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 #include "passdb/lookup_sid.h"
  28
  29 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
  30                         DATA_BLOB *pblob,
  31                         uint16_t hash_type,
  32                         uint8_t hash[XATTR_SD_HASH_SIZE]);
  33
  34 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
  35                         vfs_handle_struct *handle,
  36                         files_struct *fsp,
  37                         const struct smb_filename *smb_fname,
  38                         DATA_BLOB *pblob);
  39
  40 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
  41                         files_struct *fsp,
  42                         DATA_BLOB *pblob);
  43
  44 #define HASH_SECURITY_INFO (SECINFO_OWNER | \
  45                                 SECINFO_GROUP | \
  46                                 SECINFO_DACL | \
  47                                 SECINFO_SACL)
  48
  49 /*******************************************************************
  50  Hash a security descriptor.
  51 *******************************************************************/
  52
  53 static NTSTATUS hash_blob_sha256(DATA_BLOB blob,
  54                                  uint8_t *hash)
  55 {
  56         SHA256_CTX tctx;
  57
  58         memset(hash, '\0', XATTR_SD_HASH_SIZE);
  59
  60         samba_SHA256_Init(&tctx);
  61         samba_SHA256_Update(&tctx, blob.data, blob.length);
  62         samba_SHA256_Final(hash, &tctx);
  63
  64         return NT_STATUS_OK;
  65 }
  66
  67 /*******************************************************************
  68  Hash a security descriptor.
  69 *******************************************************************/
  70
  71 static NTSTATUS hash_sd_sha256(struct security_descriptor *psd,
  72                         uint8_t *hash)
  73 {
  74         DATA_BLOB blob;
  75         NTSTATUS status;
  76
  77         memset(hash, '\0', XATTR_SD_HASH_SIZE);
  78         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
  79         if (!NT_STATUS_IS_OK(status)) {
  80                 return status;
  81         }
  82         return hash_blob_sha256(blob, hash);
  83 }
  84
  85 /*******************************************************************
  86  Parse out a struct security_descriptor from a DATA_BLOB.
  87 *******************************************************************/
  88
  89 static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
  90                                TALLOC_CTX *mem_ctx,
  91                                struct security_descriptor **ppdesc,
  92                                uint16_t *p_hash_type,
  93                                uint16_t *p_version,
  94                                uint8_t hash[XATTR_SD_HASH_SIZE],
  95                                uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE])
  96 {
  97         struct xattr_NTACL xacl;
  98         enum ndr_err_code ndr_err;
  99         size_t sd_size;
 100         TALLOC_CTX *frame = talloc_stackframe();
 101
 102         ndr_err = ndr_pull_struct_blob(pblob, frame, &xacl,
 103                         (ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
 104
 105         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 106                 DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
 107                         ndr_errstr(ndr_err)));
 108                 TALLOC_FREE(frame);
 109                 return ndr_map_error2ntstatus(ndr_err);
 110         }
 111
 112         *p_version = xacl.version;
 113
 114         switch (xacl.version) {
 115                 case 1:
 116                         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 117                                         xacl.info.sd->type | SEC_DESC_SELF_RELATIVE,
 118                                         xacl.info.sd->owner_sid,
 119                                         xacl.info.sd->group_sid,
 120                                         xacl.info.sd->sacl,
 121                                         xacl.info.sd->dacl,
 122                                         &sd_size);
 123                         /* No hash - null out. */
 124                         *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
 125                         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 126                         break;
 127                 case 2:
 128                         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 129                                         xacl.info.sd_hs2->sd->type | SEC_DESC_SELF_RELATIVE,
 130                                         xacl.info.sd_hs2->sd->owner_sid,
 131                                         xacl.info.sd_hs2->sd->group_sid,
 132                                         xacl.info.sd_hs2->sd->sacl,
 133                                         xacl.info.sd_hs2->sd->dacl,
 134                                         &sd_size);
 135                         /* No hash - null out. */
 136                         *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
 137                         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 138                         break;
 139                 case 3:
 140                         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 141                                         xacl.info.sd_hs3->sd->type | SEC_DESC_SELF_RELATIVE,
 142                                         xacl.info.sd_hs3->sd->owner_sid,
 143                                         xacl.info.sd_hs3->sd->group_sid,
 144                                         xacl.info.sd_hs3->sd->sacl,
 145                                         xacl.info.sd_hs3->sd->dacl,
 146                                         &sd_size);
 147                         *p_hash_type = xacl.info.sd_hs3->hash_type;
 148                         /* Current version 3 (if no sys acl hash available). */
 149                         memcpy(hash, xacl.info.sd_hs3->hash, XATTR_SD_HASH_SIZE);
 150                         break;
 151                 case 4:
 152                         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 153                                         xacl.info.sd_hs4->sd->type | SEC_DESC_SELF_RELATIVE,
 154                                         xacl.info.sd_hs4->sd->owner_sid,
 155                                         xacl.info.sd_hs4->sd->group_sid,
 156                                         xacl.info.sd_hs4->sd->sacl,
 157                                         xacl.info.sd_hs4->sd->dacl,
 158                                         &sd_size);
 159                         *p_hash_type = xacl.info.sd_hs4->hash_type;
 160                         /* Current version 4. */
 161                         memcpy(hash, xacl.info.sd_hs4->hash, XATTR_SD_HASH_SIZE);
 162                         memcpy(sys_acl_hash, xacl.info.sd_hs4->sys_acl_hash, XATTR_SD_HASH_SIZE);
 163                         break;
 164                 default:
 165                         TALLOC_FREE(frame);
 166                         return NT_STATUS_REVISION_MISMATCH;
 167         }
 168
 169         TALLOC_FREE(frame);
 170
 171         return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
 172 }
 173
 174 /*******************************************************************
 175  Create a DATA_BLOB from a hash of the security descriptor storead at
 176  the system layer and the NT ACL we wish to preserve
 177 *******************************************************************/
 178
 179 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
 180                         DATA_BLOB *pblob,
 181                         uint16_t hash_type,
 182                         uint8_t hash[XATTR_SD_HASH_SIZE])
 183 {
 184         struct xattr_NTACL xacl;
 185         struct security_descriptor_hash_v3 sd_hs3;
 186         enum ndr_err_code ndr_err;
 187         TALLOC_CTX *ctx = talloc_tos();
 188
 189         ZERO_STRUCT(xacl);
 190         ZERO_STRUCT(sd_hs3);
 191
 192         xacl.version = 3;
 193         xacl.info.sd_hs3 = &sd_hs3;
 194         xacl.info.sd_hs3->sd = discard_const_p(struct security_descriptor, psd);
 195         xacl.info.sd_hs3->hash_type = hash_type;
 196         memcpy(&xacl.info.sd_hs3->hash[0], hash, XATTR_SD_HASH_SIZE);
 197
 198         ndr_err = ndr_push_struct_blob(
 199                         pblob, ctx, &xacl,
 200                         (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
 201
 202         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 203                 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
 204                         ndr_errstr(ndr_err)));
 205                 return ndr_map_error2ntstatus(ndr_err);
 206         }
 207
 208         return NT_STATUS_OK;
 209 }
 210
 211 /*******************************************************************
 212  Create a DATA_BLOB from a hash of the security descriptors
 213  (system and NT) stored at the system layer and the NT ACL we wish
 214  to preserve.
 215 *******************************************************************/
 216
 217 static NTSTATUS create_sys_acl_blob(const struct security_descriptor *psd,
 218                                     DATA_BLOB *pblob,
 219                                     uint16_t hash_type,
 220                                     uint8_t hash[XATTR_SD_HASH_SIZE],
 221                                     const char *description,
 222                                     uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE])
 223 {
 224         struct xattr_NTACL xacl;
 225         struct security_descriptor_hash_v4 sd_hs4;
 226         enum ndr_err_code ndr_err;
 227         TALLOC_CTX *ctx = talloc_tos();
 228         NTTIME nttime_now;
 229         struct timeval now = timeval_current();
 230         nttime_now = timeval_to_nttime(&now);
 231
 232         ZERO_STRUCT(xacl);
 233         ZERO_STRUCT(sd_hs4);
 234
 235         xacl.version = 4;
 236         xacl.info.sd_hs4 = &sd_hs4;
 237         xacl.info.sd_hs4->sd = discard_const_p(struct security_descriptor, psd);
 238         xacl.info.sd_hs4->hash_type = hash_type;
 239         memcpy(&xacl.info.sd_hs4->hash[0], hash, XATTR_SD_HASH_SIZE);
 240         xacl.info.sd_hs4->description = description;
 241         xacl.info.sd_hs4->time = nttime_now;
 242         memcpy(&xacl.info.sd_hs4->sys_acl_hash[0], sys_acl_hash, XATTR_SD_HASH_SIZE);
 243
 244         ndr_err = ndr_push_struct_blob(
 245                         pblob, ctx, &xacl,
 246                         (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
 247
 248         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 249                 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
 250                         ndr_errstr(ndr_err)));
 251                 return ndr_map_error2ntstatus(ndr_err);
 252         }
 253
 254         return NT_STATUS_OK;
 255 }
 256
 257 /*******************************************************************
 258  Add in 3 inheritable components for a non-inheritable directory ACL.
 259  CREATOR_OWNER/CREATOR_GROUP/WORLD.
 260 *******************************************************************/
 261
 262 static NTSTATUS add_directory_inheritable_components(vfs_handle_struct *handle,
 263                                 const char *name,
 264                                 SMB_STRUCT_STAT *psbuf,
 265                                 struct security_descriptor *psd)
 266 {
 267         struct connection_struct *conn = handle->conn;
 268         int num_aces = (psd->dacl ? psd->dacl->num_aces : 0);
 269         struct smb_filename smb_fname;
 270         enum security_ace_type acltype;
 271         uint32_t access_mask;
 272         mode_t dir_mode;
 273         mode_t file_mode;
 274         mode_t mode;
 275         struct security_ace *new_ace_list;
 276
 277         if (psd->dacl) {
 278                 new_ace_list = talloc_zero_array(psd->dacl,
 279                                                  struct security_ace,
 280                                                  num_aces + 3);
 281         } else {
 282                 /*
 283                  * make_sec_acl() at the bottom of this function
 284                  * dupliates new_ace_list
 285                  */
 286                 new_ace_list = talloc_zero_array(talloc_tos(),
 287                                                  struct security_ace,
 288                                                  num_aces + 3);
 289         }
 290
 291         if (new_ace_list == NULL) {
 292                 return NT_STATUS_NO_MEMORY;
 293         }
 294
 295         /* Fake a quick smb_filename. */
 296         ZERO_STRUCT(smb_fname);
 297         smb_fname.st = *psbuf;
 298         smb_fname.base_name = discard_const_p(char, name);
 299
 300         dir_mode = unix_mode(conn,
 301                         FILE_ATTRIBUTE_DIRECTORY, &smb_fname, NULL);
 302         file_mode = unix_mode(conn,
 303                         FILE_ATTRIBUTE_ARCHIVE, &smb_fname, NULL);
 304
 305         mode = dir_mode | file_mode;
 306
 307         DEBUG(10, ("add_directory_inheritable_components: directory %s, "
 308                 "mode = 0%o\n",
 309                 name,
 310                 (unsigned int)mode ));
 311
 312         if (num_aces) {
 313                 memcpy(new_ace_list, psd->dacl->aces,
 314                         num_aces * sizeof(struct security_ace));
 315         }
 316         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 317                                 mode & 0700, false);
 318
 319         init_sec_ace(&new_ace_list[num_aces],
 320                         &global_sid_Creator_Owner,
 321                         acltype,
 322                         access_mask,
 323                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 324                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 325                                 SEC_ACE_FLAG_INHERIT_ONLY);
 326         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 327                                 (mode << 3) & 0700, false);
 328         init_sec_ace(&new_ace_list[num_aces+1],
 329                         &global_sid_Creator_Group,
 330                         acltype,
 331                         access_mask,
 332                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 333                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 334                                 SEC_ACE_FLAG_INHERIT_ONLY);
 335         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 336                                 (mode << 6) & 0700, false);
 337         init_sec_ace(&new_ace_list[num_aces+2],
 338                         &global_sid_World,
 339                         acltype,
 340                         access_mask,
 341                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 342                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 343                                 SEC_ACE_FLAG_INHERIT_ONLY);
 344         if (psd->dacl) {
 345                 psd->dacl->aces = new_ace_list;
 346                 psd->dacl->num_aces += 3;
 347                 psd->dacl->size += new_ace_list[num_aces].size +
 348                         new_ace_list[num_aces+1].size +
 349                         new_ace_list[num_aces+2].size;
 350         } else {
 351                 psd->dacl = make_sec_acl(psd,
 352                                 NT4_ACL_REVISION,
 353                                 3,
 354                                 new_ace_list);
 355                 if (psd->dacl == NULL) {
 356                         return NT_STATUS_NO_MEMORY;
 357                 }
 358         }
 359         return NT_STATUS_OK;
 360 }
 361
 362 static NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
 363                                             const char *name,
 364                                             SMB_STRUCT_STAT *psbuf,
 365                                             struct security_descriptor **ppdesc)
 366 {
 367         struct dom_sid owner_sid, group_sid;
 368         size_t size = 0;
 369         struct security_ace aces[4];
 370         uint32_t access_mask = 0;
 371         mode_t mode = psbuf->st_ex_mode;
 372         struct security_acl *new_dacl = NULL;
 373         int idx = 0;
 374
 375         DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
 376                 name, (int)mode ));
 377
 378         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
 379         gid_to_sid(&group_sid, psbuf->st_ex_gid);
 380
 381         /*
 382          We provide up to 4 ACEs
 383                 - Owner
 384                 - Group
 385                 - Everyone
 386                 - NT System
 387         */
 388
 389         if (mode & S_IRUSR) {
 390                 if (mode & S_IWUSR) {
 391                         access_mask |= SEC_RIGHTS_FILE_ALL;
 392                 } else {
 393                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
 394                 }
 395         }
 396         if (mode & S_IWUSR) {
 397                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
 398         }
 399
 400         init_sec_ace(&aces[idx],
 401                         &owner_sid,
 402                         SEC_ACE_TYPE_ACCESS_ALLOWED,
 403                         access_mask,
 404                         0);
 405         idx++;
 406
 407         access_mask = 0;
 408         if (mode & S_IRGRP) {
 409                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
 410         }
 411         if (mode & S_IWGRP) {
 412                 /* note that delete is not granted - this matches posix behaviour */
 413                 access_mask |= SEC_RIGHTS_FILE_WRITE;
 414         }
 415         if (access_mask) {
 416                 init_sec_ace(&aces[idx],
 417                         &group_sid,
 418                         SEC_ACE_TYPE_ACCESS_ALLOWED,
 419                         access_mask,
 420                         0);
 421                 idx++;
 422         }
 423
 424         access_mask = 0;
 425         if (mode & S_IROTH) {
 426                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
 427         }
 428         if (mode & S_IWOTH) {
 429                 access_mask |= SEC_RIGHTS_FILE_WRITE;
 430         }
 431         if (access_mask) {
 432                 init_sec_ace(&aces[idx],
 433                         &global_sid_World,
 434                         SEC_ACE_TYPE_ACCESS_ALLOWED,
 435                         access_mask,
 436                         0);
 437                 idx++;
 438         }
 439
 440         init_sec_ace(&aces[idx],
 441                         &global_sid_System,
 442                         SEC_ACE_TYPE_ACCESS_ALLOWED,
 443                         SEC_RIGHTS_FILE_ALL,
 444                         0);
 445         idx++;
 446
 447         new_dacl = make_sec_acl(ctx,
 448                         NT4_ACL_REVISION,
 449                         idx,
 450                         aces);
 451
 452         if (!new_dacl) {
 453                 return NT_STATUS_NO_MEMORY;
 454         }
 455
 456         *ppdesc = make_sec_desc(ctx,
 457                         SECURITY_DESCRIPTOR_REVISION_1,
 458                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
 459                         &owner_sid,
 460                         &group_sid,
 461                         NULL,
 462                         new_dacl,
 463                         &size);
 464         if (!*ppdesc) {
 465                 return NT_STATUS_NO_MEMORY;
 466         }
 467         return NT_STATUS_OK;
 468 }
 469
 470 /*******************************************************************
 471  Pull a DATA_BLOB from an xattr given a pathname.
 472  If the hash doesn't match, or doesn't exist - return the underlying
 473  filesystem sd.
 474 *******************************************************************/
 475
 476 static NTSTATUS get_nt_acl_internal(vfs_handle_struct *handle,
 477                                     files_struct *fsp,
 478                                     const struct smb_filename *smb_fname_in,
 479                                     uint32_t security_info,
 480                                     TALLOC_CTX *mem_ctx,
 481                                     struct security_descriptor **ppdesc)
 482 {
 483         DATA_BLOB blob = data_blob_null;
 484         NTSTATUS status;
 485         uint16_t hash_type = XATTR_SD_HASH_TYPE_NONE;
 486         uint16_t xattr_version = 0;
 487         uint8_t hash[XATTR_SD_HASH_SIZE];
 488         uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE];
 489         uint8_t hash_tmp[XATTR_SD_HASH_SIZE];
 490         uint8_t sys_acl_hash_tmp[XATTR_SD_HASH_SIZE];
 491         struct security_descriptor *psd_blob = NULL;
 492         struct security_descriptor *psd_fs = NULL;
 493         const struct smb_filename *smb_fname = NULL;
 494         bool ignore_file_system_acl = lp_parm_bool(SNUM(handle->conn),
 495                                                 ACL_MODULE_NAME,
 496                                                 "ignore system acls",
 497                                                 false);
 498         TALLOC_CTX *frame = talloc_stackframe();
 499
 500         if (fsp && smb_fname_in == NULL) {
 501                 smb_fname = fsp->fsp_name;
 502         } else {
 503                 smb_fname = smb_fname_in;
 504         }
 505
 506         DEBUG(10, ("get_nt_acl_internal: name=%s\n", smb_fname->base_name));
 507
 508         status = get_acl_blob(frame, handle, fsp, smb_fname, &blob);
 509         if (!NT_STATUS_IS_OK(status)) {
 510                 DEBUG(10, ("get_nt_acl_internal: get_acl_blob returned %s\n",
 511                         nt_errstr(status)));
 512                 psd_blob = NULL;
 513                 goto out;
 514         } else {
 515                 status = parse_acl_blob(&blob, mem_ctx, &psd_blob,
 516                                         &hash_type, &xattr_version, &hash[0], &sys_acl_hash[0]);
 517                 if (!NT_STATUS_IS_OK(status)) {
 518                         DEBUG(10, ("parse_acl_blob returned %s\n",
 519                                    nt_errstr(status)));
 520                         psd_blob = NULL;
 521                         goto out;
 522                 }
 523         }
 524
 525         /* Ensure we don't leak psd_blob if we don't choose it.
 526          *
 527          * We don't allocate it onto frame as it is preferred not to
 528          * steal from a talloc pool.
 529          */
 530         talloc_steal(frame, psd_blob);
 531
 532         /* determine which type of xattr we got */
 533         switch (xattr_version) {
 534         case 1:
 535         case 2:
 536                 /* These xattr types are unilatteral, they do not
 537                  * require confirmation of the hash.  In particular,
 538                  * the NTVFS file server uses version 1, but
 539                  * 'samba-tool ntacl' can set these as well */
 540                 goto out;
 541         case 3:
 542         case 4:
 543                 if (ignore_file_system_acl) {
 544                         goto out;
 545                 }
 546
 547                 break;
 548         default:
 549                 DEBUG(10, ("get_nt_acl_internal: ACL blob revision "
 550                            "mismatch (%u) for file %s\n",
 551                            (unsigned int)hash_type,
 552                            smb_fname->base_name));
 553                 TALLOC_FREE(psd_blob);
 554                 psd_blob = NULL;
 555                 goto out;
 556         }
 557
 558         /* determine which type of xattr we got */
 559         if (hash_type != XATTR_SD_HASH_TYPE_SHA256) {
 560                 DEBUG(10, ("get_nt_acl_internal: ACL blob hash type "
 561                            "(%u) unexpected for file %s\n",
 562                            (unsigned int)hash_type,
 563                            smb_fname->base_name));
 564                 TALLOC_FREE(psd_blob);
 565                 psd_blob = NULL;
 566                 goto out;
 567         }
 568
 569         /* determine which type of xattr we got */
 570         switch (xattr_version) {
 571         case 4:
 572         {
 573                 int ret;
 574                 char *sys_acl_blob_description;
 575                 DATA_BLOB sys_acl_blob;
 576                 if (fsp) {
 577                         /* Get the full underlying sd, then hash. */
 578                         ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle,
 579                                                                fsp,
 580                                                                frame,
 581                                                                &sys_acl_blob_description,
 582                                                                &sys_acl_blob);
 583                 } else {
 584                         /* Get the full underlying sd, then hash. */
 585                         ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FILE(handle,
 586                                                  smb_fname->base_name,
 587                                                  frame,
 588                                                  &sys_acl_blob_description,
 589                                                  &sys_acl_blob);
 590                 }
 591
 592                 /* If we fail to get the ACL blob (for some reason) then this
 593                  * is not fatal, we just work based on the NT ACL only */
 594                 if (ret == 0) {
 595                         status = hash_blob_sha256(sys_acl_blob, sys_acl_hash_tmp);
 596                         if (!NT_STATUS_IS_OK(status)) {
 597                                 TALLOC_FREE(frame);
 598                                 return status;
 599                         }
 600
 601                         if (memcmp(&sys_acl_hash[0], &sys_acl_hash_tmp[0],
 602                                    XATTR_SD_HASH_SIZE) == 0) {
 603                                 /* Hash matches, return blob sd. */
 604                                 DEBUG(10, ("get_nt_acl_internal: blob hash "
 605                                            "matches for file %s\n",
 606                                            smb_fname->base_name ));
 607                                 goto out;
 608                         }
 609                 }
 610
 611                 /* Otherwise, fall though and see if the NT ACL hash matches */
 612         }
 613         case 3:
 614                 /* Get the full underlying sd for the hash
 615                    or to return as backup. */
 616                 if (fsp) {
 617                         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 618                                                           fsp,
 619                                                           HASH_SECURITY_INFO,
 620                                                           mem_ctx,
 621                                                           &psd_fs);
 622                 } else {
 623                         status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 624                                                          smb_fname,
 625                                                          HASH_SECURITY_INFO,
 626                                                          mem_ctx,
 627                                                          &psd_fs);
 628                 }
 629
 630                 if (!NT_STATUS_IS_OK(status)) {
 631                         DEBUG(10, ("get_nt_acl_internal: get_next_acl for file %s "
 632                                    "returned %s\n",
 633                                    smb_fname->base_name,
 634                                    nt_errstr(status)));
 635                         TALLOC_FREE(frame);
 636                         return status;
 637                 }
 638
 639                 /* Ensure we don't leak psd_fs if we don't choose it.
 640                  *
 641                  * We don't allocate it onto frame as it is preferred not to
 642                  * steal from a talloc pool.
 643                  */
 644                 talloc_steal(frame, psd_fs);
 645
 646                 status = hash_sd_sha256(psd_fs, hash_tmp);
 647                 if (!NT_STATUS_IS_OK(status)) {
 648                         TALLOC_FREE(psd_blob);
 649                         psd_blob = psd_fs;
 650                         goto out;
 651                 }
 652
 653                 if (memcmp(&hash[0], &hash_tmp[0], XATTR_SD_HASH_SIZE) == 0) {
 654                         /* Hash matches, return blob sd. */
 655                         DEBUG(10, ("get_nt_acl_internal: blob hash "
 656                                    "matches for file %s\n",
 657                                    smb_fname->base_name ));
 658                         goto out;
 659                 }
 660
 661                 /* Hash doesn't match, return underlying sd. */
 662                 DEBUG(10, ("get_nt_acl_internal: blob hash "
 663                            "does not match for file %s - returning "
 664                            "file system SD mapping.\n",
 665                            smb_fname->base_name ));
 666
 667                 if (DEBUGLEVEL >= 10) {
 668                         DEBUG(10,("get_nt_acl_internal: acl for blob hash for %s is:\n",
 669                                   smb_fname->base_name ));
 670                         NDR_PRINT_DEBUG(security_descriptor, psd_fs);
 671                 }
 672
 673                 TALLOC_FREE(psd_blob);
 674                 psd_blob = psd_fs;
 675         }
 676   out:
 677
 678         if (psd_blob == NULL) {
 679                 /* Get the full underlying sd, as we failed to get the
 680                  * blob for the hash, or the revision/hash type wasn't
 681                  * known */
 682                 if (fsp) {
 683                         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 684                                                           fsp,
 685                                                           security_info,
 686                                                           mem_ctx,
 687                                                           &psd_fs);
 688                 } else {
 689                         status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 690                                                          smb_fname,
 691                                                          security_info,
 692                                                          mem_ctx,
 693                                                          &psd_fs);
 694                 }
 695
 696                 if (!NT_STATUS_IS_OK(status)) {
 697                         DEBUG(10, ("get_nt_acl_internal: get_next_acl for file %s "
 698                                    "returned %s\n",
 699                                    smb_fname->base_name,
 700                                    nt_errstr(status)));
 701                         TALLOC_FREE(frame);
 702                         return status;
 703                 }
 704
 705                 /* Ensure we don't leak psd_fs if we don't choose it.
 706                  *
 707                  * We don't allocate it onto frame as it is preferred not to
 708                  * steal from a talloc pool.
 709                  */
 710                 talloc_steal(frame, psd_fs);
 711                 psd_blob = psd_fs;
 712         }
 713
 714         if (psd_blob != psd_fs) {
 715                 /* We're returning the blob, throw
 716                  * away the filesystem SD. */
 717                 TALLOC_FREE(psd_fs);
 718         } else {
 719                 SMB_STRUCT_STAT sbuf;
 720                 SMB_STRUCT_STAT *psbuf = &sbuf;
 721                 bool is_directory = false;
 722                 /*
 723                  * We're returning the underlying ACL from the
 724                  * filesystem. If it's a directory, and has no
 725                  * inheritable ACE entries we have to fake them.
 726                  */
 727                 if (fsp) {
 728                         status = vfs_stat_fsp(fsp);
 729                         if (!NT_STATUS_IS_OK(status)) {
 730                                 TALLOC_FREE(frame);
 731                                 return status;
 732                         }
 733                         psbuf = &fsp->fsp_name->st;
 734                 } else {
 735                         /*
 736                          * https://bugzilla.samba.org/show_bug.cgi?id=11249
 737                          *
 738                          * We are currently guaranteed that 'name' here is
 739                          * a smb_fname->base_name, which *cannot* contain
 740                          * a stream name (':'). vfs_stat_smb_fname() splits
 741                          * a name into a base name + stream name, which
 742                          * when we get here we know we've already done.
 743                          * So we have to call the stat or lstat VFS
 744                          * calls directly here. Else, a base_name that
 745                          * contains a ':' (from a demangled name) will
 746                          * get split again.
 747                          *
 748                          * FIXME.
 749                          * This uglyness will go away once smb_fname
 750                          * is fully plumbed through the VFS.
 751                          */
 752                         int ret = vfs_stat_smb_basename(handle->conn,
 753                                                 smb_fname,
 754                                                 &sbuf);
 755                         if (ret == -1) {
 756                                 TALLOC_FREE(frame);
 757                                 return map_nt_error_from_unix(errno);
 758                         }
 759                 }
 760                 is_directory = S_ISDIR(psbuf->st_ex_mode);
 761
 762                 if (ignore_file_system_acl) {
 763                         TALLOC_FREE(psd_fs);
 764                         status = make_default_filesystem_acl(mem_ctx,
 765                                                 smb_fname->base_name,
 766                                                 psbuf,
 767                                                 &psd_blob);
 768                         if (!NT_STATUS_IS_OK(status)) {
 769                                 TALLOC_FREE(frame);
 770                                 return status;
 771                         }
 772                 } else {
 773                         if (is_directory &&
 774                                 !sd_has_inheritable_components(psd_blob,
 775                                                         true)) {
 776                                 status = add_directory_inheritable_components(
 777                                                         handle,
 778                                                         smb_fname->base_name,
 779                                                         psbuf,
 780                                                         psd_blob);
 781                                 if (!NT_STATUS_IS_OK(status)) {
 782                                         TALLOC_FREE(frame);
 783                                         return status;
 784                                 }
 785                         }
 786                         /* The underlying POSIX module always sets
 787                            the ~SEC_DESC_DACL_PROTECTED bit, as ACLs
 788                            can't be inherited in this way under POSIX.
 789                            Remove it for Windows-style ACLs. */
 790                         psd_blob->type &= ~SEC_DESC_DACL_PROTECTED;
 791                 }
 792         }
 793
 794         if (!(security_info & SECINFO_OWNER)) {
 795                 psd_blob->owner_sid = NULL;
 796         }
 797         if (!(security_info & SECINFO_GROUP)) {
 798                 psd_blob->group_sid = NULL;
 799         }
 800         if (!(security_info & SECINFO_DACL)) {
 801                 psd_blob->type &= ~SEC_DESC_DACL_PRESENT;
 802                 psd_blob->dacl = NULL;
 803         }
 804         if (!(security_info & SECINFO_SACL)) {
 805                 psd_blob->type &= ~SEC_DESC_SACL_PRESENT;
 806                 psd_blob->sacl = NULL;
 807         }
 808
 809         TALLOC_FREE(blob.data);
 810
 811         if (DEBUGLEVEL >= 10) {
 812                 DEBUG(10,("get_nt_acl_internal: returning acl for %s is:\n",
 813                         smb_fname->base_name ));
 814                 NDR_PRINT_DEBUG(security_descriptor, psd_blob);
 815         }
 816
 817         /* The VFS API is that the ACL is expected to be on mem_ctx */
 818         *ppdesc = talloc_move(mem_ctx, &psd_blob);
 819
 820         TALLOC_FREE(frame);
 821         return NT_STATUS_OK;
 822 }
 823
 824 /*********************************************************************
 825  Fetch a security descriptor given an fsp.
 826 *********************************************************************/
 827
 828 static NTSTATUS fget_nt_acl_common(vfs_handle_struct *handle,
 829                                    files_struct *fsp,
 830                                    uint32_t security_info,
 831                                    TALLOC_CTX *mem_ctx,
 832                                    struct security_descriptor **ppdesc)
 833 {
 834         return get_nt_acl_internal(handle, fsp,
 835                                    NULL, security_info, mem_ctx, ppdesc);
 836 }
 837
 838 /*********************************************************************
 839  Fetch a security descriptor given a pathname.
 840 *********************************************************************/
 841
 842 static NTSTATUS get_nt_acl_common(vfs_handle_struct *handle,
 843                                   const struct smb_filename *smb_fname,
 844                                   uint32_t security_info,
 845                                   TALLOC_CTX *mem_ctx,
 846                                   struct security_descriptor **ppdesc)
 847 {
 848         return get_nt_acl_internal(handle,
 849                                 NULL,
 850                                 smb_fname,
 851                                 security_info,
 852                                 mem_ctx,
 853                                 ppdesc);
 854 }
 855
 856 /*********************************************************************
 857  Set the underlying ACL (e.g. POSIX ACLS, POSIX owner, etc)
 858 *********************************************************************/
 859 static NTSTATUS set_underlying_acl(vfs_handle_struct *handle, files_struct *fsp,
 860                                    struct security_descriptor *psd,
 861                                    uint32_t security_info_sent,
 862                                    bool chown_needed)
 863 {
 864         NTSTATUS status =
 865             SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 866         if (!NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 867                 return status;
 868         }
 869
 870         /* We got access denied here. If we're already root,
 871            or we didn't need to do a chown, or the fsp isn't
 872            open with WRITE_OWNER access, just return. */
 873         if (get_current_uid(handle->conn) == 0 || chown_needed == false ||
 874             !(fsp->access_mask & SEC_STD_WRITE_OWNER)) {
 875                 return NT_STATUS_ACCESS_DENIED;
 876         }
 877
 878         DEBUG(10, ("fset_nt_acl_common: overriding chown on file %s "
 879                    "for sid %s\n",
 880                    fsp_str_dbg(fsp), sid_string_tos(psd->owner_sid)));
 881
 882         /* Ok, we failed to chown and we have
 883            SEC_STD_WRITE_OWNER access - override. */
 884         become_root();
 885         status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 886         unbecome_root();
 887
 888         return status;
 889 }
 890
 891 /*********************************************************************
 892  Store a v3 security descriptor
 893 *********************************************************************/
 894 static NTSTATUS store_v3_blob(vfs_handle_struct *handle, files_struct *fsp,
 895                               struct security_descriptor *psd,
 896                               struct security_descriptor *pdesc_next,
 897                               uint8_t hash[XATTR_SD_HASH_SIZE])
 898 {
 899         NTSTATUS status;
 900         DATA_BLOB blob;
 901
 902         if (DEBUGLEVEL >= 10) {
 903                 DEBUG(10, ("fset_nt_acl_xattr: storing xattr sd for file %s\n",
 904                            fsp_str_dbg(fsp)));
 905                 NDR_PRINT_DEBUG(
 906                     security_descriptor,
 907                     discard_const_p(struct security_descriptor, psd));
 908
 909                 if (pdesc_next != NULL) {
 910                         DEBUG(10, ("fset_nt_acl_xattr: storing has in xattr sd "
 911                                    "based on \n"));
 912                         NDR_PRINT_DEBUG(
 913                             security_descriptor,
 914                             discard_const_p(struct security_descriptor,
 915                                             pdesc_next));
 916                 } else {
 917                         DEBUG(10,
 918                               ("fset_nt_acl_xattr: ignoring underlying sd\n"));
 919                 }
 920         }
 921         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
 922         if (!NT_STATUS_IS_OK(status)) {
 923                 DEBUG(10, ("fset_nt_acl_xattr: create_acl_blob failed\n"));
 924                 return status;
 925         }
 926
 927         status = store_acl_blob_fsp(handle, fsp, &blob);
 928         return status;
 929 }
 930
 931 /*********************************************************************
 932  Store a security descriptor given an fsp.
 933 *********************************************************************/
 934
 935 static NTSTATUS fset_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
 936         uint32_t security_info_sent, const struct security_descriptor *orig_psd)
 937 {
 938         NTSTATUS status;
 939         int ret;
 940         DATA_BLOB blob, sys_acl_blob;
 941         struct security_descriptor *pdesc_next = NULL;
 942         struct security_descriptor *psd = NULL;
 943         uint8_t hash[XATTR_SD_HASH_SIZE];
 944         uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE];
 945         bool chown_needed = false;
 946         char *sys_acl_description;
 947         TALLOC_CTX *frame = talloc_stackframe();
 948         bool ignore_file_system_acl = lp_parm_bool(
 949             SNUM(handle->conn), ACL_MODULE_NAME, "ignore system acls", false);
 950
 951         if (DEBUGLEVEL >= 10) {
 952                 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
 953                           fsp_str_dbg(fsp)));
 954                 NDR_PRINT_DEBUG(security_descriptor,
 955                         discard_const_p(struct security_descriptor, orig_psd));
 956         }
 957
 958         status = get_nt_acl_internal(handle, fsp,
 959                         NULL,
 960                         SECINFO_OWNER|SECINFO_GROUP|SECINFO_DACL|SECINFO_SACL,
 961                                      frame,
 962                         &psd);
 963
 964         if (!NT_STATUS_IS_OK(status)) {
 965                 TALLOC_FREE(frame);
 966                 return status;
 967         }
 968
 969         psd->revision = orig_psd->revision;
 970         /* All our SD's are self relative. */
 971         psd->type = orig_psd->type | SEC_DESC_SELF_RELATIVE;
 972
 973         if ((security_info_sent & SECINFO_OWNER) && (orig_psd->owner_sid != NULL)) {
 974                 if (!dom_sid_equal(orig_psd->owner_sid, psd->owner_sid)) {
 975                         /* We're changing the owner. */
 976                         chown_needed = true;
 977                 }
 978                 psd->owner_sid = orig_psd->owner_sid;
 979         }
 980         if ((security_info_sent & SECINFO_GROUP) && (orig_psd->group_sid != NULL)) {
 981                 if (!dom_sid_equal(orig_psd->group_sid, psd->group_sid)) {
 982                         /* We're changing the group. */
 983                         chown_needed = true;
 984                 }
 985                 psd->group_sid = orig_psd->group_sid;
 986         }
 987         if (security_info_sent & SECINFO_DACL) {
 988                 if (security_descriptor_with_ms_nfs(orig_psd)) {
 989                         /*
 990                          * If the sd contains a MS NFS SID, do
 991                          * nothing, it's a chmod() request from OS X
 992                          * with AAPL context.
 993                          */
 994                         TALLOC_FREE(frame);
 995                         return NT_STATUS_OK;
 996                 }
 997                 psd->dacl = orig_psd->dacl;
 998                 psd->type |= SEC_DESC_DACL_PRESENT;
 999         }
1000         if (security_info_sent & SECINFO_SACL) {
1001                 psd->sacl = orig_psd->sacl;
1002                 psd->type |= SEC_DESC_SACL_PRESENT;
1003         }
1004
1005         if (ignore_file_system_acl) {
1006                 if (chown_needed) {
1007                         /* send only ownership stuff to lower layer */
1008                         security_info_sent &= (SECINFO_OWNER | SECINFO_GROUP);
1009                         status = set_underlying_acl(handle, fsp, psd,
1010                                                     security_info_sent, true);
1011                         if (!NT_STATUS_IS_OK(status)) {
1012                                 TALLOC_FREE(frame);
1013                                 return status;
1014                         }
1015                 }
1016                 ZERO_ARRAY(hash);
1017                 status = store_v3_blob(handle, fsp, psd, NULL, hash);
1018
1019                 TALLOC_FREE(frame);
1020                 return status;
1021         }
1022
1023         status = set_underlying_acl(handle, fsp, psd, security_info_sent,
1024                                     chown_needed);
1025         if (!NT_STATUS_IS_OK(status)) {
1026                 TALLOC_FREE(frame);
1027                 return status;
1028         }
1029
1030         /* Get the full underlying sd, then hash. */
1031         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
1032                                           fsp,
1033                                           HASH_SECURITY_INFO,
1034                                           frame,
1035                                           &pdesc_next);
1036
1037         if (!NT_STATUS_IS_OK(status)) {
1038                 TALLOC_FREE(frame);
1039                 return status;
1040         }
1041
1042         status = hash_sd_sha256(pdesc_next, hash);
1043         if (!NT_STATUS_IS_OK(status)) {
1044                 TALLOC_FREE(frame);
1045                 return status;
1046         }
1047
1048         /* Get the full underlying sd, then hash. */
1049         ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle,
1050                                                fsp,
1051                                                frame,
1052                                                &sys_acl_description,
1053                                                &sys_acl_blob);
1054
1055         /* If we fail to get the ACL blob (for some reason) then this
1056          * is not fatal, we just work based on the NT ACL only */
1057         if (ret != 0) {
1058                 status = store_v3_blob(handle, fsp, psd, pdesc_next, hash);
1059
1060                 TALLOC_FREE(frame);
1061                 return status;
1062         }
1063
1064         status = hash_blob_sha256(sys_acl_blob, sys_acl_hash);
1065         if (!NT_STATUS_IS_OK(status)) {
1066                 TALLOC_FREE(frame);
1067                 return status;
1068         }
1069
1070         if (DEBUGLEVEL >= 10) {
1071                 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s based on system ACL\n",
1072                           fsp_str_dbg(fsp)));
1073                 NDR_PRINT_DEBUG(security_descriptor,
1074                                 discard_const_p(struct security_descriptor, psd));
1075
1076                 DEBUG(10,("fset_nt_acl_xattr: storing hash in xattr sd based on system ACL and:\n"));
1077                 NDR_PRINT_DEBUG(security_descriptor,
1078                                 discard_const_p(struct security_descriptor, pdesc_next));
1079         }
1080
1081         /* We store hashes of both the sys ACL blob and the NT
1082          * security desciptor mapped from that ACL so as to improve
1083          * our chances against some inadvertant change breaking the
1084          * hash used */
1085         status = create_sys_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash,
1086                                      sys_acl_description, sys_acl_hash);
1087         if (!NT_STATUS_IS_OK(status)) {
1088                 DEBUG(10, ("fset_nt_acl_xattr: create_sys_acl_blob failed\n"));
1089                 TALLOC_FREE(frame);
1090                 return status;
1091         }
1092
1093         status = store_acl_blob_fsp(handle, fsp, &blob);
1094
1095         TALLOC_FREE(frame);
1096         return status;
1097 }
1098
1099 static int acl_common_remove_object(vfs_handle_struct *handle,
1100                                         const char *path,
1101                                         bool is_directory)
1102 {
1103         connection_struct *conn = handle->conn;
1104         struct file_id id;
1105         files_struct *fsp = NULL;
1106         int ret = 0;
1107         char *parent_dir = NULL;
1108         const char *final_component = NULL;
1109         struct smb_filename local_fname;
1110         int saved_errno = 0;
1111         char *saved_dir = NULL;
1112
1113         saved_dir = vfs_GetWd(talloc_tos(),conn);
1114         if (!saved_dir) {
1115                 saved_errno = errno;
1116                 goto out;
1117         }
1118
1119         if (!parent_dirname(talloc_tos(), path,
1120                         &parent_dir, &final_component)) {
1121                 saved_errno = ENOMEM;
1122                 goto out;
1123         }
1124
1125         DEBUG(10,("acl_common_remove_object: removing %s %s/%s\n",
1126                 is_directory ? "directory" : "file",
1127                 parent_dir, final_component ));
1128
1129         /* cd into the parent dir to pin it. */
1130         ret = vfs_ChDir(conn, parent_dir);
1131         if (ret == -1) {
1132                 saved_errno = errno;
1133                 goto out;
1134         }
1135
1136         ZERO_STRUCT(local_fname);
1137         local_fname.base_name = discard_const_p(char, final_component);
1138
1139         /* Must use lstat here. */
1140         ret = SMB_VFS_LSTAT(conn, &local_fname);
1141         if (ret == -1) {
1142                 saved_errno = errno;
1143                 goto out;
1144         }
1145
1146         /* Ensure we have this file open with DELETE access. */
1147         id = vfs_file_id_from_sbuf(conn, &local_fname.st);
1148         for (fsp = file_find_di_first(conn->sconn, id); fsp;
1149                      fsp = file_find_di_next(fsp)) {
1150                 if (fsp->access_mask & DELETE_ACCESS &&
1151                                 fsp->delete_on_close) {
1152                         /* We did open this for delete,
1153                          * allow the delete as root.
1154                          */
1155                         break;
1156                 }
1157         }
1158
1159         if (!fsp) {
1160                 DEBUG(10,("acl_common_remove_object: %s %s/%s "
1161                         "not an open file\n",
1162                         is_directory ? "directory" : "file",
1163                         parent_dir, final_component ));
1164                 saved_errno = EACCES;
1165                 goto out;
1166         }
1167
1168         become_root();
1169         if (is_directory) {
1170                 ret = SMB_VFS_NEXT_RMDIR(handle, &local_fname);
1171         } else {
1172                 ret = SMB_VFS_NEXT_UNLINK(handle, &local_fname);
1173         }
1174         unbecome_root();
1175
1176         if (ret == -1) {
1177                 saved_errno = errno;
1178         }
1179
1180   out:
1181
1182         TALLOC_FREE(parent_dir);
1183
1184         if (saved_dir) {
1185                 vfs_ChDir(conn, saved_dir);
1186         }
1187         if (saved_errno) {
1188                 errno = saved_errno;
1189         }
1190         return ret;
1191 }
1192
1193 static int rmdir_acl_common(struct vfs_handle_struct *handle,
1194                                 const struct smb_filename *smb_fname)
1195 {
1196         int ret;
1197
1198         /* Try the normal rmdir first. */
1199         ret = SMB_VFS_NEXT_RMDIR(handle, smb_fname);
1200         if (ret == 0) {
1201                 return 0;
1202         }
1203         if (errno == EACCES || errno == EPERM) {
1204                 /* Failed due to access denied,
1205                    see if we need to root override. */
1206                 return acl_common_remove_object(handle,
1207                                                 smb_fname->base_name,
1208                                                 true);
1209         }
1210
1211         DEBUG(10,("rmdir_acl_common: unlink of %s failed %s\n",
1212                 smb_fname->base_name,
1213                 strerror(errno) ));
1214         return -1;
1215 }
1216
1217 static int unlink_acl_common(struct vfs_handle_struct *handle,
1218                         const struct smb_filename *smb_fname)
1219 {
1220         int ret;
1221
1222         /* Try the normal unlink first. */
1223         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
1224         if (ret == 0) {
1225                 return 0;
1226         }
1227         if (errno == EACCES || errno == EPERM) {
1228                 /* Failed due to access denied,
1229                    see if we need to root override. */
1230
1231                 /* Don't do anything fancy for streams. */
1232                 if (smb_fname->stream_name) {
1233                         return -1;
1234                 }
1235                 return acl_common_remove_object(handle,
1236                                         smb_fname->base_name,
1237                                         false);
1238         }
1239
1240         DEBUG(10,("unlink_acl_common: unlink of %s failed %s\n",
1241                 smb_fname->base_name,
1242                 strerror(errno) ));
1243         return -1;
1244 }
1245
1246 static int chmod_acl_module_common(struct vfs_handle_struct *handle,
1247                         const struct smb_filename *smb_fname,
1248                         mode_t mode)
1249 {
1250         if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) {
1251                 /* Only allow this on POSIX pathnames. */
1252                 return SMB_VFS_NEXT_CHMOD(handle, smb_fname, mode);
1253         }
1254         return 0;
1255 }
1256
1257 static int fchmod_acl_module_common(struct vfs_handle_struct *handle,
1258                         struct files_struct *fsp, mode_t mode)
1259 {
1260         if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
1261                 /* Only allow this on POSIX opens. */
1262                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1263         }
1264         return 0;
1265 }
1266
1267 static int chmod_acl_acl_module_common(struct vfs_handle_struct *handle,
1268                         const struct smb_filename *smb_fname,
1269                         mode_t mode)
1270 {
1271         if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) {
1272                 /* Only allow this on POSIX pathnames. */
1273                 return SMB_VFS_NEXT_CHMOD_ACL(handle, smb_fname, mode);
1274         }
1275         return 0;
1276 }
1277
1278 static int fchmod_acl_acl_module_common(struct vfs_handle_struct *handle,
1279                         struct files_struct *fsp, mode_t mode)
1280 {
1281         if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
1282                 /* Only allow this on POSIX opens. */
1283                 return SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);
1284         }
1285         return 0;
1286 }