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
  27 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
  28                         DATA_BLOB *pblob,
  29                         uint16_t hash_type,
  30                         uint8_t hash[XATTR_SD_HASH_SIZE]);
  31
  32 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
  33                         vfs_handle_struct *handle,
  34                         files_struct *fsp,
  35                         const char *name,
  36                         DATA_BLOB *pblob);
  37
  38 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
  39                         files_struct *fsp,
  40                         DATA_BLOB *pblob);
  41
  42 #define HASH_SECURITY_INFO (SECINFO_OWNER | \
  43                                 SECINFO_GROUP | \
  44                                 SECINFO_DACL | \
  45                                 SECINFO_SACL)
  46
  47 /*******************************************************************
  48  Hash a security descriptor.
  49 *******************************************************************/
  50
  51 static NTSTATUS hash_sd_sha256(struct security_descriptor *psd,
  52                         uint8_t *hash)
  53 {
  54         DATA_BLOB blob;
  55         SHA256_CTX tctx;
  56         NTSTATUS status;
  57
  58         memset(hash, '\0', XATTR_SD_HASH_SIZE);
  59         status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
  60         if (!NT_STATUS_IS_OK(status)) {
  61                 return status;
  62         }
  63
  64         SHA256_Init(&tctx);
  65         SHA256_Update(&tctx, blob.data, blob.length);
  66         SHA256_Final(hash, &tctx);
  67
  68         return NT_STATUS_OK;
  69 }
  70
  71 /*******************************************************************
  72  Parse out a struct security_descriptor from a DATA_BLOB.
  73 *******************************************************************/
  74
  75 static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
  76                                 struct security_descriptor **ppdesc,
  77                                 uint16_t *p_hash_type,
  78                                 uint8_t hash[XATTR_SD_HASH_SIZE])
  79 {
  80         TALLOC_CTX *ctx = talloc_tos();
  81         struct xattr_NTACL xacl;
  82         enum ndr_err_code ndr_err;
  83         size_t sd_size;
  84
  85         ndr_err = ndr_pull_struct_blob(pblob, ctx, &xacl,
  86                         (ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
  87
  88         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  89                 DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
  90                         ndr_errstr(ndr_err)));
  91                 return ndr_map_error2ntstatus(ndr_err);
  92         }
  93
  94         switch (xacl.version) {
  95                 case 2:
  96                         *ppdesc = make_sec_desc(ctx, SD_REVISION,
  97                                         xacl.info.sd_hs2->sd->type | SEC_DESC_SELF_RELATIVE,
  98                                         xacl.info.sd_hs2->sd->owner_sid,
  99                                         xacl.info.sd_hs2->sd->group_sid,
 100                                         xacl.info.sd_hs2->sd->sacl,
 101                                         xacl.info.sd_hs2->sd->dacl,
 102                                         &sd_size);
 103                         /* No hash - null out. */
 104                         *p_hash_type = XATTR_SD_HASH_TYPE_NONE;
 105                         memset(hash, '\0', XATTR_SD_HASH_SIZE);
 106                         break;
 107                 case 3:
 108                         *ppdesc = make_sec_desc(ctx, SD_REVISION,
 109                                         xacl.info.sd_hs3->sd->type | SEC_DESC_SELF_RELATIVE,
 110                                         xacl.info.sd_hs3->sd->owner_sid,
 111                                         xacl.info.sd_hs3->sd->group_sid,
 112                                         xacl.info.sd_hs3->sd->sacl,
 113                                         xacl.info.sd_hs3->sd->dacl,
 114                                         &sd_size);
 115                         *p_hash_type = xacl.info.sd_hs3->hash_type;
 116                         /* Current version 3. */
 117                         memcpy(hash, xacl.info.sd_hs3->hash, XATTR_SD_HASH_SIZE);
 118                         break;
 119                 default:
 120                         return NT_STATUS_REVISION_MISMATCH;
 121         }
 122
 123         TALLOC_FREE(xacl.info.sd);
 124
 125         return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
 126 }
 127
 128 /*******************************************************************
 129  Create a DATA_BLOB from a security descriptor.
 130 *******************************************************************/
 131
 132 static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
 133                         DATA_BLOB *pblob,
 134                         uint16_t hash_type,
 135                         uint8_t hash[XATTR_SD_HASH_SIZE])
 136 {
 137         struct xattr_NTACL xacl;
 138         struct security_descriptor_hash_v3 sd_hs3;
 139         enum ndr_err_code ndr_err;
 140         TALLOC_CTX *ctx = talloc_tos();
 141
 142         ZERO_STRUCT(xacl);
 143         ZERO_STRUCT(sd_hs3);
 144
 145         xacl.version = 3;
 146         xacl.info.sd_hs3 = &sd_hs3;
 147         xacl.info.sd_hs3->sd = CONST_DISCARD(struct security_descriptor *, psd);
 148         xacl.info.sd_hs3->hash_type = hash_type;
 149         memcpy(&xacl.info.sd_hs3->hash[0], hash, XATTR_SD_HASH_SIZE);
 150
 151         ndr_err = ndr_push_struct_blob(
 152                         pblob, ctx, &xacl,
 153                         (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
 154
 155         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 156                 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
 157                         ndr_errstr(ndr_err)));
 158                 return ndr_map_error2ntstatus(ndr_err);
 159         }
 160
 161         return NT_STATUS_OK;
 162 }
 163
 164 /*******************************************************************
 165  Add in 3 inheritable components for a non-inheritable directory ACL.
 166  CREATOR_OWNER/CREATOR_GROUP/WORLD.
 167 *******************************************************************/
 168
 169 static void add_directory_inheritable_components(vfs_handle_struct *handle,
 170                                 const char *name,
 171                                 SMB_STRUCT_STAT *psbuf,
 172                                 struct security_descriptor *psd)
 173 {
 174         struct connection_struct *conn = handle->conn;
 175         int num_aces = (psd->dacl ? psd->dacl->num_aces : 0);
 176         struct smb_filename smb_fname;
 177         enum security_ace_type acltype;
 178         uint32_t access_mask;
 179         mode_t dir_mode;
 180         mode_t file_mode;
 181         mode_t mode;
 182         struct security_ace *new_ace_list = TALLOC_ZERO_ARRAY(talloc_tos(),
 183                                                 struct security_ace,
 184                                                 num_aces + 3);
 185
 186         if (new_ace_list == NULL) {
 187                 return;
 188         }
 189
 190         /* Fake a quick smb_filename. */
 191         ZERO_STRUCT(smb_fname);
 192         smb_fname.st = *psbuf;
 193         smb_fname.base_name = CONST_DISCARD(char *, name);
 194
 195         dir_mode = unix_mode(conn,
 196                         FILE_ATTRIBUTE_DIRECTORY, &smb_fname, NULL);
 197         file_mode = unix_mode(conn,
 198                         FILE_ATTRIBUTE_ARCHIVE, &smb_fname, NULL);
 199
 200         mode = dir_mode | file_mode;
 201
 202         DEBUG(10, ("add_directory_inheritable_components: directory %s, "
 203                 "mode = 0%o\n",
 204                 name,
 205                 (unsigned int)mode ));
 206
 207         if (num_aces) {
 208                 memcpy(new_ace_list, psd->dacl->aces,
 209                         num_aces * sizeof(struct security_ace));
 210         }
 211         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 212                                 mode & 0700, false);
 213
 214         init_sec_ace(&new_ace_list[num_aces],
 215                         &global_sid_Creator_Owner,
 216                         acltype,
 217                         access_mask,
 218                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 219                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 220                                 SEC_ACE_FLAG_INHERIT_ONLY);
 221         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 222                                 (mode << 3) & 0700, false);
 223         init_sec_ace(&new_ace_list[num_aces+1],
 224                         &global_sid_Creator_Group,
 225                         acltype,
 226                         access_mask,
 227                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 228                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 229                                 SEC_ACE_FLAG_INHERIT_ONLY);
 230         access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
 231                                 (mode << 6) & 0700, false);
 232         init_sec_ace(&new_ace_list[num_aces+2],
 233                         &global_sid_World,
 234                         acltype,
 235                         access_mask,
 236                         SEC_ACE_FLAG_CONTAINER_INHERIT|
 237                                 SEC_ACE_FLAG_OBJECT_INHERIT|
 238                                 SEC_ACE_FLAG_INHERIT_ONLY);
 239         psd->dacl->aces = new_ace_list;
 240         psd->dacl->num_aces += 3;
 241 }
 242
 243 /*******************************************************************
 244  Pull a DATA_BLOB from an xattr given a pathname.
 245  If the hash doesn't match, or doesn't exist - return the underlying
 246  filesystem sd.
 247 *******************************************************************/
 248
 249 static NTSTATUS get_nt_acl_internal(vfs_handle_struct *handle,
 250                                 files_struct *fsp,
 251                                 const char *name,
 252                                 uint32_t security_info,
 253                                 struct security_descriptor **ppdesc)
 254 {
 255         DATA_BLOB blob = data_blob_null;
 256         NTSTATUS status;
 257         uint16_t hash_type = XATTR_SD_HASH_TYPE_NONE;
 258         uint8_t hash[XATTR_SD_HASH_SIZE];
 259         uint8_t hash_tmp[XATTR_SD_HASH_SIZE];
 260         struct security_descriptor *psd = NULL;
 261         struct security_descriptor *pdesc_next = NULL;
 262         bool ignore_file_system_acl = lp_parm_bool(SNUM(handle->conn),
 263                                                 ACL_MODULE_NAME,
 264                                                 "ignore system acls",
 265                                                 false);
 266
 267         if (fsp && name == NULL) {
 268                 name = fsp->fsp_name->base_name;
 269         }
 270
 271         DEBUG(10, ("get_nt_acl_internal: name=%s\n", name));
 272
 273         /* Get the full underlying sd for the hash
 274            or to return as backup. */
 275         if (fsp) {
 276                 status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 277                                 fsp,
 278                                 HASH_SECURITY_INFO,
 279                                 &pdesc_next);
 280         } else {
 281                 status = SMB_VFS_NEXT_GET_NT_ACL(handle,
 282                                 name,
 283                                 HASH_SECURITY_INFO,
 284                                 &pdesc_next);
 285         }
 286
 287         if (!NT_STATUS_IS_OK(status)) {
 288                 DEBUG(10, ("get_nt_acl_internal: get_next_acl for file %s "
 289                         "returned %s\n",
 290                         name,
 291                         nt_errstr(status)));
 292                 return status;
 293         }
 294
 295         status = get_acl_blob(talloc_tos(), handle, fsp, name, &blob);
 296         if (!NT_STATUS_IS_OK(status)) {
 297                 DEBUG(10, ("get_nt_acl_internal: get_acl_blob returned %s\n",
 298                         nt_errstr(status)));
 299                 psd = pdesc_next;
 300                 goto out;
 301         }
 302
 303         status = parse_acl_blob(&blob, &psd,
 304                                 &hash_type, &hash[0]);
 305         if (!NT_STATUS_IS_OK(status)) {
 306                 DEBUG(10, ("parse_acl_blob returned %s\n",
 307                                 nt_errstr(status)));
 308                 psd = pdesc_next;
 309                 goto out;
 310         }
 311
 312         /* Ensure the hash type is one we know. */
 313         switch (hash_type) {
 314                 case XATTR_SD_HASH_TYPE_NONE:
 315                         /* No hash, just return blob sd. */
 316                         goto out;
 317                 case XATTR_SD_HASH_TYPE_SHA256:
 318                         break;
 319                 default:
 320                         DEBUG(10, ("get_nt_acl_internal: ACL blob revision "
 321                                 "mismatch (%u) for file %s\n",
 322                                 (unsigned int)hash_type,
 323                                 name));
 324                         TALLOC_FREE(psd);
 325                         psd = pdesc_next;
 326                         goto out;
 327         }
 328
 329         if (ignore_file_system_acl) {
 330                 goto out;
 331         }
 332
 333         status = hash_sd_sha256(pdesc_next, hash_tmp);
 334         if (!NT_STATUS_IS_OK(status)) {
 335                 TALLOC_FREE(psd);
 336                 psd = pdesc_next;
 337                 goto out;
 338         }
 339
 340         if (memcmp(&hash[0], &hash_tmp[0], XATTR_SD_HASH_SIZE) == 0) {
 341                 /* Hash matches, return blob sd. */
 342                 DEBUG(10, ("get_nt_acl_internal: blob hash "
 343                         "matches for file %s\n",
 344                         name ));
 345                 goto out;
 346         }
 347
 348         /* Hash doesn't match, return underlying sd. */
 349         TALLOC_FREE(psd);
 350         psd = pdesc_next;
 351
 352   out:
 353
 354         if (psd != pdesc_next) {
 355                 /* We're returning the blob, throw
 356                  * away the filesystem SD. */
 357                 TALLOC_FREE(pdesc_next);
 358         } else {
 359                 SMB_STRUCT_STAT sbuf;
 360                 SMB_STRUCT_STAT *psbuf = &sbuf;
 361                 bool is_directory = false;
 362                 /*
 363                  * We're returning the underlying ACL from the
 364                  * filesystem. If it's a directory, and has no
 365                  * inheritable ACE entries we have to fake them.
 366                  */
 367                 if (fsp) {
 368                         status = vfs_stat_fsp(fsp);
 369                         if (!NT_STATUS_IS_OK(status)) {
 370                                 return status;
 371                         }
 372                         psbuf = &fsp->fsp_name->st;
 373                 } else {
 374                         int ret = vfs_stat_smb_fname(handle->conn,
 375                                                 name,
 376                                                 &sbuf);
 377                         if (ret == -1) {
 378                                 return map_nt_error_from_unix(errno);
 379                         }
 380                 }
 381                 is_directory = S_ISDIR(sbuf.st_ex_mode);
 382
 383                 if (ignore_file_system_acl) {
 384                         TALLOC_FREE(pdesc_next);
 385                         status = make_default_filesystem_acl(talloc_tos(),
 386                                                 name,
 387                                                 psbuf,
 388                                                 &psd);
 389                         if (!NT_STATUS_IS_OK(status)) {
 390                                 return status;
 391                         }
 392                 } else {
 393                         if (is_directory &&
 394                                 !sd_has_inheritable_components(psd,
 395                                                         true)) {
 396                                 add_directory_inheritable_components(handle,
 397                                                         name,
 398                                                         psbuf,
 399                                                         psd);
 400                         }
 401                         /* The underlying POSIX module always sets
 402                            the ~SEC_DESC_DACL_PROTECTED bit, as ACLs
 403                            can't be inherited in this way under POSIX.
 404                            Remove it for Windows-style ACLs. */
 405                         psd->type &= ~SEC_DESC_DACL_PROTECTED;
 406                 }
 407         }
 408
 409         if (!(security_info & SECINFO_OWNER)) {
 410                 psd->owner_sid = NULL;
 411         }
 412         if (!(security_info & SECINFO_GROUP)) {
 413                 psd->group_sid = NULL;
 414         }
 415         if (!(security_info & SECINFO_DACL)) {
 416                 psd->dacl = NULL;
 417         }
 418         if (!(security_info & SECINFO_SACL)) {
 419                 psd->sacl = NULL;
 420         }
 421
 422         TALLOC_FREE(blob.data);
 423         *ppdesc = psd;
 424
 425         if (DEBUGLEVEL >= 10) {
 426                 DEBUG(10,("get_nt_acl_internal: returning acl for %s is:\n",
 427                         name ));
 428                 NDR_PRINT_DEBUG(security_descriptor, psd);
 429         }
 430
 431         return NT_STATUS_OK;
 432 }
 433
 434 /*********************************************************************
 435  Create a default ACL by inheriting from the parent. If no inheritance
 436  from the parent available, don't set anything. This will leave the actual
 437  permissions the new file or directory already got from the filesystem
 438  as the NT ACL when read.
 439 *********************************************************************/
 440
 441 static NTSTATUS inherit_new_acl(vfs_handle_struct *handle,
 442                                         files_struct *fsp,
 443                                         struct security_descriptor *parent_desc,
 444                                         bool is_directory)
 445 {
 446         TALLOC_CTX *ctx = talloc_tos();
 447         NTSTATUS status = NT_STATUS_OK;
 448         struct security_descriptor *psd = NULL;
 449         struct dom_sid *owner_sid = NULL;
 450         struct dom_sid *group_sid = NULL;
 451         uint32_t security_info_sent = (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL);
 452         bool inherit_owner = lp_inherit_owner(SNUM(handle->conn));
 453         bool inheritable_components = sd_has_inheritable_components(parent_desc,
 454                                         is_directory);
 455         size_t size;
 456
 457         if (!inheritable_components && !inherit_owner) {
 458                 /* Nothing to inherit and not setting owner. */
 459                 return NT_STATUS_OK;
 460         }
 461
 462         /* Create an inherited descriptor from the parent. */
 463
 464         if (DEBUGLEVEL >= 10) {
 465                 DEBUG(10,("inherit_new_acl: parent acl for %s is:\n",
 466                         fsp_str_dbg(fsp) ));
 467                 NDR_PRINT_DEBUG(security_descriptor, parent_desc);
 468         }
 469
 470         /* Inherit from parent descriptor if "inherit owner" set. */
 471         if (inherit_owner) {
 472                 owner_sid = parent_desc->owner_sid;
 473                 group_sid = parent_desc->group_sid;
 474         }
 475
 476         if (owner_sid == NULL) {
 477                 owner_sid = &handle->conn->session_info->security_token->sids[PRIMARY_USER_SID_INDEX];
 478         }
 479         if (group_sid == NULL) {
 480                 group_sid = &handle->conn->session_info->security_token->sids[PRIMARY_GROUP_SID_INDEX];
 481         }
 482
 483         status = se_create_child_secdesc(ctx,
 484                         &psd,
 485                         &size,
 486                         parent_desc,
 487                         owner_sid,
 488                         group_sid,
 489                         is_directory);
 490         if (!NT_STATUS_IS_OK(status)) {
 491                 return status;
 492         }
 493
 494         /* If inheritable_components == false,
 495            se_create_child_secdesc()
 496            creates a security desriptor with a NULL dacl
 497            entry, but with SEC_DESC_DACL_PRESENT. We need
 498            to remove that flag. */
 499
 500         if (!inheritable_components) {
 501                 security_info_sent &= ~SECINFO_DACL;
 502                 psd->type &= ~SEC_DESC_DACL_PRESENT;
 503         }
 504
 505         if (DEBUGLEVEL >= 10) {
 506                 DEBUG(10,("inherit_new_acl: child acl for %s is:\n",
 507                         fsp_str_dbg(fsp) ));
 508                 NDR_PRINT_DEBUG(security_descriptor, psd);
 509         }
 510
 511         if (inherit_owner) {
 512                 /* We need to be root to force this. */
 513                 become_root();
 514         }
 515         status = SMB_VFS_FSET_NT_ACL(fsp,
 516                                 security_info_sent,
 517                                 psd);
 518         if (inherit_owner) {
 519                 unbecome_root();
 520         }
 521         return status;
 522 }
 523
 524 static NTSTATUS get_parent_acl_common(vfs_handle_struct *handle,
 525                                 const char *path,
 526                                 struct security_descriptor **pp_parent_desc)
 527 {
 528         char *parent_name = NULL;
 529         NTSTATUS status;
 530
 531         if (!parent_dirname(talloc_tos(), path, &parent_name, NULL)) {
 532                 return NT_STATUS_NO_MEMORY;
 533         }
 534
 535         status = get_nt_acl_internal(handle,
 536                                         NULL,
 537                                         parent_name,
 538                                         (SECINFO_OWNER |
 539                                          SECINFO_GROUP |
 540                                          SECINFO_DACL),
 541                                         pp_parent_desc);
 542
 543         if (!NT_STATUS_IS_OK(status)) {
 544                 DEBUG(10,("get_parent_acl_common: get_nt_acl_internal "
 545                         "on directory %s for "
 546                         "path %s returned %s\n",
 547                         parent_name,
 548                         path,
 549                         nt_errstr(status) ));
 550         }
 551         return status;
 552 }
 553
 554 static NTSTATUS check_parent_acl_common(vfs_handle_struct *handle,
 555                                 const char *path,
 556                                 uint32_t access_mask,
 557                                 struct security_descriptor **pp_parent_desc)
 558 {
 559         char *parent_name = NULL;
 560         struct security_descriptor *parent_desc = NULL;
 561         uint32_t access_granted = 0;
 562         NTSTATUS status;
 563
 564         status = get_parent_acl_common(handle, path, &parent_desc);
 565         if (!NT_STATUS_IS_OK(status)) {
 566                 return status;
 567         }
 568         if (pp_parent_desc) {
 569                 *pp_parent_desc = parent_desc;
 570         }
 571         status = smb1_file_se_access_check(handle->conn,
 572                                         parent_desc,
 573                                         get_current_nttok(handle->conn),
 574                                         access_mask,
 575                                         &access_granted);
 576         if(!NT_STATUS_IS_OK(status)) {
 577                 DEBUG(10,("check_parent_acl_common: access check "
 578                         "on directory %s for "
 579                         "path %s for mask 0x%x returned %s\n",
 580                         parent_name,
 581                         path,
 582                         access_mask,
 583                         nt_errstr(status) ));
 584                 return status;
 585         }
 586         return NT_STATUS_OK;
 587 }
 588
 589 /*********************************************************************
 590  Check ACL on open. For new files inherit from parent directory.
 591 *********************************************************************/
 592
 593 static int open_acl_common(vfs_handle_struct *handle,
 594                         struct smb_filename *smb_fname,
 595                         files_struct *fsp,
 596                         int flags,
 597                         mode_t mode)
 598 {
 599         uint32_t access_granted = 0;
 600         struct security_descriptor *pdesc = NULL;
 601         bool file_existed = true;
 602         char *fname = NULL;
 603         NTSTATUS status;
 604
 605         if (fsp->base_fsp) {
 606                 /* Stream open. Base filename open already did the ACL check. */
 607                 DEBUG(10,("open_acl_common: stream open on %s\n",
 608                         fsp_str_dbg(fsp) ));
 609                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 610         }
 611
 612         status = get_full_smb_filename(talloc_tos(), smb_fname,
 613                                        &fname);
 614         if (!NT_STATUS_IS_OK(status)) {
 615                 goto err;
 616         }
 617
 618         status = get_nt_acl_internal(handle,
 619                                 NULL,
 620                                 fname,
 621                                 (SECINFO_OWNER |
 622                                  SECINFO_GROUP |
 623                                  SECINFO_DACL),
 624                                 &pdesc);
 625         if (NT_STATUS_IS_OK(status)) {
 626                 /* See if we can access it. */
 627                 status = smb1_file_se_access_check(handle->conn,
 628                                         pdesc,
 629                                         get_current_nttok(handle->conn),
 630                                         fsp->access_mask,
 631                                         &access_granted);
 632                 if (!NT_STATUS_IS_OK(status)) {
 633                         DEBUG(10,("open_acl_xattr: %s open "
 634                                 "refused with error %s\n",
 635                                 fsp_str_dbg(fsp),
 636                                 nt_errstr(status) ));
 637                         goto err;
 638                 }
 639         } else if (NT_STATUS_EQUAL(status,NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 640                 file_existed = false;
 641                 /*
 642                  * If O_CREAT is true then we're trying to create a file.
 643                  * Check the parent directory ACL will allow this.
 644                  */
 645                 if (flags & O_CREAT) {
 646                         struct security_descriptor *parent_desc = NULL;
 647                         struct security_descriptor **pp_psd = NULL;
 648
 649                         status = check_parent_acl_common(handle, fname,
 650                                         SEC_DIR_ADD_FILE, &parent_desc);
 651                         if (!NT_STATUS_IS_OK(status)) {
 652                                 goto err;
 653                         }
 654
 655                         /* Cache the parent security descriptor for
 656                          * later use. */
 657
 658                         pp_psd = VFS_ADD_FSP_EXTENSION(handle,
 659                                         fsp,
 660                                         struct security_descriptor *,
 661                                         NULL);
 662                         if (!pp_psd) {
 663                                 status = NT_STATUS_NO_MEMORY;
 664                                 goto err;
 665                         }
 666
 667                         *pp_psd = parent_desc;
 668                         status = NT_STATUS_OK;
 669                 }
 670         }
 671
 672         DEBUG(10,("open_acl_xattr: get_nt_acl_attr_internal for "
 673                 "%s returned %s\n",
 674                 fsp_str_dbg(fsp),
 675                 nt_errstr(status) ));
 676
 677         fsp->fh->fd = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 678         return fsp->fh->fd;
 679
 680   err:
 681
 682         errno = map_errno_from_nt_status(status);
 683         return -1;
 684 }
 685
 686 static int mkdir_acl_common(vfs_handle_struct *handle, const char *path, mode_t mode)
 687 {
 688         int ret;
 689         NTSTATUS status;
 690         SMB_STRUCT_STAT sbuf;
 691
 692         ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
 693         if (ret == -1 && errno == ENOENT) {
 694                 /* We're creating a new directory. */
 695                 status = check_parent_acl_common(handle, path,
 696                                 SEC_DIR_ADD_SUBDIR, NULL);
 697                 if (!NT_STATUS_IS_OK(status)) {
 698                         errno = map_errno_from_nt_status(status);
 699                         return -1;
 700                 }
 701         }
 702
 703         return SMB_VFS_NEXT_MKDIR(handle, path, mode);
 704 }
 705
 706 /*********************************************************************
 707  Fetch a security descriptor given an fsp.
 708 *********************************************************************/
 709
 710 static NTSTATUS fget_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
 711         uint32_t security_info, struct security_descriptor **ppdesc)
 712 {
 713         return get_nt_acl_internal(handle, fsp,
 714                                 NULL, security_info, ppdesc);
 715 }
 716
 717 /*********************************************************************
 718  Fetch a security descriptor given a pathname.
 719 *********************************************************************/
 720
 721 static NTSTATUS get_nt_acl_common(vfs_handle_struct *handle,
 722         const char *name, uint32_t security_info, struct security_descriptor **ppdesc)
 723 {
 724         return get_nt_acl_internal(handle, NULL,
 725                                 name, security_info, ppdesc);
 726 }
 727
 728 /*********************************************************************
 729  Store a security descriptor given an fsp.
 730 *********************************************************************/
 731
 732 static NTSTATUS fset_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
 733         uint32_t security_info_sent, const struct security_descriptor *orig_psd)
 734 {
 735         NTSTATUS status;
 736         DATA_BLOB blob;
 737         struct security_descriptor *pdesc_next = NULL;
 738         struct security_descriptor *psd = NULL;
 739         uint8_t hash[XATTR_SD_HASH_SIZE];
 740
 741         if (DEBUGLEVEL >= 10) {
 742                 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
 743                           fsp_str_dbg(fsp)));
 744                 NDR_PRINT_DEBUG(security_descriptor,
 745                         CONST_DISCARD(struct security_descriptor *,orig_psd));
 746         }
 747
 748         status = get_nt_acl_internal(handle, fsp,
 749                         NULL,
 750                         SECINFO_OWNER|SECINFO_GROUP|SECINFO_DACL|SECINFO_SACL,
 751                         &psd);
 752
 753         if (!NT_STATUS_IS_OK(status)) {
 754                 return status;
 755         }
 756
 757         psd->revision = orig_psd->revision;
 758         /* All our SD's are self relative. */
 759         psd->type = orig_psd->type | SEC_DESC_SELF_RELATIVE;
 760
 761         if ((security_info_sent & SECINFO_OWNER) && (orig_psd->owner_sid != NULL)) {
 762                 psd->owner_sid = orig_psd->owner_sid;
 763         }
 764         if ((security_info_sent & SECINFO_GROUP) && (orig_psd->group_sid != NULL)) {
 765                 psd->group_sid = orig_psd->group_sid;
 766         }
 767         if (security_info_sent & SECINFO_DACL) {
 768                 psd->dacl = orig_psd->dacl;
 769                 psd->type |= SEC_DESC_DACL_PRESENT;
 770         }
 771         if (security_info_sent & SECINFO_SACL) {
 772                 psd->sacl = orig_psd->sacl;
 773                 psd->type |= SEC_DESC_SACL_PRESENT;
 774         }
 775
 776         status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
 777         if (!NT_STATUS_IS_OK(status)) {
 778                 return status;
 779         }
 780
 781         /* Get the full underlying sd, then hash. */
 782         status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
 783                                 fsp,
 784                                 HASH_SECURITY_INFO,
 785                                 &pdesc_next);
 786
 787         if (!NT_STATUS_IS_OK(status)) {
 788                 return status;
 789         }
 790
 791         status = hash_sd_sha256(pdesc_next, hash);
 792         if (!NT_STATUS_IS_OK(status)) {
 793                 return status;
 794         }
 795
 796         if (DEBUGLEVEL >= 10) {
 797                 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
 798                           fsp_str_dbg(fsp)));
 799                 NDR_PRINT_DEBUG(security_descriptor,
 800                         CONST_DISCARD(struct security_descriptor *,psd));
 801         }
 802         create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
 803         store_acl_blob_fsp(handle, fsp, &blob);
 804
 805         return NT_STATUS_OK;
 806 }
 807
 808 static SMB_STRUCT_DIR *opendir_acl_common(vfs_handle_struct *handle,
 809                         const char *fname, const char *mask, uint32 attr)
 810 {
 811         NTSTATUS status = check_parent_acl_common(handle, fname,
 812                                         SEC_DIR_LIST, NULL);
 813
 814         if (!NT_STATUS_IS_OK(status)) {
 815                 errno = map_errno_from_nt_status(status);
 816                 return NULL;
 817         }
 818         return SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);
 819 }
 820
 821 static int acl_common_remove_object(vfs_handle_struct *handle,
 822                                         const char *path,
 823                                         bool is_directory)
 824 {
 825         connection_struct *conn = handle->conn;
 826         struct file_id id;
 827         files_struct *fsp = NULL;
 828         int ret = 0;
 829         char *parent_dir = NULL;
 830         const char *final_component = NULL;
 831         struct smb_filename local_fname;
 832         int saved_errno = 0;
 833         char *saved_dir = NULL;
 834
 835         saved_dir = vfs_GetWd(talloc_tos(),conn);
 836         if (!saved_dir) {
 837                 saved_errno = errno;
 838                 goto out;
 839         }
 840
 841         if (!parent_dirname(talloc_tos(), path,
 842                         &parent_dir, &final_component)) {
 843                 saved_errno = ENOMEM;
 844                 goto out;
 845         }
 846
 847         DEBUG(10,("acl_common_remove_object: removing %s %s/%s\n",
 848                 is_directory ? "directory" : "file",
 849                 parent_dir, final_component ));
 850
 851         /* cd into the parent dir to pin it. */
 852         ret = vfs_ChDir(conn, parent_dir);
 853         if (ret == -1) {
 854                 saved_errno = errno;
 855                 goto out;
 856         }
 857
 858         ZERO_STRUCT(local_fname);
 859         local_fname.base_name = CONST_DISCARD(char *,final_component);
 860
 861         /* Must use lstat here. */
 862         ret = SMB_VFS_LSTAT(conn, &local_fname);
 863         if (ret == -1) {
 864                 saved_errno = errno;
 865                 goto out;
 866         }
 867
 868         /* Ensure we have this file open with DELETE access. */
 869         id = vfs_file_id_from_sbuf(conn, &local_fname.st);
 870         for (fsp = file_find_di_first(conn->sconn, id); fsp;
 871                      fsp = file_find_di_next(fsp)) {
 872                 if (fsp->access_mask & DELETE_ACCESS &&
 873                                 fsp->delete_on_close) {
 874                         /* We did open this for delete,
 875                          * allow the delete as root.
 876                          */
 877                         break;
 878                 }
 879         }
 880
 881         if (!fsp) {
 882                 DEBUG(10,("acl_common_remove_object: %s %s/%s "
 883                         "not an open file\n",
 884                         is_directory ? "directory" : "file",
 885                         parent_dir, final_component ));
 886                 saved_errno = EACCES;
 887                 goto out;
 888         }
 889
 890         become_root();
 891         if (is_directory) {
 892                 ret = SMB_VFS_NEXT_RMDIR(handle, final_component);
 893         } else {
 894                 ret = SMB_VFS_NEXT_UNLINK(handle, &local_fname);
 895         }
 896         unbecome_root();
 897
 898         if (ret == -1) {
 899                 saved_errno = errno;
 900         }
 901
 902   out:
 903
 904         TALLOC_FREE(parent_dir);
 905
 906         if (saved_dir) {
 907                 vfs_ChDir(conn, saved_dir);
 908         }
 909         if (saved_errno) {
 910                 errno = saved_errno;
 911         }
 912         return ret;
 913 }
 914
 915 static int rmdir_acl_common(struct vfs_handle_struct *handle,
 916                                 const char *path)
 917 {
 918         int ret;
 919
 920         ret = SMB_VFS_NEXT_RMDIR(handle, path);
 921         if (!(ret == -1 && (errno == EACCES || errno == EPERM))) {
 922                 DEBUG(10,("rmdir_acl_common: unlink of %s failed %s\n",
 923                         path,
 924                         strerror(errno) ));
 925                 return ret;
 926         }
 927
 928         return acl_common_remove_object(handle,
 929                                         path,
 930                                         true);
 931 }
 932
 933 static NTSTATUS create_file_acl_common(struct vfs_handle_struct *handle,
 934                                 struct smb_request *req,
 935                                 uint16_t root_dir_fid,
 936                                 struct smb_filename *smb_fname,
 937                                 uint32_t access_mask,
 938                                 uint32_t share_access,
 939                                 uint32_t create_disposition,
 940                                 uint32_t create_options,
 941                                 uint32_t file_attributes,
 942                                 uint32_t oplock_request,
 943                                 uint64_t allocation_size,
 944                                 uint32_t private_flags,
 945                                 struct security_descriptor *sd,
 946                                 struct ea_list *ea_list,
 947                                 files_struct **result,
 948                                 int *pinfo)
 949 {
 950         NTSTATUS status, status1;
 951         files_struct *fsp = NULL;
 952         int info;
 953         struct security_descriptor *parent_sd = NULL;
 954         struct security_descriptor **pp_parent_sd = NULL;
 955
 956         status = SMB_VFS_NEXT_CREATE_FILE(handle,
 957                                         req,
 958                                         root_dir_fid,
 959                                         smb_fname,
 960                                         access_mask,
 961                                         share_access,
 962                                         create_disposition,
 963                                         create_options,
 964                                         file_attributes,
 965                                         oplock_request,
 966                                         allocation_size,
 967                                         private_flags,
 968                                         sd,
 969                                         ea_list,
 970                                         result,
 971                                         &info);
 972
 973         if (!NT_STATUS_IS_OK(status)) {
 974                 goto out;
 975         }
 976
 977         if (info != FILE_WAS_CREATED) {
 978                 /* File/directory was opened, not created. */
 979                 goto out;
 980         }
 981
 982         fsp = *result;
 983
 984         if (fsp == NULL) {
 985                 /* Only handle success. */
 986                 goto out;
 987         }
 988
 989         if (sd) {
 990                 /* Security descriptor already set. */
 991                 goto out;
 992         }
 993
 994         if (fsp->base_fsp) {
 995                 /* Stream open. */
 996                 goto out;
 997         }
 998
 999         /* See if we have a cached parent sd, if so, use it. */
1000         pp_parent_sd = (struct security_descriptor **)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1001         if (!pp_parent_sd) {
1002                 /* Must be a directory, fetch again (sigh). */
1003                 status = get_parent_acl_common(handle,
1004                                 fsp->fsp_name->base_name,
1005                                 &parent_sd);
1006                 if (!NT_STATUS_IS_OK(status)) {
1007                         goto out;
1008                 }
1009         } else {
1010                 parent_sd = *pp_parent_sd;
1011         }
1012
1013         if (!parent_sd) {
1014                 goto err;
1015         }
1016
1017         /* New directory - inherit from parent. */
1018         status1 = inherit_new_acl(handle, fsp, parent_sd, fsp->is_directory);
1019
1020         if (!NT_STATUS_IS_OK(status1)) {
1021                 DEBUG(1,("create_file_acl_common: error setting "
1022                         "sd for %s (%s)\n",
1023                         fsp_str_dbg(fsp),
1024                         nt_errstr(status1) ));
1025         }
1026
1027   out:
1028
1029         if (fsp) {
1030                 VFS_REMOVE_FSP_EXTENSION(handle, fsp);
1031         }
1032
1033         if (NT_STATUS_IS_OK(status) && pinfo) {
1034                 *pinfo = info;
1035         }
1036         return status;
1037
1038   err:
1039
1040         smb_panic("create_file_acl_common: logic error.\n");
1041         /* NOTREACHED */
1042         return status;
1043 }
1044
1045 static int unlink_acl_common(struct vfs_handle_struct *handle,
1046                         const struct smb_filename *smb_fname)
1047 {
1048         int ret;
1049
1050         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
1051         if (!(ret == -1 && (errno == EACCES || errno == EPERM))) {
1052                 DEBUG(10,("unlink_acl_common: unlink of %s failed %s\n",
1053                         smb_fname->base_name,
1054                         strerror(errno) ));
1055                 return ret;
1056         }
1057         /* Don't do anything fancy for streams. */
1058         if (smb_fname->stream_name) {
1059                 return ret;
1060         }
1061
1062         return acl_common_remove_object(handle,
1063                                         smb_fname->base_name,
1064                                         false);
1065 }
1066
1067 static int chmod_acl_module_common(struct vfs_handle_struct *handle,
1068                         const char *path, mode_t mode)
1069 {
1070         if (lp_posix_pathnames()) {
1071                 /* Only allow this on POSIX pathnames. */
1072                 return SMB_VFS_NEXT_CHMOD(handle, path, mode);
1073         }
1074         return 0;
1075 }
1076
1077 static int fchmod_acl_module_common(struct vfs_handle_struct *handle,
1078                         struct files_struct *fsp, mode_t mode)
1079 {
1080         if (fsp->posix_open) {
1081                 /* Only allow this on POSIX opens. */
1082                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1083         }
1084         return 0;
1085 }
1086
1087 static int chmod_acl_acl_module_common(struct vfs_handle_struct *handle,
1088                         const char *name, mode_t mode)
1089 {
1090         if (lp_posix_pathnames()) {
1091                 /* Only allow this on POSIX pathnames. */
1092                 return SMB_VFS_NEXT_CHMOD_ACL(handle, name, mode);
1093         }
1094         return 0;
1095 }
1096
1097 static int fchmod_acl_acl_module_common(struct vfs_handle_struct *handle,
1098                         struct files_struct *fsp, mode_t mode)
1099 {
1100         if (fsp->posix_open) {
1101                 /* Only allow this on POSIX opens. */
1102                 return SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);
1103         }
1104         return 0;
1105 }