source3/modules/vfs_acl_common.c

   1 /*
   2  * Store Windows ACLs in data store - common functions.
   3  * #included into modules/vfs_acl_xattr.c and modules/vfs_acl_tdb.c
   4  *
   5  * Copyright (C) Volker Lendecke, 2008
   6  * Copyright (C) Jeremy Allison, 2009
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "smbd/smbd.h"
  23 #include "system/filesys.h"
  24 #include "../libcli/security/security.h"
  25 #include "../librpc/gen_ndr/ndr_security.h"
  26 #include "../lib/util/bitmap.h"
  27
  28 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
  29                         DATA_BLOB *pblob,
  30                         uint16_t hash_type,
  31                         uint8_t hash[XATTR_SD_HASH_SIZE]);
  32
  33 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
  34                         vfs_handle_struct *handle,
  35                         files_struct *fsp,
  36                         const char *name,
  37                         DATA_BLOB *pblob);
  38
  39 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
  40                         files_struct *fsp,
  41                         DATA_BLOB *pblob);
  42
  43 #define HASH_SECURITY_INFO (SECINFO_OWNER | \
  44                                 SECINFO_GROUP | \
  45                                 SECINFO_DACL | \
  46                                 SECINFO_SACL)
  47
  48 /*******************************************************************
  49  Hash a security descriptor.
  50 *******************************************************************/
  51
  52 static NTSTATUS hash_sd_sha256(struct security_descriptor *psd,
  53                         uint8_t *hash)
  54 {
  55         DATA_BLOB blob;
  56         SHA256_CTX tctx;
  57         NTSTATUS status;
  58
  59         memset(hash, '\0', XATTR_SD_HASH_SIZE);
  60         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
  61         if (!NT_STATUS_IS_OK(status)) {
  62                 return status;
  63         }
  64
  65         samba_SHA256_Init(&tctx);
  66         samba_SHA256_Update(&tctx, blob.data, blob.length);
  67         samba_SHA256_Final(hash, &tctx);
  68
  69         return NT_STATUS_OK;
  70 }
  71
  72 /*******************************************************************
  73  Parse out a struct security_descriptor from a DATA_BLOB.
  74 *******************************************************************/
  75
  76 static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
  77                                 struct security_descriptor **ppdesc,
  78                                 uint16_t *p_hash_type,
  79                                 uint8_t hash[XATTR_SD_HASH_SIZE])
  80 {
  81         TALLOC_CTX *ctx = talloc_tos();
  82         struct xattr_NTACL xacl;
  83         enum ndr_err_code ndr_err;
  84         size_t sd_size;
  85
  86         ndr_err = ndr_pull_struct_blob(pblob, ctx, &xacl,
  87                         (ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
  88
  89         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  90                 DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
  91                         ndr_errstr(ndr_err)));
  92                 return ndr_map_error2ntstatus(ndr_err);
  93         }
  94
  95         switch (xacl.version) {
  96                 case 1:
  97                         *ppdesc = make_sec_desc(ctx, SD_REVISION,
  98                                         xacl.info.sd->type | SEC_DESC_SELF_RELATIVE,
  99                                         xacl.info.sd->owner_sid,
 100                                         xacl.info.sd->group_sid,
 101                                         xacl.info.sd->sacl,
 102                                         xacl.info.sd->dacl,
 103                                         &sd_size);
 104                         /* No hash - null out. */
 105                         *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
 106                         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 107                         break;
 108                 case 2:
 109                         *ppdesc = make_sec_desc(ctx, SD_REVISION,
 110                                         xacl.info.sd_hs2->sd->type | SEC_DESC_SELF_RELATIVE,
 111                                         xacl.info.sd_hs2->sd->owner_sid,
 112                                         xacl.info.sd_hs2->sd->group_sid,
 113                                         xacl.info.sd_hs2->sd->sacl,
 114                                         xacl.info.sd_hs2->sd->dacl,
 115                                         &sd_size);
 116                         /* No hash - null out. */
 117                         *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
 118                         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 119                         break;
 120                 case 3:
 121                         *ppdesc = make_sec_desc(ctx, SD_REVISION,
 122                                         xacl.info.sd_hs3->sd->type | SEC_DESC_SELF_RELATIVE,
 123                                         xacl.info.sd_hs3->sd->owner_sid,
 124                                         xacl.info.sd_hs3->sd->group_sid,
 125                                         xacl.info.sd_hs3->sd->sacl,
 126                                         xacl.info.sd_hs3->sd->dacl,
 127                                         &sd_size);
 128                         *p_hash_type = xacl.info.sd_hs3->hash_type;
 129                         /* Current version 3. */
 130                         memcpy(hash, xacl.info.sd_hs3->hash, XATTR_SD_HASH_SIZE);
 131                         break;
 132                 default:
 133                         return NT_STATUS_REVISION_MISMATCH;
 134         }
 135
 136         TALLOC_FREE(xacl.info.sd);
 137
 138         return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
 139 }
 140
 141 /*******************************************************************
 142  Create a DATA_BLOB from a security descriptor.
 143 *******************************************************************/
 144
 145 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
 146                         DATA_BLOB *pblob,
 147                         uint16_t hash_type,
 148                         uint8_t hash[XATTR_SD_HASH_SIZE])
 149 {
 150         struct xattr_NTACL xacl;
 151         struct security_descriptor_hash_v3 sd_hs3;
 152         enum ndr_err_code ndr_err;
 153         TALLOC_CTX *ctx = talloc_tos();
 154
 155         ZERO_STRUCT(xacl);
 156         ZERO_STRUCT(sd_hs3);
 157
 158         xacl.version = 3;
 159         xacl.info.sd_hs3 = &sd_hs3;
 160         xacl.info.sd_hs3->sd = discard_const_p(struct security_descriptor, psd);
 161         xacl.info.sd_hs3->hash_type = hash_type;
 162         memcpy(&xacl.info.sd_hs3->hash[0], hash, XATTR_SD_HASH_SIZE);
 163
 164         ndr_err = ndr_push_struct_blob(
 165                         pblob, ctx, &xacl,
 166                         (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
 167
 168         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 169                 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
 170                         ndr_errstr(ndr_err)));
 171                 return ndr_map_error2ntstatus(ndr_err);
 172         }
 173
 174         return NT_STATUS_OK;
 175 }
 176
 177 /*******************************************************************
 178  Add in 3 inheritable components for a non-inheritable directory ACL.
 179  CREATOR_OWNER/CREATOR_GROUP/WORLD.
 180 *******************************************************************/
 181
 182 static void add_directory_inheritable_components(vfs_handle_struct *handle,
 183                                 const char *name,
 184                                 SMB_STRUCT_STAT *psbuf,
 185                                 struct security_descriptor *psd)
 186 {
 187         struct connection_struct *conn = handle->conn;
 188         int num_aces = (psd->dacl ? psd->dacl->num_aces : 0);
 189         struct smb_filename smb_fname;
 190         enum security_ace_type acltype;
 191         uint32_t access_mask;
 192         mode_t dir_mode;
 193         mode_t file_mode;
 194         mode_t mode;
 195         struct security_ace *new_ace_list = talloc_zero_array(talloc_tos(),
 196                                                 struct security_ace,
 197                                                 num_aces + 3);
 198
 199         if (new_ace_list == NULL) {
 200                 return;
 201         }
 202
 203         /* Fake a quick smb_filename. */
 204         ZERO_STRUCT(smb_fname);
 205         smb_fname.st = *psbuf;
 206         smb_fname.base_name = discard_const_p(char, name);
 207
 208         dir_mode = unix_mode(conn,
 209                         FILE_ATTRIBUTE_DIRECTORY, &smb_fname, NULL);
 210         file_mode = unix_mode(conn,
 211                         FILE_ATTRIBUTE_ARCHIVE, &smb_fname, NULL);
 212
 213         mode = dir_mode | file_mode;
 214
 215         DEBUG(10, ("add_directory_inheritable_components: directory %s, "
 216                 "mode = 0%o\n",
 217                 name,
 218                 (unsigned int)mode ));
 219
 220         if (num_aces) {
 221                 memcpy(new_ace_list, psd->dacl->aces,
 222                         num_aces * sizeof(struct security_ace));
 223         }
 224         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 225                                 mode & 0700, false);
 226
 227         init_sec_ace(&new_ace_list[num_aces],
 228                         &global_sid_Creator_Owner,
 229                         acltype,
 230                         access_mask,
 231                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 232                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 233                                 SEC_ACE_FLAG_INHERIT_ONLY);
 234         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 235                                 (mode << 3) & 0700, false);
 236         init_sec_ace(&new_ace_list[num_aces+1],
 237                         &global_sid_Creator_Group,
 238                         acltype,
 239                         access_mask,
 240                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 241                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 242                                 SEC_ACE_FLAG_INHERIT_ONLY);
 243         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 244                                 (mode << 6) & 0700, false);
 245         init_sec_ace(&new_ace_list[num_aces+2],
 246                         &global_sid_World,
 247                         acltype,
 248                         access_mask,
 249                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 250                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 251                                 SEC_ACE_FLAG_INHERIT_ONLY);
 252         psd->dacl->aces = new_ace_list;
 253         psd->dacl->num_aces += 3;
 254 }
 255
 256 /*******************************************************************
 257  Pull a DATA_BLOB from an xattr given a pathname.
 258  If the hash doesn't match, or doesn't exist - return the underlying
 259  filesystem sd.
 260 *******************************************************************/
 261
 262 static NTSTATUS get_nt_acl_internal(vfs_handle_struct *handle,
 263                                 files_struct *fsp,
 264                                 const char *name,
 265                                 uint32_t security_info,
 266                                 struct security_descriptor **ppdesc)
 267 {
 268         DATA_BLOB blob = data_blob_null;
 269         NTSTATUS status;
 270         uint16_t hash_type = XATTR_SD_HASH_TYPE_NONE;
 271         uint8_t hash[XATTR_SD_HASH_SIZE];
 272         uint8_t hash_tmp[XATTR_SD_HASH_SIZE];
 273         struct security_descriptor *psd = NULL;
 274         struct security_descriptor *pdesc_next = NULL;
 275         bool ignore_file_system_acl = lp_parm_bool(SNUM(handle->conn),
 276                                                 ACL_MODULE_NAME,
 277                                                 "ignore system acls",
 278                                                 false);
 279
 280         if (fsp && name == NULL) {
 281                 name = fsp->fsp_name->base_name;
 282         }
 283
 284         DEBUG(10, ("get_nt_acl_internal: name=%s\n", name));
 285
 286         /* Get the full underlying sd for the hash
 287            or to return as backup. */
 288         if (fsp) {
 289                 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 290                                 fsp,
 291                                 HASH_SECURITY_INFO,
 292                                 &pdesc_next);
 293         } else {
 294                 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 295                                 name,
 296                                 HASH_SECURITY_INFO,
 297                                 &pdesc_next);
 298         }
 299
 300         if (!NT_STATUS_IS_OK(status)) {
 301                 DEBUG(10, ("get_nt_acl_internal: get_next_acl for file %s "
 302                         "returned %s\n",
 303                         name,
 304                         nt_errstr(status)));
 305                 return status;
 306         }
 307
 308         status = get_acl_blob(talloc_tos(), handle, fsp, name, &blob);
 309         if (!NT_STATUS_IS_OK(status)) {
 310                 DEBUG(10, ("get_nt_acl_internal: get_acl_blob returned %s\n",
 311                         nt_errstr(status)));
 312                 psd = pdesc_next;
 313                 goto out;
 314         }
 315
 316         status = parse_acl_blob(&blob, &psd,
 317                                 &hash_type, &hash[0]);
 318         if (!NT_STATUS_IS_OK(status)) {
 319                 DEBUG(10, ("parse_acl_blob returned %s\n",
 320                                 nt_errstr(status)));
 321                 psd = pdesc_next;
 322                 goto out;
 323         }
 324
 325         /* Ensure the hash type is one we know. */
 326         switch (hash_type) {
 327                 case XATTR_SD_HASH_TYPE_NONE:
 328                         /* No hash, just return blob sd. */
 329                         goto out;
 330                 case XATTR_SD_HASH_TYPE_SHA256:
 331                         break;
 332                 default:
 333                         DEBUG(10, ("get_nt_acl_internal: ACL blob revision "
 334                                 "mismatch (%u) for file %s\n",
 335                                 (unsigned int)hash_type,
 336                                 name));
 337                         TALLOC_FREE(psd);
 338                         psd = pdesc_next;
 339                         goto out;
 340         }
 341
 342         if (ignore_file_system_acl) {
 343                 goto out;
 344         }
 345
 346         status = hash_sd_sha256(pdesc_next, hash_tmp);
 347         if (!NT_STATUS_IS_OK(status)) {
 348                 TALLOC_FREE(psd);
 349                 psd = pdesc_next;
 350                 goto out;
 351         }
 352
 353         if (memcmp(&hash[0], &hash_tmp[0], XATTR_SD_HASH_SIZE) == 0) {
 354                 /* Hash matches, return blob sd. */
 355                 DEBUG(10, ("get_nt_acl_internal: blob hash "
 356                         "matches for file %s\n",
 357                         name ));
 358                 goto out;
 359         }
 360
 361         /* Hash doesn't match, return underlying sd. */
 362         TALLOC_FREE(psd);
 363         psd = pdesc_next;
 364
 365   out:
 366
 367         if (psd != pdesc_next) {
 368                 /* We're returning the blob, throw
 369                  * away the filesystem SD. */
 370                 TALLOC_FREE(pdesc_next);
 371         } else {
 372                 SMB_STRUCT_STAT sbuf;
 373                 SMB_STRUCT_STAT *psbuf = &sbuf;
 374                 bool is_directory = false;
 375                 /*
 376                  * We're returning the underlying ACL from the
 377                  * filesystem. If it's a directory, and has no
 378                  * inheritable ACE entries we have to fake them.
 379                  */
 380                 if (fsp) {
 381                         status = vfs_stat_fsp(fsp);
 382                         if (!NT_STATUS_IS_OK(status)) {
 383                                 return status;
 384                         }
 385                         psbuf = &fsp->fsp_name->st;
 386                 } else {
 387                         int ret = vfs_stat_smb_fname(handle->conn,
 388                                                 name,
 389                                                 &sbuf);
 390                         if (ret == -1) {
 391                                 return map_nt_error_from_unix(errno);
 392                         }
 393                 }
 394                 is_directory = S_ISDIR(psbuf->st_ex_mode);
 395
 396                 if (ignore_file_system_acl) {
 397                         TALLOC_FREE(pdesc_next);
 398                         status = make_default_filesystem_acl(talloc_tos(),
 399                                                 name,
 400                                                 psbuf,
 401                                                 &psd);
 402                         if (!NT_STATUS_IS_OK(status)) {
 403                                 return status;
 404                         }
 405                 } else {
 406                         if (is_directory &&
 407                                 !sd_has_inheritable_components(psd,
 408                                                         true)) {
 409                                 add_directory_inheritable_components(handle,
 410                                                         name,
 411                                                         psbuf,
 412                                                         psd);
 413                         }
 414                         /* The underlying POSIX module always sets
 415                            the ~SEC_DESC_DACL_PROTECTED bit, as ACLs
 416                            can't be inherited in this way under POSIX.
 417                            Remove it for Windows-style ACLs. */
 418                         psd->type &= ~SEC_DESC_DACL_PROTECTED;
 419                 }
 420         }
 421
 422         if (!(security_info & SECINFO_OWNER)) {
 423                 psd->owner_sid = NULL;
 424         }
 425         if (!(security_info & SECINFO_GROUP)) {
 426                 psd->group_sid = NULL;
 427         }
 428         if (!(security_info & SECINFO_DACL)) {
 429                 psd->type &= ~SEC_DESC_DACL_PRESENT;
 430                 psd->dacl = NULL;
 431         }
 432         if (!(security_info & SECINFO_SACL)) {
 433                 psd->type &= ~SEC_DESC_SACL_PRESENT;
 434                 psd->sacl = NULL;
 435         }
 436
 437         TALLOC_FREE(blob.data);
 438         *ppdesc = psd;
 439
 440         if (DEBUGLEVEL >= 10) {
 441                 DEBUG(10,("get_nt_acl_internal: returning acl for %s is:\n",
 442                         name ));
 443                 NDR_PRINT_DEBUG(security_descriptor, psd);
 444         }
 445
 446         return NT_STATUS_OK;
 447 }
 448
 449 /*********************************************************************
 450  Fetch a security descriptor given an fsp.
 451 *********************************************************************/
 452
 453 static NTSTATUS fget_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
 454         uint32_t security_info, struct security_descriptor **ppdesc)
 455 {
 456         return get_nt_acl_internal(handle, fsp,
 457                                 NULL, security_info, ppdesc);
 458 }
 459
 460 /*********************************************************************
 461  Fetch a security descriptor given a pathname.
 462 *********************************************************************/
 463
 464 static NTSTATUS get_nt_acl_common(vfs_handle_struct *handle,
 465         const char *name, uint32_t security_info, struct security_descriptor **ppdesc)
 466 {
 467         return get_nt_acl_internal(handle, NULL,
 468                                 name, security_info, ppdesc);
 469 }
 470
 471 /*********************************************************************
 472  Store a security descriptor given an fsp.
 473 *********************************************************************/
 474
 475 static NTSTATUS fset_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
 476         uint32_t security_info_sent, const struct security_descriptor *orig_psd)
 477 {
 478         NTSTATUS status;
 479         DATA_BLOB blob;
 480         struct security_descriptor *pdesc_next = NULL;
 481         struct security_descriptor *psd = NULL;
 482         uint8_t hash[XATTR_SD_HASH_SIZE];
 483
 484         if (DEBUGLEVEL >= 10) {
 485                 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
 486                           fsp_str_dbg(fsp)));
 487                 NDR_PRINT_DEBUG(security_descriptor,
 488                         discard_const_p(struct security_descriptor, orig_psd));
 489         }
 490
 491         status = get_nt_acl_internal(handle, fsp,
 492                         NULL,
 493                         SECINFO_OWNER|SECINFO_GROUP|SECINFO_DACL|SECINFO_SACL,
 494                         &psd);
 495
 496         if (!NT_STATUS_IS_OK(status)) {
 497                 return status;
 498         }
 499
 500         psd->revision = orig_psd->revision;
 501         /* All our SD's are self relative. */
 502         psd->type = orig_psd->type | SEC_DESC_SELF_RELATIVE;
 503
 504         if ((security_info_sent & SECINFO_OWNER) && (orig_psd->owner_sid != NULL)) {
 505                 psd->owner_sid = orig_psd->owner_sid;
 506         }
 507         if ((security_info_sent & SECINFO_GROUP) && (orig_psd->group_sid != NULL)) {
 508                 psd->group_sid = orig_psd->group_sid;
 509         }
 510         if (security_info_sent & SECINFO_DACL) {
 511                 psd->dacl = orig_psd->dacl;
 512                 psd->type |= SEC_DESC_DACL_PRESENT;
 513         }
 514         if (security_info_sent & SECINFO_SACL) {
 515                 psd->sacl = orig_psd->sacl;
 516                 psd->type |= SEC_DESC_SACL_PRESENT;
 517         }
 518
 519         status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 520         if (!NT_STATUS_IS_OK(status)) {
 521                 return status;
 522         }
 523
 524         /* Get the full underlying sd, then hash. */
 525         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 526                                 fsp,
 527                                 HASH_SECURITY_INFO,
 528                                 &pdesc_next);
 529
 530         if (!NT_STATUS_IS_OK(status)) {
 531                 return status;
 532         }
 533
 534         status = hash_sd_sha256(pdesc_next, hash);
 535         if (!NT_STATUS_IS_OK(status)) {
 536                 return status;
 537         }
 538
 539         if (DEBUGLEVEL >= 10) {
 540                 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
 541                           fsp_str_dbg(fsp)));
 542                 NDR_PRINT_DEBUG(security_descriptor,
 543                         discard_const_p(struct security_descriptor, psd));
 544         }
 545         create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
 546         store_acl_blob_fsp(handle, fsp, &blob);
 547
 548         return NT_STATUS_OK;
 549 }
 550
 551 static int acl_common_remove_object(vfs_handle_struct *handle,
 552                                         const char *path,
 553                                         bool is_directory)
 554 {
 555         connection_struct *conn = handle->conn;
 556         struct file_id id;
 557         files_struct *fsp = NULL;
 558         int ret = 0;
 559         char *parent_dir = NULL;
 560         const char *final_component = NULL;
 561         struct smb_filename local_fname;
 562         int saved_errno = 0;
 563         char *saved_dir = NULL;
 564
 565         saved_dir = vfs_GetWd(talloc_tos(),conn);
 566         if (!saved_dir) {
 567                 saved_errno = errno;
 568                 goto out;
 569         }
 570
 571         if (!parent_dirname(talloc_tos(), path,
 572                         &parent_dir, &final_component)) {
 573                 saved_errno = ENOMEM;
 574                 goto out;
 575         }
 576
 577         DEBUG(10,("acl_common_remove_object: removing %s %s/%s\n",
 578                 is_directory ? "directory" : "file",
 579                 parent_dir, final_component ));
 580
 581         /* cd into the parent dir to pin it. */
 582         ret = vfs_ChDir(conn, parent_dir);
 583         if (ret == -1) {
 584                 saved_errno = errno;
 585                 goto out;
 586         }
 587
 588         ZERO_STRUCT(local_fname);
 589         local_fname.base_name = discard_const_p(char, final_component);
 590
 591         /* Must use lstat here. */
 592         ret = SMB_VFS_LSTAT(conn, &local_fname);
 593         if (ret == -1) {
 594                 saved_errno = errno;
 595                 goto out;
 596         }
 597
 598         /* Ensure we have this file open with DELETE access. */
 599         id = vfs_file_id_from_sbuf(conn, &local_fname.st);
 600         for (fsp = file_find_di_first(conn->sconn, id); fsp;
 601                      fsp = file_find_di_next(fsp)) {
 602                 if (fsp->access_mask & DELETE_ACCESS &&
 603                                 fsp->delete_on_close) {
 604                         /* We did open this for delete,
 605                          * allow the delete as root.
 606                          */
 607                         break;
 608                 }
 609         }
 610
 611         if (!fsp) {
 612                 DEBUG(10,("acl_common_remove_object: %s %s/%s "
 613                         "not an open file\n",
 614                         is_directory ? "directory" : "file",
 615                         parent_dir, final_component ));
 616                 saved_errno = EACCES;
 617                 goto out;
 618         }
 619
 620         become_root();
 621         if (is_directory) {
 622                 ret = SMB_VFS_NEXT_RMDIR(handle, final_component);
 623         } else {
 624                 ret = SMB_VFS_NEXT_UNLINK(handle, &local_fname);
 625         }
 626         unbecome_root();
 627
 628         if (ret == -1) {
 629                 saved_errno = errno;
 630         }
 631
 632   out:
 633
 634         TALLOC_FREE(parent_dir);
 635
 636         if (saved_dir) {
 637                 vfs_ChDir(conn, saved_dir);
 638         }
 639         if (saved_errno) {
 640                 errno = saved_errno;
 641         }
 642         return ret;
 643 }
 644
 645 static int rmdir_acl_common(struct vfs_handle_struct *handle,
 646                                 const char *path)
 647 {
 648         int ret;
 649
 650         /* Try the normal rmdir first. */
 651         ret = SMB_VFS_NEXT_RMDIR(handle, path);
 652         if (ret == 0) {
 653                 return 0;
 654         }
 655         if (errno == EACCES || errno == EPERM) {
 656                 /* Failed due to access denied,
 657                    see if we need to root override. */
 658                 return acl_common_remove_object(handle,
 659                                                 path,
 660                                                 true);
 661         }
 662
 663         DEBUG(10,("rmdir_acl_common: unlink of %s failed %s\n",
 664                 path,
 665                 strerror(errno) ));
 666         return -1;
 667 }
 668
 669 static int unlink_acl_common(struct vfs_handle_struct *handle,
 670                         const struct smb_filename *smb_fname)
 671 {
 672         int ret;
 673
 674         /* Try the normal unlink first. */
 675         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 676         if (ret == 0) {
 677                 return 0;
 678         }
 679         if (errno == EACCES || errno == EPERM) {
 680                 /* Failed due to access denied,
 681                    see if we need to root override. */
 682
 683                 /* Don't do anything fancy for streams. */
 684                 if (smb_fname->stream_name) {
 685                         return -1;
 686                 }
 687                 return acl_common_remove_object(handle,
 688                                         smb_fname->base_name,
 689                                         false);
 690         }
 691
 692         DEBUG(10,("unlink_acl_common: unlink of %s failed %s\n",
 693                 smb_fname->base_name,
 694                 strerror(errno) ));
 695         return -1;
 696 }
 697
 698 static int chmod_acl_module_common(struct vfs_handle_struct *handle,
 699                         const char *path, mode_t mode)
 700 {
 701         if (lp_posix_pathnames()) {
 702                 /* Only allow this on POSIX pathnames. */
 703                 return SMB_VFS_NEXT_CHMOD(handle, path, mode);
 704         }
 705         return 0;
 706 }
 707
 708 static int fchmod_acl_module_common(struct vfs_handle_struct *handle,
 709                         struct files_struct *fsp, mode_t mode)
 710 {
 711         if (fsp->posix_open) {
 712                 /* Only allow this on POSIX opens. */
 713                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
 714         }
 715         return 0;
 716 }
 717
 718 static int chmod_acl_acl_module_common(struct vfs_handle_struct *handle,
 719                         const char *name, mode_t mode)
 720 {
 721         if (lp_posix_pathnames()) {
 722                 /* Only allow this on POSIX pathnames. */
 723                 return SMB_VFS_NEXT_CHMOD_ACL(handle, name, mode);
 724         }
 725         return 0;
 726 }
 727
 728 static int fchmod_acl_acl_module_common(struct vfs_handle_struct *handle,
 729                         struct files_struct *fsp, mode_t mode)
 730 {
 731         if (fsp->posix_open) {
 732                 /* Only allow this on POSIX opens. */
 733                 return SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);
 734         }
 735         return 0;
 736 }