. */
 732                 struct security_descriptor *nc_psd = NULL;
 733
 734                 status = get_nt_acl_internal(handle, fsp,
 735                                 NULL,
 736                                 (OWNER_SECURITY_INFORMATION|
 737                                  GROUP_SECURITY_INFORMATION|
 738                                  DACL_SECURITY_INFORMATION),
 739                                 &nc_psd);
 740
 741                 if (!NT_STATUS_IS_OK(status)) {
 742                         return status;
 743                 }
 744
 745                 /* This is safe as nc_psd is discarded at fn exit. */
 746                 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
 747                         nc_psd->owner_sid = psd->owner_sid;
 748                 }
 749                 security_info_sent |= OWNER_SECURITY_INFORMATION;
 750
 751                 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
 752                         nc_psd->group_sid = psd->group_sid;
 753                 }
 754                 security_info_sent |= GROUP_SECURITY_INFORMATION;
 755
 756                 if (security_info_sent & DACL_SECURITY_INFORMATION) {
 757                         nc_psd->dacl = dup_sec_acl(talloc_tos(), psd->dacl);
 758                         if (nc_psd->dacl == NULL) {
 759                                 return NT_STATUS_NO_MEMORY;
 760                         }
 761                 }
 762                 security_info_sent |= DACL_SECURITY_INFORMATION;
 763                 psd = nc_psd;
 764         }
 765
 766         status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 767         if (!NT_STATUS_IS_OK(status)) {
 768                 return status;
 769         }
 770
 771         /* Get the full underlying sd, then hash. */
 772         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 773                                 fsp,
 774                                 HASH_SECURITY_INFO,
 775                                 &pdesc_next);
 776
 777         if (!NT_STATUS_IS_OK(status)) {
 778                 return status;
 779         }
 780
 781         status = hash_sd_sha256(pdesc_next, hash);
 782         if (!NT_STATUS_IS_OK(status)) {
 783                 return status;
 784         }
 785
 786         if (DEBUGLEVEL >= 10) {
 787                 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
 788                           fsp_str_dbg(fsp)));
 789                 NDR_PRINT_DEBUG(security_descriptor,
 790                         CONST_DISCARD(struct security_descriptor *,psd));
 791         }
 792         create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
 793         store_acl_blob_fsp(handle, fsp, &blob);
 794
 795         return NT_STATUS_OK;
 796 }
 797
 798 static SMB_STRUCT_DIR *opendir_acl_common(vfs_handle_struct *handle,
 799                         const char *fname, const char *mask, uint32 attr)
 800 {
 801         NTSTATUS status = check_parent_acl_common(handle, fname, SEC_DIR_LIST);
 802
 803         if (!NT_STATUS_IS_OK(status)) {
 804                 errno = map_errno_from_nt_status(status);
 805                 return NULL;
 806         }
 807         return SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);
 808 }