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 #include "smbd/smbd.h"
  23 #include "system/filesys.h"
  24 #include "../libcli/security/security.h"
  25 #include "../librpc/gen_ndr/ndr_security.h"
  26 #include "../lib/util/bitmap.h"
  27
  28 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
  29                         DATA_BLOB *pblob,
  30                         uint16_t hash_type,
  31                         uint8_t hash[XATTR_SD_HASH_SIZE]);
  32
  33 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
  34                         vfs_handle_struct *handle,
  35                         files_struct *fsp,
  36                         const char *name,
  37                         DATA_BLOB *pblob);
  38
  39 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
  40                         files_struct *fsp,
  41                         DATA_BLOB *pblob);
  42
  43 #define HASH_SECURITY_INFO (SECINFO_OWNER | \
  44                                 SECINFO_GROUP | \
  45                                 SECINFO_DACL | \
  46                                 SECINFO_SACL)
  47
  48 /*******************************************************************
  49  Hash a security descriptor.
  50 *******************************************************************/
  51
  52 static NTSTATUS hash_sd_sha256(struct security_descriptor *psd,
  53                         uint8_t *hash)
  54 {
  55         DATA_BLOB blob;
  56         SHA256_CTX tctx;
  57         NTSTATUS status;
  58
  59         memset(hash, '\0', XATTR_SD_HASH_SIZE);
  60         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
  61         if (!NT_STATUS_IS_OK(status)) {
  62                 return status;
  63         }
  64
  65         samba_SHA256_Init(&tctx);
  66         samba_SHA256_Update(&tctx, blob.data, blob.length);
  67         samba_SHA256_Final(hash, &tctx);
  68
  69         return NT_STATUS_OK;
  70 }
  71
  72 /*******************************************************************
  73  Parse out a struct security_descriptor from a DATA_BLOB.
  74 *******************************************************************/
  75
  76 static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
  77                                 struct security_descriptor **ppdesc,
  78                                 uint16_t *p_hash_type,
  79                                 uint8_t hash[XATTR_SD_HASH_SIZE])
  80 {
  81         TALLOC_CTX *ctx = talloc_tos();
  82         struct xattr_NTACL xacl;
  83         enum ndr_err_code ndr_err;
  84         size_t sd_size;
  85
  86         ndr_err = ndr_pull_struct_blob(pblob, ctx, &xacl,
  87                         (ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
  88
  89         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  90                 DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
  91                         ndr_errstr(ndr_err)));
  92                 return ndr_map_error2ntstatus(ndr_err);
  93         }
  94
  95         switch (xacl.version) {
  96                 case 1:
  97                         *ppdesc = make_sec_desc(ctx, SD_REVISION,
  98                                         xacl.info.sd->type | SEC_DESC_SELF_RELATIVE,
  99                                         xacl.info.sd->owner_sid,
 100                                         xacl.info.sd->group_sid,
 101                                         xacl.info.sd->sacl,
 102                                         xacl.info.sd->dacl,
 103                                         &sd_size);
 104                         /* No hash - null out. */
 105                         *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
 106                         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 107                         break;
 108                 case 2:
 109                         *ppdesc = make_sec_desc(ctx, SD_REVISION,
 110                                         xacl.info.sd_hs2->sd->type | SEC_DESC_SELF_RELATIVE,
 111                                         xacl.info.sd_hs2->sd->owner_sid,
 112                                         xacl.info.sd_hs2->sd->group_sid,
 113                                         xacl.info.sd_hs2->sd->sacl,
 114                                         xacl.info.sd_hs2->sd->dacl,
 115                                         &sd_size);
 116                         /* No hash - null out. */
 117                         *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
 118                         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 119                         break;
 120                 case 3:
 121                         *ppdesc = make_sec_desc(ctx, SD_REVISION,
 122                                         xacl.info.sd_hs3->sd->type | SEC_DESC_SELF_RELATIVE,
 123                                         xacl.info.sd_hs3->sd->owner_sid,
 124                                         xacl.info.sd_hs3->sd->group_sid,
 125                                         xacl.info.sd_hs3->sd->sacl,
 126                                         xacl.info.sd_hs3->sd->dacl,
 127                                         &sd_size);
 128                         *p_hash_type = xacl.info.sd_hs3->hash_type;
 129                         /* Current version 3. */
 130                         memcpy(hash, xacl.info.sd_hs3->hash, XATTR_SD_HASH_SIZE);
 131                         break;
 132                 default:
 133                         return NT_STATUS_REVISION_MISMATCH;
 134         }
 135
 136         TALLOC_FREE(xacl.info.sd);
 137
 138         return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
 139 }
 140
 141 /*******************************************************************
 142  Create a DATA_BLOB from a security descriptor.
 143 *******************************************************************/
 144
 145 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
 146                         DATA_BLOB *pblob,
 147                         uint16_t hash_type,
 148                         uint8_t hash[XATTR_SD_HASH_SIZE])
 149 {
 150         struct xattr_NTACL xacl;
 151         struct security_descriptor_hash_v3 sd_hs3;
 152         enum ndr_err_code ndr_err;
 153         TALLOC_CTX *ctx = talloc_tos();
 154
 155         ZERO_STRUCT(xacl);
 156         ZERO_STRUCT(sd_hs3);
 157
 158         xacl.version = 3;
 159         xacl.info.sd_hs3 = &sd_hs3;
 160         xacl.info.sd_hs3->sd = discard_const_p(struct security_descriptor, psd);
 161         xacl.info.sd_hs3->hash_type = hash_type;
 162         memcpy(&xacl.info.sd_hs3->hash[0], hash, XATTR_SD_HASH_SIZE);
 163
 164         ndr_err = ndr_push_struct_blob(
 165                         pblob, ctx, &xacl,
 166                         (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
 167
 168         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 169                 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
 170                         ndr_errstr(ndr_err)));
 171                 return ndr_map_error2ntstatus(ndr_err);
 172         }
 173
 174         return NT_STATUS_OK;
 175 }
 176
 177 /*******************************************************************
 178  Add in 3 inheritable components for a non-inheritable directory ACL.
 179  CREATOR_OWNER/CREATOR_GROUP/WORLD.
 180 *******************************************************************/
 181
 182 static NTSTATUS add_directory_inheritable_components(vfs_handle_struct *handle,
 183                                 const char *name,
 184                                 SMB_STRUCT_STAT *psbuf,
 185                                 struct security_descriptor *psd)
 186 {
 187         struct connection_struct *conn = handle->conn;
 188         int num_aces = (psd->dacl ? psd->dacl->num_aces : 0);
 189         struct smb_filename smb_fname;
 190         enum security_ace_type acltype;
 191         uint32_t access_mask;
 192         mode_t dir_mode;
 193         mode_t file_mode;
 194         mode_t mode;
 195         struct security_ace *new_ace_list = talloc_zero_array(talloc_tos(),
 196                                                 struct security_ace,
 197                                                 num_aces + 3);
 198
 199         if (new_ace_list == NULL) {
 200                 return NT_STATUS_NO_MEMORY;
 201         }
 202
 203         /* Fake a quick smb_filename. */
 204         ZERO_STRUCT(smb_fname);
 205         smb_fname.st = *psbuf;
 206         smb_fname.base_name = discard_const_p(char, name);
 207
 208         dir_mode = unix_mode(conn,
 209                         FILE_ATTRIBUTE_DIRECTORY, &smb_fname, NULL);
 210         file_mode = unix_mode(conn,
 211                         FILE_ATTRIBUTE_ARCHIVE, &smb_fname, NULL);
 212
 213         mode = dir_mode | file_mode;
 214
 215         DEBUG(10, ("add_directory_inheritable_components: directory %s, "
 216                 "mode = 0%o\n",
 217                 name,
 218                 (unsigned int)mode ));
 219
 220         if (num_aces) {
 221                 memcpy(new_ace_list, psd->dacl->aces,
 222                         num_aces * sizeof(struct security_ace));
 223         }
 224         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 225                                 mode & 0700, false);
 226
 227         init_sec_ace(&new_ace_list[num_aces],
 228                         &global_sid_Creator_Owner,
 229                         acltype,
 230                         access_mask,
 231                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 232                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 233                                 SEC_ACE_FLAG_INHERIT_ONLY);
 234         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 235                                 (mode << 3) & 0700, false);
 236         init_sec_ace(&new_ace_list[num_aces+1],
 237                         &global_sid_Creator_Group,
 238                         acltype,
 239                         access_mask,
 240                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 241                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 242                                 SEC_ACE_FLAG_INHERIT_ONLY);
 243         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 244                                 (mode << 6) & 0700, false);
 245         init_sec_ace(&new_ace_list[num_aces+2],
 246                         &global_sid_World,
 247                         acltype,
 248                         access_mask,
 249                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 250                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 251                                 SEC_ACE_FLAG_INHERIT_ONLY);
 252         if (psd->dacl) {
 253                 psd->dacl->aces = new_ace_list;
 254                 psd->dacl->num_aces += 3;
 255         } else {
 256                 psd->dacl = make_sec_acl(talloc_tos(),
 257                                 NT4_ACL_REVISION,
 258                                 3,
 259                                 new_ace_list);
 260                 if (psd->dacl == NULL) {
 261                         return NT_STATUS_NO_MEMORY;
 262                 }
 263         }
 264         return NT_STATUS_OK;
 265 }
 266
 267 /*******************************************************************
 268  Pull a DATA_BLOB from an xattr given a pathname.
 269  If the hash doesn't match, or doesn't exist - return the underlying
 270  filesystem sd.
 271 *******************************************************************/
 272
 273 static NTSTATUS get_nt_acl_internal(vfs_handle_struct *handle,
 274                                 files_struct *fsp,
 275                                 const char *name,
 276                                 uint32_t security_info,
 277                                 struct security_descriptor **ppdesc)
 278 {
 279         DATA_BLOB blob = data_blob_null;
 280         NTSTATUS status;
 281         uint16_t hash_type = XATTR_SD_HASH_TYPE_NONE;
 282         uint8_t hash[XATTR_SD_HASH_SIZE];
 283         uint8_t hash_tmp[XATTR_SD_HASH_SIZE];
 284         struct security_descriptor *psd = NULL;
 285         struct security_descriptor *pdesc_next = NULL;
 286         bool ignore_file_system_acl = lp_parm_bool(SNUM(handle->conn),
 287                                                 ACL_MODULE_NAME,
 288                                                 "ignore system acls",
 289                                                 false);
 290
 291         if (fsp && name == NULL) {
 292                 name = fsp->fsp_name->base_name;
 293         }
 294
 295         DEBUG(10, ("get_nt_acl_internal: name=%s\n", name));
 296
 297         /* Get the full underlying sd for the hash
 298            or to return as backup. */
 299         if (fsp) {
 300                 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 301                                 fsp,
 302                                 HASH_SECURITY_INFO,
 303                                 &pdesc_next);
 304         } else {
 305                 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 306                                 name,
 307                                 HASH_SECURITY_INFO,
 308                                 &pdesc_next);
 309         }
 310
 311         if (!NT_STATUS_IS_OK(status)) {
 312                 DEBUG(10, ("get_nt_acl_internal: get_next_acl for file %s "
 313                         "returned %s\n",
 314                         name,
 315                         nt_errstr(status)));
 316                 return status;
 317         }
 318
 319         status = get_acl_blob(talloc_tos(), handle, fsp, name, &blob);
 320         if (!NT_STATUS_IS_OK(status)) {
 321                 DEBUG(10, ("get_nt_acl_internal: get_acl_blob returned %s\n",
 322                         nt_errstr(status)));
 323                 psd = pdesc_next;
 324                 goto out;
 325         }
 326
 327         status = parse_acl_blob(&blob, &psd,
 328                                 &hash_type, &hash[0]);
 329         if (!NT_STATUS_IS_OK(status)) {
 330                 DEBUG(10, ("parse_acl_blob returned %s\n",
 331                                 nt_errstr(status)));
 332                 psd = pdesc_next;
 333                 goto out;
 334         }
 335
 336         /* Ensure the hash type is one we know. */
 337         switch (hash_type) {
 338                 case XATTR_SD_HASH_TYPE_NONE:
 339                         /* No hash, just return blob sd. */
 340                         goto out;
 341                 case XATTR_SD_HASH_TYPE_SHA256:
 342                         break;
 343                 default:
 344                         DEBUG(10, ("get_nt_acl_internal: ACL blob revision "
 345                                 "mismatch (%u) for file %s\n",
 346                                 (unsigned int)hash_type,
 347                                 name));
 348                         TALLOC_FREE(psd);
 349                         psd = pdesc_next;
 350                         goto out;
 351         }
 352
 353         if (ignore_file_system_acl) {
 354                 goto out;
 355         }
 356
 357         status = hash_sd_sha256(pdesc_next, hash_tmp);
 358         if (!NT_STATUS_IS_OK(status)) {
 359                 TALLOC_FREE(psd);
 360                 psd = pdesc_next;
 361                 goto out;
 362         }
 363
 364         if (memcmp(&hash[0], &hash_tmp[0], XATTR_SD_HASH_SIZE) == 0) {
 365                 /* Hash matches, return blob sd. */
 366                 DEBUG(10, ("get_nt_acl_internal: blob hash "
 367                         "matches for file %s\n",
 368                         name ));
 369                 goto out;
 370         }
 371
 372         /* Hash doesn't match, return underlying sd. */
 373         TALLOC_FREE(psd);
 374         psd = pdesc_next;
 375
 376   out:
 377
 378         if (psd != pdesc_next) {
 379                 /* We're returning the blob, throw
 380                  * away the filesystem SD. */
 381                 TALLOC_FREE(pdesc_next);
 382         } else {
 383                 SMB_STRUCT_STAT sbuf;
 384                 SMB_STRUCT_STAT *psbuf = &sbuf;
 385                 bool is_directory = false;
 386                 /*
 387                  * We're returning the underlying ACL from the
 388                  * filesystem. If it's a directory, and has no
 389                  * inheritable ACE entries we have to fake them.
 390                  */
 391                 if (fsp) {
 392                         status = vfs_stat_fsp(fsp);
 393                         if (!NT_STATUS_IS_OK(status)) {
 394                                 return status;
 395                         }
 396                         psbuf = &fsp->fsp_name->st;
 397                 } else {
 398                         int ret = vfs_stat_smb_fname(handle->conn,
 399                                                 name,
 400                                                 &sbuf);
 401                         if (ret == -1) {
 402                                 return map_nt_error_from_unix(errno);
 403                         }
 404                 }
 405                 is_directory = S_ISDIR(psbuf->st_ex_mode);
 406
 407                 if (ignore_file_system_acl) {
 408                         TALLOC_FREE(pdesc_next);
 409                         status = make_default_filesystem_acl(talloc_tos(),
 410                                                 name,
 411                                                 psbuf,
 412                                                 &psd);
 413                         if (!NT_STATUS_IS_OK(status)) {
 414                                 return status;
 415                         }
 416                 } else {
 417                         if (is_directory &&
 418                                 !sd_has_inheritable_components(psd,
 419                                                         true)) {
 420                                 status = add_directory_inheritable_components(
 421                                                         handle,
 422                                                         name,
 423                                                         psbuf,
 424                                                         psd);
 425                                 if (!NT_STATUS_IS_OK(status)) {
 426                                         return status;
 427                                 }
 428                         }
 429                         /* The underlying POSIX module always sets
 430                            the ~SEC_DESC_DACL_PROTECTED bit, as ACLs
 431                            can't be inherited in this way under POSIX.
 432                            Remove it for Windows-style ACLs. */
 433                         psd->type &= ~SEC_DESC_DACL_PROTECTED;
 434                 }
 435         }
 436
 437         if (!(security_info & SECINFO_OWNER)) {
 438                 psd->owner_sid = NULL;
 439         }
 440         if (!(security_info & SECINFO_GROUP)) {
 441                 psd->group_sid = NULL;
 442         }
 443         if (!(security_info & SECINFO_DACL)) {
 444                 psd->type &= ~SEC_DESC_DACL_PRESENT;
 445                 psd->dacl = NULL;
 446         }
 447         if (!(security_info & SECINFO_SACL)) {
 448                 psd->type &= ~SEC_DESC_SACL_PRESENT;
 449                 psd->sacl = NULL;
 450         }
 451
 452         TALLOC_FREE(blob.data);
 453         *ppdesc = psd;
 454
 455         if (DEBUGLEVEL >= 10) {
 456                 DEBUG(10,("get_nt_acl_internal: returning acl for %s is:\n",
 457                         name ));
 458                 NDR_PRINT_DEBUG(security_descriptor, psd);
 459         }
 460
 461         return NT_STATUS_OK;
 462 }
 463
 464 /*********************************************************************
 465  Fetch a security descriptor given an fsp.
 466 *********************************************************************/
 467
 468 static NTSTATUS fget_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
 469         uint32_t security_info, struct security_descriptor **ppdesc)
 470 {
 471         return get_nt_acl_internal(handle, fsp,
 472                                 NULL, security_info, ppdesc);
 473 }
 474
 475 /*********************************************************************
 476  Fetch a security descriptor given a pathname.
 477 *********************************************************************/
 478
 479 static NTSTATUS get_nt_acl_common(vfs_handle_struct *handle,
 480         const char *name, uint32_t security_info, struct security_descriptor **ppdesc)
 481 {
 482         return get_nt_acl_internal(handle, NULL,
 483                                 name, security_info, ppdesc);
 484 }
 485
 486 /*********************************************************************
 487  Store a security descriptor given an fsp.
 488 *********************************************************************/
 489
 490 static NTSTATUS fset_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
 491         uint32_t security_info_sent, const struct security_descriptor *orig_psd)
 492 {
 493         NTSTATUS status;
 494         DATA_BLOB blob;
 495         struct security_descriptor *pdesc_next = NULL;
 496         struct security_descriptor *psd = NULL;
 497         uint8_t hash[XATTR_SD_HASH_SIZE];
 498         bool chown_needed = false;
 499
 500         if (DEBUGLEVEL >= 10) {
 501                 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
 502                           fsp_str_dbg(fsp)));
 503                 NDR_PRINT_DEBUG(security_descriptor,
 504                         discard_const_p(struct security_descriptor, orig_psd));
 505         }
 506
 507         status = get_nt_acl_internal(handle, fsp,
 508                         NULL,
 509                         SECINFO_OWNER|SECINFO_GROUP|SECINFO_DACL|SECINFO_SACL,
 510                         &psd);
 511
 512         if (!NT_STATUS_IS_OK(status)) {
 513                 return status;
 514         }
 515
 516         psd->revision = orig_psd->revision;
 517         /* All our SD's are self relative. */
 518         psd->type = orig_psd->type | SEC_DESC_SELF_RELATIVE;
 519
 520         if ((security_info_sent & SECINFO_OWNER) && (orig_psd->owner_sid != NULL)) {
 521                 if (!dom_sid_equal(orig_psd->owner_sid, psd->owner_sid)) {
 522                         /* We're changing the owner. */
 523                         chown_needed = true;
 524                 }
 525                 psd->owner_sid = orig_psd->owner_sid;
 526         }
 527         if ((security_info_sent & SECINFO_GROUP) && (orig_psd->group_sid != NULL)) {
 528                 if (!dom_sid_equal(orig_psd->group_sid, psd->group_sid)) {
 529                         /* We're changing the group. */
 530                         chown_needed = true;
 531                 }
 532                 psd->group_sid = orig_psd->group_sid;
 533         }
 534         if (security_info_sent & SECINFO_DACL) {
 535                 psd->dacl = orig_psd->dacl;
 536                 psd->type |= SEC_DESC_DACL_PRESENT;
 537         }
 538         if (security_info_sent & SECINFO_SACL) {
 539                 psd->sacl = orig_psd->sacl;
 540                 psd->type |= SEC_DESC_SACL_PRESENT;
 541         }
 542
 543         status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 544         if (!NT_STATUS_IS_OK(status)) {
 545                 if (!NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 546                         return status;
 547                 }
 548                 /* We got access denied here. If we're already root,
 549                    or we didn't need to do a chown, or the fsp isn't
 550                    open with WRITE_OWNER access, just return. */
 551                 if (get_current_uid(handle->conn) == 0 ||
 552                                 chown_needed == false ||
 553                                 !(fsp->access_mask & SEC_STD_WRITE_OWNER)) {
 554                         return NT_STATUS_ACCESS_DENIED;
 555                 }
 556
 557                 DEBUG(10,("fset_nt_acl_common: overriding chown on file %s "
 558                         "for sid %s\n",
 559                         fsp_str_dbg(fsp),
 560                         sid_string_tos(psd->owner_sid)
 561                         ));
 562
 563                 /* Ok, we failed to chown and we have
 564                    SEC_STD_WRITE_OWNER access - override. */
 565                 become_root();
 566                 status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp,
 567                                 security_info_sent, psd);
 568                 unbecome_root();
 569                 if (!NT_STATUS_IS_OK(status)) {
 570                         return status;
 571                 }
 572         }
 573
 574         /* Get the full underlying sd, then hash. */
 575         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 576                                 fsp,
 577                                 HASH_SECURITY_INFO,
 578                                 &pdesc_next);
 579
 580         if (!NT_STATUS_IS_OK(status)) {
 581                 return status;
 582         }
 583
 584         status = hash_sd_sha256(pdesc_next, hash);
 585         if (!NT_STATUS_IS_OK(status)) {
 586                 return status;
 587         }
 588
 589         if (DEBUGLEVEL >= 10) {
 590                 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
 591                           fsp_str_dbg(fsp)));
 592                 NDR_PRINT_DEBUG(security_descriptor,
 593                         discard_const_p(struct security_descriptor, psd));
 594         }
 595         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
 596         if (!NT_STATUS_IS_OK(status)) {
 597                 DEBUG(10, ("fset_nt_acl_xattr: create_acl_blob failed\n"));
 598                 return status;
 599         }
 600
 601         status = store_acl_blob_fsp(handle, fsp, &blob);
 602
 603         return status;
 604 }
 605
 606 static int acl_common_remove_object(vfs_handle_struct *handle,
 607                                         const char *path,
 608                                         bool is_directory)
 609 {
 610         connection_struct *conn = handle->conn;
 611         struct file_id id;
 612         files_struct *fsp = NULL;
 613         int ret = 0;
 614         char *parent_dir = NULL;
 615         const char *final_component = NULL;
 616         struct smb_filename local_fname;
 617         int saved_errno = 0;
 618         char *saved_dir = NULL;
 619
 620         saved_dir = vfs_GetWd(talloc_tos(),conn);
 621         if (!saved_dir) {
 622                 saved_errno = errno;
 623                 goto out;
 624         }
 625
 626         if (!parent_dirname(talloc_tos(), path,
 627                         &parent_dir, &final_component)) {
 628                 saved_errno = ENOMEM;
 629                 goto out;
 630         }
 631
 632         DEBUG(10,("acl_common_remove_object: removing %s %s/%s\n",
 633                 is_directory ? "directory" : "file",
 634                 parent_dir, final_component ));
 635
 636         /* cd into the parent dir to pin it. */
 637         ret = vfs_ChDir(conn, parent_dir);
 638         if (ret == -1) {
 639                 saved_errno = errno;
 640                 goto out;
 641         }
 642
 643         ZERO_STRUCT(local_fname);
 644         local_fname.base_name = discard_const_p(char, final_component);
 645
 646         /* Must use lstat here. */
 647         ret = SMB_VFS_LSTAT(conn, &local_fname);
 648         if (ret == -1) {
 649                 saved_errno = errno;
 650                 goto out;
 651         }
 652
 653         /* Ensure we have this file open with DELETE access. */
 654         id = vfs_file_id_from_sbuf(conn, &local_fname.st);
 655         for (fsp = file_find_di_first(conn->sconn, id); fsp;
 656                      fsp = file_find_di_next(fsp)) {
 657                 if (fsp->access_mask & DELETE_ACCESS &&
 658                                 fsp->delete_on_close) {
 659                         /* We did open this for delete,
 660                          * allow the delete as root.
 661                          */
 662                         break;
 663                 }
 664         }
 665
 666         if (!fsp) {
 667                 DEBUG(10,("acl_common_remove_object: %s %s/%s "
 668                         "not an open file\n",
 669                         is_directory ? "directory" : "file",
 670                         parent_dir, final_component ));
 671                 saved_errno = EACCES;
 672                 goto out;
 673         }
 674
 675         become_root();
 676         if (is_directory) {
 677                 ret = SMB_VFS_NEXT_RMDIR(handle, final_component);
 678         } else {
 679                 ret = SMB_VFS_NEXT_UNLINK(handle, &local_fname);
 680         }
 681         unbecome_root();
 682
 683         if (ret == -1) {
 684                 saved_errno = errno;
 685         }
 686
 687   out:
 688
 689         TALLOC_FREE(parent_dir);
 690
 691         if (saved_dir) {
 692                 vfs_ChDir(conn, saved_dir);
 693         }
 694         if (saved_errno) {
 695                 errno = saved_errno;
 696         }
 697         return ret;
 698 }
 699
 700 static int rmdir_acl_common(struct vfs_handle_struct *handle,
 701                                 const char *path)
 702 {
 703         int ret;
 704
 705         /* Try the normal rmdir first. */
 706         ret = SMB_VFS_NEXT_RMDIR(handle, path);
 707         if (ret == 0) {
 708                 return 0;
 709         }
 710         if (errno == EACCES || errno == EPERM) {
 711                 /* Failed due to access denied,
 712                    see if we need to root override. */
 713                 return acl_common_remove_object(handle,
 714                                                 path,
 715                                                 true);
 716         }
 717
 718         DEBUG(10,("rmdir_acl_common: unlink of %s failed %s\n",
 719                 path,
 720                 strerror(errno) ));
 721         return -1;
 722 }
 723
 724 static int unlink_acl_common(struct vfs_handle_struct *handle,
 725                         const struct smb_filename *smb_fname)
 726 {
 727         int ret;
 728
 729         /* Try the normal unlink first. */
 730         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 731         if (ret == 0) {
 732                 return 0;
 733         }
 734         if (errno == EACCES || errno == EPERM) {
 735                 /* Failed due to access denied,
 736                    see if we need to root override. */
 737
 738                 /* Don't do anything fancy for streams. */
 739                 if (smb_fname->stream_name) {
 740                         return -1;
 741                 }
 742                 return acl_common_remove_object(handle,
 743                                         smb_fname->base_name,
 744                                         false);
 745         }
 746
 747         DEBUG(10,("unlink_acl_common: unlink of %s failed %s\n",
 748                 smb_fname->base_name,
 749                 strerror(errno) ));
 750         return -1;
 751 }
 752
 753 static int chmod_acl_module_common(struct vfs_handle_struct *handle,
 754                         const char *path, mode_t mode)
 755 {
 756         if (lp_posix_pathnames()) {
 757                 /* Only allow this on POSIX pathnames. */
 758                 return SMB_VFS_NEXT_CHMOD(handle, path, mode);
 759         }
 760         return 0;
 761 }
 762
 763 static int fchmod_acl_module_common(struct vfs_handle_struct *handle,
 764                         struct files_struct *fsp, mode_t mode)
 765 {
 766         if (fsp->posix_open) {
 767                 /* Only allow this on POSIX opens. */
 768                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
 769         }
 770         return 0;
 771 }
 772
 773 static int chmod_acl_acl_module_common(struct vfs_handle_struct *handle,
 774                         const char *name, mode_t mode)
 775 {
 776         if (lp_posix_pathnames()) {
 777                 /* Only allow this on POSIX pathnames. */
 778                 return SMB_VFS_NEXT_CHMOD_ACL(handle, name, mode);
 779         }
 780         return 0;
 781 }
 782
 783 static int fchmod_acl_acl_module_common(struct vfs_handle_struct *handle,
 784                         struct files_struct *fsp, mode_t mode)
 785 {
 786         if (fsp->posix_open) {
 787                 /* Only allow this on POSIX opens. */
 788                 return SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);
 789         }
 790         return 0;
 791 }