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 enum default_acl_style {DEFAULT_ACL_POSIX, DEFAULT_ACL_WINDOWS};
  50
  51 static const struct enum_list default_acl_style[] = {
  52         {DEFAULT_ACL_POSIX,     "posix"},
  53         {DEFAULT_ACL_WINDOWS,   "windows"}
  54 };
  55
  56 struct acl_common_config {
  57         bool ignore_system_acls;
  58         enum default_acl_style default_acl_style;
  59 };
  60
  61 static bool init_acl_common_config(vfs_handle_struct *handle)
  62 {
  63         struct acl_common_config *config = NULL;
  64
  65         config = talloc_zero(handle->conn, struct acl_common_config);
  66         if (config == NULL) {
  67                 DBG_ERR("talloc_zero() failed\n");
  68                 errno = ENOMEM;
  69                 return false;
  70         }
  71
  72         config->ignore_system_acls = lp_parm_bool(SNUM(handle->conn),
  73                                                   ACL_MODULE_NAME,
  74                                                   "ignore system acls",
  75                                                   false);
  76         config->default_acl_style = lp_parm_enum(SNUM(handle->conn),
  77                                                  ACL_MODULE_NAME,
  78                                                  "default acl style",
  79                                                  default_acl_style,
  80                                                  DEFAULT_ACL_POSIX);
  81
  82         SMB_VFS_HANDLE_SET_DATA(handle, config, NULL,
  83                                 struct acl_common_config,
  84                                 return false);
  85
  86         return true;
  87 }
  88
  89
  90 /*******************************************************************
  91  Hash a security descriptor.
  92 *******************************************************************/
  93
  94 static NTSTATUS hash_blob_sha256(DATA_BLOB blob,
  95                                  uint8_t *hash)
  96 {
  97         SHA256_CTX tctx;
  98
  99         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 100
 101         samba_SHA256_Init(&tctx);
 102         samba_SHA256_Update(&tctx, blob.data, blob.length);
 103         samba_SHA256_Final(hash, &tctx);
 104
 105         return NT_STATUS_OK;
 106 }
 107
 108 /*******************************************************************
 109  Hash a security descriptor.
 110 *******************************************************************/
 111
 112 static NTSTATUS hash_sd_sha256(struct security_descriptor *psd,
 113                         uint8_t *hash)
 114 {
 115         DATA_BLOB blob;
 116         NTSTATUS status;
 117
 118         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 119         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
 120         if (!NT_STATUS_IS_OK(status)) {
 121                 return status;
 122         }
 123         return hash_blob_sha256(blob, hash);
 124 }
 125
 126 /*******************************************************************
 127  Parse out a struct security_descriptor from a DATA_BLOB.
 128 *******************************************************************/
 129
 130 static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
 131                                TALLOC_CTX *mem_ctx,
 132                                struct security_descriptor **ppdesc,
 133                                uint16_t *p_hash_type,
 134                                uint16_t *p_version,
 135                                uint8_t hash[XATTR_SD_HASH_SIZE],
 136                                uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE])
 137 {
 138         struct xattr_NTACL xacl;
 139         enum ndr_err_code ndr_err;
 140         size_t sd_size;
 141         TALLOC_CTX *frame = talloc_stackframe();
 142
 143         ndr_err = ndr_pull_struct_blob(pblob, frame, &xacl,
 144                         (ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
 145
 146         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 147                 DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
 148                         ndr_errstr(ndr_err)));
 149                 TALLOC_FREE(frame);
 150                 return ndr_map_error2ntstatus(ndr_err);
 151         }
 152
 153         *p_version = xacl.version;
 154
 155         switch (xacl.version) {
 156                 case 1:
 157                         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 158                                         xacl.info.sd->type | SEC_DESC_SELF_RELATIVE,
 159                                         xacl.info.sd->owner_sid,
 160                                         xacl.info.sd->group_sid,
 161                                         xacl.info.sd->sacl,
 162                                         xacl.info.sd->dacl,
 163                                         &sd_size);
 164                         /* No hash - null out. */
 165                         *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
 166                         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 167                         break;
 168                 case 2:
 169                         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 170                                         xacl.info.sd_hs2->sd->type | SEC_DESC_SELF_RELATIVE,
 171                                         xacl.info.sd_hs2->sd->owner_sid,
 172                                         xacl.info.sd_hs2->sd->group_sid,
 173                                         xacl.info.sd_hs2->sd->sacl,
 174                                         xacl.info.sd_hs2->sd->dacl,
 175                                         &sd_size);
 176                         /* No hash - null out. */
 177                         *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
 178                         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 179                         break;
 180                 case 3:
 181                         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 182                                         xacl.info.sd_hs3->sd->type | SEC_DESC_SELF_RELATIVE,
 183                                         xacl.info.sd_hs3->sd->owner_sid,
 184                                         xacl.info.sd_hs3->sd->group_sid,
 185                                         xacl.info.sd_hs3->sd->sacl,
 186                                         xacl.info.sd_hs3->sd->dacl,
 187                                         &sd_size);
 188                         *p_hash_type = xacl.info.sd_hs3->hash_type;
 189                         /* Current version 3 (if no sys acl hash available). */
 190                         memcpy(hash, xacl.info.sd_hs3->hash, XATTR_SD_HASH_SIZE);
 191                         break;
 192                 case 4:
 193                         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 194                                         xacl.info.sd_hs4->sd->type | SEC_DESC_SELF_RELATIVE,
 195                                         xacl.info.sd_hs4->sd->owner_sid,
 196                                         xacl.info.sd_hs4->sd->group_sid,
 197                                         xacl.info.sd_hs4->sd->sacl,
 198                                         xacl.info.sd_hs4->sd->dacl,
 199                                         &sd_size);
 200                         *p_hash_type = xacl.info.sd_hs4->hash_type;
 201                         /* Current version 4. */
 202                         memcpy(hash, xacl.info.sd_hs4->hash, XATTR_SD_HASH_SIZE);
 203                         memcpy(sys_acl_hash, xacl.info.sd_hs4->sys_acl_hash, XATTR_SD_HASH_SIZE);
 204                         break;
 205                 default:
 206                         TALLOC_FREE(frame);
 207                         return NT_STATUS_REVISION_MISMATCH;
 208         }
 209
 210         TALLOC_FREE(frame);
 211
 212         return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
 213 }
 214
 215 /*******************************************************************
 216  Create a DATA_BLOB from a hash of the security descriptor storead at
 217  the system layer and the NT ACL we wish to preserve
 218 *******************************************************************/
 219
 220 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
 221                         DATA_BLOB *pblob,
 222                         uint16_t hash_type,
 223                         uint8_t hash[XATTR_SD_HASH_SIZE])
 224 {
 225         struct xattr_NTACL xacl;
 226         struct security_descriptor_hash_v3 sd_hs3;
 227         enum ndr_err_code ndr_err;
 228         TALLOC_CTX *ctx = talloc_tos();
 229
 230         ZERO_STRUCT(xacl);
 231         ZERO_STRUCT(sd_hs3);
 232
 233         xacl.version = 3;
 234         xacl.info.sd_hs3 = &sd_hs3;
 235         xacl.info.sd_hs3->sd = discard_const_p(struct security_descriptor, psd);
 236         xacl.info.sd_hs3->hash_type = hash_type;
 237         memcpy(&xacl.info.sd_hs3->hash[0], hash, XATTR_SD_HASH_SIZE);
 238
 239         ndr_err = ndr_push_struct_blob(
 240                         pblob, ctx, &xacl,
 241                         (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
 242
 243         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 244                 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
 245                         ndr_errstr(ndr_err)));
 246                 return ndr_map_error2ntstatus(ndr_err);
 247         }
 248
 249         return NT_STATUS_OK;
 250 }
 251
 252 /*******************************************************************
 253  Create a DATA_BLOB from a hash of the security descriptors
 254  (system and NT) stored at the system layer and the NT ACL we wish
 255  to preserve.
 256 *******************************************************************/
 257
 258 static NTSTATUS create_sys_acl_blob(const struct security_descriptor *psd,
 259                                     DATA_BLOB *pblob,
 260                                     uint16_t hash_type,
 261                                     uint8_t hash[XATTR_SD_HASH_SIZE],
 262                                     const char *description,
 263                                     uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE])
 264 {
 265         struct xattr_NTACL xacl;
 266         struct security_descriptor_hash_v4 sd_hs4;
 267         enum ndr_err_code ndr_err;
 268         TALLOC_CTX *ctx = talloc_tos();
 269         NTTIME nttime_now;
 270         struct timeval now = timeval_current();
 271         nttime_now = timeval_to_nttime(&now);
 272
 273         ZERO_STRUCT(xacl);
 274         ZERO_STRUCT(sd_hs4);
 275
 276         xacl.version = 4;
 277         xacl.info.sd_hs4 = &sd_hs4;
 278         xacl.info.sd_hs4->sd = discard_const_p(struct security_descriptor, psd);
 279         xacl.info.sd_hs4->hash_type = hash_type;
 280         memcpy(&xacl.info.sd_hs4->hash[0], hash, XATTR_SD_HASH_SIZE);
 281         xacl.info.sd_hs4->description = description;
 282         xacl.info.sd_hs4->time = nttime_now;
 283         memcpy(&xacl.info.sd_hs4->sys_acl_hash[0], sys_acl_hash, XATTR_SD_HASH_SIZE);
 284
 285         ndr_err = ndr_push_struct_blob(
 286                         pblob, ctx, &xacl,
 287                         (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
 288
 289         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 290                 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
 291                         ndr_errstr(ndr_err)));
 292                 return ndr_map_error2ntstatus(ndr_err);
 293         }
 294
 295         return NT_STATUS_OK;
 296 }
 297
 298 /*******************************************************************
 299  Add in 3 inheritable components for a non-inheritable directory ACL.
 300  CREATOR_OWNER/CREATOR_GROUP/WORLD.
 301 *******************************************************************/
 302
 303 static NTSTATUS add_directory_inheritable_components(vfs_handle_struct *handle,
 304                                 const char *name,
 305                                 SMB_STRUCT_STAT *psbuf,
 306                                 struct security_descriptor *psd)
 307 {
 308         struct connection_struct *conn = handle->conn;
 309         int num_aces = (psd->dacl ? psd->dacl->num_aces : 0);
 310         struct smb_filename smb_fname;
 311         enum security_ace_type acltype;
 312         uint32_t access_mask;
 313         mode_t dir_mode;
 314         mode_t file_mode;
 315         mode_t mode;
 316         struct security_ace *new_ace_list;
 317
 318         if (psd->dacl) {
 319                 new_ace_list = talloc_zero_array(psd->dacl,
 320                                                  struct security_ace,
 321                                                  num_aces + 3);
 322         } else {
 323                 /*
 324                  * make_sec_acl() at the bottom of this function
 325                  * dupliates new_ace_list
 326                  */
 327                 new_ace_list = talloc_zero_array(talloc_tos(),
 328                                                  struct security_ace,
 329                                                  num_aces + 3);
 330         }
 331
 332         if (new_ace_list == NULL) {
 333                 return NT_STATUS_NO_MEMORY;
 334         }
 335
 336         /* Fake a quick smb_filename. */
 337         ZERO_STRUCT(smb_fname);
 338         smb_fname.st = *psbuf;
 339         smb_fname.base_name = discard_const_p(char, name);
 340
 341         dir_mode = unix_mode(conn,
 342                         FILE_ATTRIBUTE_DIRECTORY, &smb_fname, NULL);
 343         file_mode = unix_mode(conn,
 344                         FILE_ATTRIBUTE_ARCHIVE, &smb_fname, NULL);
 345
 346         mode = dir_mode | file_mode;
 347
 348         DEBUG(10, ("add_directory_inheritable_components: directory %s, "
 349                 "mode = 0%o\n",
 350                 name,
 351                 (unsigned int)mode ));
 352
 353         if (num_aces) {
 354                 memcpy(new_ace_list, psd->dacl->aces,
 355                         num_aces * sizeof(struct security_ace));
 356         }
 357         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 358                                 mode & 0700, false);
 359
 360         init_sec_ace(&new_ace_list[num_aces],
 361                         &global_sid_Creator_Owner,
 362                         acltype,
 363                         access_mask,
 364                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 365                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 366                                 SEC_ACE_FLAG_INHERIT_ONLY);
 367         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 368                                 (mode << 3) & 0700, false);
 369         init_sec_ace(&new_ace_list[num_aces+1],
 370                         &global_sid_Creator_Group,
 371                         acltype,
 372                         access_mask,
 373                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 374                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 375                                 SEC_ACE_FLAG_INHERIT_ONLY);
 376         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 377                                 (mode << 6) & 0700, false);
 378         init_sec_ace(&new_ace_list[num_aces+2],
 379                         &global_sid_World,
 380                         acltype,
 381                         access_mask,
 382                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 383                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 384                                 SEC_ACE_FLAG_INHERIT_ONLY);
 385         if (psd->dacl) {
 386                 psd->dacl->aces = new_ace_list;
 387                 psd->dacl->num_aces += 3;
 388                 psd->dacl->size += new_ace_list[num_aces].size +
 389                         new_ace_list[num_aces+1].size +
 390                         new_ace_list[num_aces+2].size;
 391         } else {
 392                 psd->dacl = make_sec_acl(psd,
 393                                 NT4_ACL_REVISION,
 394                                 3,
 395                                 new_ace_list);
 396                 if (psd->dacl == NULL) {
 397                         return NT_STATUS_NO_MEMORY;
 398                 }
 399         }
 400         return NT_STATUS_OK;
 401 }
 402
 403 static NTSTATUS make_default_acl_posix(TALLOC_CTX *ctx,
 404                                        const char *name,
 405                                        SMB_STRUCT_STAT *psbuf,
 406                                        struct security_descriptor **ppdesc)
 407 {
 408         struct dom_sid owner_sid, group_sid;
 409         size_t size = 0;
 410         struct security_ace aces[4];
 411         uint32_t access_mask = 0;
 412         mode_t mode = psbuf->st_ex_mode;
 413         struct security_acl *new_dacl = NULL;
 414         int idx = 0;
 415
 416         DBG_DEBUG("file %s mode = 0%o\n",name, (int)mode);
 417
 418         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
 419         gid_to_sid(&group_sid, psbuf->st_ex_gid);
 420
 421         /*
 422          We provide up to 4 ACEs
 423                 - Owner
 424                 - Group
 425                 - Everyone
 426                 - NT System
 427         */
 428
 429         if (mode & S_IRUSR) {
 430                 if (mode & S_IWUSR) {
 431                         access_mask |= SEC_RIGHTS_FILE_ALL;
 432                 } else {
 433                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
 434                 }
 435         }
 436         if (mode & S_IWUSR) {
 437                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
 438         }
 439
 440         init_sec_ace(&aces[idx],
 441                         &owner_sid,
 442                         SEC_ACE_TYPE_ACCESS_ALLOWED,
 443                         access_mask,
 444                         0);
 445         idx++;
 446
 447         access_mask = 0;
 448         if (mode & S_IRGRP) {
 449                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
 450         }
 451         if (mode & S_IWGRP) {
 452                 /* note that delete is not granted - this matches posix behaviour */
 453                 access_mask |= SEC_RIGHTS_FILE_WRITE;
 454         }
 455         if (access_mask) {
 456                 init_sec_ace(&aces[idx],
 457                         &group_sid,
 458                         SEC_ACE_TYPE_ACCESS_ALLOWED,
 459                         access_mask,
 460                         0);
 461                 idx++;
 462         }
 463
 464         access_mask = 0;
 465         if (mode & S_IROTH) {
 466                 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
 467         }
 468         if (mode & S_IWOTH) {
 469                 access_mask |= SEC_RIGHTS_FILE_WRITE;
 470         }
 471         if (access_mask) {
 472                 init_sec_ace(&aces[idx],
 473                         &global_sid_World,
 474                         SEC_ACE_TYPE_ACCESS_ALLOWED,
 475                         access_mask,
 476                         0);
 477                 idx++;
 478         }
 479
 480         init_sec_ace(&aces[idx],
 481                         &global_sid_System,
 482                         SEC_ACE_TYPE_ACCESS_ALLOWED,
 483                         SEC_RIGHTS_FILE_ALL,
 484                         0);
 485         idx++;
 486
 487         new_dacl = make_sec_acl(ctx,
 488                         NT4_ACL_REVISION,
 489                         idx,
 490                         aces);
 491
 492         if (!new_dacl) {
 493                 return NT_STATUS_NO_MEMORY;
 494         }
 495
 496         *ppdesc = make_sec_desc(ctx,
 497                         SECURITY_DESCRIPTOR_REVISION_1,
 498                         SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
 499                         &owner_sid,
 500                         &group_sid,
 501                         NULL,
 502                         new_dacl,
 503                         &size);
 504         if (!*ppdesc) {
 505                 return NT_STATUS_NO_MEMORY;
 506         }
 507         return NT_STATUS_OK;
 508 }
 509
 510 static NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
 511                                             struct acl_common_config *config,
 512                                             const char *name,
 513                                             SMB_STRUCT_STAT *psbuf,
 514                                             struct security_descriptor **ppdesc)
 515 {
 516         NTSTATUS status;
 517
 518         switch (config->default_acl_style) {
 519
 520         case DEFAULT_ACL_POSIX:
 521                 status =  make_default_acl_posix(ctx, name, psbuf, ppdesc);
 522                 break;
 523
 524         default:
 525                 DBG_ERR("unknown acl style %d", config->default_acl_style);
 526                 status = NT_STATUS_INTERNAL_ERROR;
 527                 break;
 528         }
 529
 530         return status;
 531 }
 532
 533 /**
 534  * Validate an ACL blob
 535  *
 536  * This validates an ACL blob against the underlying filesystem ACL. If this
 537  * function returns NT_STATUS_OK ppsd can be
 538  *
 539  * 1. the ACL from the blob (psd_from_fs=false), or
 540  * 2. the ACL from the fs (psd_from_fs=true), or
 541  * 3. NULL (!)
 542  *
 543  * If the return value is anything else then NT_STATUS_OK, ppsd is set to NULL
 544  * and psd_from_fs set to false.
 545  *
 546  * Returning the underlying filesystem ACL in case no. 2 is really just an
 547  * optimisation, because some validations have to fetch the filesytem ACL as
 548  * part of the validation, so we already have it available and callers might
 549  * need it as well.
 550  **/
 551 static NTSTATUS validate_nt_acl_blob(TALLOC_CTX *mem_ctx,
 552                                      vfs_handle_struct *handle,
 553                                      files_struct *fsp,
 554                                      const struct smb_filename *smb_fname,
 555                                      const DATA_BLOB *blob,
 556                                      struct security_descriptor **ppsd,
 557                                      bool *psd_is_from_fs)
 558 {
 559         NTSTATUS status;
 560         uint16_t hash_type = XATTR_SD_HASH_TYPE_NONE;
 561         uint16_t xattr_version = 0;
 562         uint8_t hash[XATTR_SD_HASH_SIZE];
 563         uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE];
 564         uint8_t hash_tmp[XATTR_SD_HASH_SIZE];
 565         uint8_t sys_acl_hash_tmp[XATTR_SD_HASH_SIZE];
 566         struct security_descriptor *psd = NULL;
 567         struct security_descriptor *psd_blob = NULL;
 568         struct security_descriptor *psd_fs = NULL;
 569         char *sys_acl_blob_description = NULL;
 570         DATA_BLOB sys_acl_blob = { 0 };
 571         struct acl_common_config *config = NULL;
 572
 573         *ppsd = NULL;
 574         *psd_is_from_fs = false;
 575
 576         SMB_VFS_HANDLE_GET_DATA(handle, config,
 577                                 struct acl_common_config,
 578                                 return NT_STATUS_UNSUCCESSFUL);
 579
 580         status = parse_acl_blob(blob,
 581                                 mem_ctx,
 582                                 &psd_blob,
 583                                 &hash_type,
 584                                 &xattr_version,
 585                                 &hash[0],
 586                                 &sys_acl_hash[0]);
 587         if (!NT_STATUS_IS_OK(status)) {
 588                 DBG_DEBUG("parse_acl_blob returned %s\n", nt_errstr(status));
 589                 goto fail;
 590         }
 591
 592         /* determine which type of xattr we got */
 593         switch (xattr_version) {
 594         case 1:
 595         case 2:
 596                 /* These xattr types are unilatteral, they do not
 597                  * require confirmation of the hash.  In particular,
 598                  * the NTVFS file server uses version 1, but
 599                  * 'samba-tool ntacl' can set these as well */
 600                 *ppsd = psd_blob;
 601                 return NT_STATUS_OK;
 602         case 3:
 603         case 4:
 604                 if (config->ignore_system_acls) {
 605                         *ppsd = psd_blob;
 606                         return NT_STATUS_OK;
 607                 }
 608
 609                 break;
 610         default:
 611                 DBG_DEBUG("ACL blob revision mismatch (%u) for file %s\n",
 612                           (unsigned int)hash_type, smb_fname->base_name);
 613                 TALLOC_FREE(psd_blob);
 614                 return NT_STATUS_OK;
 615         }
 616
 617         /* determine which type of xattr we got */
 618         if (hash_type != XATTR_SD_HASH_TYPE_SHA256) {
 619                 DBG_DEBUG("ACL blob hash type (%u) unexpected for file %s\n",
 620                           (unsigned int)hash_type, smb_fname->base_name);
 621                 TALLOC_FREE(psd_blob);
 622                 return NT_STATUS_OK;
 623         }
 624
 625         /* determine which type of xattr we got */
 626         switch (xattr_version) {
 627         case 4:
 628         {
 629                 int ret;
 630                 if (fsp) {
 631                         /* Get the full underlying sd, then hash. */
 632                         ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle,
 633                                                                fsp,
 634                                                                mem_ctx,
 635                                                                &sys_acl_blob_description,
 636                                                                &sys_acl_blob);
 637                 } else {
 638                         /* Get the full underlying sd, then hash. */
 639                         ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FILE(handle,
 640                                                  smb_fname->base_name,
 641                                                  mem_ctx,
 642                                                  &sys_acl_blob_description,
 643                                                  &sys_acl_blob);
 644                 }
 645
 646                 /* If we fail to get the ACL blob (for some reason) then this
 647                  * is not fatal, we just work based on the NT ACL only */
 648                 if (ret == 0) {
 649                         status = hash_blob_sha256(sys_acl_blob, sys_acl_hash_tmp);
 650                         if (!NT_STATUS_IS_OK(status)) {
 651                                 goto fail;
 652                         }
 653
 654                         TALLOC_FREE(sys_acl_blob_description);
 655                         TALLOC_FREE(sys_acl_blob.data);
 656
 657                         if (memcmp(&sys_acl_hash[0], &sys_acl_hash_tmp[0],
 658                                    XATTR_SD_HASH_SIZE) == 0) {
 659                                 /* Hash matches, return blob sd. */
 660                                 DBG_DEBUG("blob hash matches for file %s\n",
 661                                           smb_fname->base_name);
 662                                 *ppsd = psd_blob;
 663                                 return NT_STATUS_OK;
 664                         }
 665                 }
 666
 667                 /* Otherwise, fall though and see if the NT ACL hash matches */
 668         }
 669         case 3:
 670                 /* Get the full underlying sd for the hash
 671                    or to return as backup. */
 672                 if (fsp) {
 673                         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 674                                                           fsp,
 675                                                           HASH_SECURITY_INFO,
 676                                                           mem_ctx,
 677                                                           &psd_fs);
 678                 } else {
 679                         status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 680                                                          smb_fname,
 681                                                          HASH_SECURITY_INFO,
 682                                                          mem_ctx,
 683                                                          &psd_fs);
 684                 }
 685
 686                 if (!NT_STATUS_IS_OK(status)) {
 687                         DBG_DEBUG("get_next_acl for file %s returned %s\n",
 688                                   smb_fname->base_name, nt_errstr(status));
 689                         goto fail;
 690                 }
 691
 692                 status = hash_sd_sha256(psd_fs, hash_tmp);
 693                 if (!NT_STATUS_IS_OK(status)) {
 694                         TALLOC_FREE(psd_blob);
 695                         *ppsd = psd_fs;
 696                         *psd_is_from_fs = true;
 697                         return NT_STATUS_OK;
 698                 }
 699
 700                 if (memcmp(&hash[0], &hash_tmp[0], XATTR_SD_HASH_SIZE) == 0) {
 701                         /* Hash matches, return blob sd. */
 702                         DBG_DEBUG("blob hash matches for file %s\n",
 703                                   smb_fname->base_name);
 704                         *ppsd = psd_blob;
 705                         return NT_STATUS_OK;
 706                 }
 707
 708                 /* Hash doesn't match, return underlying sd. */
 709                 DBG_DEBUG("blob hash does not match for file %s - returning "
 710                           "file system SD mapping.\n",
 711                           smb_fname->base_name);
 712
 713                 if (DEBUGLEVEL >= 10) {
 714                         DBG_DEBUG("acl for blob hash for %s is:\n",
 715                                   smb_fname->base_name);
 716                         NDR_PRINT_DEBUG(security_descriptor, psd_fs);
 717                 }
 718
 719                 TALLOC_FREE(psd_blob);
 720                 *ppsd = psd_fs;
 721                 *psd_is_from_fs = true;
 722         }
 723
 724         return NT_STATUS_OK;
 725
 726 fail:
 727         TALLOC_FREE(psd);
 728         TALLOC_FREE(psd_blob);
 729         TALLOC_FREE(psd_fs);
 730         TALLOC_FREE(sys_acl_blob_description);
 731         TALLOC_FREE(sys_acl_blob.data);
 732         return status;
 733 }
 734
 735 static NTSTATUS stat_fsp_or_smb_fname(vfs_handle_struct *handle,
 736                                       files_struct *fsp,
 737                                       const struct smb_filename *smb_fname,
 738                                       SMB_STRUCT_STAT *sbuf,
 739                                       SMB_STRUCT_STAT **psbuf)
 740 {
 741         NTSTATUS status;
 742         int ret;
 743
 744         if (fsp) {
 745                 status = vfs_stat_fsp(fsp);
 746                 if (!NT_STATUS_IS_OK(status)) {
 747                         return status;
 748                 }
 749                 *psbuf = &fsp->fsp_name->st;
 750         } else {
 751                 /*
 752                  * https://bugzilla.samba.org/show_bug.cgi?id=11249
 753                  *
 754                  * We are currently guaranteed that 'name' here is a
 755                  * smb_fname->base_name, which *cannot* contain a stream name
 756                  * (':'). vfs_stat_smb_fname() splits a name into a base name +
 757                  * stream name, which when we get here we know we've already
 758                  * done.  So we have to call the stat or lstat VFS calls
 759                  * directly here. Else, a base_name that contains a ':' (from a
 760                  * demangled name) will get split again.
 761                  *
 762                  * FIXME.
 763                  * This uglyness will go away once smb_fname is fully plumbed
 764                  * through the VFS.
 765                  */
 766                 ret = vfs_stat_smb_basename(handle->conn,
 767                                             smb_fname,
 768                                             sbuf);
 769                 if (ret == -1) {
 770                         return map_nt_error_from_unix(errno);
 771                 }
 772         }
 773
 774         return NT_STATUS_OK;
 775 }
 776
 777 /*******************************************************************
 778  Pull a DATA_BLOB from an xattr given a pathname.
 779  If the hash doesn't match, or doesn't exist - return the underlying
 780  filesystem sd.
 781 *******************************************************************/
 782
 783 static NTSTATUS get_nt_acl_internal(vfs_handle_struct *handle,
 784                                     files_struct *fsp,
 785                                     const struct smb_filename *smb_fname_in,
 786                                     uint32_t security_info,
 787                                     TALLOC_CTX *mem_ctx,
 788                                     struct security_descriptor **ppdesc)
 789 {
 790         DATA_BLOB blob = data_blob_null;
 791         NTSTATUS status;
 792         struct security_descriptor *psd = NULL;
 793         const struct smb_filename *smb_fname = NULL;
 794         bool psd_is_from_fs = false;
 795         struct acl_common_config *config = NULL;
 796
 797         SMB_VFS_HANDLE_GET_DATA(handle, config,
 798                                 struct acl_common_config,
 799                                 return NT_STATUS_UNSUCCESSFUL);
 800
 801         if (fsp && smb_fname_in == NULL) {
 802                 smb_fname = fsp->fsp_name;
 803         } else {
 804                 smb_fname = smb_fname_in;
 805         }
 806
 807         DEBUG(10, ("get_nt_acl_internal: name=%s\n", smb_fname->base_name));
 808
 809         status = get_acl_blob(mem_ctx, handle, fsp, smb_fname, &blob);
 810         if (NT_STATUS_IS_OK(status)) {
 811                 status = validate_nt_acl_blob(mem_ctx,
 812                                               handle,
 813                                               fsp,
 814                                               smb_fname,
 815                                               &blob,
 816                                               &psd,
 817                                               &psd_is_from_fs);
 818                 TALLOC_FREE(blob.data);
 819                 if (!NT_STATUS_IS_OK(status)) {
 820                         DBG_DEBUG("ACL validation for [%s] failed\n",
 821                                   smb_fname->base_name);
 822                         goto fail;
 823                 }
 824         }
 825
 826         if (psd == NULL) {
 827                 /* Get the full underlying sd, as we failed to get the
 828                  * blob for the hash, or the revision/hash type wasn't
 829                  * known */
 830
 831                 if (config->ignore_system_acls) {
 832                         SMB_STRUCT_STAT sbuf;
 833                         SMB_STRUCT_STAT *psbuf = &sbuf;
 834
 835                         status = stat_fsp_or_smb_fname(handle, fsp, smb_fname,
 836                                                        &sbuf, &psbuf);
 837                         if (!NT_STATUS_IS_OK(status)) {
 838                                 goto fail;
 839                         }
 840
 841                         status = make_default_filesystem_acl(
 842                                 mem_ctx,
 843                                 config,
 844                                 smb_fname->base_name,
 845                                 psbuf,
 846                                 &psd);
 847                         if (!NT_STATUS_IS_OK(status)) {
 848                                 goto fail;
 849                         }
 850                 } else {
 851                         if (fsp) {
 852                                 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 853                                                                   fsp,
 854                                                                   security_info,
 855                                                                   mem_ctx,
 856                                                                   &psd);
 857                         } else {
 858                                 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 859                                                                  smb_fname,
 860                                                                  security_info,
 861                                                                  mem_ctx,
 862                                                                  &psd);
 863                         }
 864
 865                         if (!NT_STATUS_IS_OK(status)) {
 866                                 DBG_DEBUG("get_next_acl for file %s "
 867                                           "returned %s\n",
 868                                           smb_fname->base_name,
 869                                           nt_errstr(status));
 870                                 goto fail;
 871                         }
 872
 873                         psd_is_from_fs = true;
 874                 }
 875         }
 876
 877         if (psd_is_from_fs) {
 878                 SMB_STRUCT_STAT sbuf;
 879                 SMB_STRUCT_STAT *psbuf = &sbuf;
 880                 bool is_directory = false;
 881
 882                 /*
 883                  * We're returning the underlying ACL from the
 884                  * filesystem. If it's a directory, and has no
 885                  * inheritable ACE entries we have to fake them.
 886                  */
 887
 888                 status = stat_fsp_or_smb_fname(handle, fsp, smb_fname,
 889                                                &sbuf, &psbuf);
 890                 if (!NT_STATUS_IS_OK(status)) {
 891                         goto fail;
 892                 }
 893
 894                 is_directory = S_ISDIR(psbuf->st_ex_mode);
 895
 896                 if (is_directory && !sd_has_inheritable_components(psd, true)) {
 897                         status = add_directory_inheritable_components(
 898                                 handle,
 899                                 smb_fname->base_name,
 900                                 psbuf,
 901                                 psd);
 902                         if (!NT_STATUS_IS_OK(status)) {
 903                                 goto fail;
 904                         }
 905                 }
 906
 907                 /*
 908                  * The underlying POSIX module always sets the
 909                  * ~SEC_DESC_DACL_PROTECTED bit, as ACLs can't be inherited in
 910                  * this way under POSIX. Remove it for Windows-style ACLs.
 911                  */
 912                 psd->type &= ~SEC_DESC_DACL_PROTECTED;
 913         }
 914
 915         if (!(security_info & SECINFO_OWNER)) {
 916                 psd->owner_sid = NULL;
 917         }
 918         if (!(security_info & SECINFO_GROUP)) {
 919                 psd->group_sid = NULL;
 920         }
 921         if (!(security_info & SECINFO_DACL)) {
 922                 psd->type &= ~SEC_DESC_DACL_PRESENT;
 923                 psd->dacl = NULL;
 924         }
 925         if (!(security_info & SECINFO_SACL)) {
 926                 psd->type &= ~SEC_DESC_SACL_PRESENT;
 927                 psd->sacl = NULL;
 928         }
 929
 930         if (DEBUGLEVEL >= 10) {
 931                 DEBUG(10,("get_nt_acl_internal: returning acl for %s is:\n",
 932                         smb_fname->base_name ));
 933                 NDR_PRINT_DEBUG(security_descriptor, psd);
 934         }
 935
 936         *ppdesc = psd;
 937
 938         return NT_STATUS_OK;
 939
 940 fail:
 941         TALLOC_FREE(psd);
 942         return status;
 943 }
 944
 945 /*********************************************************************
 946  Fetch a security descriptor given an fsp.
 947 *********************************************************************/
 948
 949 static NTSTATUS fget_nt_acl_common(vfs_handle_struct *handle,
 950                                    files_struct *fsp,
 951                                    uint32_t security_info,
 952                                    TALLOC_CTX *mem_ctx,
 953                                    struct security_descriptor **ppdesc)
 954 {
 955         return get_nt_acl_internal(handle, fsp,
 956                                    NULL, security_info, mem_ctx, ppdesc);
 957 }
 958
 959 /*********************************************************************
 960  Fetch a security descriptor given a pathname.
 961 *********************************************************************/
 962
 963 static NTSTATUS get_nt_acl_common(vfs_handle_struct *handle,
 964                                   const struct smb_filename *smb_fname,
 965                                   uint32_t security_info,
 966                                   TALLOC_CTX *mem_ctx,
 967                                   struct security_descriptor **ppdesc)
 968 {
 969         return get_nt_acl_internal(handle,
 970                                 NULL,
 971                                 smb_fname,
 972                                 security_info,
 973                                 mem_ctx,
 974                                 ppdesc);
 975 }
 976
 977 /*********************************************************************
 978  Set the underlying ACL (e.g. POSIX ACLS, POSIX owner, etc)
 979 *********************************************************************/
 980 static NTSTATUS set_underlying_acl(vfs_handle_struct *handle, files_struct *fsp,
 981                                    struct security_descriptor *psd,
 982                                    uint32_t security_info_sent,
 983                                    bool chown_needed)
 984 {
 985         NTSTATUS status =
 986             SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 987         if (!NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 988                 return status;
 989         }
 990
 991         /* We got access denied here. If we're already root,
 992            or we didn't need to do a chown, or the fsp isn't
 993            open with WRITE_OWNER access, just return. */
 994         if (get_current_uid(handle->conn) == 0 || chown_needed == false ||
 995             !(fsp->access_mask & SEC_STD_WRITE_OWNER)) {
 996                 return NT_STATUS_ACCESS_DENIED;
 997         }
 998
 999         DEBUG(10, ("fset_nt_acl_common: overriding chown on file %s "
1000                    "for sid %s\n",
1001                    fsp_str_dbg(fsp), sid_string_tos(psd->owner_sid)));
1002
1003         /* Ok, we failed to chown and we have
1004            SEC_STD_WRITE_OWNER access - override. */
1005         become_root();
1006         status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
1007         unbecome_root();
1008
1009         return status;
1010 }
1011
1012 /*********************************************************************
1013  Store a v3 security descriptor
1014 *********************************************************************/
1015 static NTSTATUS store_v3_blob(vfs_handle_struct *handle, files_struct *fsp,
1016                               struct security_descriptor *psd,
1017                               struct security_descriptor *pdesc_next,
1018                               uint8_t hash[XATTR_SD_HASH_SIZE])
1019 {
1020         NTSTATUS status;
1021         DATA_BLOB blob;
1022
1023         if (DEBUGLEVEL >= 10) {
1024                 DEBUG(10, ("fset_nt_acl_xattr: storing xattr sd for file %s\n",
1025                            fsp_str_dbg(fsp)));
1026                 NDR_PRINT_DEBUG(
1027                     security_descriptor,
1028                     discard_const_p(struct security_descriptor, psd));
1029
1030                 if (pdesc_next != NULL) {
1031                         DEBUG(10, ("fset_nt_acl_xattr: storing has in xattr sd "
1032                                    "based on \n"));
1033                         NDR_PRINT_DEBUG(
1034                             security_descriptor,
1035                             discard_const_p(struct security_descriptor,
1036                                             pdesc_next));
1037                 } else {
1038                         DEBUG(10,
1039                               ("fset_nt_acl_xattr: ignoring underlying sd\n"));
1040                 }
1041         }
1042         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
1043         if (!NT_STATUS_IS_OK(status)) {
1044                 DEBUG(10, ("fset_nt_acl_xattr: create_acl_blob failed\n"));
1045                 return status;
1046         }
1047
1048         status = store_acl_blob_fsp(handle, fsp, &blob);
1049         return status;
1050 }
1051
1052 /*********************************************************************
1053  Store a security descriptor given an fsp.
1054 *********************************************************************/
1055
1056 static NTSTATUS fset_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
1057         uint32_t security_info_sent, const struct security_descriptor *orig_psd)
1058 {
1059         NTSTATUS status;
1060         int ret;
1061         DATA_BLOB blob, sys_acl_blob;
1062         struct security_descriptor *pdesc_next = NULL;
1063         struct security_descriptor *psd = NULL;
1064         uint8_t hash[XATTR_SD_HASH_SIZE];
1065         uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE];
1066         bool chown_needed = false;
1067         char *sys_acl_description;
1068         TALLOC_CTX *frame = talloc_stackframe();
1069         bool ignore_file_system_acl = lp_parm_bool(
1070             SNUM(handle->conn), ACL_MODULE_NAME, "ignore system acls", false);
1071
1072         if (DEBUGLEVEL >= 10) {
1073                 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
1074                           fsp_str_dbg(fsp)));
1075                 NDR_PRINT_DEBUG(security_descriptor,
1076                         discard_const_p(struct security_descriptor, orig_psd));
1077         }
1078
1079         status = get_nt_acl_internal(handle, fsp,
1080                         NULL,
1081                         SECINFO_OWNER|SECINFO_GROUP|SECINFO_DACL|SECINFO_SACL,
1082                                      frame,
1083                         &psd);
1084
1085         if (!NT_STATUS_IS_OK(status)) {
1086                 TALLOC_FREE(frame);
1087                 return status;
1088         }
1089
1090         psd->revision = orig_psd->revision;
1091         /* All our SD's are self relative. */
1092         psd->type = orig_psd->type | SEC_DESC_SELF_RELATIVE;
1093
1094         if ((security_info_sent & SECINFO_OWNER) && (orig_psd->owner_sid != NULL)) {
1095                 if (!dom_sid_equal(orig_psd->owner_sid, psd->owner_sid)) {
1096                         /* We're changing the owner. */
1097                         chown_needed = true;
1098                 }
1099                 psd->owner_sid = orig_psd->owner_sid;
1100         }
1101         if ((security_info_sent & SECINFO_GROUP) && (orig_psd->group_sid != NULL)) {
1102                 if (!dom_sid_equal(orig_psd->group_sid, psd->group_sid)) {
1103                         /* We're changing the group. */
1104                         chown_needed = true;
1105                 }
1106                 psd->group_sid = orig_psd->group_sid;
1107         }
1108         if (security_info_sent & SECINFO_DACL) {
1109                 if (security_descriptor_with_ms_nfs(orig_psd)) {
1110                         /*
1111                          * If the sd contains a MS NFS SID, do
1112                          * nothing, it's a chmod() request from OS X
1113                          * with AAPL context.
1114                          */
1115                         TALLOC_FREE(frame);
1116                         return NT_STATUS_OK;
1117                 }
1118                 psd->dacl = orig_psd->dacl;
1119                 psd->type |= SEC_DESC_DACL_PRESENT;
1120         }
1121         if (security_info_sent & SECINFO_SACL) {
1122                 psd->sacl = orig_psd->sacl;
1123                 psd->type |= SEC_DESC_SACL_PRESENT;
1124         }
1125
1126         if (ignore_file_system_acl) {
1127                 if (chown_needed) {
1128                         /* send only ownership stuff to lower layer */
1129                         security_info_sent &= (SECINFO_OWNER | SECINFO_GROUP);
1130                         status = set_underlying_acl(handle, fsp, psd,
1131                                                     security_info_sent, true);
1132                         if (!NT_STATUS_IS_OK(status)) {
1133                                 TALLOC_FREE(frame);
1134                                 return status;
1135                         }
1136                 }
1137                 ZERO_ARRAY(hash);
1138                 status = store_v3_blob(handle, fsp, psd, NULL, hash);
1139
1140                 TALLOC_FREE(frame);
1141                 return status;
1142         }
1143
1144         status = set_underlying_acl(handle, fsp, psd, security_info_sent,
1145                                     chown_needed);
1146         if (!NT_STATUS_IS_OK(status)) {
1147                 TALLOC_FREE(frame);
1148                 return status;
1149         }
1150
1151         /* Get the full underlying sd, then hash. */
1152         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
1153                                           fsp,
1154                                           HASH_SECURITY_INFO,
1155                                           frame,
1156                                           &pdesc_next);
1157
1158         if (!NT_STATUS_IS_OK(status)) {
1159                 TALLOC_FREE(frame);
1160                 return status;
1161         }
1162
1163         status = hash_sd_sha256(pdesc_next, hash);
1164         if (!NT_STATUS_IS_OK(status)) {
1165                 TALLOC_FREE(frame);
1166                 return status;
1167         }
1168
1169         /* Get the full underlying sd, then hash. */
1170         ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle,
1171                                                fsp,
1172                                                frame,
1173                                                &sys_acl_description,
1174                                                &sys_acl_blob);
1175
1176         /* If we fail to get the ACL blob (for some reason) then this
1177          * is not fatal, we just work based on the NT ACL only */
1178         if (ret != 0) {
1179                 status = store_v3_blob(handle, fsp, psd, pdesc_next, hash);
1180
1181                 TALLOC_FREE(frame);
1182                 return status;
1183         }
1184
1185         status = hash_blob_sha256(sys_acl_blob, sys_acl_hash);
1186         if (!NT_STATUS_IS_OK(status)) {
1187                 TALLOC_FREE(frame);
1188                 return status;
1189         }
1190
1191         if (DEBUGLEVEL >= 10) {
1192                 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s based on system ACL\n",
1193                           fsp_str_dbg(fsp)));
1194                 NDR_PRINT_DEBUG(security_descriptor,
1195                                 discard_const_p(struct security_descriptor, psd));
1196
1197                 DEBUG(10,("fset_nt_acl_xattr: storing hash in xattr sd based on system ACL and:\n"));
1198                 NDR_PRINT_DEBUG(security_descriptor,
1199                                 discard_const_p(struct security_descriptor, pdesc_next));
1200         }
1201
1202         /* We store hashes of both the sys ACL blob and the NT
1203          * security desciptor mapped from that ACL so as to improve
1204          * our chances against some inadvertant change breaking the
1205          * hash used */
1206         status = create_sys_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash,
1207                                      sys_acl_description, sys_acl_hash);
1208         if (!NT_STATUS_IS_OK(status)) {
1209                 DEBUG(10, ("fset_nt_acl_xattr: create_sys_acl_blob failed\n"));
1210                 TALLOC_FREE(frame);
1211                 return status;
1212         }
1213
1214         status = store_acl_blob_fsp(handle, fsp, &blob);
1215
1216         TALLOC_FREE(frame);
1217         return status;
1218 }
1219
1220 static int acl_common_remove_object(vfs_handle_struct *handle,
1221                                         const char *path,
1222                                         bool is_directory)
1223 {
1224         connection_struct *conn = handle->conn;
1225         struct file_id id;
1226         files_struct *fsp = NULL;
1227         int ret = 0;
1228         char *parent_dir = NULL;
1229         const char *final_component = NULL;
1230         struct smb_filename local_fname;
1231         int saved_errno = 0;
1232         char *saved_dir = NULL;
1233
1234         saved_dir = vfs_GetWd(talloc_tos(),conn);
1235         if (!saved_dir) {
1236                 saved_errno = errno;
1237                 goto out;
1238         }
1239
1240         if (!parent_dirname(talloc_tos(), path,
1241                         &parent_dir, &final_component)) {
1242                 saved_errno = ENOMEM;
1243                 goto out;
1244         }
1245
1246         DEBUG(10,("acl_common_remove_object: removing %s %s/%s\n",
1247                 is_directory ? "directory" : "file",
1248                 parent_dir, final_component ));
1249
1250         /* cd into the parent dir to pin it. */
1251         ret = vfs_ChDir(conn, parent_dir);
1252         if (ret == -1) {
1253                 saved_errno = errno;
1254                 goto out;
1255         }
1256
1257         ZERO_STRUCT(local_fname);
1258         local_fname.base_name = discard_const_p(char, final_component);
1259
1260         /* Must use lstat here. */
1261         ret = SMB_VFS_LSTAT(conn, &local_fname);
1262         if (ret == -1) {
1263                 saved_errno = errno;
1264                 goto out;
1265         }
1266
1267         /* Ensure we have this file open with DELETE access. */
1268         id = vfs_file_id_from_sbuf(conn, &local_fname.st);
1269         for (fsp = file_find_di_first(conn->sconn, id); fsp;
1270                      fsp = file_find_di_next(fsp)) {
1271                 if (fsp->access_mask & DELETE_ACCESS &&
1272                                 fsp->delete_on_close) {
1273                         /* We did open this for delete,
1274                          * allow the delete as root.
1275                          */
1276                         break;
1277                 }
1278         }
1279
1280         if (!fsp) {
1281                 DEBUG(10,("acl_common_remove_object: %s %s/%s "
1282                         "not an open file\n",
1283                         is_directory ? "directory" : "file",
1284                         parent_dir, final_component ));
1285                 saved_errno = EACCES;
1286                 goto out;
1287         }
1288
1289         become_root();
1290         if (is_directory) {
1291                 ret = SMB_VFS_NEXT_RMDIR(handle, &local_fname);
1292         } else {
1293                 ret = SMB_VFS_NEXT_UNLINK(handle, &local_fname);
1294         }
1295         unbecome_root();
1296
1297         if (ret == -1) {
1298                 saved_errno = errno;
1299         }
1300
1301   out:
1302
1303         TALLOC_FREE(parent_dir);
1304
1305         if (saved_dir) {
1306                 vfs_ChDir(conn, saved_dir);
1307         }
1308         if (saved_errno) {
1309                 errno = saved_errno;
1310         }
1311         return ret;
1312 }
1313
1314 static int rmdir_acl_common(struct vfs_handle_struct *handle,
1315                                 const struct smb_filename *smb_fname)
1316 {
1317         int ret;
1318
1319         /* Try the normal rmdir first. */
1320         ret = SMB_VFS_NEXT_RMDIR(handle, smb_fname);
1321         if (ret == 0) {
1322                 return 0;
1323         }
1324         if (errno == EACCES || errno == EPERM) {
1325                 /* Failed due to access denied,
1326                    see if we need to root override. */
1327                 return acl_common_remove_object(handle,
1328                                                 smb_fname->base_name,
1329                                                 true);
1330         }
1331
1332         DEBUG(10,("rmdir_acl_common: unlink of %s failed %s\n",
1333                 smb_fname->base_name,
1334                 strerror(errno) ));
1335         return -1;
1336 }
1337
1338 static int unlink_acl_common(struct vfs_handle_struct *handle,
1339                         const struct smb_filename *smb_fname)
1340 {
1341         int ret;
1342
1343         /* Try the normal unlink first. */
1344         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
1345         if (ret == 0) {
1346                 return 0;
1347         }
1348         if (errno == EACCES || errno == EPERM) {
1349                 /* Failed due to access denied,
1350                    see if we need to root override. */
1351
1352                 /* Don't do anything fancy for streams. */
1353                 if (smb_fname->stream_name) {
1354                         return -1;
1355                 }
1356                 return acl_common_remove_object(handle,
1357                                         smb_fname->base_name,
1358                                         false);
1359         }
1360
1361         DEBUG(10,("unlink_acl_common: unlink of %s failed %s\n",
1362                 smb_fname->base_name,
1363                 strerror(errno) ));
1364         return -1;
1365 }
1366
1367 static int chmod_acl_module_common(struct vfs_handle_struct *handle,
1368                         const struct smb_filename *smb_fname,
1369                         mode_t mode)
1370 {
1371         if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) {
1372                 /* Only allow this on POSIX pathnames. */
1373                 return SMB_VFS_NEXT_CHMOD(handle, smb_fname, mode);
1374         }
1375         return 0;
1376 }
1377
1378 static int fchmod_acl_module_common(struct vfs_handle_struct *handle,
1379                         struct files_struct *fsp, mode_t mode)
1380 {
1381         if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
1382                 /* Only allow this on POSIX opens. */
1383                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1384         }
1385         return 0;
1386 }
1387
1388 static int chmod_acl_acl_module_common(struct vfs_handle_struct *handle,
1389                         const struct smb_filename *smb_fname,
1390                         mode_t mode)
1391 {
1392         if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) {
1393                 /* Only allow this on POSIX pathnames. */
1394                 return SMB_VFS_NEXT_CHMOD_ACL(handle, smb_fname, mode);
1395         }
1396         return 0;
1397 }
1398
1399 static int fchmod_acl_acl_module_common(struct vfs_handle_struct *handle,
1400                         struct files_struct *fsp, mode_t mode)
1401 {
1402         if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
1403                 /* Only allow this on POSIX opens. */
1404                 return SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);
1405         }
1406         return 0;
1407 }