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 = NULL;
 492         struct security_descriptor *psd_blob = NULL;
 493         struct security_descriptor *psd_fs = NULL;
 494         const struct smb_filename *smb_fname = NULL;
 495         bool ignore_file_system_acl = lp_parm_bool(SNUM(handle->conn),
 496                                                 ACL_MODULE_NAME,
 497                                                 "ignore system acls",
 498                                                 false);
 499         char *sys_acl_blob_description = NULL;
 500         DATA_BLOB sys_acl_blob = { 0 };
 501         bool psd_is_from_fs = false;
 502
 503         if (fsp && smb_fname_in == NULL) {
 504                 smb_fname = fsp->fsp_name;
 505         } else {
 506                 smb_fname = smb_fname_in;
 507         }
 508
 509         DEBUG(10, ("get_nt_acl_internal: name=%s\n", smb_fname->base_name));
 510
 511         status = get_acl_blob(mem_ctx, handle, fsp, smb_fname, &blob);
 512         if (!NT_STATUS_IS_OK(status)) {
 513                 DEBUG(10, ("get_nt_acl_internal: get_acl_blob returned %s\n",
 514                         nt_errstr(status)));
 515                 goto out;
 516         } else {
 517                 status = parse_acl_blob(&blob, mem_ctx, &psd_blob,
 518                                         &hash_type, &xattr_version, &hash[0], &sys_acl_hash[0]);
 519                 if (!NT_STATUS_IS_OK(status)) {
 520                         DEBUG(10, ("parse_acl_blob returned %s\n",
 521                                    nt_errstr(status)));
 522                         TALLOC_FREE(blob.data);
 523                         goto out;
 524                 }
 525         }
 526
 527         TALLOC_FREE(blob.data);
 528
 529         /* determine which type of xattr we got */
 530         switch (xattr_version) {
 531         case 1:
 532         case 2:
 533                 /* These xattr types are unilatteral, they do not
 534                  * require confirmation of the hash.  In particular,
 535                  * the NTVFS file server uses version 1, but
 536                  * 'samba-tool ntacl' can set these as well */
 537                 psd = psd_blob;
 538                 psd_blob = NULL;
 539                 goto out;
 540         case 3:
 541         case 4:
 542                 if (ignore_file_system_acl) {
 543                         psd = psd_blob;
 544                         psd_blob = NULL;
 545                         goto out;
 546                 }
 547
 548                 break;
 549         default:
 550                 DEBUG(10, ("get_nt_acl_internal: ACL blob revision "
 551                            "mismatch (%u) for file %s\n",
 552                            (unsigned int)hash_type,
 553                            smb_fname->base_name));
 554                 TALLOC_FREE(psd_blob);
 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                 goto out;
 566         }
 567
 568         /* determine which type of xattr we got */
 569         switch (xattr_version) {
 570         case 4:
 571         {
 572                 int ret;
 573                 if (fsp) {
 574                         /* Get the full underlying sd, then hash. */
 575                         ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle,
 576                                                                fsp,
 577                                                                mem_ctx,
 578                                                                &sys_acl_blob_description,
 579                                                                &sys_acl_blob);
 580                 } else {
 581                         /* Get the full underlying sd, then hash. */
 582                         ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FILE(handle,
 583                                                  smb_fname->base_name,
 584                                                  mem_ctx,
 585                                                  &sys_acl_blob_description,
 586                                                  &sys_acl_blob);
 587                 }
 588
 589                 /* If we fail to get the ACL blob (for some reason) then this
 590                  * is not fatal, we just work based on the NT ACL only */
 591                 if (ret == 0) {
 592                         status = hash_blob_sha256(sys_acl_blob, sys_acl_hash_tmp);
 593                         if (!NT_STATUS_IS_OK(status)) {
 594                                 goto fail;
 595                         }
 596
 597                         TALLOC_FREE(sys_acl_blob_description);
 598                         TALLOC_FREE(sys_acl_blob.data);
 599
 600                         if (memcmp(&sys_acl_hash[0], &sys_acl_hash_tmp[0],
 601                                    XATTR_SD_HASH_SIZE) == 0) {
 602                                 /* Hash matches, return blob sd. */
 603                                 DEBUG(10, ("get_nt_acl_internal: blob hash "
 604                                            "matches for file %s\n",
 605                                            smb_fname->base_name ));
 606                                 psd = psd_blob;
 607                                 psd_blob = NULL;
 608                                 goto out;
 609                         }
 610                 }
 611
 612                 /* Otherwise, fall though and see if the NT ACL hash matches */
 613         }
 614         case 3:
 615                 /* Get the full underlying sd for the hash
 616                    or to return as backup. */
 617                 if (fsp) {
 618                         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 619                                                           fsp,
 620                                                           HASH_SECURITY_INFO,
 621                                                           mem_ctx,
 622                                                           &psd_fs);
 623                 } else {
 624                         status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 625                                                          smb_fname,
 626                                                          HASH_SECURITY_INFO,
 627                                                          mem_ctx,
 628                                                          &psd_fs);
 629                 }
 630
 631                 if (!NT_STATUS_IS_OK(status)) {
 632                         DEBUG(10, ("get_nt_acl_internal: get_next_acl for file %s "
 633                                    "returned %s\n",
 634                                    smb_fname->base_name,
 635                                    nt_errstr(status)));
 636                         goto fail;
 637                 }
 638
 639                 status = hash_sd_sha256(psd_fs, hash_tmp);
 640                 if (!NT_STATUS_IS_OK(status)) {
 641                         TALLOC_FREE(psd_blob);
 642                         psd = psd_fs;
 643                         psd_fs = NULL;
 644                         psd_is_from_fs = true;
 645                         goto out;
 646                 }
 647
 648                 if (memcmp(&hash[0], &hash_tmp[0], XATTR_SD_HASH_SIZE) == 0) {
 649                         /* Hash matches, return blob sd. */
 650                         DEBUG(10, ("get_nt_acl_internal: blob hash "
 651                                    "matches for file %s\n",
 652                                    smb_fname->base_name ));
 653                         psd = psd_blob;
 654                         psd_blob = NULL;
 655                         goto out;
 656                 }
 657
 658                 /* Hash doesn't match, return underlying sd. */
 659                 DEBUG(10, ("get_nt_acl_internal: blob hash "
 660                            "does not match for file %s - returning "
 661                            "file system SD mapping.\n",
 662                            smb_fname->base_name ));
 663
 664                 if (DEBUGLEVEL >= 10) {
 665                         DEBUG(10,("get_nt_acl_internal: acl for blob hash for %s is:\n",
 666                                   smb_fname->base_name ));
 667                         NDR_PRINT_DEBUG(security_descriptor, psd_fs);
 668                 }
 669
 670                 TALLOC_FREE(psd_blob);
 671                 psd = psd_fs;
 672                 psd_fs = NULL;
 673                 psd_is_from_fs = true;
 674         }
 675
 676 out:
 677         if (psd == NULL) {
 678                 /* Get the full underlying sd, as we failed to get the
 679                  * blob for the hash, or the revision/hash type wasn't
 680                  * known */
 681                 if (fsp) {
 682                         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 683                                                           fsp,
 684                                                           security_info,
 685                                                           mem_ctx,
 686                                                           &psd);
 687                 } else {
 688                         status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 689                                                          smb_fname,
 690                                                          security_info,
 691                                                          mem_ctx,
 692                                                          &psd);
 693                 }
 694
 695                 if (!NT_STATUS_IS_OK(status)) {
 696                         DEBUG(10, ("get_nt_acl_internal: get_next_acl for file %s "
 697                                    "returned %s\n",
 698                                    smb_fname->base_name,
 699                                    nt_errstr(status)));
 700                         goto fail;
 701                 }
 702
 703                 psd_is_from_fs = true;
 704         }
 705
 706         if (psd_is_from_fs) {
 707                 SMB_STRUCT_STAT sbuf;
 708                 SMB_STRUCT_STAT *psbuf = &sbuf;
 709                 bool is_directory = false;
 710                 /*
 711                  * We're returning the underlying ACL from the
 712                  * filesystem. If it's a directory, and has no
 713                  * inheritable ACE entries we have to fake them.
 714                  */
 715                 if (fsp) {
 716                         status = vfs_stat_fsp(fsp);
 717                         if (!NT_STATUS_IS_OK(status)) {
 718                                 goto fail;
 719                         }
 720                         psbuf = &fsp->fsp_name->st;
 721                 } else {
 722                         /*
 723                          * https://bugzilla.samba.org/show_bug.cgi?id=11249
 724                          *
 725                          * We are currently guaranteed that 'name' here is
 726                          * a smb_fname->base_name, which *cannot* contain
 727                          * a stream name (':'). vfs_stat_smb_fname() splits
 728                          * a name into a base name + stream name, which
 729                          * when we get here we know we've already done.
 730                          * So we have to call the stat or lstat VFS
 731                          * calls directly here. Else, a base_name that
 732                          * contains a ':' (from a demangled name) will
 733                          * get split again.
 734                          *
 735                          * FIXME.
 736                          * This uglyness will go away once smb_fname
 737                          * is fully plumbed through the VFS.
 738                          */
 739                         int ret = vfs_stat_smb_basename(handle->conn,
 740                                                 smb_fname,
 741                                                 &sbuf);
 742                         if (ret == -1) {
 743                                 status = map_nt_error_from_unix(errno);
 744                                 goto fail;
 745                         }
 746                 }
 747                 is_directory = S_ISDIR(psbuf->st_ex_mode);
 748
 749                 if (ignore_file_system_acl) {
 750                         TALLOC_FREE(psd);
 751                         status = make_default_filesystem_acl(mem_ctx,
 752                                                 smb_fname->base_name,
 753                                                 psbuf,
 754                                                 &psd);
 755                         if (!NT_STATUS_IS_OK(status)) {
 756                                 goto fail;
 757                         }
 758                 } else {
 759                         if (is_directory &&
 760                                 !sd_has_inheritable_components(psd,
 761                                                         true)) {
 762                                 status = add_directory_inheritable_components(
 763                                                         handle,
 764                                                         smb_fname->base_name,
 765                                                         psbuf,
 766                                                         psd);
 767                                 if (!NT_STATUS_IS_OK(status)) {
 768                                         goto fail;
 769                                 }
 770                         }
 771                         /* The underlying POSIX module always sets
 772                            the ~SEC_DESC_DACL_PROTECTED bit, as ACLs
 773                            can't be inherited in this way under POSIX.
 774                            Remove it for Windows-style ACLs. */
 775                         psd->type &= ~SEC_DESC_DACL_PROTECTED;
 776                 }
 777         }
 778
 779         if (!(security_info & SECINFO_OWNER)) {
 780                 psd->owner_sid = NULL;
 781         }
 782         if (!(security_info & SECINFO_GROUP)) {
 783                 psd->group_sid = NULL;
 784         }
 785         if (!(security_info & SECINFO_DACL)) {
 786                 psd->type &= ~SEC_DESC_DACL_PRESENT;
 787                 psd->dacl = NULL;
 788         }
 789         if (!(security_info & SECINFO_SACL)) {
 790                 psd->type &= ~SEC_DESC_SACL_PRESENT;
 791                 psd->sacl = NULL;
 792         }
 793
 794         if (DEBUGLEVEL >= 10) {
 795                 DEBUG(10,("get_nt_acl_internal: returning acl for %s is:\n",
 796                         smb_fname->base_name ));
 797                 NDR_PRINT_DEBUG(security_descriptor, psd);
 798         }
 799
 800         *ppdesc = psd;
 801
 802         return NT_STATUS_OK;
 803
 804 fail:
 805         TALLOC_FREE(psd);
 806         TALLOC_FREE(psd_blob);
 807         TALLOC_FREE(psd_fs);
 808         TALLOC_FREE(sys_acl_blob_description);
 809         TALLOC_FREE(sys_acl_blob.data);
 810         return status;
 811 }
 812
 813 /*********************************************************************
 814  Fetch a security descriptor given an fsp.
 815 *********************************************************************/
 816
 817 static NTSTATUS fget_nt_acl_common(vfs_handle_struct *handle,
 818                                    files_struct *fsp,
 819                                    uint32_t security_info,
 820                                    TALLOC_CTX *mem_ctx,
 821                                    struct security_descriptor **ppdesc)
 822 {
 823         return get_nt_acl_internal(handle, fsp,
 824                                    NULL, security_info, mem_ctx, ppdesc);
 825 }
 826
 827 /*********************************************************************
 828  Fetch a security descriptor given a pathname.
 829 *********************************************************************/
 830
 831 static NTSTATUS get_nt_acl_common(vfs_handle_struct *handle,
 832                                   const struct smb_filename *smb_fname,
 833                                   uint32_t security_info,
 834                                   TALLOC_CTX *mem_ctx,
 835                                   struct security_descriptor **ppdesc)
 836 {
 837         return get_nt_acl_internal(handle,
 838                                 NULL,
 839                                 smb_fname,
 840                                 security_info,
 841                                 mem_ctx,
 842                                 ppdesc);
 843 }
 844
 845 /*********************************************************************
 846  Set the underlying ACL (e.g. POSIX ACLS, POSIX owner, etc)
 847 *********************************************************************/
 848 static NTSTATUS set_underlying_acl(vfs_handle_struct *handle, files_struct *fsp,
 849                                    struct security_descriptor *psd,
 850                                    uint32_t security_info_sent,
 851                                    bool chown_needed)
 852 {
 853         NTSTATUS status =
 854             SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 855         if (!NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 856                 return status;
 857         }
 858
 859         /* We got access denied here. If we're already root,
 860            or we didn't need to do a chown, or the fsp isn't
 861            open with WRITE_OWNER access, just return. */
 862         if (get_current_uid(handle->conn) == 0 || chown_needed == false ||
 863             !(fsp->access_mask & SEC_STD_WRITE_OWNER)) {
 864                 return NT_STATUS_ACCESS_DENIED;
 865         }
 866
 867         DEBUG(10, ("fset_nt_acl_common: overriding chown on file %s "
 868                    "for sid %s\n",
 869                    fsp_str_dbg(fsp), sid_string_tos(psd->owner_sid)));
 870
 871         /* Ok, we failed to chown and we have
 872            SEC_STD_WRITE_OWNER access - override. */
 873         become_root();
 874         status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 875         unbecome_root();
 876
 877         return status;
 878 }
 879
 880 /*********************************************************************
 881  Store a v3 security descriptor
 882 *********************************************************************/
 883 static NTSTATUS store_v3_blob(vfs_handle_struct *handle, files_struct *fsp,
 884                               struct security_descriptor *psd,
 885                               struct security_descriptor *pdesc_next,
 886                               uint8_t hash[XATTR_SD_HASH_SIZE])
 887 {
 888         NTSTATUS status;
 889         DATA_BLOB blob;
 890
 891         if (DEBUGLEVEL >= 10) {
 892                 DEBUG(10, ("fset_nt_acl_xattr: storing xattr sd for file %s\n",
 893                            fsp_str_dbg(fsp)));
 894                 NDR_PRINT_DEBUG(
 895                     security_descriptor,
 896                     discard_const_p(struct security_descriptor, psd));
 897
 898                 if (pdesc_next != NULL) {
 899                         DEBUG(10, ("fset_nt_acl_xattr: storing has in xattr sd "
 900                                    "based on \n"));
 901                         NDR_PRINT_DEBUG(
 902                             security_descriptor,
 903                             discard_const_p(struct security_descriptor,
 904                                             pdesc_next));
 905                 } else {
 906                         DEBUG(10,
 907                               ("fset_nt_acl_xattr: ignoring underlying sd\n"));
 908                 }
 909         }
 910         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
 911         if (!NT_STATUS_IS_OK(status)) {
 912                 DEBUG(10, ("fset_nt_acl_xattr: create_acl_blob failed\n"));
 913                 return status;
 914         }
 915
 916         status = store_acl_blob_fsp(handle, fsp, &blob);
 917         return status;
 918 }
 919
 920 /*********************************************************************
 921  Store a security descriptor given an fsp.
 922 *********************************************************************/
 923
 924 static NTSTATUS fset_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
 925         uint32_t security_info_sent, const struct security_descriptor *orig_psd)
 926 {
 927         NTSTATUS status;
 928         int ret;
 929         DATA_BLOB blob, sys_acl_blob;
 930         struct security_descriptor *pdesc_next = NULL;
 931         struct security_descriptor *psd = NULL;
 932         uint8_t hash[XATTR_SD_HASH_SIZE];
 933         uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE];
 934         bool chown_needed = false;
 935         char *sys_acl_description;
 936         TALLOC_CTX *frame = talloc_stackframe();
 937         bool ignore_file_system_acl = lp_parm_bool(
 938             SNUM(handle->conn), ACL_MODULE_NAME, "ignore system acls", false);
 939
 940         if (DEBUGLEVEL >= 10) {
 941                 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
 942                           fsp_str_dbg(fsp)));
 943                 NDR_PRINT_DEBUG(security_descriptor,
 944                         discard_const_p(struct security_descriptor, orig_psd));
 945         }
 946
 947         status = get_nt_acl_internal(handle, fsp,
 948                         NULL,
 949                         SECINFO_OWNER|SECINFO_GROUP|SECINFO_DACL|SECINFO_SACL,
 950                                      frame,
 951                         &psd);
 952
 953         if (!NT_STATUS_IS_OK(status)) {
 954                 TALLOC_FREE(frame);
 955                 return status;
 956         }
 957
 958         psd->revision = orig_psd->revision;
 959         /* All our SD's are self relative. */
 960         psd->type = orig_psd->type | SEC_DESC_SELF_RELATIVE;
 961
 962         if ((security_info_sent & SECINFO_OWNER) && (orig_psd->owner_sid != NULL)) {
 963                 if (!dom_sid_equal(orig_psd->owner_sid, psd->owner_sid)) {
 964                         /* We're changing the owner. */
 965                         chown_needed = true;
 966                 }
 967                 psd->owner_sid = orig_psd->owner_sid;
 968         }
 969         if ((security_info_sent & SECINFO_GROUP) && (orig_psd->group_sid != NULL)) {
 970                 if (!dom_sid_equal(orig_psd->group_sid, psd->group_sid)) {
 971                         /* We're changing the group. */
 972                         chown_needed = true;
 973                 }
 974                 psd->group_sid = orig_psd->group_sid;
 975         }
 976         if (security_info_sent & SECINFO_DACL) {
 977                 if (security_descriptor_with_ms_nfs(orig_psd)) {
 978                         /*
 979                          * If the sd contains a MS NFS SID, do
 980                          * nothing, it's a chmod() request from OS X
 981                          * with AAPL context.
 982                          */
 983                         TALLOC_FREE(frame);
 984                         return NT_STATUS_OK;
 985                 }
 986                 psd->dacl = orig_psd->dacl;
 987                 psd->type |= SEC_DESC_DACL_PRESENT;
 988         }
 989         if (security_info_sent & SECINFO_SACL) {
 990                 psd->sacl = orig_psd->sacl;
 991                 psd->type |= SEC_DESC_SACL_PRESENT;
 992         }
 993
 994         if (ignore_file_system_acl) {
 995                 if (chown_needed) {
 996                         /* send only ownership stuff to lower layer */
 997                         security_info_sent &= (SECINFO_OWNER | SECINFO_GROUP);
 998                         status = set_underlying_acl(handle, fsp, psd,
 999                                                     security_info_sent, true);
1000                         if (!NT_STATUS_IS_OK(status)) {
1001                                 TALLOC_FREE(frame);
1002                                 return status;
1003                         }
1004                 }
1005                 ZERO_ARRAY(hash);
1006                 status = store_v3_blob(handle, fsp, psd, NULL, hash);
1007
1008                 TALLOC_FREE(frame);
1009                 return status;
1010         }
1011
1012         status = set_underlying_acl(handle, fsp, psd, security_info_sent,
1013                                     chown_needed);
1014         if (!NT_STATUS_IS_OK(status)) {
1015                 TALLOC_FREE(frame);
1016                 return status;
1017         }
1018
1019         /* Get the full underlying sd, then hash. */
1020         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
1021                                           fsp,
1022                                           HASH_SECURITY_INFO,
1023                                           frame,
1024                                           &pdesc_next);
1025
1026         if (!NT_STATUS_IS_OK(status)) {
1027                 TALLOC_FREE(frame);
1028                 return status;
1029         }
1030
1031         status = hash_sd_sha256(pdesc_next, hash);
1032         if (!NT_STATUS_IS_OK(status)) {
1033                 TALLOC_FREE(frame);
1034                 return status;
1035         }
1036
1037         /* Get the full underlying sd, then hash. */
1038         ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle,
1039                                                fsp,
1040                                                frame,
1041                                                &sys_acl_description,
1042                                                &sys_acl_blob);
1043
1044         /* If we fail to get the ACL blob (for some reason) then this
1045          * is not fatal, we just work based on the NT ACL only */
1046         if (ret != 0) {
1047                 status = store_v3_blob(handle, fsp, psd, pdesc_next, hash);
1048
1049                 TALLOC_FREE(frame);
1050                 return status;
1051         }
1052
1053         status = hash_blob_sha256(sys_acl_blob, sys_acl_hash);
1054         if (!NT_STATUS_IS_OK(status)) {
1055                 TALLOC_FREE(frame);
1056                 return status;
1057         }
1058
1059         if (DEBUGLEVEL >= 10) {
1060                 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s based on system ACL\n",
1061                           fsp_str_dbg(fsp)));
1062                 NDR_PRINT_DEBUG(security_descriptor,
1063                                 discard_const_p(struct security_descriptor, psd));
1064
1065                 DEBUG(10,("fset_nt_acl_xattr: storing hash in xattr sd based on system ACL and:\n"));
1066                 NDR_PRINT_DEBUG(security_descriptor,
1067                                 discard_const_p(struct security_descriptor, pdesc_next));
1068         }
1069
1070         /* We store hashes of both the sys ACL blob and the NT
1071          * security desciptor mapped from that ACL so as to improve
1072          * our chances against some inadvertant change breaking the
1073          * hash used */
1074         status = create_sys_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash,
1075                                      sys_acl_description, sys_acl_hash);
1076         if (!NT_STATUS_IS_OK(status)) {
1077                 DEBUG(10, ("fset_nt_acl_xattr: create_sys_acl_blob failed\n"));
1078                 TALLOC_FREE(frame);
1079                 return status;
1080         }
1081
1082         status = store_acl_blob_fsp(handle, fsp, &blob);
1083
1084         TALLOC_FREE(frame);
1085         return status;
1086 }
1087
1088 static int acl_common_remove_object(vfs_handle_struct *handle,
1089                                         const char *path,
1090                                         bool is_directory)
1091 {
1092         connection_struct *conn = handle->conn;
1093         struct file_id id;
1094         files_struct *fsp = NULL;
1095         int ret = 0;
1096         char *parent_dir = NULL;
1097         const char *final_component = NULL;
1098         struct smb_filename local_fname;
1099         int saved_errno = 0;
1100         char *saved_dir = NULL;
1101
1102         saved_dir = vfs_GetWd(talloc_tos(),conn);
1103         if (!saved_dir) {
1104                 saved_errno = errno;
1105                 goto out;
1106         }
1107
1108         if (!parent_dirname(talloc_tos(), path,
1109                         &parent_dir, &final_component)) {
1110                 saved_errno = ENOMEM;
1111                 goto out;
1112         }
1113
1114         DEBUG(10,("acl_common_remove_object: removing %s %s/%s\n",
1115                 is_directory ? "directory" : "file",
1116                 parent_dir, final_component ));
1117
1118         /* cd into the parent dir to pin it. */
1119         ret = vfs_ChDir(conn, parent_dir);
1120         if (ret == -1) {
1121                 saved_errno = errno;
1122                 goto out;
1123         }
1124
1125         ZERO_STRUCT(local_fname);
1126         local_fname.base_name = discard_const_p(char, final_component);
1127
1128         /* Must use lstat here. */
1129         ret = SMB_VFS_LSTAT(conn, &local_fname);
1130         if (ret == -1) {
1131                 saved_errno = errno;
1132                 goto out;
1133         }
1134
1135         /* Ensure we have this file open with DELETE access. */
1136         id = vfs_file_id_from_sbuf(conn, &local_fname.st);
1137         for (fsp = file_find_di_first(conn->sconn, id); fsp;
1138                      fsp = file_find_di_next(fsp)) {
1139                 if (fsp->access_mask & DELETE_ACCESS &&
1140                                 fsp->delete_on_close) {
1141                         /* We did open this for delete,
1142                          * allow the delete as root.
1143                          */
1144                         break;
1145                 }
1146         }
1147
1148         if (!fsp) {
1149                 DEBUG(10,("acl_common_remove_object: %s %s/%s "
1150                         "not an open file\n",
1151                         is_directory ? "directory" : "file",
1152                         parent_dir, final_component ));
1153                 saved_errno = EACCES;
1154                 goto out;
1155         }
1156
1157         become_root();
1158         if (is_directory) {
1159                 ret = SMB_VFS_NEXT_RMDIR(handle, &local_fname);
1160         } else {
1161                 ret = SMB_VFS_NEXT_UNLINK(handle, &local_fname);
1162         }
1163         unbecome_root();
1164
1165         if (ret == -1) {
1166                 saved_errno = errno;
1167         }
1168
1169   out:
1170
1171         TALLOC_FREE(parent_dir);
1172
1173         if (saved_dir) {
1174                 vfs_ChDir(conn, saved_dir);
1175         }
1176         if (saved_errno) {
1177                 errno = saved_errno;
1178         }
1179         return ret;
1180 }
1181
1182 static int rmdir_acl_common(struct vfs_handle_struct *handle,
1183                                 const struct smb_filename *smb_fname)
1184 {
1185         int ret;
1186
1187         /* Try the normal rmdir first. */
1188         ret = SMB_VFS_NEXT_RMDIR(handle, smb_fname);
1189         if (ret == 0) {
1190                 return 0;
1191         }
1192         if (errno == EACCES || errno == EPERM) {
1193                 /* Failed due to access denied,
1194                    see if we need to root override. */
1195                 return acl_common_remove_object(handle,
1196                                                 smb_fname->base_name,
1197                                                 true);
1198         }
1199
1200         DEBUG(10,("rmdir_acl_common: unlink of %s failed %s\n",
1201                 smb_fname->base_name,
1202                 strerror(errno) ));
1203         return -1;
1204 }
1205
1206 static int unlink_acl_common(struct vfs_handle_struct *handle,
1207                         const struct smb_filename *smb_fname)
1208 {
1209         int ret;
1210
1211         /* Try the normal unlink first. */
1212         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
1213         if (ret == 0) {
1214                 return 0;
1215         }
1216         if (errno == EACCES || errno == EPERM) {
1217                 /* Failed due to access denied,
1218                    see if we need to root override. */
1219
1220                 /* Don't do anything fancy for streams. */
1221                 if (smb_fname->stream_name) {
1222                         return -1;
1223                 }
1224                 return acl_common_remove_object(handle,
1225                                         smb_fname->base_name,
1226                                         false);
1227         }
1228
1229         DEBUG(10,("unlink_acl_common: unlink of %s failed %s\n",
1230                 smb_fname->base_name,
1231                 strerror(errno) ));
1232         return -1;
1233 }
1234
1235 static int chmod_acl_module_common(struct vfs_handle_struct *handle,
1236                         const struct smb_filename *smb_fname,
1237                         mode_t mode)
1238 {
1239         if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) {
1240                 /* Only allow this on POSIX pathnames. */
1241                 return SMB_VFS_NEXT_CHMOD(handle, smb_fname, mode);
1242         }
1243         return 0;
1244 }
1245
1246 static int fchmod_acl_module_common(struct vfs_handle_struct *handle,
1247                         struct files_struct *fsp, mode_t mode)
1248 {
1249         if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
1250                 /* Only allow this on POSIX opens. */
1251                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1252         }
1253         return 0;
1254 }
1255
1256 static int chmod_acl_acl_module_common(struct vfs_handle_struct *handle,
1257                         const struct smb_filename *smb_fname,
1258                         mode_t mode)
1259 {
1260         if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) {
1261                 /* Only allow this on POSIX pathnames. */
1262                 return SMB_VFS_NEXT_CHMOD_ACL(handle, smb_fname, mode);
1263         }
1264         return 0;
1265 }
1266
1267 static int fchmod_acl_acl_module_common(struct vfs_handle_struct *handle,
1268                         struct files_struct *fsp, mode_t mode)
1269 {
1270         if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
1271                 /* Only allow this on POSIX opens. */
1272                 return SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);
1273         }
1274         return 0;
1275 }