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  * Copyright (C) Ralph Böhme, 2016
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #include "includes.h"
  24 #include "vfs_acl_common.h"
  25 #include "smbd/smbd.h"
  26 #include "system/filesys.h"
  27 #include "librpc/gen_ndr/ndr_xattr.h"
  28 #include "../libcli/security/security.h"
  29 #include "../librpc/gen_ndr/ndr_security.h"
  30 #include "../lib/util/bitmap.h"
  31 #include "passdb/lookup_sid.h"
  32
  33 #include <gnutls/gnutls.h>
  34 #include <gnutls/crypto.h>
  35
  36 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
  37                         DATA_BLOB *pblob,
  38                         uint16_t hash_type,
  39                         uint8_t hash[XATTR_SD_HASH_SIZE]);
  40
  41 #define HASH_SECURITY_INFO (SECINFO_OWNER | \
  42                                 SECINFO_GROUP | \
  43                                 SECINFO_DACL | \
  44                                 SECINFO_SACL)
  45
  46 bool init_acl_common_config(vfs_handle_struct *handle,
  47                             const char *module_name)
  48 {
  49         struct acl_common_config *config = NULL;
  50         const struct enum_list *default_acl_style_list = NULL;
  51
  52         default_acl_style_list = get_default_acl_style_list();
  53
  54         config = talloc_zero(handle->conn, struct acl_common_config);
  55         if (config == NULL) {
  56                 DBG_ERR("talloc_zero() failed\n");
  57                 errno = ENOMEM;
  58                 return false;
  59         }
  60
  61         config->ignore_system_acls = lp_parm_bool(SNUM(handle->conn),
  62                                                   module_name,
  63                                                   "ignore system acls",
  64                                                   false);
  65         config->default_acl_style = lp_parm_enum(SNUM(handle->conn),
  66                                                  module_name,
  67                                                  "default acl style",
  68                                                  default_acl_style_list,
  69                                                  DEFAULT_ACL_POSIX);
  70
  71         SMB_VFS_HANDLE_SET_DATA(handle, config, NULL,
  72                                 struct acl_common_config,
  73                                 return false);
  74
  75         return true;
  76 }
  77
  78
  79 /*******************************************************************
  80  Hash a security descriptor.
  81 *******************************************************************/
  82
  83 static NTSTATUS hash_blob_sha256(DATA_BLOB blob,
  84                                  uint8_t *hash)
  85 {
  86         int rc;
  87
  88         ZERO_ARRAY_LEN(hash, XATTR_SD_HASH_SIZE);
  89
  90         rc = gnutls_hash_fast(GNUTLS_DIG_SHA256,
  91                               blob.data,
  92                               blob.length,
  93                               hash);
  94         if (rc < 0) {
  95                 return NT_STATUS_INTERNAL_ERROR;
  96         }
  97
  98         return NT_STATUS_OK;
  99 }
 100
 101 /*******************************************************************
 102  Hash a security descriptor.
 103 *******************************************************************/
 104
 105 static NTSTATUS hash_sd_sha256(struct security_descriptor *psd,
 106                         uint8_t *hash)
 107 {
 108         DATA_BLOB blob;
 109         NTSTATUS status;
 110
 111         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 112         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
 113         if (!NT_STATUS_IS_OK(status)) {
 114                 return status;
 115         }
 116         return hash_blob_sha256(blob, hash);
 117 }
 118
 119 /*******************************************************************
 120  Parse out a struct security_descriptor from a DATA_BLOB.
 121 *******************************************************************/
 122
 123 static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
 124                                TALLOC_CTX *mem_ctx,
 125                                struct security_descriptor **ppdesc,
 126                                uint16_t *p_hash_type,
 127                                uint16_t *p_version,
 128                                uint8_t hash[XATTR_SD_HASH_SIZE],
 129                                uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE])
 130 {
 131         struct xattr_NTACL xacl;
 132         enum ndr_err_code ndr_err;
 133         size_t sd_size;
 134         TALLOC_CTX *frame = talloc_stackframe();
 135
 136         ndr_err = ndr_pull_struct_blob(pblob, frame, &xacl,
 137                         (ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
 138
 139         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 140                 DBG_INFO("ndr_pull_xattr_NTACL failed: %s\n",
 141                          ndr_errstr(ndr_err));
 142                 TALLOC_FREE(frame);
 143                 return ndr_map_error2ntstatus(ndr_err);
 144         }
 145
 146         *p_version = xacl.version;
 147
 148         switch (xacl.version) {
 149                 case 1:
 150                         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 151                                         xacl.info.sd->type | SEC_DESC_SELF_RELATIVE,
 152                                         xacl.info.sd->owner_sid,
 153                                         xacl.info.sd->group_sid,
 154                                         xacl.info.sd->sacl,
 155                                         xacl.info.sd->dacl,
 156                                         &sd_size);
 157                         /* No hash - null out. */
 158                         *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
 159                         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 160                         break;
 161                 case 2:
 162                         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 163                                         xacl.info.sd_hs2->sd->type | SEC_DESC_SELF_RELATIVE,
 164                                         xacl.info.sd_hs2->sd->owner_sid,
 165                                         xacl.info.sd_hs2->sd->group_sid,
 166                                         xacl.info.sd_hs2->sd->sacl,
 167                                         xacl.info.sd_hs2->sd->dacl,
 168                                         &sd_size);
 169                         /* No hash - null out. */
 170                         *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
 171                         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 172                         break;
 173                 case 3:
 174                         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 175                                         xacl.info.sd_hs3->sd->type | SEC_DESC_SELF_RELATIVE,
 176                                         xacl.info.sd_hs3->sd->owner_sid,
 177                                         xacl.info.sd_hs3->sd->group_sid,
 178                                         xacl.info.sd_hs3->sd->sacl,
 179                                         xacl.info.sd_hs3->sd->dacl,
 180                                         &sd_size);
 181                         *p_hash_type = xacl.info.sd_hs3->hash_type;
 182                         /* Current version 3 (if no sys acl hash available). */
 183                         memcpy(hash, xacl.info.sd_hs3->hash, XATTR_SD_HASH_SIZE);
 184                         break;
 185                 case 4:
 186                         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 187                                         xacl.info.sd_hs4->sd->type | SEC_DESC_SELF_RELATIVE,
 188                                         xacl.info.sd_hs4->sd->owner_sid,
 189                                         xacl.info.sd_hs4->sd->group_sid,
 190                                         xacl.info.sd_hs4->sd->sacl,
 191                                         xacl.info.sd_hs4->sd->dacl,
 192                                         &sd_size);
 193                         *p_hash_type = xacl.info.sd_hs4->hash_type;
 194                         /* Current version 4. */
 195                         memcpy(hash, xacl.info.sd_hs4->hash, XATTR_SD_HASH_SIZE);
 196                         memcpy(sys_acl_hash, xacl.info.sd_hs4->sys_acl_hash, XATTR_SD_HASH_SIZE);
 197                         break;
 198                 default:
 199                         TALLOC_FREE(frame);
 200                         return NT_STATUS_REVISION_MISMATCH;
 201         }
 202
 203         TALLOC_FREE(frame);
 204
 205         return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
 206 }
 207
 208 /*******************************************************************
 209  Create a DATA_BLOB from a hash of the security descriptor storead at
 210  the system layer and the NT ACL we wish to preserve
 211 *******************************************************************/
 212
 213 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
 214                         DATA_BLOB *pblob,
 215                         uint16_t hash_type,
 216                         uint8_t hash[XATTR_SD_HASH_SIZE])
 217 {
 218         struct xattr_NTACL xacl;
 219         struct security_descriptor_hash_v3 sd_hs3;
 220         enum ndr_err_code ndr_err;
 221         TALLOC_CTX *ctx = talloc_tos();
 222
 223         ZERO_STRUCT(xacl);
 224         ZERO_STRUCT(sd_hs3);
 225
 226         xacl.version = 3;
 227         xacl.info.sd_hs3 = &sd_hs3;
 228         xacl.info.sd_hs3->sd = discard_const_p(struct security_descriptor, psd);
 229         xacl.info.sd_hs3->hash_type = hash_type;
 230         memcpy(&xacl.info.sd_hs3->hash[0], hash, XATTR_SD_HASH_SIZE);
 231
 232         ndr_err = ndr_push_struct_blob(
 233                         pblob, ctx, &xacl,
 234                         (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
 235
 236         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 237                 DBG_INFO("ndr_push_xattr_NTACL failed: %s\n",
 238                          ndr_errstr(ndr_err));
 239                 return ndr_map_error2ntstatus(ndr_err);
 240         }
 241
 242         return NT_STATUS_OK;
 243 }
 244
 245 /*******************************************************************
 246  Create a DATA_BLOB from a hash of the security descriptors
 247  (system and NT) stored at the system layer and the NT ACL we wish
 248  to preserve.
 249 *******************************************************************/
 250
 251 static NTSTATUS create_sys_acl_blob(const struct security_descriptor *psd,
 252                                     DATA_BLOB *pblob,
 253                                     uint16_t hash_type,
 254                                     uint8_t hash[XATTR_SD_HASH_SIZE],
 255                                     const char *description,
 256                                     uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE])
 257 {
 258         struct xattr_NTACL xacl;
 259         struct security_descriptor_hash_v4 sd_hs4;
 260         enum ndr_err_code ndr_err;
 261         TALLOC_CTX *ctx = talloc_tos();
 262         NTTIME nttime_now;
 263         struct timeval now = timeval_current();
 264         nttime_now = timeval_to_nttime(&now);
 265
 266         ZERO_STRUCT(xacl);
 267         ZERO_STRUCT(sd_hs4);
 268
 269         xacl.version = 4;
 270         xacl.info.sd_hs4 = &sd_hs4;
 271         xacl.info.sd_hs4->sd = discard_const_p(struct security_descriptor, psd);
 272         xacl.info.sd_hs4->hash_type = hash_type;
 273         memcpy(&xacl.info.sd_hs4->hash[0], hash, XATTR_SD_HASH_SIZE);
 274         xacl.info.sd_hs4->description = description;
 275         xacl.info.sd_hs4->time = nttime_now;
 276         memcpy(&xacl.info.sd_hs4->sys_acl_hash[0], sys_acl_hash, XATTR_SD_HASH_SIZE);
 277
 278         ndr_err = ndr_push_struct_blob(
 279                         pblob, ctx, &xacl,
 280                         (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
 281
 282         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 283                 DBG_INFO("ndr_push_xattr_NTACL failed: %s\n",
 284                          ndr_errstr(ndr_err));
 285                 return ndr_map_error2ntstatus(ndr_err);
 286         }
 287
 288         return NT_STATUS_OK;
 289 }
 290
 291 /*******************************************************************
 292  Add in 3 inheritable components for a non-inheritable directory ACL.
 293  CREATOR_OWNER/CREATOR_GROUP/WORLD.
 294 *******************************************************************/
 295
 296 static NTSTATUS add_directory_inheritable_components(vfs_handle_struct *handle,
 297                                 const char *name,
 298                                 SMB_STRUCT_STAT *psbuf,
 299                                 struct security_descriptor *psd)
 300 {
 301         struct connection_struct *conn = handle->conn;
 302         int num_aces = (psd->dacl ? psd->dacl->num_aces : 0);
 303         struct smb_filename smb_fname;
 304         enum security_ace_type acltype;
 305         uint32_t access_mask;
 306         mode_t dir_mode;
 307         mode_t file_mode;
 308         mode_t mode;
 309         struct security_ace *new_ace_list;
 310
 311         if (psd->dacl) {
 312                 new_ace_list = talloc_zero_array(psd->dacl,
 313                                                  struct security_ace,
 314                                                  num_aces + 3);
 315         } else {
 316                 /*
 317                  * make_sec_acl() at the bottom of this function
 318                  * dupliates new_ace_list
 319                  */
 320                 new_ace_list = talloc_zero_array(talloc_tos(),
 321                                                  struct security_ace,
 322                                                  num_aces + 3);
 323         }
 324
 325         if (new_ace_list == NULL) {
 326                 return NT_STATUS_NO_MEMORY;
 327         }
 328
 329         /* Fake a quick smb_filename. */
 330         ZERO_STRUCT(smb_fname);
 331         smb_fname.st = *psbuf;
 332         smb_fname.base_name = discard_const_p(char, name);
 333
 334         dir_mode = unix_mode(conn,
 335                         FILE_ATTRIBUTE_DIRECTORY, &smb_fname, NULL);
 336         file_mode = unix_mode(conn,
 337                         FILE_ATTRIBUTE_ARCHIVE, &smb_fname, NULL);
 338
 339         mode = dir_mode | file_mode;
 340
 341         DBG_DEBUG("directory %s, mode = 0%o\n", name, (unsigned int)mode);
 342
 343         if (num_aces) {
 344                 memcpy(new_ace_list, psd->dacl->aces,
 345                         num_aces * sizeof(struct security_ace));
 346         }
 347         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 348                                 mode & 0700, false);
 349
 350         init_sec_ace(&new_ace_list[num_aces],
 351                         &global_sid_Creator_Owner,
 352                         acltype,
 353                         access_mask,
 354                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 355                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 356                                 SEC_ACE_FLAG_INHERIT_ONLY);
 357         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 358                                 (mode << 3) & 0700, false);
 359         init_sec_ace(&new_ace_list[num_aces+1],
 360                         &global_sid_Creator_Group,
 361                         acltype,
 362                         access_mask,
 363                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 364                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 365                                 SEC_ACE_FLAG_INHERIT_ONLY);
 366         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 367                                 (mode << 6) & 0700, false);
 368         init_sec_ace(&new_ace_list[num_aces+2],
 369                         &global_sid_World,
 370                         acltype,
 371                         access_mask,
 372                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 373                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 374                                 SEC_ACE_FLAG_INHERIT_ONLY);
 375         if (psd->dacl) {
 376                 psd->dacl->aces = new_ace_list;
 377                 psd->dacl->num_aces += 3;
 378                 psd->dacl->size += new_ace_list[num_aces].size +
 379                         new_ace_list[num_aces+1].size +
 380                         new_ace_list[num_aces+2].size;
 381         } else {
 382                 psd->dacl = make_sec_acl(psd,
 383                                 NT4_ACL_REVISION,
 384                                 3,
 385                                 new_ace_list);
 386                 if (psd->dacl == NULL) {
 387                         return NT_STATUS_NO_MEMORY;
 388                 }
 389         }
 390         return NT_STATUS_OK;
 391 }
 392
 393 /**
 394  * Validate an ACL blob
 395  *
 396  * This validates an ACL blob against the underlying filesystem ACL. If this
 397  * function returns NT_STATUS_OK ppsd can be
 398  *
 399  * 1. the ACL from the blob (psd_from_fs=false), or
 400  * 2. the ACL from the fs (psd_from_fs=true), or
 401  * 3. NULL (!)
 402  *
 403  * If the return value is anything else then NT_STATUS_OK, ppsd is set to NULL
 404  * and psd_from_fs set to false.
 405  *
 406  * Returning the underlying filesystem ACL in case no. 2 is really just an
 407  * optimisation, because some validations have to fetch the filesytem ACL as
 408  * part of the validation, so we already have it available and callers might
 409  * need it as well.
 410  **/
 411 static NTSTATUS validate_nt_acl_blob(TALLOC_CTX *mem_ctx,
 412                                 vfs_handle_struct *handle,
 413                                 struct files_struct *fsp,
 414                                 struct files_struct *dirfsp,
 415                                 const struct smb_filename *smb_fname,
 416                                 const DATA_BLOB *blob,
 417                                 struct security_descriptor **ppsd,
 418                                 bool *psd_is_from_fs)
 419 {
 420         NTSTATUS status;
 421         uint16_t hash_type = XATTR_SD_HASH_TYPE_NONE;
 422         uint16_t xattr_version = 0;
 423         uint8_t hash[XATTR_SD_HASH_SIZE];
 424         uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE];
 425         uint8_t hash_tmp[XATTR_SD_HASH_SIZE];
 426         uint8_t sys_acl_hash_tmp[XATTR_SD_HASH_SIZE];
 427         struct security_descriptor *psd = NULL;
 428         struct security_descriptor *psd_blob = NULL;
 429         struct security_descriptor *psd_fs = NULL;
 430         char *sys_acl_blob_description = NULL;
 431         DATA_BLOB sys_acl_blob = { 0 };
 432         struct acl_common_config *config = NULL;
 433
 434         *ppsd = NULL;
 435         *psd_is_from_fs = false;
 436
 437         SMB_VFS_HANDLE_GET_DATA(handle, config,
 438                                 struct acl_common_config,
 439                                 return NT_STATUS_UNSUCCESSFUL);
 440
 441         status = parse_acl_blob(blob,
 442                                 mem_ctx,
 443                                 &psd_blob,
 444                                 &hash_type,
 445                                 &xattr_version,
 446                                 &hash[0],
 447                                 &sys_acl_hash[0]);
 448         if (!NT_STATUS_IS_OK(status)) {
 449                 DBG_DEBUG("parse_acl_blob returned %s\n", nt_errstr(status));
 450                 goto fail;
 451         }
 452
 453         /* determine which type of xattr we got */
 454         switch (xattr_version) {
 455         case 1:
 456         case 2:
 457                 /* These xattr types are unilatteral, they do not
 458                  * require confirmation of the hash.  In particular,
 459                  * the NTVFS file server uses version 1, but
 460                  * 'samba-tool ntacl' can set these as well */
 461                 *ppsd = psd_blob;
 462                 return NT_STATUS_OK;
 463         case 3:
 464         case 4:
 465                 if (config->ignore_system_acls) {
 466                         *ppsd = psd_blob;
 467                         return NT_STATUS_OK;
 468                 }
 469
 470                 break;
 471         default:
 472                 DBG_DEBUG("ACL blob revision mismatch (%u) for file %s\n",
 473                           (unsigned int)hash_type, smb_fname->base_name);
 474                 TALLOC_FREE(psd_blob);
 475                 return NT_STATUS_OK;
 476         }
 477
 478         /* determine which type of xattr we got */
 479         if (hash_type != XATTR_SD_HASH_TYPE_SHA256) {
 480                 DBG_DEBUG("ACL blob hash type (%u) unexpected for file %s\n",
 481                           (unsigned int)hash_type, smb_fname->base_name);
 482                 TALLOC_FREE(psd_blob);
 483                 return NT_STATUS_OK;
 484         }
 485
 486         /* determine which type of xattr we got */
 487         switch (xattr_version) {
 488         case 4:
 489         {
 490                 int ret;
 491                 if (fsp) {
 492                         /* Get the full underlying sd, then hash. */
 493                         ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle,
 494                                                                fsp,
 495                                                                mem_ctx,
 496                                                                &sys_acl_blob_description,
 497                                                                &sys_acl_blob);
 498                 } else {
 499                         /* Get the full underlying sd, then hash. */
 500                         ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FILE(handle,
 501                                                  smb_fname,
 502                                                  mem_ctx,
 503                                                  &sys_acl_blob_description,
 504                                                  &sys_acl_blob);
 505                 }
 506
 507                 /* If we fail to get the ACL blob (for some reason) then this
 508                  * is not fatal, we just work based on the NT ACL only */
 509                 if (ret == 0) {
 510                         status = hash_blob_sha256(sys_acl_blob, sys_acl_hash_tmp);
 511                         if (!NT_STATUS_IS_OK(status)) {
 512                                 goto fail;
 513                         }
 514
 515                         TALLOC_FREE(sys_acl_blob_description);
 516                         TALLOC_FREE(sys_acl_blob.data);
 517
 518                         if (memcmp(&sys_acl_hash[0], &sys_acl_hash_tmp[0],
 519                                    XATTR_SD_HASH_SIZE) == 0) {
 520                                 /* Hash matches, return blob sd. */
 521                                 DBG_DEBUG("blob hash matches for file %s\n",
 522                                           smb_fname->base_name);
 523                                 *ppsd = psd_blob;
 524                                 return NT_STATUS_OK;
 525                         }
 526                 }
 527
 528                 /* Otherwise, fall though and see if the NT ACL hash matches */
 529                 FALL_THROUGH;
 530         }
 531         case 3:
 532                 /* Get the full underlying sd for the hash
 533                    or to return as backup. */
 534                 if (fsp) {
 535                         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 536                                                           fsp,
 537                                                           HASH_SECURITY_INFO,
 538                                                           mem_ctx,
 539                                                           &psd_fs);
 540                 } else {
 541                         status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 542                                                          smb_fname,
 543                                                          HASH_SECURITY_INFO,
 544                                                          mem_ctx,
 545                                                          &psd_fs);
 546                 }
 547
 548                 if (!NT_STATUS_IS_OK(status)) {
 549                         DBG_DEBUG("get_next_acl for file %s returned %s\n",
 550                                   smb_fname->base_name, nt_errstr(status));
 551                         goto fail;
 552                 }
 553
 554                 status = hash_sd_sha256(psd_fs, hash_tmp);
 555                 if (!NT_STATUS_IS_OK(status)) {
 556                         TALLOC_FREE(psd_blob);
 557                         *ppsd = psd_fs;
 558                         *psd_is_from_fs = true;
 559                         return NT_STATUS_OK;
 560                 }
 561
 562                 if (memcmp(&hash[0], &hash_tmp[0], XATTR_SD_HASH_SIZE) == 0) {
 563                         /* Hash matches, return blob sd. */
 564                         DBG_DEBUG("blob hash matches for file %s\n",
 565                                   smb_fname->base_name);
 566                         *ppsd = psd_blob;
 567                         return NT_STATUS_OK;
 568                 }
 569
 570                 /* Hash doesn't match, return underlying sd. */
 571                 DBG_DEBUG("blob hash does not match for file %s - returning "
 572                           "file system SD mapping.\n",
 573                           smb_fname->base_name);
 574
 575                 if (DEBUGLEVEL >= 10) {
 576                         DBG_DEBUG("acl for blob hash for %s is:\n",
 577                                   smb_fname->base_name);
 578                         NDR_PRINT_DEBUG(security_descriptor, psd_fs);
 579                 }
 580
 581                 TALLOC_FREE(psd_blob);
 582                 *ppsd = psd_fs;
 583                 *psd_is_from_fs = true;
 584         }
 585
 586         return NT_STATUS_OK;
 587
 588 fail:
 589         TALLOC_FREE(psd);
 590         TALLOC_FREE(psd_blob);
 591         TALLOC_FREE(psd_fs);
 592         TALLOC_FREE(sys_acl_blob_description);
 593         TALLOC_FREE(sys_acl_blob.data);
 594         return status;
 595 }
 596
 597 /*******************************************************************
 598  Pull a DATA_BLOB from an xattr given an fsp.
 599  If the hash doesn't match, or doesn't exist - return the underlying
 600  filesystem sd.
 601 *******************************************************************/
 602
 603 NTSTATUS fget_nt_acl_common(
 604         NTSTATUS (*fget_acl_blob_fn)(TALLOC_CTX *ctx,
 605                                     vfs_handle_struct *handle,
 606                                     files_struct *fsp,
 607                                     DATA_BLOB *pblob),
 608         vfs_handle_struct *handle,
 609         files_struct *fsp,
 610         uint32_t security_info,
 611         TALLOC_CTX *mem_ctx,
 612         struct security_descriptor **ppdesc)
 613 {
 614         DATA_BLOB blob = data_blob_null;
 615         NTSTATUS status;
 616         struct security_descriptor *psd = NULL;
 617         const struct smb_filename *smb_fname = fsp->fsp_name;
 618         bool psd_is_from_fs = false;
 619         struct acl_common_config *config = NULL;
 620
 621         SMB_VFS_HANDLE_GET_DATA(handle, config,
 622                                 struct acl_common_config,
 623                                 return NT_STATUS_UNSUCCESSFUL);
 624
 625         DBG_DEBUG("name=%s\n", smb_fname->base_name);
 626
 627         status = fget_acl_blob_fn(mem_ctx, handle, fsp, &blob);
 628         if (NT_STATUS_IS_OK(status)) {
 629                 status = validate_nt_acl_blob(mem_ctx,
 630                                         handle,
 631                                         fsp,
 632                                         NULL,
 633                                         smb_fname,
 634                                         &blob,
 635                                         &psd,
 636                                         &psd_is_from_fs);
 637                 TALLOC_FREE(blob.data);
 638                 if (!NT_STATUS_IS_OK(status)) {
 639                         DBG_DEBUG("ACL validation for [%s] failed\n",
 640                                   smb_fname->base_name);
 641                         goto fail;
 642                 }
 643         }
 644
 645         if (psd == NULL) {
 646                 /* Get the full underlying sd, as we failed to get the
 647                  * blob for the hash, or the revision/hash type wasn't
 648                  * known */
 649
 650                 if (config->ignore_system_acls) {
 651                         status = vfs_stat_fsp(fsp);
 652                         if (!NT_STATUS_IS_OK(status)) {
 653                                 goto fail;
 654                         }
 655
 656                         status = make_default_filesystem_acl(
 657                                 mem_ctx,
 658                                 config->default_acl_style,
 659                                 smb_fname->base_name,
 660                                 &fsp->fsp_name->st,
 661                                 &psd);
 662                         if (!NT_STATUS_IS_OK(status)) {
 663                                 goto fail;
 664                         }
 665                 } else {
 666                         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 667                                                           fsp,
 668                                                           security_info,
 669                                                           mem_ctx,
 670                                                           &psd);
 671
 672                         if (!NT_STATUS_IS_OK(status)) {
 673                                 DBG_DEBUG("get_next_acl for file %s "
 674                                           "returned %s\n",
 675                                           smb_fname->base_name,
 676                                           nt_errstr(status));
 677                                 goto fail;
 678                         }
 679
 680                         psd_is_from_fs = true;
 681                 }
 682         }
 683
 684         if (psd_is_from_fs) {
 685                 status = vfs_stat_fsp(fsp);
 686                 if (!NT_STATUS_IS_OK(status)) {
 687                         goto fail;
 688                 }
 689
 690                 /*
 691                  * We're returning the underlying ACL from the
 692                  * filesystem. If it's a directory, and has no
 693                  * inheritable ACE entries we have to fake them.
 694                  */
 695
 696                 if (fsp->fsp_flags.is_directory &&
 697                                 !sd_has_inheritable_components(psd, true)) {
 698                         status = add_directory_inheritable_components(
 699                                 handle,
 700                                 smb_fname->base_name,
 701                                 &fsp->fsp_name->st,
 702                                 psd);
 703                         if (!NT_STATUS_IS_OK(status)) {
 704                                 goto fail;
 705                         }
 706                 }
 707
 708                 /*
 709                  * The underlying POSIX module always sets the
 710                  * ~SEC_DESC_DACL_PROTECTED bit, as ACLs can't be inherited in
 711                  * this way under POSIX. Remove it for Windows-style ACLs.
 712                  */
 713                 psd->type &= ~SEC_DESC_DACL_PROTECTED;
 714         }
 715
 716         if (!(security_info & SECINFO_OWNER)) {
 717                 psd->owner_sid = NULL;
 718         }
 719         if (!(security_info & SECINFO_GROUP)) {
 720                 psd->group_sid = NULL;
 721         }
 722         if (!(security_info & SECINFO_DACL)) {
 723                 psd->type &= ~SEC_DESC_DACL_PRESENT;
 724                 psd->dacl = NULL;
 725         }
 726         if (!(security_info & SECINFO_SACL)) {
 727                 psd->type &= ~SEC_DESC_SACL_PRESENT;
 728                 psd->sacl = NULL;
 729         }
 730
 731         if (DEBUGLEVEL >= 10) {
 732                 DBG_DEBUG("returning acl for %s is:\n",
 733                           smb_fname->base_name);
 734                 NDR_PRINT_DEBUG(security_descriptor, psd);
 735         }
 736
 737         *ppdesc = psd;
 738
 739         return NT_STATUS_OK;
 740
 741 fail:
 742         TALLOC_FREE(psd);
 743         return status;
 744 }
 745
 746 /*******************************************************************
 747  Pull a DATA_BLOB from an xattr given a pathname.
 748  If the hash doesn't match, or doesn't exist - return the underlying
 749  filesystem sd.
 750 *******************************************************************/
 751
 752 NTSTATUS get_nt_acl_common_at(
 753         NTSTATUS (*get_acl_blob_at_fn)(TALLOC_CTX *ctx,
 754                                     vfs_handle_struct *handle,
 755                                     struct files_struct *dirfsp,
 756                                     const struct smb_filename *smb_fname,
 757                                     DATA_BLOB *pblob),
 758         vfs_handle_struct *handle,
 759         struct files_struct *dirfsp,
 760         const struct smb_filename *smb_fname_in,
 761         uint32_t security_info,
 762         TALLOC_CTX *mem_ctx,
 763         struct security_descriptor **ppdesc)
 764 {
 765         DATA_BLOB blob = data_blob_null;
 766         NTSTATUS status;
 767         struct security_descriptor *psd = NULL;
 768         bool psd_is_from_fs = false;
 769         struct acl_common_config *config = NULL;
 770
 771         SMB_VFS_HANDLE_GET_DATA(handle, config,
 772                                 struct acl_common_config,
 773                                 return NT_STATUS_UNSUCCESSFUL);
 774
 775         DBG_DEBUG("name=%s\n", smb_fname_in->base_name);
 776
 777         status = get_acl_blob_at_fn(mem_ctx,
 778                                 handle,
 779                                 dirfsp,
 780                                 smb_fname_in,
 781                                 &blob);
 782         if (NT_STATUS_IS_OK(status)) {
 783                 status = validate_nt_acl_blob(mem_ctx,
 784                                         handle,
 785                                         NULL,
 786                                         dirfsp,
 787                                         smb_fname_in,
 788                                         &blob,
 789                                         &psd,
 790                                         &psd_is_from_fs);
 791                 TALLOC_FREE(blob.data);
 792                 if (!NT_STATUS_IS_OK(status)) {
 793                         DBG_DEBUG("ACL validation for [%s] failed\n",
 794                                   smb_fname_in->base_name);
 795                         goto fail;
 796                 }
 797         }
 798
 799         if (psd == NULL) {
 800                 /* Get the full underlying sd, as we failed to get the
 801                  * blob for the hash, or the revision/hash type wasn't
 802                  * known */
 803
 804                 if (config->ignore_system_acls) {
 805                         SMB_STRUCT_STAT sbuf;
 806                         int ret;
 807
 808                         ret = vfs_stat_smb_basename(handle->conn,
 809                                         smb_fname_in,
 810                                         &sbuf);
 811                         if (ret == -1) {
 812                                 status = map_nt_error_from_unix(errno);
 813                                 goto fail;
 814                         }
 815
 816                         status = make_default_filesystem_acl(
 817                                 mem_ctx,
 818                                 config->default_acl_style,
 819                                 smb_fname_in->base_name,
 820                                 &sbuf,
 821                                 &psd);
 822                         if (!NT_STATUS_IS_OK(status)) {
 823                                 goto fail;
 824                         }
 825                 } else {
 826                         status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 827                                                          smb_fname_in,
 828                                                          security_info,
 829                                                          mem_ctx,
 830                                                          &psd);
 831
 832                         if (!NT_STATUS_IS_OK(status)) {
 833                                 DBG_DEBUG("get_next_acl for file %s "
 834                                           "returned %s\n",
 835                                           smb_fname_in->base_name,
 836                                           nt_errstr(status));
 837                                 goto fail;
 838                         }
 839
 840                         psd_is_from_fs = true;
 841                 }
 842         }
 843
 844         if (psd_is_from_fs) {
 845                 SMB_STRUCT_STAT sbuf;
 846                 bool is_directory = false;
 847                 int ret;
 848
 849                 /*
 850                  * We're returning the underlying ACL from the
 851                  * filesystem. If it's a directory, and has no
 852                  * inheritable ACE entries we have to fake them.
 853                  */
 854
 855                 ret = vfs_stat_smb_basename(handle->conn,
 856                                 smb_fname_in,
 857                                 &sbuf);
 858                 if (ret == -1) {
 859                         status = map_nt_error_from_unix(errno);
 860                         goto fail;
 861                 }
 862
 863                 is_directory = S_ISDIR(sbuf.st_ex_mode);
 864
 865                 if (is_directory && !sd_has_inheritable_components(psd, true)) {
 866                         status = add_directory_inheritable_components(
 867                                 handle,
 868                                 smb_fname_in->base_name,
 869                                 &sbuf,
 870                                 psd);
 871                         if (!NT_STATUS_IS_OK(status)) {
 872                                 goto fail;
 873                         }
 874                 }
 875
 876                 /*
 877                  * The underlying POSIX module always sets the
 878                  * ~SEC_DESC_DACL_PROTECTED bit, as ACLs can't be inherited in
 879                  * this way under POSIX. Remove it for Windows-style ACLs.
 880                  */
 881                 psd->type &= ~SEC_DESC_DACL_PROTECTED;
 882         }
 883
 884         if (!(security_info & SECINFO_OWNER)) {
 885                 psd->owner_sid = NULL;
 886         }
 887         if (!(security_info & SECINFO_GROUP)) {
 888                 psd->group_sid = NULL;
 889         }
 890         if (!(security_info & SECINFO_DACL)) {
 891                 psd->type &= ~SEC_DESC_DACL_PRESENT;
 892                 psd->dacl = NULL;
 893         }
 894         if (!(security_info & SECINFO_SACL)) {
 895                 psd->type &= ~SEC_DESC_SACL_PRESENT;
 896                 psd->sacl = NULL;
 897         }
 898
 899         if (DEBUGLEVEL >= 10) {
 900                 DBG_DEBUG("returning acl for %s is:\n",
 901                           smb_fname_in->base_name);
 902                 NDR_PRINT_DEBUG(security_descriptor, psd);
 903         }
 904
 905         *ppdesc = psd;
 906
 907         return NT_STATUS_OK;
 908
 909 fail:
 910         TALLOC_FREE(psd);
 911         return status;
 912 }
 913
 914 /*********************************************************************
 915  Set the underlying ACL (e.g. POSIX ACLS, POSIX owner, etc)
 916 *********************************************************************/
 917 static NTSTATUS set_underlying_acl(vfs_handle_struct *handle, files_struct *fsp,
 918                                    struct security_descriptor *psd,
 919                                    uint32_t security_info_sent,
 920                                    bool chown_needed)
 921 {
 922         NTSTATUS status;
 923         const struct security_token *token = NULL;
 924         struct dom_sid_buf buf;
 925
 926         status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 927         if (!NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 928                 return status;
 929         }
 930
 931         /* We got access denied here. If we're already root,
 932            or we didn't need to do a chown, or the fsp isn't
 933            open with WRITE_OWNER access, just return. */
 934         if (get_current_uid(handle->conn) == 0 || chown_needed == false ||
 935             !(fsp->access_mask & SEC_STD_WRITE_OWNER)) {
 936                 return NT_STATUS_ACCESS_DENIED;
 937         }
 938
 939         /*
 940          * Only allow take-ownership, not give-ownership. That's the way Windows
 941          * implements SEC_STD_WRITE_OWNER. MS-FSA 2.1.5.16 just states: If
 942          * InputBuffer.OwnerSid is not a valid owner SID for a file in the
 943          * objectstore, as determined in an implementation specific manner, the
 944          * object store MUST return STATUS_INVALID_OWNER.
 945          */
 946         token = get_current_nttok(fsp->conn);
 947         if (!security_token_is_sid(token, psd->owner_sid)) {
 948                 return NT_STATUS_INVALID_OWNER;
 949         }
 950
 951         DBG_DEBUG("overriding chown on file %s for sid %s\n",
 952                   fsp_str_dbg(fsp),
 953                   dom_sid_str_buf(psd->owner_sid, &buf));
 954
 955         /* Ok, we failed to chown and we have
 956            SEC_STD_WRITE_OWNER access - override. */
 957         become_root();
 958         status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 959         unbecome_root();
 960
 961         return status;
 962 }
 963
 964 /*********************************************************************
 965  Store a v3 security descriptor
 966 *********************************************************************/
 967 static NTSTATUS store_v3_blob(
 968         NTSTATUS (*store_acl_blob_fsp_fn)(vfs_handle_struct *handle,
 969                                           files_struct *fsp,
 970                                           DATA_BLOB *pblob),
 971         vfs_handle_struct *handle, files_struct *fsp,
 972         struct security_descriptor *psd,
 973         struct security_descriptor *pdesc_next,
 974         uint8_t hash[XATTR_SD_HASH_SIZE])
 975 {
 976         NTSTATUS status;
 977         DATA_BLOB blob;
 978
 979         if (DEBUGLEVEL >= 10) {
 980                 DBG_DEBUG("storing xattr sd for file %s\n",
 981                           fsp_str_dbg(fsp));
 982                 NDR_PRINT_DEBUG(
 983                     security_descriptor,
 984                     discard_const_p(struct security_descriptor, psd));
 985
 986                 if (pdesc_next != NULL) {
 987                         DBG_DEBUG("storing xattr sd based on \n");
 988                         NDR_PRINT_DEBUG(
 989                             security_descriptor,
 990                             discard_const_p(struct security_descriptor,
 991                                             pdesc_next));
 992                 } else {
 993                         DBG_DEBUG("ignoring underlying sd\n");
 994                 }
 995         }
 996         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
 997         if (!NT_STATUS_IS_OK(status)) {
 998                 DBG_DEBUG("create_acl_blob failed\n");
 999                 return status;
1000         }
1001
1002         status = store_acl_blob_fsp_fn(handle, fsp, &blob);
1003         return status;
1004 }
1005
1006 /*********************************************************************
1007  Store a security descriptor given an fsp.
1008 *********************************************************************/
1009
1010 NTSTATUS fset_nt_acl_common(
1011         NTSTATUS (*fget_acl_blob_fn)(TALLOC_CTX *ctx,
1012                                     vfs_handle_struct *handle,
1013                                     files_struct *fsp,
1014                                     DATA_BLOB *pblob),
1015         NTSTATUS (*store_acl_blob_fsp_fn)(vfs_handle_struct *handle,
1016                                           files_struct *fsp,
1017                                           DATA_BLOB *pblob),
1018         const char *module_name,
1019         vfs_handle_struct *handle, files_struct *fsp,
1020         uint32_t security_info_sent,
1021         const struct security_descriptor *orig_psd)
1022 {
1023         NTSTATUS status;
1024         int ret;
1025         DATA_BLOB blob, sys_acl_blob;
1026         struct security_descriptor *pdesc_next = NULL;
1027         struct security_descriptor *psd = NULL;
1028         uint8_t hash[XATTR_SD_HASH_SIZE];
1029         uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE];
1030         bool chown_needed = false;
1031         char *sys_acl_description;
1032         TALLOC_CTX *frame = talloc_stackframe();
1033         bool ignore_file_system_acl = lp_parm_bool(
1034             SNUM(handle->conn), module_name, "ignore system acls", false);
1035
1036         if (DEBUGLEVEL >= 10) {
1037                 DBG_DEBUG("incoming sd for file %s\n", fsp_str_dbg(fsp));
1038                 NDR_PRINT_DEBUG(security_descriptor,
1039                         discard_const_p(struct security_descriptor, orig_psd));
1040         }
1041
1042         status = fget_nt_acl_common(fget_acl_blob_fn, handle, fsp,
1043                         SECINFO_OWNER|SECINFO_GROUP|SECINFO_DACL|SECINFO_SACL,
1044                                      frame,
1045                         &psd);
1046
1047         if (!NT_STATUS_IS_OK(status)) {
1048                 TALLOC_FREE(frame);
1049                 return status;
1050         }
1051
1052         psd->revision = orig_psd->revision;
1053         if (security_info_sent & SECINFO_DACL) {
1054                 psd->type = orig_psd->type;
1055                 /* All our SD's are self relative. */
1056                 psd->type |= SEC_DESC_SELF_RELATIVE;
1057         }
1058
1059         if ((security_info_sent & SECINFO_OWNER) && (orig_psd->owner_sid != NULL)) {
1060                 if (!dom_sid_equal(orig_psd->owner_sid, psd->owner_sid)) {
1061                         /* We're changing the owner. */
1062                         chown_needed = true;
1063                 }
1064                 psd->owner_sid = orig_psd->owner_sid;
1065         }
1066         if ((security_info_sent & SECINFO_GROUP) && (orig_psd->group_sid != NULL)) {
1067                 if (!dom_sid_equal(orig_psd->group_sid, psd->group_sid)) {
1068                         /* We're changing the group. */
1069                         chown_needed = true;
1070                 }
1071                 psd->group_sid = orig_psd->group_sid;
1072         }
1073         if (security_info_sent & SECINFO_DACL) {
1074                 if (security_descriptor_with_ms_nfs(orig_psd)) {
1075                         /*
1076                          * If the sd contains a MS NFS SID, do
1077                          * nothing, it's a chmod() request from OS X
1078                          * with AAPL context.
1079                          */
1080                         TALLOC_FREE(frame);
1081                         return NT_STATUS_OK;
1082                 }
1083                 psd->dacl = orig_psd->dacl;
1084                 psd->type |= SEC_DESC_DACL_PRESENT;
1085         }
1086         if (security_info_sent & SECINFO_SACL) {
1087                 psd->sacl = orig_psd->sacl;
1088                 psd->type |= SEC_DESC_SACL_PRESENT;
1089         }
1090
1091         if (ignore_file_system_acl) {
1092                 if (chown_needed) {
1093                         /* send only ownership stuff to lower layer */
1094                         security_info_sent &= (SECINFO_OWNER | SECINFO_GROUP);
1095                         status = set_underlying_acl(handle, fsp, psd,
1096                                                     security_info_sent, true);
1097                         if (!NT_STATUS_IS_OK(status)) {
1098                                 TALLOC_FREE(frame);
1099                                 return status;
1100                         }
1101                 }
1102                 ZERO_ARRAY(hash);
1103                 status = store_v3_blob(store_acl_blob_fsp_fn, handle, fsp, psd,
1104                                        NULL, hash);
1105
1106                 TALLOC_FREE(frame);
1107                 return status;
1108         }
1109
1110         status = set_underlying_acl(handle, fsp, psd, security_info_sent,
1111                                     chown_needed);
1112         if (!NT_STATUS_IS_OK(status)) {
1113                 TALLOC_FREE(frame);
1114                 return status;
1115         }
1116
1117         /* Get the full underlying sd, then hash. */
1118         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
1119                                           fsp,
1120                                           HASH_SECURITY_INFO,
1121                                           frame,
1122                                           &pdesc_next);
1123
1124         if (!NT_STATUS_IS_OK(status)) {
1125                 TALLOC_FREE(frame);
1126                 return status;
1127         }
1128
1129         status = hash_sd_sha256(pdesc_next, hash);
1130         if (!NT_STATUS_IS_OK(status)) {
1131                 TALLOC_FREE(frame);
1132                 return status;
1133         }
1134
1135         /* Get the full underlying sd, then hash. */
1136         ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle,
1137                                                fsp,
1138                                                frame,
1139                                                &sys_acl_description,
1140                                                &sys_acl_blob);
1141
1142         /* If we fail to get the ACL blob (for some reason) then this
1143          * is not fatal, we just work based on the NT ACL only */
1144         if (ret != 0) {
1145                 status = store_v3_blob(store_acl_blob_fsp_fn, handle, fsp, psd,
1146                                        pdesc_next, hash);
1147
1148                 TALLOC_FREE(frame);
1149                 return status;
1150         }
1151
1152         status = hash_blob_sha256(sys_acl_blob, sys_acl_hash);
1153         if (!NT_STATUS_IS_OK(status)) {
1154                 TALLOC_FREE(frame);
1155                 return status;
1156         }
1157
1158         if (DEBUGLEVEL >= 10) {
1159                 DBG_DEBUG("storing xattr sd for file %s based on system ACL\n",
1160                           fsp_str_dbg(fsp));
1161                 NDR_PRINT_DEBUG(security_descriptor,
1162                                 discard_const_p(struct security_descriptor, psd));
1163
1164                 DBG_DEBUG("storing hash in xattr sd based on system ACL and:\n");
1165                 NDR_PRINT_DEBUG(security_descriptor,
1166                                 discard_const_p(struct security_descriptor, pdesc_next));
1167         }
1168
1169         /* We store hashes of both the sys ACL blob and the NT
1170          * security desciptor mapped from that ACL so as to improve
1171          * our chances against some inadvertant change breaking the
1172          * hash used */
1173         status = create_sys_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash,
1174                                      sys_acl_description, sys_acl_hash);
1175         if (!NT_STATUS_IS_OK(status)) {
1176                 DBG_DEBUG("create_sys_acl_blob failed\n");
1177                 TALLOC_FREE(frame);
1178                 return status;
1179         }
1180
1181         status = store_acl_blob_fsp_fn(handle, fsp, &blob);
1182
1183         TALLOC_FREE(frame);
1184         return status;
1185 }
1186
1187 static int acl_common_remove_object(vfs_handle_struct *handle,
1188                                         const struct smb_filename *smb_fname,
1189                                         bool is_directory)
1190 {
1191         connection_struct *conn = handle->conn;
1192         struct file_id id;
1193         files_struct *fsp = NULL;
1194         int ret = 0;
1195         struct smb_filename *local_fname = NULL;
1196         struct smb_filename *parent_dir_fname = NULL;
1197         int saved_errno = 0;
1198         struct smb_filename *saved_dir_fname = NULL;
1199         bool ok;
1200
1201         saved_dir_fname = vfs_GetWd(talloc_tos(),conn);
1202         if (saved_dir_fname == NULL) {
1203                 saved_errno = errno;
1204                 goto out;
1205         }
1206
1207         ok = parent_smb_fname(talloc_tos(),
1208                               smb_fname,
1209                               &parent_dir_fname,
1210                               &local_fname);
1211         if (!ok) {
1212                 saved_errno = ENOMEM;
1213                 goto out;
1214         }
1215
1216         DBG_DEBUG("removing %s %s/%s\n", is_directory ? "directory" : "file",
1217                   smb_fname_str_dbg(parent_dir_fname),
1218                   smb_fname_str_dbg(local_fname));
1219
1220         /* cd into the parent dir to pin it. */
1221         ret = vfs_ChDir(conn, parent_dir_fname);
1222         if (ret == -1) {
1223                 saved_errno = errno;
1224                 goto out;
1225         }
1226
1227         /* Must use lstat here. */
1228         ret = SMB_VFS_LSTAT(conn, local_fname);
1229         if (ret == -1) {
1230                 saved_errno = errno;
1231                 goto out;
1232         }
1233
1234         /* Ensure we have this file open with DELETE access. */
1235         id = vfs_file_id_from_sbuf(conn, &local_fname->st);
1236         for (fsp = file_find_di_first(conn->sconn, id); fsp;
1237                      fsp = file_find_di_next(fsp)) {
1238                 if (fsp->access_mask & DELETE_ACCESS &&
1239                     fsp->fsp_flags.delete_on_close)
1240                 {
1241                         /* We did open this for delete,
1242                          * allow the delete as root.
1243                          */
1244                         break;
1245                 }
1246         }
1247
1248         if (!fsp) {
1249                 DBG_DEBUG("%s %s/%s not an open file\n",
1250                           is_directory ? "directory" : "file",
1251                           smb_fname_str_dbg(parent_dir_fname),
1252                           smb_fname_str_dbg(local_fname));
1253                 saved_errno = EACCES;
1254                 goto out;
1255         }
1256
1257         become_root();
1258         if (is_directory) {
1259                 ret = SMB_VFS_NEXT_UNLINKAT(handle,
1260                                 conn->cwd_fsp,
1261                                 local_fname,
1262                                 AT_REMOVEDIR);
1263         } else {
1264                 ret = SMB_VFS_NEXT_UNLINKAT(handle,
1265                                 conn->cwd_fsp,
1266                                 local_fname,
1267                                 0);
1268         }
1269         unbecome_root();
1270
1271         if (ret == -1) {
1272                 saved_errno = errno;
1273         }
1274
1275   out:
1276
1277         TALLOC_FREE(parent_dir_fname);
1278
1279         if (saved_dir_fname) {
1280                 vfs_ChDir(conn, saved_dir_fname);
1281                 TALLOC_FREE(saved_dir_fname);
1282         }
1283         if (saved_errno) {
1284                 errno = saved_errno;
1285         }
1286         return ret;
1287 }
1288
1289 int rmdir_acl_common(struct vfs_handle_struct *handle,
1290                 struct files_struct *dirfsp,
1291                 const struct smb_filename *smb_fname)
1292 {
1293         int ret;
1294
1295         /* Try the normal rmdir first. */
1296         ret = SMB_VFS_NEXT_UNLINKAT(handle,
1297                         dirfsp,
1298                         smb_fname,
1299                         AT_REMOVEDIR);
1300         if (ret == 0) {
1301                 return 0;
1302         }
1303         if (errno == EACCES || errno == EPERM) {
1304                 /* Failed due to access denied,
1305                    see if we need to root override. */
1306                 return acl_common_remove_object(handle,
1307                                                 smb_fname,
1308                                                 true);
1309         }
1310
1311         DBG_DEBUG("unlink of %s failed %s\n",
1312                   smb_fname->base_name,
1313                   strerror(errno));
1314         return -1;
1315 }
1316
1317 int unlink_acl_common(struct vfs_handle_struct *handle,
1318                         struct files_struct *dirfsp,
1319                         const struct smb_filename *smb_fname,
1320                         int flags)
1321 {
1322         int ret;
1323
1324         /* Try the normal unlink first. */
1325         ret = SMB_VFS_NEXT_UNLINKAT(handle,
1326                                 dirfsp,
1327                                 smb_fname,
1328                                 flags);
1329         if (ret == 0) {
1330                 return 0;
1331         }
1332         if (errno == EACCES || errno == EPERM) {
1333                 /* Failed due to access denied,
1334                    see if we need to root override. */
1335
1336                 /* Don't do anything fancy for streams. */
1337                 if (smb_fname->stream_name) {
1338                         return -1;
1339                 }
1340                 return acl_common_remove_object(handle,
1341                                         smb_fname,
1342                                         false);
1343         }
1344
1345         DBG_DEBUG("unlink of %s failed %s\n",
1346                   smb_fname->base_name,
1347                   strerror(errno));
1348         return -1;
1349 }
1350
1351 int chmod_acl_module_common(struct vfs_handle_struct *handle,
1352                             const struct smb_filename *smb_fname,
1353                             mode_t mode)
1354 {
1355         if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) {
1356                 /* Only allow this on POSIX pathnames. */
1357                 return SMB_VFS_NEXT_CHMOD(handle, smb_fname, mode);
1358         }
1359         return 0;
1360 }
1361
1362 int fchmod_acl_module_common(struct vfs_handle_struct *handle,
1363                              struct files_struct *fsp, mode_t mode)
1364 {
1365         if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
1366                 /* Only allow this on POSIX opens. */
1367                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1368         }
1369         return 0;
1370 }