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 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
  31                         DATA_BLOB *pblob,
  32                         uint8_t hash[16]);
  33
  34 #define HASH_SECURITY_INFO (OWNER_SECURITY_INFORMATION | \
  35                                 GROUP_SECURITY_INFORMATION | \
  36                                 DACL_SECURITY_INFORMATION | \
  37                                 SACL_SECURITY_INFORMATION)
  38
  39 /*******************************************************************
  40  Hash a security descriptor.
  41 *******************************************************************/
  42
  43 static NTSTATUS hash_sd(struct security_descriptor *psd,
  44                         uint8_t hash[16])
  45 {
  46         DATA_BLOB blob;
  47         struct MD5Context tctx;
  48         NTSTATUS status;
  49
  50         memset(hash, '\0', 16);
  51         status = create_acl_blob(psd, &blob, hash);
  52         if (!NT_STATUS_IS_OK(status)) {
  53                 return status;
  54         }
  55         MD5Init(&tctx);
  56         MD5Update(&tctx, blob.data, blob.length);
  57         MD5Final(hash, &tctx);
  58         return NT_STATUS_OK;
  59 }
  60
  61 /*******************************************************************
  62  Parse out a struct security_descriptor from a DATA_BLOB.
  63 *******************************************************************/
  64
  65 static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
  66                                 uint32 security_info,
  67                                 struct security_descriptor **ppdesc,
  68                                 uint8_t hash[16])
  69 {
  70         TALLOC_CTX *ctx = talloc_tos();
  71         struct xattr_NTACL xacl;
  72         enum ndr_err_code ndr_err;
  73         size_t sd_size;
  74
  75         ndr_err = ndr_pull_struct_blob(pblob, ctx, NULL, &xacl,
  76                         (ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
  77
  78         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  79                 DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
  80                         ndr_errstr(ndr_err)));
  81                 return ndr_map_error2ntstatus(ndr_err);;
  82         }
  83
  84         if (xacl.version != 2) {
  85                 return NT_STATUS_REVISION_MISMATCH;
  86         }
  87
  88         *ppdesc = make_sec_desc(ctx, SEC_DESC_REVISION, xacl.info.sd_hs->sd->type | SEC_DESC_SELF_RELATIVE,
  89                         (security_info & OWNER_SECURITY_INFORMATION)
  90                         ? xacl.info.sd_hs->sd->owner_sid : NULL,
  91                         (security_info & GROUP_SECURITY_INFORMATION)
  92                         ? xacl.info.sd_hs->sd->group_sid : NULL,
  93                         (security_info & SACL_SECURITY_INFORMATION)
  94                         ? xacl.info.sd_hs->sd->sacl : NULL,
  95                         (security_info & DACL_SECURITY_INFORMATION)
  96                         ? xacl.info.sd_hs->sd->dacl : NULL,
  97                         &sd_size);
  98
  99         memcpy(hash, xacl.info.sd_hs->hash, 16);
 100         TALLOC_FREE(xacl.info.sd);
 101
 102         return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
 103 }
 104
 105 /*******************************************************************
 106  Pull a security descriptor into a DATA_BLOB from a xattr.
 107 *******************************************************************/
 108
 109 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
 110                         vfs_handle_struct *handle,
 111                         files_struct *fsp,
 112                         const char *name,
 113                         DATA_BLOB *pblob)
 114 {
 115         size_t size = 1024;
 116         uint8_t *val = NULL;
 117         uint8_t *tmp;
 118         ssize_t sizeret;
 119         int saved_errno = 0;
 120
 121         ZERO_STRUCTP(pblob);
 122
 123   again:
 124
 125         tmp = TALLOC_REALLOC_ARRAY(ctx, val, uint8_t, size);
 126         if (tmp == NULL) {
 127                 TALLOC_FREE(val);
 128                 return NT_STATUS_NO_MEMORY;
 129         }
 130         val = tmp;
 131
 132         become_root();
 133         if (fsp && fsp->fh->fd != -1) {
 134                 sizeret = SMB_VFS_FGETXATTR(fsp, XATTR_NTACL_NAME, val, size);
 135         } else {
 136                 sizeret = SMB_VFS_GETXATTR(handle->conn, name,
 137                                         XATTR_NTACL_NAME, val, size);
 138         }
 139         if (sizeret == -1) {
 140                 saved_errno = errno;
 141         }
 142         unbecome_root();
 143
 144         /* Max ACL size is 65536 bytes. */
 145         if (sizeret == -1) {
 146                 errno = saved_errno;
 147                 if ((errno == ERANGE) && (size != 65536)) {
 148                         /* Too small, try again. */
 149                         size = 65536;
 150                         goto again;
 151                 }
 152
 153                 /* Real error - exit here. */
 154                 TALLOC_FREE(val);
 155                 return map_nt_error_from_unix(errno);
 156         }
 157
 158         pblob->data = val;
 159         pblob->length = sizeret;
 160         return NT_STATUS_OK;
 161 }
 162
 163 /*******************************************************************
 164  Create a DATA_BLOB from a security descriptor.
 165 *******************************************************************/
 166
 167 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
 168                         DATA_BLOB *pblob,
 169                         uint8_t hash[16])
 170 {
 171         struct xattr_NTACL xacl;
 172         struct security_descriptor_hash sd_hs;
 173         enum ndr_err_code ndr_err;
 174         TALLOC_CTX *ctx = talloc_tos();
 175
 176         ZERO_STRUCT(xacl);
 177         ZERO_STRUCT(sd_hs);
 178
 179         xacl.version = 2;
 180         xacl.info.sd_hs = &sd_hs;
 181         xacl.info.sd_hs->sd = CONST_DISCARD(struct security_descriptor *, psd);
 182         memcpy(&xacl.info.sd_hs->hash[0], hash, 16);
 183
 184         ndr_err = ndr_push_struct_blob(
 185                         pblob, ctx, NULL, &xacl,
 186                         (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
 187
 188         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 189                 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
 190                         ndr_errstr(ndr_err)));
 191                 return ndr_map_error2ntstatus(ndr_err);;
 192         }
 193
 194         return NT_STATUS_OK;
 195 }
 196
 197 /*******************************************************************
 198  Store a DATA_BLOB into an xattr given an fsp pointer.
 199 *******************************************************************/
 200
 201 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
 202                                 files_struct *fsp,
 203                                 DATA_BLOB *pblob)
 204 {
 205         int ret;
 206         int saved_errno = 0;
 207
 208         DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
 209                   (unsigned int)pblob->length, fsp_str_dbg(fsp)));
 210
 211         become_root();
 212         if (fsp->fh->fd != -1) {
 213                 ret = SMB_VFS_FSETXATTR(fsp, XATTR_NTACL_NAME,
 214                         pblob->data, pblob->length, 0);
 215         } else {
 216                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
 217                                 XATTR_NTACL_NAME,
 218                                 pblob->data, pblob->length, 0);
 219         }
 220         if (ret) {
 221                 saved_errno = errno;
 222         }
 223         unbecome_root();
 224         if (ret) {
 225                 errno = saved_errno;
 226                 DEBUG(5, ("store_acl_blob_fsp: setting attr failed for file %s"
 227                         "with error %s\n",
 228                         fsp_str_dbg(fsp),
 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 store_acl_blob_pathname(vfs_handle_struct *handle,
 240                                         const char *fname,
 241                                         DATA_BLOB *pblob)
 242 {
 243         connection_struct *conn = handle->conn;
 244         int ret;
 245         int saved_errno = 0;
 246
 247         DEBUG(10,("store_acl_blob_pathname: storing blob "
 248                         "length %u on file %s\n",
 249                         (unsigned int)pblob->length, fname));
 250
 251         become_root();
 252         ret = SMB_VFS_SETXATTR(conn, fname,
 253                                 XATTR_NTACL_NAME,
 254                                 pblob->data, pblob->length, 0);
 255         if (ret) {
 256                 saved_errno = errno;
 257         }
 258         unbecome_root();
 259         if (ret) {
 260                 errno = saved_errno;
 261                 DEBUG(5, ("store_acl_blob_pathname: setting attr failed "
 262                         "for file %s with error %s\n",
 263                         fname,
 264                         strerror(errno) ));
 265                 return map_nt_error_from_unix(errno);
 266         }
 267         return NT_STATUS_OK;
 268 }
 269
 270 /*******************************************************************
 271  Store a DATA_BLOB into an xattr given a pathname.
 272 *******************************************************************/
 273
 274 static NTSTATUS get_nt_acl_xattr_internal(vfs_handle_struct *handle,
 275                                         files_struct *fsp,
 276                                         const char *name,
 277                                         uint32 security_info,
 278                                         struct security_descriptor **ppdesc)
 279 {
 280         DATA_BLOB blob;
 281         NTSTATUS status;
 282         uint8_t hash[16];
 283         uint8_t hash_tmp[16];
 284         struct security_descriptor *pdesc_next = NULL;
 285
 286         if (fsp && name == NULL) {
 287                 name = fsp->fsp_name->base_name;
 288         }
 289
 290         DEBUG(10, ("get_nt_acl_xattr_internal: name=%s\n", name));
 291
 292         status = get_acl_blob(talloc_tos(), handle, fsp, name, &blob);
 293         if (!NT_STATUS_IS_OK(status)) {
 294                 DEBUG(10, ("get_acl_blob returned %s\n", nt_errstr(status)));
 295                 return status;
 296         }
 297
 298         status = parse_acl_blob(&blob, security_info, ppdesc, &hash[0]);
 299         if (!NT_STATUS_IS_OK(status)) {
 300                 DEBUG(10, ("parse_acl_blob returned %s\n",
 301                                 nt_errstr(status)));
 302                 return status;
 303         }
 304
 305         /* If there was no stored hash, don't check. */
 306         memset(&hash_tmp[0], '\0', 16);
 307         if (memcmp(&hash[0], &hash_tmp[0], 16) == 0) {
 308                 /* No hash, goto return blob sd. */
 309                 goto out;
 310         }
 311
 312         /* Get the full underlying sd, then hash. */
 313         if (fsp) {
 314                 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 315                                 fsp,
 316                                 HASH_SECURITY_INFO,
 317                                 &pdesc_next);
 318         } else {
 319                 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 320                                 name,
 321                                 HASH_SECURITY_INFO,
 322                                 &pdesc_next);
 323         }
 324
 325         if (!NT_STATUS_IS_OK(status)) {
 326                 goto out;
 327         }
 328
 329         status = hash_sd(pdesc_next, hash_tmp);
 330         if (!NT_STATUS_IS_OK(status)) {
 331                 goto out;
 332         }
 333
 334         if (memcmp(&hash[0], &hash_tmp[0], 16) == 0) {
 335                 TALLOC_FREE(pdesc_next);
 336                 /* Hash matches, return blob sd. */
 337                 goto out;
 338         }
 339
 340         /* Hash doesn't match, return underlying sd. */
 341
 342         if (!(security_info & OWNER_SECURITY_INFORMATION)) {
 343                 pdesc_next->owner_sid = NULL;
 344         }
 345         if (!(security_info & GROUP_SECURITY_INFORMATION)) {
 346                 pdesc_next->group_sid = NULL;
 347         }
 348         if (!(security_info & DACL_SECURITY_INFORMATION)) {
 349                 pdesc_next->dacl = NULL;
 350         }
 351         if (!(security_info & SACL_SECURITY_INFORMATION)) {
 352                 pdesc_next->sacl = NULL;
 353         }
 354
 355         TALLOC_FREE(*ppdesc);
 356         *ppdesc = pdesc_next;
 357
 358   out:
 359
 360         TALLOC_FREE(blob.data);
 361         return status;
 362 }
 363
 364 /*********************************************************************
 365  Create a default security descriptor for a file in case no inheritance
 366  exists. All permissions to the owner and SYSTEM.
 367 *********************************************************************/
 368
 369 static struct security_descriptor *default_file_sd(TALLOC_CTX *mem_ctx,
 370                                                 SMB_STRUCT_STAT *psbuf)
 371 {
 372         struct dom_sid owner_sid, group_sid;
 373         size_t sd_size;
 374         struct security_ace *pace = NULL;
 375         struct security_acl *pacl = NULL;
 376
 377         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
 378         gid_to_sid(&group_sid, psbuf->st_ex_gid);
 379
 380         pace = TALLOC_ARRAY(mem_ctx, struct security_ace, 2);
 381         if (!pace) {
 382                 return NULL;
 383         }
 384
 385         init_sec_ace(&pace[0], &owner_sid, SEC_ACE_TYPE_ACCESS_ALLOWED,
 386                         SEC_RIGHTS_FILE_ALL, 0);
 387         init_sec_ace(&pace[1], &global_sid_System, SEC_ACE_TYPE_ACCESS_ALLOWED,
 388                         SEC_RIGHTS_FILE_ALL, 0);
 389
 390         pacl = make_sec_acl(mem_ctx,
 391                                 NT4_ACL_REVISION,
 392                                 2,
 393                                 pace);
 394         if (!pacl) {
 395                 return NULL;
 396         }
 397         return make_sec_desc(mem_ctx,
 398                         SECURITY_DESCRIPTOR_REVISION_1,
 399                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
 400                         &owner_sid,
 401                         &group_sid,
 402                         NULL,
 403                         pacl,
 404                         &sd_size);
 405 }
 406
 407 /*********************************************************************
 408 *********************************************************************/
 409
 410 static NTSTATUS inherit_new_acl(vfs_handle_struct *handle,
 411                                         struct smb_filename *smb_fname,
 412                                         files_struct *fsp,
 413                                         bool container)
 414 {
 415         TALLOC_CTX *ctx = talloc_tos();
 416         NTSTATUS status;
 417         struct security_descriptor *parent_desc = NULL;
 418         struct security_descriptor *psd = NULL;
 419         struct security_descriptor *pdesc_next = NULL;
 420         DATA_BLOB blob;
 421         size_t size;
 422         char *parent_name;
 423         uint8_t hash[16];
 424
 425         if (!parent_dirname(ctx, smb_fname->base_name, &parent_name, NULL)) {
 426                 return NT_STATUS_NO_MEMORY;
 427         }
 428
 429         DEBUG(10,("inherit_new_acl: check directory %s\n",
 430                         parent_name));
 431
 432         status = get_nt_acl_xattr_internal(handle,
 433                                         NULL,
 434                                         parent_name,
 435                                         (OWNER_SECURITY_INFORMATION |
 436                                          GROUP_SECURITY_INFORMATION |
 437                                          DACL_SECURITY_INFORMATION),
 438                                         &parent_desc);
 439         if (NT_STATUS_IS_OK(status)) {
 440                 /* Create an inherited descriptor from the parent. */
 441
 442                 if (DEBUGLEVEL >= 10) {
 443                         DEBUG(10,("inherit_new_acl: parent acl is:\n"));
 444                         NDR_PRINT_DEBUG(security_descriptor, parent_desc);
 445                 }
 446
 447                 status = se_create_child_secdesc(ctx,
 448                                 &psd,
 449                                 &size,
 450                                 parent_desc,
 451                                 &handle->conn->server_info->ptok->user_sids[PRIMARY_USER_SID_INDEX],
 452                                 &handle->conn->server_info->ptok->user_sids[PRIMARY_GROUP_SID_INDEX],
 453                                 container);
 454                 if (!NT_STATUS_IS_OK(status)) {
 455                         return status;
 456                 }
 457
 458                 if (DEBUGLEVEL >= 10) {
 459                         DEBUG(10,("inherit_new_acl: child acl is:\n"));
 460                         NDR_PRINT_DEBUG(security_descriptor, psd);
 461                 }
 462
 463         } else {
 464                 DEBUG(10,("inherit_new_acl: directory %s failed "
 465                         "to get acl %s\n",
 466                         parent_name,
 467                         nt_errstr(status) ));
 468         }
 469
 470         if (!psd || psd->dacl == NULL) {
 471                 int ret;
 472
 473                 TALLOC_FREE(psd);
 474                 if (fsp && !fsp->is_directory && fsp->fh->fd != -1) {
 475                         ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
 476                 } else {
 477                         if (fsp && fsp->posix_open) {
 478                                 ret = SMB_VFS_LSTAT(handle->conn, smb_fname);
 479                         } else {
 480                                 ret = SMB_VFS_STAT(handle->conn, smb_fname);
 481                         }
 482                 }
 483                 if (ret == -1) {
 484                         return map_nt_error_from_unix(errno);
 485                 }
 486                 psd = default_file_sd(ctx, &smb_fname->st);
 487                 if (!psd) {
 488                         return NT_STATUS_NO_MEMORY;
 489                 }
 490
 491                 if (DEBUGLEVEL >= 10) {
 492                         DEBUG(10,("inherit_new_acl: default acl is:\n"));
 493                         NDR_PRINT_DEBUG(security_descriptor, psd);
 494                 }
 495         }
 496
 497         /* Object exists. Read the current SD to get the hash. */
 498         if (fsp) {
 499                 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 500                                 fsp,
 501                                 HASH_SECURITY_INFO,
 502                                 &pdesc_next);
 503         } else {
 504                 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 505                                 smb_fname->base_name,
 506                                 HASH_SECURITY_INFO,
 507                                 &pdesc_next);
 508         }
 509
 510         if (!NT_STATUS_IS_OK(status)) {
 511                 return status;
 512         }
 513
 514         status = hash_sd(pdesc_next, hash);
 515         if (!NT_STATUS_IS_OK(status)) {
 516                 return status;
 517         }
 518         status = create_acl_blob(psd, &blob, hash);
 519         if (!NT_STATUS_IS_OK(status)) {
 520                 return status;
 521         }
 522         if (fsp) {
 523                 return store_acl_blob_fsp(handle, fsp, &blob);
 524         } else {
 525                 return store_acl_blob_pathname(handle, smb_fname->base_name,
 526                                                &blob);
 527         }
 528 }
 529
 530 /*********************************************************************
 531  Check ACL on open. For new files inherit from parent directory.
 532 *********************************************************************/
 533
 534 static int open_acl_xattr(vfs_handle_struct *handle,
 535                                         struct smb_filename *smb_fname,
 536                                         files_struct *fsp,
 537                                         int flags,
 538                                         mode_t mode)
 539 {
 540         uint32_t access_granted = 0;
 541         struct security_descriptor *pdesc = NULL;
 542         bool file_existed = true;
 543         char *fname = NULL;
 544         NTSTATUS status;
 545
 546         if (fsp->base_fsp) {
 547                 /* Stream open. Base filename open already did the ACL check. */
 548                 DEBUG(10,("open_acl_xattr: stream open on %s\n",
 549                         smb_fname_str_dbg(smb_fname) ));
 550                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 551         }
 552
 553         status = get_full_smb_filename(talloc_tos(), smb_fname,
 554                                        &fname);
 555         if (!NT_STATUS_IS_OK(status)) {
 556                 errno = map_errno_from_nt_status(status);
 557                 return -1;
 558         }
 559
 560         status = get_nt_acl_xattr_internal(handle,
 561                                         NULL,
 562                                         fname,
 563                                         (OWNER_SECURITY_INFORMATION |
 564                                          GROUP_SECURITY_INFORMATION |
 565                                          DACL_SECURITY_INFORMATION),
 566                                         &pdesc);
 567         if (NT_STATUS_IS_OK(status)) {
 568                 /* See if we can access it. */
 569                 status = smb1_file_se_access_check(pdesc,
 570                                         handle->conn->server_info->ptok,
 571                                         fsp->access_mask,
 572                                         &access_granted);
 573                 if (!NT_STATUS_IS_OK(status)) {
 574                         DEBUG(10,("open_acl_xattr: file %s open "
 575                                 "refused with error %s\n",
 576                                 smb_fname_str_dbg(smb_fname),
 577                                 nt_errstr(status) ));
 578                         errno = map_errno_from_nt_status(status);
 579                         return -1;
 580                 }
 581         } else if (NT_STATUS_EQUAL(status,NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 582                 file_existed = false;
 583         }
 584
 585         DEBUG(10,("open_acl_xattr: get_nt_acl_attr_internal for "
 586                 "file %s returned %s\n",
 587                 smb_fname_str_dbg(smb_fname),
 588                 nt_errstr(status) ));
 589
 590         fsp->fh->fd = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 591
 592         if (!file_existed && fsp->fh->fd != -1) {
 593                 /* File was created. Inherit from parent directory. */
 594                 status = fsp_set_smb_fname(fsp, smb_fname);
 595                 if (!NT_STATUS_IS_OK(status)) {
 596                         errno = map_errno_from_nt_status(status);
 597                         return -1;
 598                 }
 599                 inherit_new_acl(handle, smb_fname, fsp, false);
 600         }
 601
 602         return fsp->fh->fd;
 603 }
 604
 605 static int mkdir_acl_xattr(vfs_handle_struct *handle, const char *path, mode_t mode)
 606 {
 607         struct smb_filename *smb_fname = NULL;
 608         int ret = SMB_VFS_NEXT_MKDIR(handle, path, mode);
 609         NTSTATUS status;
 610
 611         if (ret == -1) {
 612                 return ret;
 613         }
 614
 615         status = create_synthetic_smb_fname(talloc_tos(), path, NULL, NULL,
 616                                             &smb_fname);
 617         if (!NT_STATUS_IS_OK(status)) {
 618                 errno = map_errno_from_nt_status(status);
 619                 return -1;
 620         }
 621
 622         /* New directory - inherit from parent. */
 623         inherit_new_acl(handle, smb_fname, NULL, true);
 624         TALLOC_FREE(smb_fname);
 625         return ret;
 626 }
 627
 628 /*********************************************************************
 629  Fetch a security descriptor given an fsp.
 630 *********************************************************************/
 631
 632 static NTSTATUS fget_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
 633         uint32 security_info, struct security_descriptor **ppdesc)
 634 {
 635         return get_nt_acl_xattr_internal(handle, fsp,
 636                                 NULL, security_info, ppdesc);
 637 }
 638
 639 /*********************************************************************
 640  Fetch a security descriptor given a pathname.
 641 *********************************************************************/
 642
 643 static NTSTATUS get_nt_acl_xattr(vfs_handle_struct *handle,
 644         const char *name, uint32 security_info, struct security_descriptor **ppdesc)
 645 {
 646         return get_nt_acl_xattr_internal(handle, NULL,
 647                                 name, security_info, ppdesc);
 648 }
 649
 650 /*********************************************************************
 651  Store a security descriptor given an fsp.
 652 *********************************************************************/
 653
 654 static NTSTATUS fset_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
 655         uint32 security_info_sent, const struct security_descriptor *psd)
 656 {
 657         NTSTATUS status;
 658         DATA_BLOB blob;
 659         struct security_descriptor *pdesc_next = NULL;
 660         uint8_t hash[16];
 661
 662         if (DEBUGLEVEL >= 10) {
 663                 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
 664                           fsp_str_dbg(fsp)));
 665                 NDR_PRINT_DEBUG(security_descriptor,
 666                         CONST_DISCARD(struct security_descriptor *,psd));
 667         }
 668
 669         /* Ensure owner and group are set. */
 670         if (!psd->owner_sid || !psd->group_sid) {
 671                 int ret;
 672                 DOM_SID owner_sid, group_sid;
 673                 struct security_descriptor *nc_psd = dup_sec_desc(talloc_tos(), psd);
 674
 675                 if (!nc_psd) {
 676                         return NT_STATUS_OK;
 677                 }
 678                 if (fsp->is_directory || fsp->fh->fd == -1) {
 679                         if (fsp->posix_open) {
 680                                 ret = SMB_VFS_LSTAT(fsp->conn, fsp->fsp_name);
 681                         } else {
 682                                 ret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name);
 683                         }
 684                 } else {
 685                         ret = SMB_VFS_FSTAT(fsp, &fsp->fsp_name->st);
 686                 }
 687                 if (ret == -1) {
 688                         /* Lower level acl set succeeded,
 689                          * so still return OK. */
 690                         return NT_STATUS_OK;
 691                 }
 692                 create_file_sids(&fsp->fsp_name->st, &owner_sid, &group_sid);
 693                 /* This is safe as nc_psd is discarded at fn exit. */
 694                 nc_psd->owner_sid = &owner_sid;
 695                 nc_psd->group_sid = &group_sid;
 696                 security_info_sent |= (OWNER_SECURITY_INFORMATION|GROUP_SECURITY_INFORMATION);
 697                 psd = nc_psd;
 698         }
 699
 700         status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 701         if (!NT_STATUS_IS_OK(status)) {
 702                 return status;
 703         }
 704
 705         /* Get the full underlying sd, then hash. */
 706         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 707                                 fsp,
 708                                 HASH_SECURITY_INFO,
 709                                 &pdesc_next);
 710
 711         if (!NT_STATUS_IS_OK(status)) {
 712                 return status;
 713         }
 714
 715         status = hash_sd(pdesc_next, hash);
 716         if (!NT_STATUS_IS_OK(status)) {
 717                 return status;
 718         }
 719
 720 #if 0
 721         if ((security_info_sent & DACL_SECURITY_INFORMATION) &&
 722                         psd->dacl != NULL &&
 723                         (psd->type & (SE_DESC_DACL_AUTO_INHERITED|
 724                                 SE_DESC_DACL_AUTO_INHERIT_REQ))==
 725                                 (SE_DESC_DACL_AUTO_INHERITED|
 726                                 SE_DESC_DACL_AUTO_INHERIT_REQ) ) {
 727                 struct security_descriptor *new_psd = NULL;
 728                 status = append_parent_acl(fsp, psd, &new_psd);
 729                 if (!NT_STATUS_IS_OK(status)) {
 730                         /* Lower level acl set succeeded,
 731                          * so still return OK. */
 732                         return NT_STATUS_OK;
 733                 }
 734                 psd = new_psd;
 735         }
 736 #endif
 737
 738         if (DEBUGLEVEL >= 10) {
 739                 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
 740                           fsp_str_dbg(fsp)));
 741                 NDR_PRINT_DEBUG(security_descriptor,
 742                         CONST_DISCARD(struct security_descriptor *,psd));
 743         }
 744         create_acl_blob(psd, &blob, hash);
 745         store_acl_blob_fsp(handle, fsp, &blob);
 746
 747         return NT_STATUS_OK;
 748 }
 749
 750 /*********************************************************************
 751  Remove a Windows ACL - we're setting the underlying POSIX ACL.
 752 *********************************************************************/
 753
 754 static int sys_acl_set_file_xattr(vfs_handle_struct *handle,
 755                               const char *name,
 756                               SMB_ACL_TYPE_T type,
 757                               SMB_ACL_T theacl)
 758 {
 759         int ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
 760                                                 name,
 761                                                 type,
 762                                                 theacl);
 763         if (ret == -1) {
 764                 return -1;
 765         }
 766
 767         become_root();
 768         SMB_VFS_REMOVEXATTR(handle->conn, name, XATTR_NTACL_NAME);
 769         unbecome_root();
 770
 771         return ret;
 772 }
 773
 774 /*********************************************************************
 775  Remove a Windows ACL - we're setting the underlying POSIX ACL.
 776 *********************************************************************/
 777
 778 static int sys_acl_set_fd_xattr(vfs_handle_struct *handle,
 779                             files_struct *fsp,
 780                             SMB_ACL_T theacl)
 781 {
 782         int ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
 783                                                 fsp,
 784                                                 theacl);
 785         if (ret == -1) {
 786                 return -1;
 787         }
 788
 789         become_root();
 790         SMB_VFS_FREMOVEXATTR(fsp, XATTR_NTACL_NAME);
 791         unbecome_root();
 792
 793         return ret;
 794 }
 795
 796 /* VFS operations structure */
 797
 798 static vfs_op_tuple skel_op_tuples[] =
 799 {
 800         {SMB_VFS_OP(mkdir_acl_xattr), SMB_VFS_OP_MKDIR, SMB_VFS_LAYER_TRANSPARENT},
 801         {SMB_VFS_OP(open_acl_xattr),  SMB_VFS_OP_OPEN,  SMB_VFS_LAYER_TRANSPARENT},
 802
 803         /* NT File ACL operations */
 804
 805         {SMB_VFS_OP(fget_nt_acl_xattr),SMB_VFS_OP_FGET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
 806         {SMB_VFS_OP(get_nt_acl_xattr), SMB_VFS_OP_GET_NT_ACL, SMB_VFS_LAYER_TRANSPARENT},
 807         {SMB_VFS_OP(fset_nt_acl_xattr),SMB_VFS_OP_FSET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
 808
 809         /* POSIX ACL operations. */
 810         {SMB_VFS_OP(sys_acl_set_file_xattr), SMB_VFS_OP_SYS_ACL_SET_FILE, SMB_VFS_LAYER_TRANSPARENT},
 811         {SMB_VFS_OP(sys_acl_set_fd_xattr), SMB_VFS_OP_SYS_ACL_SET_FD, SMB_VFS_LAYER_TRANSPARENT},
 812
 813         {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
 814 };
 815
 816 NTSTATUS vfs_acl_xattr_init(void)
 817 {
 818         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_xattr", skel_op_tuples);
 819 }