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_acl_windows(TALLOC_CTX *ctx,
 511                                          const char *name,
 512                                          SMB_STRUCT_STAT *psbuf,
 513                                          struct security_descriptor **ppdesc)
 514 {
 515         struct dom_sid owner_sid, group_sid;
 516         size_t size = 0;
 517         struct security_ace aces[4];
 518         uint32_t access_mask = 0;
 519         mode_t mode = psbuf->st_ex_mode;
 520         struct security_acl *new_dacl = NULL;
 521         int idx = 0;
 522
 523         DBG_DEBUG("file [%s] mode [0%o]\n", name, (int)mode);
 524
 525         uid_to_sid(&owner_sid, psbuf->st_ex_uid);
 526         gid_to_sid(&group_sid, psbuf->st_ex_gid);
 527
 528         /*
 529          * We provide 2 ACEs:
 530          * - Owner
 531          * - NT System
 532          */
 533
 534         if (mode & S_IRUSR) {
 535                 if (mode & S_IWUSR) {
 536                         access_mask |= SEC_RIGHTS_FILE_ALL;
 537                 } else {
 538                         access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
 539                 }
 540         }
 541         if (mode & S_IWUSR) {
 542                 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
 543         }
 544
 545         init_sec_ace(&aces[idx],
 546                      &owner_sid,
 547                      SEC_ACE_TYPE_ACCESS_ALLOWED,
 548                      access_mask,
 549                      0);
 550         idx++;
 551
 552         init_sec_ace(&aces[idx],
 553                      &global_sid_System,
 554                      SEC_ACE_TYPE_ACCESS_ALLOWED,
 555                      SEC_RIGHTS_FILE_ALL,
 556                      0);
 557         idx++;
 558
 559         new_dacl = make_sec_acl(ctx,
 560                                 NT4_ACL_REVISION,
 561                                 idx,
 562                                 aces);
 563
 564         if (!new_dacl) {
 565                 return NT_STATUS_NO_MEMORY;
 566         }
 567
 568         *ppdesc = make_sec_desc(ctx,
 569                                 SECURITY_DESCRIPTOR_REVISION_1,
 570                                 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
 571                                 &owner_sid,
 572                                 &group_sid,
 573                                 NULL,
 574                                 new_dacl,
 575                                 &size);
 576         if (!*ppdesc) {
 577                 return NT_STATUS_NO_MEMORY;
 578         }
 579         return NT_STATUS_OK;
 580 }
 581
 582 static NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
 583                                             struct acl_common_config *config,
 584                                             const char *name,
 585                                             SMB_STRUCT_STAT *psbuf,
 586                                             struct security_descriptor **ppdesc)
 587 {
 588         NTSTATUS status;
 589
 590         switch (config->default_acl_style) {
 591
 592         case DEFAULT_ACL_POSIX:
 593                 status =  make_default_acl_posix(ctx, name, psbuf, ppdesc);
 594                 break;
 595
 596         case DEFAULT_ACL_WINDOWS:
 597                 status =  make_default_acl_windows(ctx, name, psbuf, ppdesc);
 598                 break;
 599
 600         default:
 601                 DBG_ERR("unknown acl style %d", config->default_acl_style);
 602                 status = NT_STATUS_INTERNAL_ERROR;
 603                 break;
 604         }
 605
 606         return status;
 607 }
 608
 609 /**
 610  * Validate an ACL blob
 611  *
 612  * This validates an ACL blob against the underlying filesystem ACL. If this
 613  * function returns NT_STATUS_OK ppsd can be
 614  *
 615  * 1. the ACL from the blob (psd_from_fs=false), or
 616  * 2. the ACL from the fs (psd_from_fs=true), or
 617  * 3. NULL (!)
 618  *
 619  * If the return value is anything else then NT_STATUS_OK, ppsd is set to NULL
 620  * and psd_from_fs set to false.
 621  *
 622  * Returning the underlying filesystem ACL in case no. 2 is really just an
 623  * optimisation, because some validations have to fetch the filesytem ACL as
 624  * part of the validation, so we already have it available and callers might
 625  * need it as well.
 626  **/
 627 static NTSTATUS validate_nt_acl_blob(TALLOC_CTX *mem_ctx,
 628                                      vfs_handle_struct *handle,
 629                                      files_struct *fsp,
 630                                      const struct smb_filename *smb_fname,
 631                                      const DATA_BLOB *blob,
 632                                      struct security_descriptor **ppsd,
 633                                      bool *psd_is_from_fs)
 634 {
 635         NTSTATUS status;
 636         uint16_t hash_type = XATTR_SD_HASH_TYPE_NONE;
 637         uint16_t xattr_version = 0;
 638         uint8_t hash[XATTR_SD_HASH_SIZE];
 639         uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE];
 640         uint8_t hash_tmp[XATTR_SD_HASH_SIZE];
 641         uint8_t sys_acl_hash_tmp[XATTR_SD_HASH_SIZE];
 642         struct security_descriptor *psd = NULL;
 643         struct security_descriptor *psd_blob = NULL;
 644         struct security_descriptor *psd_fs = NULL;
 645         char *sys_acl_blob_description = NULL;
 646         DATA_BLOB sys_acl_blob = { 0 };
 647         struct acl_common_config *config = NULL;
 648
 649         *ppsd = NULL;
 650         *psd_is_from_fs = false;
 651
 652         SMB_VFS_HANDLE_GET_DATA(handle, config,
 653                                 struct acl_common_config,
 654                                 return NT_STATUS_UNSUCCESSFUL);
 655
 656         status = parse_acl_blob(blob,
 657                                 mem_ctx,
 658                                 &psd_blob,
 659                                 &hash_type,
 660                                 &xattr_version,
 661                                 &hash[0],
 662                                 &sys_acl_hash[0]);
 663         if (!NT_STATUS_IS_OK(status)) {
 664                 DBG_DEBUG("parse_acl_blob returned %s\n", nt_errstr(status));
 665                 goto fail;
 666         }
 667
 668         /* determine which type of xattr we got */
 669         switch (xattr_version) {
 670         case 1:
 671         case 2:
 672                 /* These xattr types are unilatteral, they do not
 673                  * require confirmation of the hash.  In particular,
 674                  * the NTVFS file server uses version 1, but
 675                  * 'samba-tool ntacl' can set these as well */
 676                 *ppsd = psd_blob;
 677                 return NT_STATUS_OK;
 678         case 3:
 679         case 4:
 680                 if (config->ignore_system_acls) {
 681                         *ppsd = psd_blob;
 682                         return NT_STATUS_OK;
 683                 }
 684
 685                 break;
 686         default:
 687                 DBG_DEBUG("ACL blob revision mismatch (%u) for file %s\n",
 688                           (unsigned int)hash_type, smb_fname->base_name);
 689                 TALLOC_FREE(psd_blob);
 690                 return NT_STATUS_OK;
 691         }
 692
 693         /* determine which type of xattr we got */
 694         if (hash_type != XATTR_SD_HASH_TYPE_SHA256) {
 695                 DBG_DEBUG("ACL blob hash type (%u) unexpected for file %s\n",
 696                           (unsigned int)hash_type, smb_fname->base_name);
 697                 TALLOC_FREE(psd_blob);
 698                 return NT_STATUS_OK;
 699         }
 700
 701         /* determine which type of xattr we got */
 702         switch (xattr_version) {
 703         case 4:
 704         {
 705                 int ret;
 706                 if (fsp) {
 707                         /* Get the full underlying sd, then hash. */
 708                         ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle,
 709                                                                fsp,
 710                                                                mem_ctx,
 711                                                                &sys_acl_blob_description,
 712                                                                &sys_acl_blob);
 713                 } else {
 714                         /* Get the full underlying sd, then hash. */
 715                         ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FILE(handle,
 716                                                  smb_fname->base_name,
 717                                                  mem_ctx,
 718                                                  &sys_acl_blob_description,
 719                                                  &sys_acl_blob);
 720                 }
 721
 722                 /* If we fail to get the ACL blob (for some reason) then this
 723                  * is not fatal, we just work based on the NT ACL only */
 724                 if (ret == 0) {
 725                         status = hash_blob_sha256(sys_acl_blob, sys_acl_hash_tmp);
 726                         if (!NT_STATUS_IS_OK(status)) {
 727                                 goto fail;
 728                         }
 729
 730                         TALLOC_FREE(sys_acl_blob_description);
 731                         TALLOC_FREE(sys_acl_blob.data);
 732
 733                         if (memcmp(&sys_acl_hash[0], &sys_acl_hash_tmp[0],
 734                                    XATTR_SD_HASH_SIZE) == 0) {
 735                                 /* Hash matches, return blob sd. */
 736                                 DBG_DEBUG("blob hash matches for file %s\n",
 737                                           smb_fname->base_name);
 738                                 *ppsd = psd_blob;
 739                                 return NT_STATUS_OK;
 740                         }
 741                 }
 742
 743                 /* Otherwise, fall though and see if the NT ACL hash matches */
 744         }
 745         case 3:
 746                 /* Get the full underlying sd for the hash
 747                    or to return as backup. */
 748                 if (fsp) {
 749                         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 750                                                           fsp,
 751                                                           HASH_SECURITY_INFO,
 752                                                           mem_ctx,
 753                                                           &psd_fs);
 754                 } else {
 755                         status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 756                                                          smb_fname,
 757                                                          HASH_SECURITY_INFO,
 758                                                          mem_ctx,
 759                                                          &psd_fs);
 760                 }
 761
 762                 if (!NT_STATUS_IS_OK(status)) {
 763                         DBG_DEBUG("get_next_acl for file %s returned %s\n",
 764                                   smb_fname->base_name, nt_errstr(status));
 765                         goto fail;
 766                 }
 767
 768                 status = hash_sd_sha256(psd_fs, hash_tmp);
 769                 if (!NT_STATUS_IS_OK(status)) {
 770                         TALLOC_FREE(psd_blob);
 771                         *ppsd = psd_fs;
 772                         *psd_is_from_fs = true;
 773                         return NT_STATUS_OK;
 774                 }
 775
 776                 if (memcmp(&hash[0], &hash_tmp[0], XATTR_SD_HASH_SIZE) == 0) {
 777                         /* Hash matches, return blob sd. */
 778                         DBG_DEBUG("blob hash matches for file %s\n",
 779                                   smb_fname->base_name);
 780                         *ppsd = psd_blob;
 781                         return NT_STATUS_OK;
 782                 }
 783
 784                 /* Hash doesn't match, return underlying sd. */
 785                 DBG_DEBUG("blob hash does not match for file %s - returning "
 786                           "file system SD mapping.\n",
 787                           smb_fname->base_name);
 788
 789                 if (DEBUGLEVEL >= 10) {
 790                         DBG_DEBUG("acl for blob hash for %s is:\n",
 791                                   smb_fname->base_name);
 792                         NDR_PRINT_DEBUG(security_descriptor, psd_fs);
 793                 }
 794
 795                 TALLOC_FREE(psd_blob);
 796                 *ppsd = psd_fs;
 797                 *psd_is_from_fs = true;
 798         }
 799
 800         return NT_STATUS_OK;
 801
 802 fail:
 803         TALLOC_FREE(psd);
 804         TALLOC_FREE(psd_blob);
 805         TALLOC_FREE(psd_fs);
 806         TALLOC_FREE(sys_acl_blob_description);
 807         TALLOC_FREE(sys_acl_blob.data);
 808         return status;
 809 }
 810
 811 static NTSTATUS stat_fsp_or_smb_fname(vfs_handle_struct *handle,
 812                                       files_struct *fsp,
 813                                       const struct smb_filename *smb_fname,
 814                                       SMB_STRUCT_STAT *sbuf,
 815                                       SMB_STRUCT_STAT **psbuf)
 816 {
 817         NTSTATUS status;
 818         int ret;
 819
 820         if (fsp) {
 821                 status = vfs_stat_fsp(fsp);
 822                 if (!NT_STATUS_IS_OK(status)) {
 823                         return status;
 824                 }
 825                 *psbuf = &fsp->fsp_name->st;
 826         } else {
 827                 /*
 828                  * https://bugzilla.samba.org/show_bug.cgi?id=11249
 829                  *
 830                  * We are currently guaranteed that 'name' here is a
 831                  * smb_fname->base_name, which *cannot* contain a stream name
 832                  * (':'). vfs_stat_smb_fname() splits a name into a base name +
 833                  * stream name, which when we get here we know we've already
 834                  * done.  So we have to call the stat or lstat VFS calls
 835                  * directly here. Else, a base_name that contains a ':' (from a
 836                  * demangled name) will get split again.
 837                  *
 838                  * FIXME.
 839                  * This uglyness will go away once smb_fname is fully plumbed
 840                  * through the VFS.
 841                  */
 842                 ret = vfs_stat_smb_basename(handle->conn,
 843                                             smb_fname,
 844                                             sbuf);
 845                 if (ret == -1) {
 846                         return map_nt_error_from_unix(errno);
 847                 }
 848         }
 849
 850         return NT_STATUS_OK;
 851 }
 852
 853 /*******************************************************************
 854  Pull a DATA_BLOB from an xattr given a pathname.
 855  If the hash doesn't match, or doesn't exist - return the underlying
 856  filesystem sd.
 857 *******************************************************************/
 858
 859 static NTSTATUS get_nt_acl_internal(vfs_handle_struct *handle,
 860                                     files_struct *fsp,
 861                                     const struct smb_filename *smb_fname_in,
 862                                     uint32_t security_info,
 863                                     TALLOC_CTX *mem_ctx,
 864                                     struct security_descriptor **ppdesc)
 865 {
 866         DATA_BLOB blob = data_blob_null;
 867         NTSTATUS status;
 868         struct security_descriptor *psd = NULL;
 869         const struct smb_filename *smb_fname = NULL;
 870         bool psd_is_from_fs = false;
 871         struct acl_common_config *config = NULL;
 872
 873         SMB_VFS_HANDLE_GET_DATA(handle, config,
 874                                 struct acl_common_config,
 875                                 return NT_STATUS_UNSUCCESSFUL);
 876
 877         if (fsp && smb_fname_in == NULL) {
 878                 smb_fname = fsp->fsp_name;
 879         } else {
 880                 smb_fname = smb_fname_in;
 881         }
 882
 883         DEBUG(10, ("get_nt_acl_internal: name=%s\n", smb_fname->base_name));
 884
 885         status = get_acl_blob(mem_ctx, handle, fsp, smb_fname, &blob);
 886         if (NT_STATUS_IS_OK(status)) {
 887                 status = validate_nt_acl_blob(mem_ctx,
 888                                               handle,
 889                                               fsp,
 890                                               smb_fname,
 891                                               &blob,
 892                                               &psd,
 893                                               &psd_is_from_fs);
 894                 TALLOC_FREE(blob.data);
 895                 if (!NT_STATUS_IS_OK(status)) {
 896                         DBG_DEBUG("ACL validation for [%s] failed\n",
 897                                   smb_fname->base_name);
 898                         goto fail;
 899                 }
 900         }
 901
 902         if (psd == NULL) {
 903                 /* Get the full underlying sd, as we failed to get the
 904                  * blob for the hash, or the revision/hash type wasn't
 905                  * known */
 906
 907                 if (config->ignore_system_acls) {
 908                         SMB_STRUCT_STAT sbuf;
 909                         SMB_STRUCT_STAT *psbuf = &sbuf;
 910
 911                         status = stat_fsp_or_smb_fname(handle, fsp, smb_fname,
 912                                                        &sbuf, &psbuf);
 913                         if (!NT_STATUS_IS_OK(status)) {
 914                                 goto fail;
 915                         }
 916
 917                         status = make_default_filesystem_acl(
 918                                 mem_ctx,
 919                                 config,
 920                                 smb_fname->base_name,
 921                                 psbuf,
 922                                 &psd);
 923                         if (!NT_STATUS_IS_OK(status)) {
 924                                 goto fail;
 925                         }
 926                 } else {
 927                         if (fsp) {
 928                                 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 929                                                                   fsp,
 930                                                                   security_info,
 931                                                                   mem_ctx,
 932                                                                   &psd);
 933                         } else {
 934                                 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 935                                                                  smb_fname,
 936                                                                  security_info,
 937                                                                  mem_ctx,
 938                                                                  &psd);
 939                         }
 940
 941                         if (!NT_STATUS_IS_OK(status)) {
 942                                 DBG_DEBUG("get_next_acl for file %s "
 943                                           "returned %s\n",
 944                                           smb_fname->base_name,
 945                                           nt_errstr(status));
 946                                 goto fail;
 947                         }
 948
 949                         psd_is_from_fs = true;
 950                 }
 951         }
 952
 953         if (psd_is_from_fs) {
 954                 SMB_STRUCT_STAT sbuf;
 955                 SMB_STRUCT_STAT *psbuf = &sbuf;
 956                 bool is_directory = false;
 957
 958                 /*
 959                  * We're returning the underlying ACL from the
 960                  * filesystem. If it's a directory, and has no
 961                  * inheritable ACE entries we have to fake them.
 962                  */
 963
 964                 status = stat_fsp_or_smb_fname(handle, fsp, smb_fname,
 965                                                &sbuf, &psbuf);
 966                 if (!NT_STATUS_IS_OK(status)) {
 967                         goto fail;
 968                 }
 969
 970                 is_directory = S_ISDIR(psbuf->st_ex_mode);
 971
 972                 if (is_directory && !sd_has_inheritable_components(psd, true)) {
 973                         status = add_directory_inheritable_components(
 974                                 handle,
 975                                 smb_fname->base_name,
 976                                 psbuf,
 977                                 psd);
 978                         if (!NT_STATUS_IS_OK(status)) {
 979                                 goto fail;
 980                         }
 981                 }
 982
 983                 /*
 984                  * The underlying POSIX module always sets the
 985                  * ~SEC_DESC_DACL_PROTECTED bit, as ACLs can't be inherited in
 986                  * this way under POSIX. Remove it for Windows-style ACLs.
 987                  */
 988                 psd->type &= ~SEC_DESC_DACL_PROTECTED;
 989         }
 990
 991         if (!(security_info & SECINFO_OWNER)) {
 992                 psd->owner_sid = NULL;
 993         }
 994         if (!(security_info & SECINFO_GROUP)) {
 995                 psd->group_sid = NULL;
 996         }
 997         if (!(security_info & SECINFO_DACL)) {
 998                 psd->type &= ~SEC_DESC_DACL_PRESENT;
 999                 psd->dacl = NULL;
1000         }
1001         if (!(security_info & SECINFO_SACL)) {
1002                 psd->type &= ~SEC_DESC_SACL_PRESENT;
1003                 psd->sacl = NULL;
1004         }
1005
1006         if (DEBUGLEVEL >= 10) {
1007                 DEBUG(10,("get_nt_acl_internal: returning acl for %s is:\n",
1008                         smb_fname->base_name ));
1009                 NDR_PRINT_DEBUG(security_descriptor, psd);
1010         }
1011
1012         *ppdesc = psd;
1013
1014         return NT_STATUS_OK;
1015
1016 fail:
1017         TALLOC_FREE(psd);
1018         return status;
1019 }
1020
1021 /*********************************************************************
1022  Fetch a security descriptor given an fsp.
1023 *********************************************************************/
1024
1025 static NTSTATUS fget_nt_acl_common(vfs_handle_struct *handle,
1026                                    files_struct *fsp,
1027                                    uint32_t security_info,
1028                                    TALLOC_CTX *mem_ctx,
1029                                    struct security_descriptor **ppdesc)
1030 {
1031         return get_nt_acl_internal(handle, fsp,
1032                                    NULL, security_info, mem_ctx, ppdesc);
1033 }
1034
1035 /*********************************************************************
1036  Fetch a security descriptor given a pathname.
1037 *********************************************************************/
1038
1039 static NTSTATUS get_nt_acl_common(vfs_handle_struct *handle,
1040                                   const struct smb_filename *smb_fname,
1041                                   uint32_t security_info,
1042                                   TALLOC_CTX *mem_ctx,
1043                                   struct security_descriptor **ppdesc)
1044 {
1045         return get_nt_acl_internal(handle,
1046                                 NULL,
1047                                 smb_fname,
1048                                 security_info,
1049                                 mem_ctx,
1050                                 ppdesc);
1051 }
1052
1053 /*********************************************************************
1054  Set the underlying ACL (e.g. POSIX ACLS, POSIX owner, etc)
1055 *********************************************************************/
1056 static NTSTATUS set_underlying_acl(vfs_handle_struct *handle, files_struct *fsp,
1057                                    struct security_descriptor *psd,
1058                                    uint32_t security_info_sent,
1059                                    bool chown_needed)
1060 {
1061         NTSTATUS status =
1062             SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
1063         if (!NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
1064                 return status;
1065         }
1066
1067         /* We got access denied here. If we're already root,
1068            or we didn't need to do a chown, or the fsp isn't
1069            open with WRITE_OWNER access, just return. */
1070         if (get_current_uid(handle->conn) == 0 || chown_needed == false ||
1071             !(fsp->access_mask & SEC_STD_WRITE_OWNER)) {
1072                 return NT_STATUS_ACCESS_DENIED;
1073         }
1074
1075         DEBUG(10, ("fset_nt_acl_common: overriding chown on file %s "
1076                    "for sid %s\n",
1077                    fsp_str_dbg(fsp), sid_string_tos(psd->owner_sid)));
1078
1079         /* Ok, we failed to chown and we have
1080            SEC_STD_WRITE_OWNER access - override. */
1081         become_root();
1082         status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
1083         unbecome_root();
1084
1085         return status;
1086 }
1087
1088 /*********************************************************************
1089  Store a v3 security descriptor
1090 *********************************************************************/
1091 static NTSTATUS store_v3_blob(vfs_handle_struct *handle, files_struct *fsp,
1092                               struct security_descriptor *psd,
1093                               struct security_descriptor *pdesc_next,
1094                               uint8_t hash[XATTR_SD_HASH_SIZE])
1095 {
1096         NTSTATUS status;
1097         DATA_BLOB blob;
1098
1099         if (DEBUGLEVEL >= 10) {
1100                 DEBUG(10, ("fset_nt_acl_xattr: storing xattr sd for file %s\n",
1101                            fsp_str_dbg(fsp)));
1102                 NDR_PRINT_DEBUG(
1103                     security_descriptor,
1104                     discard_const_p(struct security_descriptor, psd));
1105
1106                 if (pdesc_next != NULL) {
1107                         DEBUG(10, ("fset_nt_acl_xattr: storing has in xattr sd "
1108                                    "based on \n"));
1109                         NDR_PRINT_DEBUG(
1110                             security_descriptor,
1111                             discard_const_p(struct security_descriptor,
1112                                             pdesc_next));
1113                 } else {
1114                         DEBUG(10,
1115                               ("fset_nt_acl_xattr: ignoring underlying sd\n"));
1116                 }
1117         }
1118         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
1119         if (!NT_STATUS_IS_OK(status)) {
1120                 DEBUG(10, ("fset_nt_acl_xattr: create_acl_blob failed\n"));
1121                 return status;
1122         }
1123
1124         status = store_acl_blob_fsp(handle, fsp, &blob);
1125         return status;
1126 }
1127
1128 /*********************************************************************
1129  Store a security descriptor given an fsp.
1130 *********************************************************************/
1131
1132 static NTSTATUS fset_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
1133         uint32_t security_info_sent, const struct security_descriptor *orig_psd)
1134 {
1135         NTSTATUS status;
1136         int ret;
1137         DATA_BLOB blob, sys_acl_blob;
1138         struct security_descriptor *pdesc_next = NULL;
1139         struct security_descriptor *psd = NULL;
1140         uint8_t hash[XATTR_SD_HASH_SIZE];
1141         uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE];
1142         bool chown_needed = false;
1143         char *sys_acl_description;
1144         TALLOC_CTX *frame = talloc_stackframe();
1145         bool ignore_file_system_acl = lp_parm_bool(
1146             SNUM(handle->conn), ACL_MODULE_NAME, "ignore system acls", false);
1147
1148         if (DEBUGLEVEL >= 10) {
1149                 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
1150                           fsp_str_dbg(fsp)));
1151                 NDR_PRINT_DEBUG(security_descriptor,
1152                         discard_const_p(struct security_descriptor, orig_psd));
1153         }
1154
1155         status = get_nt_acl_internal(handle, fsp,
1156                         NULL,
1157                         SECINFO_OWNER|SECINFO_GROUP|SECINFO_DACL|SECINFO_SACL,
1158                                      frame,
1159                         &psd);
1160
1161         if (!NT_STATUS_IS_OK(status)) {
1162                 TALLOC_FREE(frame);
1163                 return status;
1164         }
1165
1166         psd->revision = orig_psd->revision;
1167         /* All our SD's are self relative. */
1168         psd->type = orig_psd->type | SEC_DESC_SELF_RELATIVE;
1169
1170         if ((security_info_sent & SECINFO_OWNER) && (orig_psd->owner_sid != NULL)) {
1171                 if (!dom_sid_equal(orig_psd->owner_sid, psd->owner_sid)) {
1172                         /* We're changing the owner. */
1173                         chown_needed = true;
1174                 }
1175                 psd->owner_sid = orig_psd->owner_sid;
1176         }
1177         if ((security_info_sent & SECINFO_GROUP) && (orig_psd->group_sid != NULL)) {
1178                 if (!dom_sid_equal(orig_psd->group_sid, psd->group_sid)) {
1179                         /* We're changing the group. */
1180                         chown_needed = true;
1181                 }
1182                 psd->group_sid = orig_psd->group_sid;
1183         }
1184         if (security_info_sent & SECINFO_DACL) {
1185                 if (security_descriptor_with_ms_nfs(orig_psd)) {
1186                         /*
1187                          * If the sd contains a MS NFS SID, do
1188                          * nothing, it's a chmod() request from OS X
1189                          * with AAPL context.
1190                          */
1191                         TALLOC_FREE(frame);
1192                         return NT_STATUS_OK;
1193                 }
1194                 psd->dacl = orig_psd->dacl;
1195                 psd->type |= SEC_DESC_DACL_PRESENT;
1196         }
1197         if (security_info_sent & SECINFO_SACL) {
1198                 psd->sacl = orig_psd->sacl;
1199                 psd->type |= SEC_DESC_SACL_PRESENT;
1200         }
1201
1202         if (ignore_file_system_acl) {
1203                 if (chown_needed) {
1204                         /* send only ownership stuff to lower layer */
1205                         security_info_sent &= (SECINFO_OWNER | SECINFO_GROUP);
1206                         status = set_underlying_acl(handle, fsp, psd,
1207                                                     security_info_sent, true);
1208                         if (!NT_STATUS_IS_OK(status)) {
1209                                 TALLOC_FREE(frame);
1210                                 return status;
1211                         }
1212                 }
1213                 ZERO_ARRAY(hash);
1214                 status = store_v3_blob(handle, fsp, psd, NULL, hash);
1215
1216                 TALLOC_FREE(frame);
1217                 return status;
1218         }
1219
1220         status = set_underlying_acl(handle, fsp, psd, security_info_sent,
1221                                     chown_needed);
1222         if (!NT_STATUS_IS_OK(status)) {
1223                 TALLOC_FREE(frame);
1224                 return status;
1225         }
1226
1227         /* Get the full underlying sd, then hash. */
1228         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
1229                                           fsp,
1230                                           HASH_SECURITY_INFO,
1231                                           frame,
1232                                           &pdesc_next);
1233
1234         if (!NT_STATUS_IS_OK(status)) {
1235                 TALLOC_FREE(frame);
1236                 return status;
1237         }
1238
1239         status = hash_sd_sha256(pdesc_next, hash);
1240         if (!NT_STATUS_IS_OK(status)) {
1241                 TALLOC_FREE(frame);
1242                 return status;
1243         }
1244
1245         /* Get the full underlying sd, then hash. */
1246         ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle,
1247                                                fsp,
1248                                                frame,
1249                                                &sys_acl_description,
1250                                                &sys_acl_blob);
1251
1252         /* If we fail to get the ACL blob (for some reason) then this
1253          * is not fatal, we just work based on the NT ACL only */
1254         if (ret != 0) {
1255                 status = store_v3_blob(handle, fsp, psd, pdesc_next, hash);
1256
1257                 TALLOC_FREE(frame);
1258                 return status;
1259         }
1260
1261         status = hash_blob_sha256(sys_acl_blob, sys_acl_hash);
1262         if (!NT_STATUS_IS_OK(status)) {
1263                 TALLOC_FREE(frame);
1264                 return status;
1265         }
1266
1267         if (DEBUGLEVEL >= 10) {
1268                 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s based on system ACL\n",
1269                           fsp_str_dbg(fsp)));
1270                 NDR_PRINT_DEBUG(security_descriptor,
1271                                 discard_const_p(struct security_descriptor, psd));
1272
1273                 DEBUG(10,("fset_nt_acl_xattr: storing hash in xattr sd based on system ACL and:\n"));
1274                 NDR_PRINT_DEBUG(security_descriptor,
1275                                 discard_const_p(struct security_descriptor, pdesc_next));
1276         }
1277
1278         /* We store hashes of both the sys ACL blob and the NT
1279          * security desciptor mapped from that ACL so as to improve
1280          * our chances against some inadvertant change breaking the
1281          * hash used */
1282         status = create_sys_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash,
1283                                      sys_acl_description, sys_acl_hash);
1284         if (!NT_STATUS_IS_OK(status)) {
1285                 DEBUG(10, ("fset_nt_acl_xattr: create_sys_acl_blob failed\n"));
1286                 TALLOC_FREE(frame);
1287                 return status;
1288         }
1289
1290         status = store_acl_blob_fsp(handle, fsp, &blob);
1291
1292         TALLOC_FREE(frame);
1293         return status;
1294 }
1295
1296 static int acl_common_remove_object(vfs_handle_struct *handle,
1297                                         const char *path,
1298                                         bool is_directory)
1299 {
1300         connection_struct *conn = handle->conn;
1301         struct file_id id;
1302         files_struct *fsp = NULL;
1303         int ret = 0;
1304         char *parent_dir = NULL;
1305         const char *final_component = NULL;
1306         struct smb_filename local_fname;
1307         int saved_errno = 0;
1308         char *saved_dir = NULL;
1309
1310         saved_dir = vfs_GetWd(talloc_tos(),conn);
1311         if (!saved_dir) {
1312                 saved_errno = errno;
1313                 goto out;
1314         }
1315
1316         if (!parent_dirname(talloc_tos(), path,
1317                         &parent_dir, &final_component)) {
1318                 saved_errno = ENOMEM;
1319                 goto out;
1320         }
1321
1322         DEBUG(10,("acl_common_remove_object: removing %s %s/%s\n",
1323                 is_directory ? "directory" : "file",
1324                 parent_dir, final_component ));
1325
1326         /* cd into the parent dir to pin it. */
1327         ret = vfs_ChDir(conn, parent_dir);
1328         if (ret == -1) {
1329                 saved_errno = errno;
1330                 goto out;
1331         }
1332
1333         ZERO_STRUCT(local_fname);
1334         local_fname.base_name = discard_const_p(char, final_component);
1335
1336         /* Must use lstat here. */
1337         ret = SMB_VFS_LSTAT(conn, &local_fname);
1338         if (ret == -1) {
1339                 saved_errno = errno;
1340                 goto out;
1341         }
1342
1343         /* Ensure we have this file open with DELETE access. */
1344         id = vfs_file_id_from_sbuf(conn, &local_fname.st);
1345         for (fsp = file_find_di_first(conn->sconn, id); fsp;
1346                      fsp = file_find_di_next(fsp)) {
1347                 if (fsp->access_mask & DELETE_ACCESS &&
1348                                 fsp->delete_on_close) {
1349                         /* We did open this for delete,
1350                          * allow the delete as root.
1351                          */
1352                         break;
1353                 }
1354         }
1355
1356         if (!fsp) {
1357                 DEBUG(10,("acl_common_remove_object: %s %s/%s "
1358                         "not an open file\n",
1359                         is_directory ? "directory" : "file",
1360                         parent_dir, final_component ));
1361                 saved_errno = EACCES;
1362                 goto out;
1363         }
1364
1365         become_root();
1366         if (is_directory) {
1367                 ret = SMB_VFS_NEXT_RMDIR(handle, &local_fname);
1368         } else {
1369                 ret = SMB_VFS_NEXT_UNLINK(handle, &local_fname);
1370         }
1371         unbecome_root();
1372
1373         if (ret == -1) {
1374                 saved_errno = errno;
1375         }
1376
1377   out:
1378
1379         TALLOC_FREE(parent_dir);
1380
1381         if (saved_dir) {
1382                 vfs_ChDir(conn, saved_dir);
1383         }
1384         if (saved_errno) {
1385                 errno = saved_errno;
1386         }
1387         return ret;
1388 }
1389
1390 static int rmdir_acl_common(struct vfs_handle_struct *handle,
1391                                 const struct smb_filename *smb_fname)
1392 {
1393         int ret;
1394
1395         /* Try the normal rmdir first. */
1396         ret = SMB_VFS_NEXT_RMDIR(handle, smb_fname);
1397         if (ret == 0) {
1398                 return 0;
1399         }
1400         if (errno == EACCES || errno == EPERM) {
1401                 /* Failed due to access denied,
1402                    see if we need to root override. */
1403                 return acl_common_remove_object(handle,
1404                                                 smb_fname->base_name,
1405                                                 true);
1406         }
1407
1408         DEBUG(10,("rmdir_acl_common: unlink of %s failed %s\n",
1409                 smb_fname->base_name,
1410                 strerror(errno) ));
1411         return -1;
1412 }
1413
1414 static int unlink_acl_common(struct vfs_handle_struct *handle,
1415                         const struct smb_filename *smb_fname)
1416 {
1417         int ret;
1418
1419         /* Try the normal unlink first. */
1420         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
1421         if (ret == 0) {
1422                 return 0;
1423         }
1424         if (errno == EACCES || errno == EPERM) {
1425                 /* Failed due to access denied,
1426                    see if we need to root override. */
1427
1428                 /* Don't do anything fancy for streams. */
1429                 if (smb_fname->stream_name) {
1430                         return -1;
1431                 }
1432                 return acl_common_remove_object(handle,
1433                                         smb_fname->base_name,
1434                                         false);
1435         }
1436
1437         DEBUG(10,("unlink_acl_common: unlink of %s failed %s\n",
1438                 smb_fname->base_name,
1439                 strerror(errno) ));
1440         return -1;
1441 }
1442
1443 static int chmod_acl_module_common(struct vfs_handle_struct *handle,
1444                         const struct smb_filename *smb_fname,
1445                         mode_t mode)
1446 {
1447         if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) {
1448                 /* Only allow this on POSIX pathnames. */
1449                 return SMB_VFS_NEXT_CHMOD(handle, smb_fname, mode);
1450         }
1451         return 0;
1452 }
1453
1454 static int fchmod_acl_module_common(struct vfs_handle_struct *handle,
1455                         struct files_struct *fsp, mode_t mode)
1456 {
1457         if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
1458                 /* Only allow this on POSIX opens. */
1459                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1460         }
1461         return 0;
1462 }
1463
1464 static int chmod_acl_acl_module_common(struct vfs_handle_struct *handle,
1465                         const struct smb_filename *smb_fname,
1466                         mode_t mode)
1467 {
1468         if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) {
1469                 /* Only allow this on POSIX pathnames. */
1470                 return SMB_VFS_NEXT_CHMOD_ACL(handle, smb_fname, mode);
1471         }
1472         return 0;
1473 }
1474
1475 static int fchmod_acl_acl_module_common(struct vfs_handle_struct *handle,
1476                         struct files_struct *fsp, mode_t mode)
1477 {
1478         if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
1479                 /* Only allow this on POSIX opens. */
1480                 return SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);
1481         }
1482         return 0;
1483 }