source3/modules/vfs_acl_common.c

   1 /*
   2  * Store Windows ACLs in data store - common functions.
   3  * #included into modules/vfs_acl_xattr.c and modules/vfs_acl_tdb.c
   4  *
   5  * Copyright (C) Volker Lendecke, 2008
   6  * Copyright (C) Jeremy Allison, 2009
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "smbd/smbd.h"
  23 #include "system/filesys.h"
  24 #include "../libcli/security/security.h"
  25 #include "../librpc/gen_ndr/ndr_security.h"
  26 #include "../lib/util/bitmap.h"
  27
  28 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
  29                         DATA_BLOB *pblob,
  30                         uint16_t hash_type,
  31                         uint8_t hash[XATTR_SD_HASH_SIZE]);
  32
  33 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
  34                         vfs_handle_struct *handle,
  35                         files_struct *fsp,
  36                         const char *name,
  37                         DATA_BLOB *pblob);
  38
  39 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
  40                         files_struct *fsp,
  41                         DATA_BLOB *pblob);
  42
  43 #define HASH_SECURITY_INFO (SECINFO_OWNER | \
  44                                 SECINFO_GROUP | \
  45                                 SECINFO_DACL | \
  46                                 SECINFO_SACL)
  47
  48 /*******************************************************************
  49  Hash a security descriptor.
  50 *******************************************************************/
  51
  52 static NTSTATUS hash_blob_sha256(DATA_BLOB blob,
  53                                  uint8_t *hash)
  54 {
  55         SHA256_CTX tctx;
  56
  57         memset(hash, '\0', XATTR_SD_HASH_SIZE);
  58
  59         samba_SHA256_Init(&tctx);
  60         samba_SHA256_Update(&tctx, blob.data, blob.length);
  61         samba_SHA256_Final(hash, &tctx);
  62
  63         return NT_STATUS_OK;
  64 }
  65
  66 /*******************************************************************
  67  Hash a security descriptor.
  68 *******************************************************************/
  69
  70 static NTSTATUS hash_sd_sha256(struct security_descriptor *psd,
  71                         uint8_t *hash)
  72 {
  73         DATA_BLOB blob;
  74         NTSTATUS status;
  75
  76         memset(hash, '\0', XATTR_SD_HASH_SIZE);
  77         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
  78         if (!NT_STATUS_IS_OK(status)) {
  79                 return status;
  80         }
  81         return hash_blob_sha256(blob, hash);
  82 }
  83
  84 /*******************************************************************
  85  Parse out a struct security_descriptor from a DATA_BLOB.
  86 *******************************************************************/
  87
  88 static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
  89                                TALLOC_CTX *mem_ctx,
  90                                 struct security_descriptor **ppdesc,
  91                                 uint16_t *p_hash_type,
  92                                 uint8_t hash[XATTR_SD_HASH_SIZE])
  93 {
  94         struct xattr_NTACL xacl;
  95         enum ndr_err_code ndr_err;
  96         size_t sd_size;
  97         TALLOC_CTX *frame = talloc_stackframe();
  98
  99         ndr_err = ndr_pull_struct_blob(pblob, frame, &xacl,
 100                         (ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
 101
 102         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 103                 DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
 104                         ndr_errstr(ndr_err)));
 105                 TALLOC_FREE(frame);
 106                 return ndr_map_error2ntstatus(ndr_err);
 107         }
 108
 109         switch (xacl.version) {
 110                 case 1:
 111                         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 112                                         xacl.info.sd->type | SEC_DESC_SELF_RELATIVE,
 113                                         xacl.info.sd->owner_sid,
 114                                         xacl.info.sd->group_sid,
 115                                         xacl.info.sd->sacl,
 116                                         xacl.info.sd->dacl,
 117                                         &sd_size);
 118                         /* No hash - null out. */
 119                         *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
 120                         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 121                         break;
 122                 case 2:
 123                         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 124                                         xacl.info.sd_hs2->sd->type | SEC_DESC_SELF_RELATIVE,
 125                                         xacl.info.sd_hs2->sd->owner_sid,
 126                                         xacl.info.sd_hs2->sd->group_sid,
 127                                         xacl.info.sd_hs2->sd->sacl,
 128                                         xacl.info.sd_hs2->sd->dacl,
 129                                         &sd_size);
 130                         /* No hash - null out. */
 131                         *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
 132                         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 133                         break;
 134                 case 3:
 135                         *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
 136                                         xacl.info.sd_hs3->sd->type | SEC_DESC_SELF_RELATIVE,
 137                                         xacl.info.sd_hs3->sd->owner_sid,
 138                                         xacl.info.sd_hs3->sd->group_sid,
 139                                         xacl.info.sd_hs3->sd->sacl,
 140                                         xacl.info.sd_hs3->sd->dacl,
 141                                         &sd_size);
 142                         *p_hash_type = xacl.info.sd_hs3->hash_type;
 143                         /* Current version 3. */
 144                         memcpy(hash, xacl.info.sd_hs3->hash, XATTR_SD_HASH_SIZE);
 145                         break;
 146                 default:
 147                         TALLOC_FREE(frame);
 148                         return NT_STATUS_REVISION_MISMATCH;
 149         }
 150
 151         TALLOC_FREE(frame);
 152
 153         return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
 154 }
 155
 156 /*******************************************************************
 157  Create a DATA_BLOB from a security descriptor.
 158 *******************************************************************/
 159
 160 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
 161                         DATA_BLOB *pblob,
 162                         uint16_t hash_type,
 163                         uint8_t hash[XATTR_SD_HASH_SIZE])
 164 {
 165         struct xattr_NTACL xacl;
 166         struct security_descriptor_hash_v3 sd_hs3;
 167         enum ndr_err_code ndr_err;
 168         TALLOC_CTX *ctx = talloc_tos();
 169
 170         ZERO_STRUCT(xacl);
 171         ZERO_STRUCT(sd_hs3);
 172
 173         xacl.version = 3;
 174         xacl.info.sd_hs3 = &sd_hs3;
 175         xacl.info.sd_hs3->sd = discard_const_p(struct security_descriptor, psd);
 176         xacl.info.sd_hs3->hash_type = hash_type;
 177         memcpy(&xacl.info.sd_hs3->hash[0], hash, XATTR_SD_HASH_SIZE);
 178
 179         ndr_err = ndr_push_struct_blob(
 180                         pblob, ctx, &xacl,
 181                         (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
 182
 183         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 184                 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
 185                         ndr_errstr(ndr_err)));
 186                 return ndr_map_error2ntstatus(ndr_err);
 187         }
 188
 189         return NT_STATUS_OK;
 190 }
 191
 192 /*******************************************************************
 193  Add in 3 inheritable components for a non-inheritable directory ACL.
 194  CREATOR_OWNER/CREATOR_GROUP/WORLD.
 195 *******************************************************************/
 196
 197 static NTSTATUS add_directory_inheritable_components(vfs_handle_struct *handle,
 198                                 const char *name,
 199                                 SMB_STRUCT_STAT *psbuf,
 200                                 struct security_descriptor *psd)
 201 {
 202         struct connection_struct *conn = handle->conn;
 203         int num_aces = (psd->dacl ? psd->dacl->num_aces : 0);
 204         struct smb_filename smb_fname;
 205         enum security_ace_type acltype;
 206         uint32_t access_mask;
 207         mode_t dir_mode;
 208         mode_t file_mode;
 209         mode_t mode;
 210         struct security_ace *new_ace_list;
 211
 212         if (psd->dacl) {
 213                 new_ace_list = talloc_zero_array(psd->dacl,
 214                                                  struct security_ace,
 215                                                  num_aces + 3);
 216         } else {
 217                 /*
 218                  * make_sec_acl() at the bottom of this function
 219                  * dupliates new_ace_list
 220                  */
 221                 new_ace_list = talloc_zero_array(talloc_tos(),
 222                                                  struct security_ace,
 223                                                  num_aces + 3);
 224         }
 225
 226         if (new_ace_list == NULL) {
 227                 return NT_STATUS_NO_MEMORY;
 228         }
 229
 230         /* Fake a quick smb_filename. */
 231         ZERO_STRUCT(smb_fname);
 232         smb_fname.st = *psbuf;
 233         smb_fname.base_name = discard_const_p(char, name);
 234
 235         dir_mode = unix_mode(conn,
 236                         FILE_ATTRIBUTE_DIRECTORY, &smb_fname, NULL);
 237         file_mode = unix_mode(conn,
 238                         FILE_ATTRIBUTE_ARCHIVE, &smb_fname, NULL);
 239
 240         mode = dir_mode | file_mode;
 241
 242         DEBUG(10, ("add_directory_inheritable_components: directory %s, "
 243                 "mode = 0%o\n",
 244                 name,
 245                 (unsigned int)mode ));
 246
 247         if (num_aces) {
 248                 memcpy(new_ace_list, psd->dacl->aces,
 249                         num_aces * sizeof(struct security_ace));
 250         }
 251         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 252                                 mode & 0700, false);
 253
 254         init_sec_ace(&new_ace_list[num_aces],
 255                         &global_sid_Creator_Owner,
 256                         acltype,
 257                         access_mask,
 258                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 259                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 260                                 SEC_ACE_FLAG_INHERIT_ONLY);
 261         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 262                                 (mode << 3) & 0700, false);
 263         init_sec_ace(&new_ace_list[num_aces+1],
 264                         &global_sid_Creator_Group,
 265                         acltype,
 266                         access_mask,
 267                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 268                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 269                                 SEC_ACE_FLAG_INHERIT_ONLY);
 270         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 271                                 (mode << 6) & 0700, false);
 272         init_sec_ace(&new_ace_list[num_aces+2],
 273                         &global_sid_World,
 274                         acltype,
 275                         access_mask,
 276                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 277                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 278                                 SEC_ACE_FLAG_INHERIT_ONLY);
 279         if (psd->dacl) {
 280                 psd->dacl->aces = new_ace_list;
 281                 psd->dacl->num_aces += 3;
 282         } else {
 283                 psd->dacl = make_sec_acl(psd,
 284                                 NT4_ACL_REVISION,
 285                                 3,
 286                                 new_ace_list);
 287                 if (psd->dacl == NULL) {
 288                         return NT_STATUS_NO_MEMORY;
 289                 }
 290         }
 291         return NT_STATUS_OK;
 292 }
 293
 294 /*******************************************************************
 295  Pull a DATA_BLOB from an xattr given a pathname.
 296  If the hash doesn't match, or doesn't exist - return the underlying
 297  filesystem sd.
 298 *******************************************************************/
 299
 300 static NTSTATUS get_nt_acl_internal(vfs_handle_struct *handle,
 301                                 files_struct *fsp,
 302                                 const char *name,
 303                                 uint32_t security_info,
 304                                 TALLOC_CTX *mem_ctx,
 305                                     struct security_descriptor **ppdesc)
 306 {
 307         DATA_BLOB blob = data_blob_null;
 308         NTSTATUS status;
 309         uint16_t hash_type = XATTR_SD_HASH_TYPE_NONE;
 310         uint8_t hash[XATTR_SD_HASH_SIZE];
 311         uint8_t hash_tmp[XATTR_SD_HASH_SIZE];
 312         struct security_descriptor *psd = NULL;
 313         struct security_descriptor *pdesc_next = NULL;
 314         bool ignore_file_system_acl = lp_parm_bool(SNUM(handle->conn),
 315                                                 ACL_MODULE_NAME,
 316                                                 "ignore system acls",
 317                                                 false);
 318
 319         if (fsp && name == NULL) {
 320                 name = fsp->fsp_name->base_name;
 321         }
 322
 323         DEBUG(10, ("get_nt_acl_internal: name=%s\n", name));
 324
 325         /* Get the full underlying sd for the hash
 326            or to return as backup. */
 327         if (fsp) {
 328                 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 329                                                   fsp,
 330                                                   HASH_SECURITY_INFO,
 331                                                   mem_ctx,
 332                                                   &pdesc_next);
 333         } else {
 334                 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 335                                                  name,
 336                                                  HASH_SECURITY_INFO,
 337                                                  mem_ctx,
 338                                                  &pdesc_next);
 339         }
 340
 341         if (!NT_STATUS_IS_OK(status)) {
 342                 DEBUG(10, ("get_nt_acl_internal: get_next_acl for file %s "
 343                         "returned %s\n",
 344                         name,
 345                         nt_errstr(status)));
 346                 return status;
 347         }
 348
 349         status = get_acl_blob(talloc_tos(), handle, fsp, name, &blob);
 350         if (!NT_STATUS_IS_OK(status)) {
 351                 DEBUG(10, ("get_nt_acl_internal: get_acl_blob returned %s\n",
 352                         nt_errstr(status)));
 353                 psd = pdesc_next;
 354                 goto out;
 355         }
 356
 357         status = parse_acl_blob(&blob, mem_ctx, &psd,
 358                                 &hash_type, &hash[0]);
 359         if (!NT_STATUS_IS_OK(status)) {
 360                 DEBUG(10, ("parse_acl_blob returned %s\n",
 361                                 nt_errstr(status)));
 362                 psd = pdesc_next;
 363                 goto out;
 364         }
 365
 366         /* Ensure the hash type is one we know. */
 367         switch (hash_type) {
 368                 case XATTR_SD_HASH_TYPE_NONE:
 369                         /* No hash, just return blob sd. */
 370                         goto out;
 371                 case XATTR_SD_HASH_TYPE_SHA256:
 372                         break;
 373                 default:
 374                         DEBUG(10, ("get_nt_acl_internal: ACL blob revision "
 375                                 "mismatch (%u) for file %s\n",
 376                                 (unsigned int)hash_type,
 377                                 name));
 378                         TALLOC_FREE(psd);
 379                         psd = pdesc_next;
 380                         goto out;
 381         }
 382
 383         if (ignore_file_system_acl) {
 384                 goto out;
 385         }
 386
 387         status = hash_sd_sha256(pdesc_next, hash_tmp);
 388         if (!NT_STATUS_IS_OK(status)) {
 389                 TALLOC_FREE(psd);
 390                 psd = pdesc_next;
 391                 goto out;
 392         }
 393
 394         if (memcmp(&hash[0], &hash_tmp[0], XATTR_SD_HASH_SIZE) == 0) {
 395                 /* Hash matches, return blob sd. */
 396                 DEBUG(10, ("get_nt_acl_internal: blob hash "
 397                         "matches for file %s\n",
 398                         name ));
 399                 goto out;
 400         }
 401
 402         /* Hash doesn't match, return underlying sd. */
 403         DEBUG(10, ("get_nt_acl_internal: blob hash "
 404                 "does not match for file %s - returning "
 405                 "file system SD mapping.\n",
 406                 name ));
 407
 408         if (DEBUGLEVEL >= 10) {
 409                 DEBUG(10,("get_nt_acl_internal: acl for blob hash for %s is:\n",
 410                         name ));
 411                 NDR_PRINT_DEBUG(security_descriptor, pdesc_next);
 412         }
 413
 414         TALLOC_FREE(psd);
 415         psd = pdesc_next;
 416
 417   out:
 418
 419         if (psd != pdesc_next) {
 420                 /* We're returning the blob, throw
 421                  * away the filesystem SD. */
 422                 TALLOC_FREE(pdesc_next);
 423         } else {
 424                 SMB_STRUCT_STAT sbuf;
 425                 SMB_STRUCT_STAT *psbuf = &sbuf;
 426                 bool is_directory = false;
 427                 /*
 428                  * We're returning the underlying ACL from the
 429                  * filesystem. If it's a directory, and has no
 430                  * inheritable ACE entries we have to fake them.
 431                  */
 432                 if (fsp) {
 433                         status = vfs_stat_fsp(fsp);
 434                         if (!NT_STATUS_IS_OK(status)) {
 435                                 return status;
 436                         }
 437                         psbuf = &fsp->fsp_name->st;
 438                 } else {
 439                         int ret = vfs_stat_smb_fname(handle->conn,
 440                                                 name,
 441                                                 &sbuf);
 442                         if (ret == -1) {
 443                                 return map_nt_error_from_unix(errno);
 444                         }
 445                 }
 446                 is_directory = S_ISDIR(psbuf->st_ex_mode);
 447
 448                 if (ignore_file_system_acl) {
 449                         TALLOC_FREE(pdesc_next);
 450                         status = make_default_filesystem_acl(mem_ctx,
 451                                                 name,
 452                                                 psbuf,
 453                                                 &psd);
 454                         if (!NT_STATUS_IS_OK(status)) {
 455                                 return status;
 456                         }
 457                 } else {
 458                         if (is_directory &&
 459                                 !sd_has_inheritable_components(psd,
 460                                                         true)) {
 461                                 status = add_directory_inheritable_components(
 462                                                         handle,
 463                                                         name,
 464                                                         psbuf,
 465                                                         psd);
 466                                 if (!NT_STATUS_IS_OK(status)) {
 467                                         return status;
 468                                 }
 469                         }
 470                         /* The underlying POSIX module always sets
 471                            the ~SEC_DESC_DACL_PROTECTED bit, as ACLs
 472                            can't be inherited in this way under POSIX.
 473                            Remove it for Windows-style ACLs. */
 474                         psd->type &= ~SEC_DESC_DACL_PROTECTED;
 475                 }
 476         }
 477
 478         if (!(security_info & SECINFO_OWNER)) {
 479                 psd->owner_sid = NULL;
 480         }
 481         if (!(security_info & SECINFO_GROUP)) {
 482                 psd->group_sid = NULL;
 483         }
 484         if (!(security_info & SECINFO_DACL)) {
 485                 psd->type &= ~SEC_DESC_DACL_PRESENT;
 486                 psd->dacl = NULL;
 487         }
 488         if (!(security_info & SECINFO_SACL)) {
 489                 psd->type &= ~SEC_DESC_SACL_PRESENT;
 490                 psd->sacl = NULL;
 491         }
 492
 493         TALLOC_FREE(blob.data);
 494         *ppdesc = psd;
 495
 496         if (DEBUGLEVEL >= 10) {
 497                 DEBUG(10,("get_nt_acl_internal: returning acl for %s is:\n",
 498                         name ));
 499                 NDR_PRINT_DEBUG(security_descriptor, psd);
 500         }
 501
 502         return NT_STATUS_OK;
 503 }
 504
 505 /*********************************************************************
 506  Fetch a security descriptor given an fsp.
 507 *********************************************************************/
 508
 509 static NTSTATUS fget_nt_acl_common(vfs_handle_struct *handle,
 510                                    files_struct *fsp,
 511                                    uint32_t security_info,
 512                                    TALLOC_CTX *mem_ctx,
 513                                    struct security_descriptor **ppdesc)
 514 {
 515         return get_nt_acl_internal(handle, fsp,
 516                                    NULL, security_info, mem_ctx, ppdesc);
 517 }
 518
 519 /*********************************************************************
 520  Fetch a security descriptor given a pathname.
 521 *********************************************************************/
 522
 523 static NTSTATUS get_nt_acl_common(vfs_handle_struct *handle,
 524                                   const char *name,
 525                                   uint32_t security_info,
 526                                   TALLOC_CTX *mem_ctx,
 527                                   struct security_descriptor **ppdesc)
 528 {
 529         return get_nt_acl_internal(handle, NULL,
 530                                    name, security_info, mem_ctx, ppdesc);
 531 }
 532
 533 /*********************************************************************
 534  Store a security descriptor given an fsp.
 535 *********************************************************************/
 536
 537 static NTSTATUS fset_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
 538         uint32_t security_info_sent, const struct security_descriptor *orig_psd)
 539 {
 540         NTSTATUS status;
 541         DATA_BLOB blob;
 542         struct security_descriptor *pdesc_next = NULL;
 543         struct security_descriptor *psd = NULL;
 544         uint8_t hash[XATTR_SD_HASH_SIZE];
 545         bool chown_needed = false;
 546         TALLOC_CTX *frame = talloc_stackframe();
 547
 548         if (DEBUGLEVEL >= 10) {
 549                 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
 550                           fsp_str_dbg(fsp)));
 551                 NDR_PRINT_DEBUG(security_descriptor,
 552                         discard_const_p(struct security_descriptor, orig_psd));
 553         }
 554
 555         status = get_nt_acl_internal(handle, fsp,
 556                         NULL,
 557                         SECINFO_OWNER|SECINFO_GROUP|SECINFO_DACL|SECINFO_SACL,
 558                                      frame,
 559                         &psd);
 560
 561         if (!NT_STATUS_IS_OK(status)) {
 562                 TALLOC_FREE(frame);
 563                 return status;
 564         }
 565
 566         psd->revision = orig_psd->revision;
 567         /* All our SD's are self relative. */
 568         psd->type = orig_psd->type | SEC_DESC_SELF_RELATIVE;
 569
 570         if ((security_info_sent & SECINFO_OWNER) && (orig_psd->owner_sid != NULL)) {
 571                 if (!dom_sid_equal(orig_psd->owner_sid, psd->owner_sid)) {
 572                         /* We're changing the owner. */
 573                         chown_needed = true;
 574                 }
 575                 psd->owner_sid = orig_psd->owner_sid;
 576         }
 577         if ((security_info_sent & SECINFO_GROUP) && (orig_psd->group_sid != NULL)) {
 578                 if (!dom_sid_equal(orig_psd->group_sid, psd->group_sid)) {
 579                         /* We're changing the group. */
 580                         chown_needed = true;
 581                 }
 582                 psd->group_sid = orig_psd->group_sid;
 583         }
 584         if (security_info_sent & SECINFO_DACL) {
 585                 psd->dacl = orig_psd->dacl;
 586                 psd->type |= SEC_DESC_DACL_PRESENT;
 587         }
 588         if (security_info_sent & SECINFO_SACL) {
 589                 psd->sacl = orig_psd->sacl;
 590                 psd->type |= SEC_DESC_SACL_PRESENT;
 591         }
 592
 593         status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 594         if (!NT_STATUS_IS_OK(status)) {
 595                 if (!NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 596                         TALLOC_FREE(frame);
 597                         return status;
 598                 }
 599                 /* We got access denied here. If we're already root,
 600                    or we didn't need to do a chown, or the fsp isn't
 601                    open with WRITE_OWNER access, just return. */
 602                 if (get_current_uid(handle->conn) == 0 ||
 603                                 chown_needed == false ||
 604                                 !(fsp->access_mask & SEC_STD_WRITE_OWNER)) {
 605                         TALLOC_FREE(frame);
 606                         return NT_STATUS_ACCESS_DENIED;
 607                 }
 608
 609                 DEBUG(10,("fset_nt_acl_common: overriding chown on file %s "
 610                         "for sid %s\n",
 611                         fsp_str_dbg(fsp),
 612                         sid_string_tos(psd->owner_sid)
 613                         ));
 614
 615                 /* Ok, we failed to chown and we have
 616                    SEC_STD_WRITE_OWNER access - override. */
 617                 become_root();
 618                 status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp,
 619                                 security_info_sent, psd);
 620                 unbecome_root();
 621                 if (!NT_STATUS_IS_OK(status)) {
 622                         TALLOC_FREE(frame);
 623                         return status;
 624                 }
 625         }
 626
 627         /* Get the full underlying sd, then hash. */
 628         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 629                                           fsp,
 630                                           HASH_SECURITY_INFO,
 631                                           frame,
 632                                           &pdesc_next);
 633
 634         if (!NT_STATUS_IS_OK(status)) {
 635                 TALLOC_FREE(frame);
 636                 return status;
 637         }
 638
 639         status = hash_sd_sha256(pdesc_next, hash);
 640         if (!NT_STATUS_IS_OK(status)) {
 641                 TALLOC_FREE(frame);
 642                 return status;
 643         }
 644
 645         if (DEBUGLEVEL >= 10) {
 646                 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
 647                           fsp_str_dbg(fsp)));
 648                 NDR_PRINT_DEBUG(security_descriptor,
 649                         discard_const_p(struct security_descriptor, psd));
 650
 651                 DEBUG(10,("fset_nt_acl_xattr: storing has in xattr sd based on \n"));
 652                 NDR_PRINT_DEBUG(security_descriptor,
 653                         discard_const_p(struct security_descriptor, pdesc_next));
 654         }
 655         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
 656         if (!NT_STATUS_IS_OK(status)) {
 657                 DEBUG(10, ("fset_nt_acl_xattr: create_acl_blob failed\n"));
 658                 TALLOC_FREE(frame);
 659                 return status;
 660         }
 661
 662         status = store_acl_blob_fsp(handle, fsp, &blob);
 663
 664         TALLOC_FREE(frame);
 665         return status;
 666 }
 667
 668 static int acl_common_remove_object(vfs_handle_struct *handle,
 669                                         const char *path,
 670                                         bool is_directory)
 671 {
 672         connection_struct *conn = handle->conn;
 673         struct file_id id;
 674         files_struct *fsp = NULL;
 675         int ret = 0;
 676         char *parent_dir = NULL;
 677         const char *final_component = NULL;
 678         struct smb_filename local_fname;
 679         int saved_errno = 0;
 680         char *saved_dir = NULL;
 681
 682         saved_dir = vfs_GetWd(talloc_tos(),conn);
 683         if (!saved_dir) {
 684                 saved_errno = errno;
 685                 goto out;
 686         }
 687
 688         if (!parent_dirname(talloc_tos(), path,
 689                         &parent_dir, &final_component)) {
 690                 saved_errno = ENOMEM;
 691                 goto out;
 692         }
 693
 694         DEBUG(10,("acl_common_remove_object: removing %s %s/%s\n",
 695                 is_directory ? "directory" : "file",
 696                 parent_dir, final_component ));
 697
 698         /* cd into the parent dir to pin it. */
 699         ret = vfs_ChDir(conn, parent_dir);
 700         if (ret == -1) {
 701                 saved_errno = errno;
 702                 goto out;
 703         }
 704
 705         ZERO_STRUCT(local_fname);
 706         local_fname.base_name = discard_const_p(char, final_component);
 707
 708         /* Must use lstat here. */
 709         ret = SMB_VFS_LSTAT(conn, &local_fname);
 710         if (ret == -1) {
 711                 saved_errno = errno;
 712                 goto out;
 713         }
 714
 715         /* Ensure we have this file open with DELETE access. */
 716         id = vfs_file_id_from_sbuf(conn, &local_fname.st);
 717         for (fsp = file_find_di_first(conn->sconn, id); fsp;
 718                      fsp = file_find_di_next(fsp)) {
 719                 if (fsp->access_mask & DELETE_ACCESS &&
 720                                 fsp->delete_on_close) {
 721                         /* We did open this for delete,
 722                          * allow the delete as root.
 723                          */
 724                         break;
 725                 }
 726         }
 727
 728         if (!fsp) {
 729                 DEBUG(10,("acl_common_remove_object: %s %s/%s "
 730                         "not an open file\n",
 731                         is_directory ? "directory" : "file",
 732                         parent_dir, final_component ));
 733                 saved_errno = EACCES;
 734                 goto out;
 735         }
 736
 737         become_root();
 738         if (is_directory) {
 739                 ret = SMB_VFS_NEXT_RMDIR(handle, final_component);
 740         } else {
 741                 ret = SMB_VFS_NEXT_UNLINK(handle, &local_fname);
 742         }
 743         unbecome_root();
 744
 745         if (ret == -1) {
 746                 saved_errno = errno;
 747         }
 748
 749   out:
 750
 751         TALLOC_FREE(parent_dir);
 752
 753         if (saved_dir) {
 754                 vfs_ChDir(conn, saved_dir);
 755         }
 756         if (saved_errno) {
 757                 errno = saved_errno;
 758         }
 759         return ret;
 760 }
 761
 762 static int rmdir_acl_common(struct vfs_handle_struct *handle,
 763                                 const char *path)
 764 {
 765         int ret;
 766
 767         /* Try the normal rmdir first. */
 768         ret = SMB_VFS_NEXT_RMDIR(handle, path);
 769         if (ret == 0) {
 770                 return 0;
 771         }
 772         if (errno == EACCES || errno == EPERM) {
 773                 /* Failed due to access denied,
 774                    see if we need to root override. */
 775                 return acl_common_remove_object(handle,
 776                                                 path,
 777                                                 true);
 778         }
 779
 780         DEBUG(10,("rmdir_acl_common: unlink of %s failed %s\n",
 781                 path,
 782                 strerror(errno) ));
 783         return -1;
 784 }
 785
 786 static int unlink_acl_common(struct vfs_handle_struct *handle,
 787                         const struct smb_filename *smb_fname)
 788 {
 789         int ret;
 790
 791         /* Try the normal unlink first. */
 792         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 793         if (ret == 0) {
 794                 return 0;
 795         }
 796         if (errno == EACCES || errno == EPERM) {
 797                 /* Failed due to access denied,
 798                    see if we need to root override. */
 799
 800                 /* Don't do anything fancy for streams. */
 801                 if (smb_fname->stream_name) {
 802                         return -1;
 803                 }
 804                 return acl_common_remove_object(handle,
 805                                         smb_fname->base_name,
 806                                         false);
 807         }
 808
 809         DEBUG(10,("unlink_acl_common: unlink of %s failed %s\n",
 810                 smb_fname->base_name,
 811                 strerror(errno) ));
 812         return -1;
 813 }
 814
 815 static int chmod_acl_module_common(struct vfs_handle_struct *handle,
 816                         const char *path, mode_t mode)
 817 {
 818         if (lp_posix_pathnames()) {
 819                 /* Only allow this on POSIX pathnames. */
 820                 return SMB_VFS_NEXT_CHMOD(handle, path, mode);
 821         }
 822         return 0;
 823 }
 824
 825 static int fchmod_acl_module_common(struct vfs_handle_struct *handle,
 826                         struct files_struct *fsp, mode_t mode)
 827 {
 828         if (fsp->posix_open) {
 829                 /* Only allow this on POSIX opens. */
 830                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
 831         }
 832         return 0;
 833 }
 834
 835 static int chmod_acl_acl_module_common(struct vfs_handle_struct *handle,
 836                         const char *name, mode_t mode)
 837 {
 838         if (lp_posix_pathnames()) {
 839                 /* Only allow this on POSIX pathnames. */
 840                 return SMB_VFS_NEXT_CHMOD_ACL(handle, name, mode);
 841         }
 842         return 0;
 843 }
 844
 845 static int fchmod_acl_acl_module_common(struct vfs_handle_struct *handle,
 846                         struct files_struct *fsp, mode_t mode)
 847 {
 848         if (fsp->posix_open) {
 849                 /* Only allow this on POSIX opens. */
 850                 return SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);
 851         }
 852         return 0;
 853 }